Rabbit Core RCM3700 User Manual

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RabbitCore RCM3700

with Ethernet, Serial Flash, and Enhanced Software

C-Programmable Core Module

User’s Manual

019–0136_L

RabbitCore RCM3700 User’s Manual

Part Number 019-0136_L • Printed in U.S.A.

Digi International reserves the right to make changes and

improvements to its products without providing notice.

T rademarks

Rabbit, RabbitCore, and Dynamic C are registered trademarks of Digi International Inc.

Rabbit 3000 is a trademark of Digi International I nc.

The latest revision of this manual is available on the Rabbit Web site, www.rabbit.com, for free, unregistered download.

Rabbit Semiconductor Inc.

www .rabbi t.com

RabbitCore RCM3700

TABLE OF CONTENTS

Chapter 1. Introduction 4

1.1 RCM3700 Features................................. ..............................................................................................4

1.2 Advantages of the RCM3700 ...............................................................................................................6

1.3 Development and Evaluation Tools......................................................................................................7

1.3.1 Development Kit...........................................................................................................................7

1.3.2 Software........................................................................................................................................8

1.3.3 Application Kits............................................................................................................................8

1.3.4 Online Documentation............................................. ................................................ .....................8

Chapter 2. Getting Started 9

2.1 Step 1 — Install Dynamic C...................................... ...........................................................................9

2.2 Hardware Connections........................................................................................................................10

2.2.1 Step 1 — Attach Module to Prototyping Board..........................................................................10

2.2.2 Step 2 — Connect Programming Cable......................................................................................11

2.2.3 Step 3 — Connect Power............................................................................................................12

2.2.3.1 Overseas Development Kits................................ ... ................................................ .. .......... 12

2.3 Starting Dynamic C ............................................................................................................................13

2.4 Run a Sample Program.......................................................................................................................13

2.4.1 Troubleshooting ..........................................................................................................................13

2.5 Where Do I Go From Here? ...............................................................................................................14

2.5.1 Technical Support.......................................................................................................................14

Chapter 3. Running Sample Programs 15

3.1 Introduction.........................................................................................................................................15

3.2 Sample Programs................................................................................................................................17

3.2.1 Use of Serial Flash......................................................................................................................19

3.2.2 Serial Communication.................................................................................................................19

3.2.3 A/D Converter Inputs..................................................................................................................22

Chapter 4. Hardware Reference 25

4.1 RCM3700 Digital Inputs and Outputs................................................................................................26

4.1.1 Memory I/O Interface .................................................................................................................30

4.1.2 Other Inputs and Outputs............................................................................................... .............30

4.2 Serial Communication ........................................................................................................................31

4.2.1 Serial Ports..................................................................................................................................31

4.2.2 Ethernet Port ................................................................................... ............................................32

4.2.3 Serial Programming Port.............................................................................................................33

4.3 Serial Programming Cable..................................................................................................................34

4.3.1 Changing Between Program Mode and Run Mode....................................................................34

4.3.2 Standalone Operation of the RCM3700......................................................................................35

4.4 Other Hardware............................................... ....................................................................................36

4.4.1 Clock Doubler.............................................................................................................................36

4.4.2 Spectrum Spreader........................................... .. .........................................................................36

RabbitCore RCM3700 User’s Manual 1

4.5 Memory...............................................................................................................................................37

4.5.1 SRAM .........................................................................................................................................37

4.5.2 Flash EPROM.............................................................................................................................37

4.5.3 Serial Flash..................................................................................................................................37

4.5.4 Dynamic C BIOS Source Files ...................................................................................................37

Chapter 5. Software Reference 38

5.1 More About Dynamic C .....................................................................................................................38

5.2 Dynamic C Functions .........................................................................................................................40

5.2.1 Board Initialization .....................................................................................................................41

5.2.2 Analog Inputs.............................................................. ................................................................42

5.2.3 Digital I/O...................................................................................................................................58

5.2.4 Serial Communication Drivers....................................................................................................59

5.2.5 Serial Flash..................................................................................................................................59

5.2.6 TCP/IP Drivers............................................................................................................................59

5.3 Upgrading Dynamic C.................................... ....................................................................................60

5.3.1 Extras ..........................................................................................................................................60

5.3.1.1 Featured Application Kit.................................................................................................... 60

Chapter 6. Using the TCP/IP Features 61

6.1 TCP/IP Connections ...........................................................................................................................61

6.2 TCP/IP Primer on IP Addresses..........................................................................................................63

6.2.1 IP Addresses Explained ..............................................................................................................65

6.2.2 How IP Addresses are Used........................................................................................................66

6.2.3 Dynamically Assigned Internet Addresses .................................................................................67

6.3 Placing Your Device on the Network.................................................................................................68

6.4 Running TCP/IP Sample Programs ....................................................................................................69

6.4.1 How to Set IP Addresses in the Sample Programs .....................................................................70

6.4.2 How to Set Up your Computer for Direct Connect ....................................................................71

6.5 Run the PINGME.C Sample Program................................................................................................72

6.6 Running Additional Sample Programs With Direct Connect.............................................................72

6.6.1 RabbitWeb Sample Programs.....................................................................................................73

6.6.2 Secure Sockets Layer (SSL) Sample Programs ..........................................................................74

6.6.3 Dynamic C FAT File System, RabbitWeb, and SSL Modules...................................................74

6.7 Where Do I Go From Here? ...............................................................................................................76

Appendix A. RCM3700 Specifications 77

A.1 Electrical and Mechanical Characteristics.........................................................................................78

A.1.1 Headers.......................................................................................................................................81

A.2 Bus Loading............................... ................................................ ........................................................82

A.3 Rabbit 3000 DC Characteristics.........................................................................................................85

A.4 I/O Buffer Sourcing and Sinking Limit .............................................................................................86

A.5 Conformal Coating.............................................................................................................................87

A.6 Jumper Configurations.................................................... ...................................................................88

Appendix B. Prototyping Board 90

B.1 RCM3700 Prototyping Board ............................................................. ...............................................91

B.1.1 Features .................................... ..................................................................................................92

B.1.2 Mechanical Dimensions and Layout..........................................................................................94

B.1.3 Power Supply ...................................... .......................................................................................95

B.1.4 Using the RCM3700 Prototyping Board....................................................................................96

B.1.4.1 Adding Other Components....................................................... ......................................... 97

B.1.5 Analog Features....................................................... ................................................ .. .................98

B.1.5.1 A/D Converter Inputs ........................................................................................................ 98

B.1.5.2 Thermistor Input.............................................................................................................. 100

B.1.5.3 Other A/D Converter Features......................................................................................... 101

B.1.5.4 A/D Converter Calibration .............................................................................................. 102

RabbitCore RCM3700 User’s Manual 2

B.1.6 Serial Communication.............. ................................................ ................................................103

B.1.6.1 RS-232...................... ....................................................................................................... 104

B.1.6.2 RS-485...................... ....................................................................................................... 105

B.1.7 Other Prototyping Board Modules ...........................................................................................107

B.1.8 Jumper Configurations .............................................................................................................108

B.1.9 Use of Rabbit 3000 Parallel Ports ............................................................................................110

B.2 RCM3720 Prototyping Board ............................................................. .............................................112

B.2.1 Features .................................... ................................................................................................113

B.2.2 Mechanical Dimensions and Layout........................................................................................114

B.2.3 Power Supply ...................................... .....................................................................................115

B.2.4 Using the RCM3720 Prototyping Board..................................................................................116

B.2.4.1 Prototyping Area...................................... ........................................................................ 118

B.2.5 Serial Communication.............. ................................................ ................................................119

B.2.6 Use of Rabbit 3000 Parallel Ports ............................................................................................121

Appendix C. LCD/Keypad Module 123

C.1 Specifications...................................................................................................................................123

C.2 Contrast Adjustments for All Boards................................................................... ............................125

C.3 Keypad Labeling..............................................................................................................................126

C.4 Header Pinouts.................................................................................................................................127

C.4.1 I/O Address Assignments.........................................................................................................127

C.5 Install Connectors on Prototyping Board..................... ....................................................................128

C.6 Mounting LCD/Keypad Module on the Prototyping Board ............................................................129

C.7 Bezel-Mount Installation..................................................................................................................130

C.7.1 Connect the LCD/Keypad Module to Your Prototyping Board...............................................132

C.8 Sample Programs .............................................................................................................................133

C.9 LCD/Keypad Module Function Calls .......................... ................................................ ....................134

C.9.1 LCD/Keypad Module Initialization............................................. .............................................134

C.9.2 LEDs.................................................................................................... .....................................134

C.9.3 LCD Display.............................................................................................................................135

C.9.4 Keypad......................................... ................................................ .............................................155

Appendix D. Power Supply 158

D.1 Power Supplies.................................................................................................................................158

D.1.1 Battery Backup................................................................................. ........................................159

D.1.2 Battery-Backup Circuit ............................................................................................................160

D.1.3 Reset Generator........................................................................................................................160

Appendix E. Secure Embedded Web Application Kit 161

E.1 Sample Programs.................................................................................................. ............................162

E.2 Module Documentation....................................................................................................................162

Index 163

Schematics 167

RabbitCore RCM3700 User’s Manual 3

1. INTRODUCTION

The RCM3700 is a compact module that incorporates the latest

revision of the powerful Rabbit memory, onboard serial flash, static RAM, and digital I/O ports.

Throughout this manual, the term RCM3700 refers to the complete series of RCM3700 RabbitCore modules unless other production models are referred to specifically.

The RCM3700 has a Rabbit 3000 microprocessor operating at 22.1 MHz, static RAM, flash memory , two clocks (main oscillator and real-time clock), and the circuitry necessary for reset and management of battery backup of the Rabbit 3000’s internal real-time clock and the static RAM. One 40-pin header brings out the Rabbit 3000 I/O bus lines, parallel ports, and serial ports.

The RCM3700 receives its +5 V power from the customer-supplied motherboard on which it is mounted. The RCM3700 can interface with all kinds of CMOS-compatible digital devices through the motherboard.

3000 microprocessor, flash

The Development Kit and the Ethernet Connection Kit have what you need to design your own microprocessor-based system: a complete Dynamic C software development system with optional modules and a Prototyping Board that acts as a motherboard to allow you to evaluate the RCM3700 and to prototype circuits that interface to the RCM3700 module.

1.1 RCM3700 Features

• Small size: 1.20" x 2.95" x 0.98" (30 mm x 75 mm x 25 mm)

• Microprocessor: latest revision of Rabbit 3000 running Secure Sockets Layer (SSL) module for added security

• 33 parallel 5 V tolerant I/O lines: 31 configurable for I/O, 2 fixed outputs

• External reset I/O

• Alternate I/O bus can be configured for 8 data lines and 5 address lines (shared with

parallel I/O lines), I/O read/write

• Ten 8-bit timers (six cascadable) and one 10-bit timer with two match registers

• 512K flash memory and 512K SRAM (options for 256K flash memory and 128K SRAM)

at 22.1 MHz supports Dynamic C

RabbitCore RCM3700 User’s Manual 4

• 1 Mbyte serial flash memory , which is required to run the optional Dynamic C FAT file system

• Real-time clock

• Watchdog supervisor

• Provision for customer-supplied backup battery via connections on header J1

• 10-bit free-running PWM counter and four pulse-width registers

• Two-channel Input Capture can be used to time input signals from various port pins

• Two-channel Quadrature Decoder accepts inputs from external incremental encoder

modules

•

Four available 3.3 V CMOS-compatible serial ports: maximum asynchronous baud rate of 2.76 Mbps

. Three ports are configurable as a clocked serial port (SPI), and one port is configurable as an HDLC serial port. Shared connections to the Rabbit microprocessor make a second HDLC serial port available at the expense of two of the SPI configurable ports, giving you two HDLC ports and one asynchronous/SPI serial port.

• Supports 1.15 Mbps IrDA transceiver There are three RCM3700 production models. Table 1 below summarizes their main

features.

Table 1. RCM3700 Features

Feature RCM3700 RCM3710 RCM3720

Microprocessor

Flash Memory 512K 256K 512K SRAM 512K128K256K Serial Flash Memory 1 Mbyte

4 shared high-speed, 3.3 V CMOS-compatible ports:

all 4 are configurable as asynchronous serial ports;

Serial Ports

3 are configurable as a clocked serial port (SPI) and 1 is configurable as an HDLC serial port; option for second HDLC serial port at the expense of 2 clocked serial ports (SPI)

Rabbit 3000

running at 22.1 MHz

The RCM3700 is programmed over a standard PC serial port through a programming cable supplied with the Development Kit or the Ethernet Connection Kit, and can also be programed through a USB port with an RS-232/USB converter or over an Ethernet with the RabbitLink (both available from Rabbit).

Mounting holes were introduced on opposite corners of the RCM3700 in 2009. Appendix A provides detailed specifications for the RCM3700.

RabbitCore RCM3700 User’s Manual 5

1.2 Advantages of the RCM3700

• Fast time to market using a fully engineered, “ready-to-run/ready-to-program” microprocessor core.

• Competitive pricing when compared with the alternative of purchasing and assembling individual components.

• Easy C-language program development and debugging

• Rabbit Field Utility to download compiled Dynamic C .bin files, and cloning board

options for rapid production loading of programs.

• Generous memory size allows large programs with tens of thousands of lines of code, and substantial data storage.

• Integrated Ethernet port for network connectivity, with royalty-free TCP/IP software.

• Ideal for network-enabling security and access systems, home automation, HVAC

systems, and industrial controls

RabbitCore RCM3700 User’s Manual 6

1.3 Development and Evaluation Tools

Rabbit and Dynamic C are registered trademarks of Digi International Inc.

RabbitCore RCM3700

The RCM3700 RabbitCore module features built-in built-in Ethernet and onboard mass storage (serial flash) in addition to 33 I/O lines. These Getting Started instructions included with the Development Kit will help you get your RCM3700 up and running so that you can run the sample programs to explore its capabilities and develop your own applications.

Development Kit Contents

The RCM3700 Development Kit contains the following items:

RCM3700 module.

Prototyping Board.

Universal AC adapter, 12 V DC, 1 A (includes Canada/Japan/U.S., Australia/N.Z., U.K., and European style plugs).

Programming cable with 10-pin header and DB9 connections, and integrated level-matching circuitry.

Cable kits to access RS-485 and analog input connectors on Prototyping Board.

Dynamic C CD-ROM, with complete product documentation on disk.

Getting Started instructions.

Accessory parts for use on the Prototyping Board.

Rabbit 3000 Processor Easy Reference poster.

Registration card.

Visit our online Rabbit store at www.rabbit.com/store/ for the latest information on peripherals and accessories that are available for the RCM3700 RabbitCore modules.

Step 1 — Install Dynamic C

Before doing any development, you must install Dynamic C. Insert the CD from the Development Kit in your PC’s CD-ROM drive. If the installation does not auto-start, run the setup .exe program in the root directory of the Dynamic C CD. Install any Dynamic C modules after you install Dynamic C

1.3.1 Development Kit

The Development Kit contains the hardware and software needed to use the RCM3700.

• RCM3700 module.

• RCM3700 Prototyping Board.

• Universal AC adapter, 12 V DC, 1 A (includes Canada/Japan/U.S., Australia/N.Z.,

U.K., and European style plugs).

• Programming cable with 10-pin header and DE9 connections, and integrated levelmatching circuitry.

• Cable kits to access RS-485 and analog input connectors on Prototyping Board.

• Dynamic C CD-ROM, with complete product documentation on disk.

• Getting Started instructions.

• Accessory parts for use on the Prototyping Board.

• Rabbit 3000 Processor Easy Reference poster.

• Registration card.

RabbitCore RCM3700 User’s Manual 7

Figure 1. RCM3700 Development Kit

1.3.2 Software

The RCM3700 is programmed using version 8.11 or later of Dynamic C. Dynamic C v . 9.60 includes the popular µC/OS-II real-time operating system, point-to-point protocol (PPP), FAT file system, RabbitWeb, and other select libraries that were previously sold as indidual Dynamic C modules.

Rabbit also offers for purchase the Rabbit Embedded Security Pack featuring the Secure Sockets Layer (SSL) and a specific Advanced Encryption Standard (AES) library. In addition to the Web-based technical support included at no extra charge, a one-year telephonebased technical support subscription is also available for purchase. Visit our Web site at

www.rabbit.com for further information and complete documentation, or contact your

Rabbit sales representative or authorized distributor.

1.3.3 Application Kits

Rabbit also has application kits featuring the RCM3700 to provide the exact software and other tools that will enable to tailor your RCM3700 for specific applications.

• Secure Embedded W eb Application Kit (Ra bbit Part No. 101-0898)—comes with three CD-ROMs that have the Dynamic C RabbitWeb, FAT File System, and Secure Sockets Layer (SSL) modules, and includes Dynamic C 8.51 or a later version and an RCM3700. This enhanced software bundle facilitates the rapid development of secure Web browser interfaces for embedded system control. Appendix E provides additional information about the Secure Embedded Web Application Kit.

• Ethernet Connection Kit (Rabbit Part No. 101-0964)—comes with one CD-ROM that includes Dynamic C 9.01 or a later version, an RCM3720 module, and an RCM3720 Prototyping Board. This kit is intended to demonstrate and help you develop Ethernetbased applications.

V isit our Web site at www.rabbit.com or contact your Rabbit sales representative or authorized distributor for further information.

1.3.4 Online Documentation

The online documentation is installed along with Dynamic C, and an icon for the documentation menu is placed on the workstation’ s desktop. Double-click this icon to reach the menu. If the icon is missing, use your browser to find and load default.htm in the docs folder, found in the Dynamic C installation folder.

Each Dynamic C module has complete documentation available with the online documentation described above.

The latest versions of all documents are always available for free, unregistered download from our Web sites as well.

RabbitCore RCM3700 User’s Manual 8

2. GETTING STARTED

This chapter describes the RCM3700 hardware in more detail, and explains how to set up and use the accompanying Prototyping Board.

NOTE: It is assumed that you have the RCM3700 Development Kit. If you purchased an

RCM3700 module by itself, you will have to adapt the information in this chapter and elsewhere to your test and development setup.

2.1 Step 1 — Install Dynamic C

T o develop and debug programs for the RCM3700 (and for all other Rabbit hardware), you must install and use Dynamic C.

If you have not yet installed Dynamic C version 8.11 (or a later version), do so now by inserting the Dynamic C CD from the RCM3700 Development Kit in your PC’s CD-ROM drive. If autorun is enabled, the CD installation will begin automatically.

If autorun is disabled or the installation otherwise does not start, use the Windows

Start | Run menu or Windows Disk Explorer to launch setup.exe from the root folder

of the CD-ROM. The installation program will guide you through the installation process. Most steps of the

process are self-explanatory. Dynamic C uses a COM (serial) port to communicate with the target development system.

The installation allows you to choose the COM port that will be used. The default selection is COM1. You may select any available port for Dynamic C’s use. If you are not certain which port is available, select COM1. This selection can be changed later within Dynamic C.

NOTE: The installation utility does not check the selected COM port in any way. Speci-

fying a port in use by another device (mouse, modem, etc.) may lead to a message such

"could not open serial port" when Dynamic C is started.

Once your installation is complete, you will have up to three icons on your PC desktop. One icon is for Dynamic C, one opens the documentation menu, and the third is for the Rabbit Field Utility, a tool used to download precompiled software to a target system.

If you have purchased any of the optional Dynamic C modules, install them after installing Dynamic C. The modules may be installed in any order. You must install the modules in the same directory where Dynamic C was installed.

RabbitCore RCM3700 User’s Manual 9

2.2 Hardware Connections

/RESET

LDE0

LED2

LED4

LED6

GND

+BKLT

/CS

LED1

LED3

LED5

GND

D1D3D5

GND

A3A1D0D2D4D6GND

+BKLT

/CS

LED1

LED3

LED5

GND

D1D3D5

IR1

R1 R2 R3 R4

JP1

+485

GND

485

JP2

R12

R11

C10

R13

C11

GND

/IORD

PB5

PB3

PA0

PA6

PB0

/RES

+5V

PF4

PF6

PC1/PG2

PC0_TXD

PE5

PE1

PG7_RXE

PD4

VBAT

PA4 PA2

/IOWR

PE7

PB4

PB2

PA1

PA3

PA5

PA7

PB7

PF0

PF1

PF5

PF7

PE4

PE0

PD5

PG6 TXE

PC2 TXC

PC3/ PG3

GND

RXC TXC RXE

GND

C12

C13

C15

C14

C17

C18

R14

C19

DCIN

+3.3V

GND

+5V

GND

+3.3V

LCD1JB

LCD1JC

LCD1JA

C16

R15

BT1

GND

TXD

RXD

TXE

GND

TCM_SMT_SOCKET

+5V

VBAT

PD5

/IORD

PG6_TXE

PE0

PE4

PE7

PC2_TXC

PC0_TXD

PF6

PF4

PB5

PB3

PB0

PF1

PA1

PA3

PA5

PA7

GND

R16

GND

/RES

PD4

/IOWR

PE1

PE5

PC3/PG3

PF7

PF5

PB7

PB4

PB2

PF0

PA0

PA2

PA4

PA6

PG7

RXE

PC1/

PG2

C22

C26

R21

R18

C20

R19

C21

R20

R22

JP4

RP1

CX1 CX2

CX3

CX4

CX5

CX6

CX7

CX8

CX9

CX10CX11

UX2

UX1

R23

C24 C25

C23

C27 R25

R24

C28

R26

R27

R28

R29

JP8

R30 R31 R32

R33

R34

R35

R36

C35

R43

C29

THERMISTOR

R37

VREF

AGND

R44

THERM_IN

AIN

06050403020100

AIN

AGND

R38

C30

C31

C32

C33

C34

R39 R40

R41 R42

R48

DS1

DS2

R45

R49

R46

DS3

R47

S2S1

CONVERT

JP5

JP6

JP7

NCNCNC

/RSTETLED0

LED2

LED4

LED6

GNDA3A1D0D2D4D6

RCM36/37XX SERIES

PROTOTYPING BOARD

RESET

R24

C18

C34

RP1

RP2

R18

R36

C35

C19

C26

C27

C28

R15

R16

C36

C39

R13

C25

JP1

JP3

C33

C32

C30

C31

C15

C17

C20

C38

C41

R11

C37

R4 R5

C29

JP2

C40

C10

C49

C14

C12

C22

C23

C57

R31

C58

R29

DS2

R32

R30

DS1

R34

C16

R28

C24

C21

C53

R26

R33

U11

C54 C55

R27

TCM_SMT_SOCKET

Align shaded corners

RCM3700

There are three steps to connecting the Prototyping Board for use with Dynamic C and the sample programs:

1. Attach the RCM3700 module to the Prototyping Board.

2. Connect the programming cable between the RCM3700 and the COM port on the workstation PC.

3. Connect the power supply to the Prototyping Board.

The connections are shown for the RCM3700 Prototyping Board, and are similar for the RCM3720 Prototyping Board.

2.2.1 Step 1 — Attach Module to Prototyping Board

Turn the RCM3700 module so that the Ethernet jack is on the left as shown in Figure 2 below. Insert the module’s J1 header into the TCM_SMT_SOCKET socket on the Prototyping Board. The shaded corner notch at the bottom right corner of the RCM3700 module should face the same direction as the corresponding notch below it on the Prototyping Board.

NOTE: It is important that you line up the pins on header J1 of the RCM3700 module

Press the module’s pins firmly into the Prototyping Board headers.

RabbitCore RCM3700 User’s Manual 10

exactly with the corresponding pins of the TCM_SMT_SOCKET socket on the Prototyping Board. The header pins may become bent or damaged if the pin alignment is offset, and the module will not work. Permanent electrical damage to the module may also result if a misaligned module is powered up.

Figure 2. Install the RCM3700 Series on the Prototyping Board

2.2.2 Step 2 — Connect Programming Cable

The programming cable connects the RCM3700 to the PC running Dynamic C to download programs and to monitor the RCM3700 module during debugging.

Connect the 10-pin connector of the programming cable labeled PROG to header J2 on the RCM3700 as shown in Figure 3. Be sure to orient the marked (usually red) edge of the cable towards pin 1 of the connector . (Do not use the DIAG connector, which is used for a normal serial connection.)

Figure 3. Connect Programming Cable and Power Supply

NOTE: Never disconnect the programming cable by pulling on the ribbon cable.

Carefully pull on the connector to remove it from the header.

NOTE: Be sure to use the programming cable (part number 101-0542) supplied with this

Development Kit—the programming cable has blue shrink wrap around the RS-232 converter section located in the middle of the cable. The simplified programming cable and adapter board that are supplied with the Ethernet Connection Kit may also be used as shown in the inset diagram above. Programming cables from other Rabbit kits are not designed to work with RCM3700 modules.

Connect the other end of the programming cable to a COM port on your PC.

NOTE: Some PCs now come equipped only with a USB port. It may be possible to use

an RS-232/USB converter (Part No. 20-151-0178) with the programming cables mentioned above. Note that not all RS-232/USB converters work with Dynamic C.

RabbitCore RCM3700 User’s Manual 11

2.2.3 Step 3 — Connect Power

When all other connections have been made, you can connect power to the Prototyping Board.

First, prepare the AC adapter for the country where it will be used by selecting the plug. The RCM3700 Development Kit presently includes Canada/Japan/U.S., Australia/N.Z., U.K., and European style plugs. Snap in the top of the plug assembly into the slot at the top of the AC adapter as shown in Figure 3, then press down on the spring-loaded clip below the plug assembly to allow the plug assembly to click into place.

Connect the AC adapter to 3-pin header J4 on the Prototyping Board as shown in Figure 3. The connector may be attached either way as long as it is not offset to one side.

Plug in the AC adapter. The LED above the RESET button on the Prototyping Board should light up. The RCM3700 and the Prototyping Board are now ready to be used.

NOTE: A RESET button is provided on th e Prototyping Bo ard to allow a hardware reset

without disconnecting power.

To power down the Prototyping Board, unplug the power connector from J4. You should disconnect power before making any circuit adjustments in the prototyping area, changing any connections to the board, or removing the RCM3700 from the Prototyping Board.

2.2.3.1 Overseas Development Kits

Development kits sold outside North America before 2009 included a header connector that could be connected to 3-pin header J4 on the Prototyping Board. The connector could be attached either way as long as it was not offset to one side. The red and black wires from the connector could then be connected to the positive and negative connections on your power supply. The power supply should deliver 7.5 V–30 V DC at 500 mA.

RabbitCore RCM3700 User’s Manual 12

2.3 Starting Dynamic C

Once the RCM3700 is connected as described in the preceding pages, start Dynamic C by double-clicking on the Dynamic C icon on your desktop or in your Start menu.

If you are using a USB port to connect your computer to the RCM3700, choose Options >

Project Options

and select “Use USB to Serial Converter.” You may have to determine

which COM port was assigned to the RS-232/USB converter. Click OK.

2.4 Run a Sample Program

Use the File menu to open the sample program PONG.C, which is in the Dynamic C

SAMPLES folder. Press function key F9 to compile and run the program. The STDIO

window will open on your PC and will display a small square bouncing around in a box. This program shows that the CPU is working.

2.4.1 Troubleshooting

If Dynamic C cannot find the target system (error message "No Rabbit Processor

Detected."

• Check that the RCM3700 is powered correctly — the red power lamp on the Prototyping

Board should be lit when the RCM3700 is mounted on the Prototyping Board and the AC adapter is plugged in

• Check both ends of the programming cable to ensure that they are firmly plugged into the PC and the PROG connector, not the DIAG connector, is plugged in to the programming port on the RCM3700 with the marked (colored) edge of the programming cable towards pin 1 of the programming header.

• Ensure that the RCM3700 module is firmly and correctly installed in its connectors on the Prototyping Board.

• Dynamic C uses the COM port specified during installation. Select a different COM port within Dynamic C. From the

Communications. Select another COM port from the list, then click OK. Press <Ctrl-Y> to force Dynamic C to recompile the BIOS. If Dynamic C still reports it is

Options menu, select Project Options, then select

unable to locate the target system, repeat the above steps until you locate the COM port used by the programming cable.

RabbitCore RCM3700 User’s Manual 13

If Dynamic C appears to compile the BIOS successfully, but you then receive a communication error message when you compile and load the sample program, it is possible that your PC cannot handle the higher program-loading baud rate. Try changing the maximum download rate to a slower baud rate as follows.

• Locate the Serial Options dialog in the Dynamic C Options > Project Options > Communications menu. Select a slower Max download baud rate.

If a program compiles and loads, but then loses target communication before you can begin debugging, it is possible that your PC cannot handle the default debugging baud rate. Try lowering the debugging baud rate as follows.

• Locate the Serial Options dialog in the Dynamic C Options > Project Options > Communications menu. Choose a lower debug baud rate.

2.5 Where Do I Go From Here?

If the sample program ran fine, you are now ready to go on to other sample programs and to develop your own applications. The source code for the sample programs

you to modify them for your own use. The RCM3700 User’s Manual also provides

complete hardware reference information and describes the software function calls for the RCM3700, the Prototyping Board, and the optional LCD/keypad module.

For advanced development topics, refer to the Dynamic C User’s Manual, also in the online documentation set.

is provided to allow

2.5.1 Technical Support

NOTE: If you purchased your RCM3700 through a distributor or through a Rabbit partner,

contact the distributor or partner first for technical support.

If there are any problems at this point:

• Use the Dynamic C Help menu to get further assistance with Dynamic C.

• Check the Rabbit Technical Bulletin Board and forums at www.rabbit.com/support/bb/

and at www.rabbit.com/forums/.

• Use the Technical Support e-mail form at www.rabbit.com/support/.

RabbitCore RCM3700 User’s Manual 14

3. RUNNING SAMPLE PROGRAMS

To develop and debug programs for the RCM3700 (and for all other Rabbit hardware), you must install and use Dynamic C.

3.1 Introduction

To help familiarize you with the RCM3700 modules, Dynamic C includes several sample programs. Loading, executing and studying these programs will give you a solid hands-on overview of the RCM3700’s capabilities, as well as a quick start with Dynamic C as an application development tool.

NOTE: The sample programs assume that you have at least an elementary grasp of the C

programming language. If you do not, see the introductory pages of the Dynamic C User’s Manual for a suggested reading list.

In order to run the sample programs discussed in this chapter and elsewhere in this manual,

1. Your RCM3700 must be plugged in to the Prototyping Board as described in Chapter 2, “Getting Started.”

2. Dynamic C must be installed and running on your PC.

3. The programming cable must connect the programming header (J2) on the RCM3700 to your PC.

4. Power must be applied to the RCM3700 through the Prototyping Board.

Refer to Chapter 2, “Getting Started,” if you need further information on these steps. To run a sample program, open it with the File menu, then compile and run it by pressing

F9. The RCM3700 must be connected to a PC using the programming cable.

Complete information on Dynamic C is provided in the Dynamic C User’s Manual.

RabbitCore RCM3700 User’s Manual 15

The default I/O configuration in the sample programs is based on the RabbitCore module detected during compile time:

• Any RCM3700 RabbitCore module (except the RCM3720) will have its I/O ports configured for an RCM3700 Prototyping Board.

• An RCM3720 RabbitCore module will have its I/O ports configured for an RCM3720 Prototyping Board.

You may override these default settings to run an RCM3720 RabbitCore module on the RCM3700 Prototyping Board or to run another RCM3700 RabbitCore module on the RCM3720 Prototyping Board by adding the following macro to the sample program you will be running.

• To run an RCM3720 RabbitCore module on an RCM3700 Prototyping Board, add the following macro at the top of the sample program you will be running.

#define RCM3700_PROTOBOARD

Sample programs that are specifically designed for the RCM3700 Prototyping Board already have this macro included.

• To run an RCM3700 RabbitCore module (other than the RCM3720) on an RCM3720 Prototyping Board, add the following macro at the top of the sample program you will be running.

#define RCM3720_PROTOBOARD

RabbitCore RCM3700 User’s Manual 16

3.2 Sample Programs

Of the many sample programs included with Dynamic C, several are specific to the RCM3700. Sample programs illustrating the general operation of the RCM3700, serial communication, and the A/D converter on the Prototyping Board are provided in the

SAMPLES\RCM3700 and the SAMPLES\RCM3720 folders as shown in the table below . The

sample programs use the features available on the two Prototyping Boards.

Feature

Sample Program Folder SAMPLES\RCM3700 SAMPLES\RCM3720

Digital I/O × ×

IrDA Transceivers ×

Serial Flash × ×

Serial Communication × ×

TCP/IP × ×

A/D Converter ×

LCD/Keypad Module ×

Dynamic C FAT File System,

RabbitWeb,

SSL Modules

RCM3700 Prototyping

Board

××

RCM3720 Prototyping

Board

Each sample program has comments that describe the purpose and function of the program. Follow the instructions at the beginning of the sample program. Note that the RCM3700 must be installed on the Prototyping Board when using these sample programs.

TCP/IP sample programs are described in Chapter 6, “Using the TCP/IP Features.” Sample programs for the optional LCD/keypad module that is used on the RCM3700 Prototyping Board are described in Appendix C.

Additional sample programs are available online at www.rabbit.com/support/down-

loads/downloads_prod.shtml.

DIO.c—Demonstrates the digital I/O capabilities of the A/D converter on the Proto-

•

typing Board by configuring two lines to outputs and two lines as inputs on Prototyping Board header JP4.

If you are using the RCM3700 Prototyping Board, install a 2 x 2 header at JP4 and connect pins 1–2 and pins 3–4 on header JP4 before running this sample program.

• FLASHLED.c—Demonstrates assembly-language program by flashing LEDs DS1 and DS2 on the Prototyping Board at different rates.

• TOGGLESWITCH.c—Uses costatements to detect switches using debouncing. The corresponding LEDs (DS1 and DS2) will turn on or off.

RabbitCore RCM3700 User’s Manual 17

• CONTROLLED.c—Demonstrates use of the digital inputs by having you turn the LEDs on the Prototyping Board on or off from the STDIO window on your PC.

Once you compile and run CONTROLLED.C, the following display will appear in the Dynamic C STDIO window.

Press “1” or “2” on your keyboard to select LED DS1 or DS2 on the Prototyping Board. Then follow the prompt in the Dynamic C STDIO window to turn the LED on or off.

• IR_DEMO.c—Demonstrates sending Modbus ASCII packets between two RCM3700 Prototyping Board assemblies with IrDA transceivers via the IrDA transceivers. Note that this sample program will only work with the RCM3700 Prototyping Board.

First, compile and run this program on one Prototyping Board assembly, then remove the programming cable and press the RESET button on the Prototyping Board so that the first RabbitCore module is operating in the

Run mode. Then connect the program-

ming cable to the second Prototyping Board assembly with the RCM3700 and compile and run the same sample program. With the programming cable still connected to the second Prototyping Board assembly, press switch S1 on the second Prototyping Board to transmit a packet. Once the first Prototyping Board assembly receives a test packet, it will send back a response packet that will be displayed in the Dynamic C

STDIO win-

dow. The test packets and response packets have different codes.

Once you have loaded and executed these five programs and have an understanding of how Dynamic C and the RCM3700 modules interact, you can move on and try the other sample programs, or begin building your own.

RabbitCore RCM3700 User’s Manual 18

3.2.1 Use of Serial Flash

RXC TXC RXE

GND

TXD

RXD

TXE

GND

The following sample programs can be found in the SAMPLES\RCM3700\SerialFlash and the SAMPLES\RCM3720\SerialFlash folders.

• SERIAL_FLASHLOG.C—This program runs a simple Web server and stores a log of hits on the home page of the serial flash “server .” This log can be viewed and cleared from a browser at http://10.10.6.100/. You may need to first “configure” your PC for a “10Base-T Half-Duplex” or an “Auto-Negotiation” connection from the “Advanced” tab, which is accessed from the control panel (Start > Settings > Control Panel) by choosing Network Connections.

• SFLASH_INSPECT.C—This program is a handy utility for inspecting the contents of a serialflash chip. When the sample program starts running, it attempts to initialize a serial flash chip on Serial Port B. Once a serial flash chip is found, the user can perform two different commands to either print out the contents of a specified page or clear (set to zero) all the bytes in a specified page.

3.2.2 Serial Communication

The following sample programs can be found in the SAMPLES\RCM3700\SERIAL and the

SAMPLES\RCM3720\SERIAL folders.

NOTE: PE5 is set up to enable/disable the RS-232 chip on the RCM3700 Prototyping

Board. This pin will also be toggled when you run RS-232 sample programs on an RCM3700 Prototyping Board. If you plan to use this pin for something else while you are running any of the RS-232 sample programs, comment out the following line.

BitWrPortI(PEDR, &PEDRShadow, 0, 5);//set low to enable rs232 device

• FLOWCONTROL.C—This program demonstrates hardware flow control by configuring

Serial Port C for CTS/RTS with serial data coming from Serial Port D. The serial data received are displayed in the STDIO window.

To set up the Prototyping Board, you will need to tie TxC and RxC together on the RS-232 header at J2, and you will also tie TxD and RxD together using the jumpers supplied in the Development Kit as shown in the diagram.

A repeating triangular pattern should print out in the

STDIO window.

The program will periodically switch flow control on or off to demonstrate the effect of no flow control.

Refer to the function description for

serDflowcontrolOn() in the Dynamic C

Function Reference Manual for a general description on how to set up flow-control

lines.

RabbitCore RCM3700 User’s Manual 19

• PARITY.C—This program demonstrates the use of parity modes by

RXC TXC RXE

GND

TXD

RXD

TXE

GND

RXC TXC RXE

GND

TXD

RXD

TXE

GND

RXC TXC RXE

GND

TXD

RXD

TXE

GND

RXC TXC RXE

GND

TXD

RXD

TXE

GND

JP2

repeatedly sending byte values 0–127 from Serial Port D to Serial Port C. The program will switch between generating parity or not on Serial Port D. Serial Port C will always be checking parity, so parity errors should occur during every other sequence.

To set up the Prototyping Board, you will need to tie TxD and RxC together on the RS-232 header at J2 using the 0.1" jumpers supplied in the Development Kit as shown in the diagram.

The Dynamic C STDIO window will display the error sequence.

• SIMPLE3WIRE.C—This program demonstrates basic RS-232 serial communication. Lower case characters are sent by TxC, and are received by RxD. The characters are converted to upper case and are sent out by TxD, are received by RxC, and are displayed in the Dynamic C STDIO window.

To set up the Prototyping Board, you will need to tie TxD and RxC together on the RS-232 header at J2, and you will also tie RxD and TxC together using the 0.1" jumpers supplied in the Development Kit as shown in the diagram.

• SIMPLE5WIRE.C—This program demonstrates 5-wire RS-232 serial communication with flow control on Serial Port C and data flow on Serial Port D.

To set up the Prototyping Board, you will need to tie TxD and RxD together on the RS-232 header at J2, and you will also tie TxC and RxC together using the 0.1" jumpers supplied in the Development Kit as shown in the diagram.

Once you have compiled and run this program, you can test flow control by disconnecting TxC from RxC while the program is running. Characters will no longer appear in the STDIO window, and will display again once TxC is connected back to RxC.

SWITCHCHAR.C—This program transmits and then receives an ASCII string on Serial

•

Ports C and E. It also displays the serial data received from both ports in the

STDIO

window. Before running this sample program, check to make sure that Serial

Port E is set up as an RS-232 serial port—pins 1–3 and pins 2–4 on header JP2 on the Prototyping Board must be jumpered together using the 2 mm jumpers supplied in the Development Kit. Then connect TxC to RxE and connect RxC to TxE on the RS-232 header at J2 using the

0.1" jumpers supplied in the Development Kit as shown in the diagram.

RabbitCore RCM3700 User’s Manual 20

NOTE: The following two sample programs illustrating RS-485 serial communication

JP2

will only work with the RCM3700 Prototyping Board.

• SIMPLE485MASTER.C—This program demonstrates a simple RS-485 transmission of lower case letters to a slave RCM3700. The slave will send back converted upper case letters back to the master RCM3700 and display them in the STDIO window. Use

SIMPLE485SLAVE.C to program the slave RCM3700, and check to make sure that

Serial Port E is set up as an RS-485 serial port—pins 3–5 and pins 4–6 on header JP2 must be jumpered together using the 2 mm jumpers supplied in the Development Kit.

• SIMPLE485SLAVE.C—This program demonstrates a simple RS-485 transmission of lower case letters to a master RCM3700. The slave will send back converted upper case letters back to the master RCM3700 and display them in the STDIO window. Use

SIMPLE485MASTER.C to program the master RCM3700, and check to make sure that

Serial Port E is set up as an RS-485 serial port—pins 3–5 and pins 4–6 on header JP2 must be jumpered together using the 2 mm jumpers supplied in the Development Kit.

RabbitCore RCM3700 User’s Manual 21

3.2.3 A/D Converter Inputs

The following sample programs are found in the SAMPLES\RCM3700\ADC folder.

• AD_CALDIFF_CH.C—Demonstrates how to recalibrate one differential analog input channel using two known voltages to generate the ca li br at io n constants for that channel. Constants will be rewritten into user block data area.

Before running this program, make sure that pins 1–3 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. No pins are connected on header JP8.

• AD_CALMA_CH.C—Demonstrates how to recalibrate an A/D input channel being used to convert analog current measurements to generate the calibration constants for that channel.

Before running this program, make sure that pins 3–5 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. Connect pins 1–2, 3–4, 5–6, 7–8 on header JP8.

• AD_CALSE_ALL.C—Demonstrates how to recalibrate all single-ended analog input channels for one gain, using two known voltages to generate the calibration constants for each channel. Constants will be rewritten into the user block data area.

Before running this program, make sure that pins 3–5 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. No pins are connected on header JP8.

• AD_CALSE_CHAN.C—Demonstrates how to recalibrate one single-ended analog input channel with one gain using two known voltages to generate the calibration constants for that channel. Constants will be rewritten into user block data area.

Before running this program, make sure that pins 3–5 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. No pins are connected on header JP8.

NOTE: The above sample programs will overwrite any existing calibration constants.

• AD_RDDIFF_CH.C—Demonstrates how to read an A/D input channel being used for a differential input using previously defined calibration constants.

Before running this program, make sure that pins 1–3 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. No pins are connected on header JP8.

• AD_RDMA_CH.C—Demonstrates how to read an A/D input channel being used to convert analog current measurements using previously defined calibration constants for that channel.

Before running this program, make sure that pins 3–5 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. Connect pins 1–2, 3–4, 5–6, 7–8 on header JP8.

• AD_RDSE_ALL.C—Demonstrates how to read all single-ended A/D input channels using previously defined calibration constants.

Before running this program, make sure that pins 3–5 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. No pins are connected on header JP8.

RabbitCore RCM3700 User’s Manual 22

• AD_SAMPLE.C—Demonstrates how to use a low-level driver on single-ended inputs. The program will continuously display the voltage (average of 10 samples) that is present on the A/D channels.

Before running this program, make sure that pins 3–5 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. No pins are connected on header JP8.

• ANAINCONFIG.C—Demonstrates how to use the Register Mode method to read singleended analog input values for display as voltages. The sample program uses the function call anaInConfig() and the ADS7870 CONVERT line to accomplish this task.

Before running this program, make sure that pins 3–5 are connected on headers JP5, JP6, and JP7 on the Prototyping Board. No pins are connected on header JP8. Also connect PE4 on header J3 on the Prototyping Board to the CNVRT terminal on header J8.

If you use this sample program as a template for your own program, be aware that PE4 is also used for the IrDA FIR_SEL on the Prototyping Board. You will need to use another parallel port line for the analog input if you are also using the IrDA transceiver.

• THERMISTOR.C—Demonstrates how to use analog input THERM_IN7 to calculate temperature for display to the STDIO window. This sample program assumes that the thermistor is the one included in the Development Kit whose values for beta, series resistance, and resistance at standard temperature are given in the part specification.

Before running this program, install the thermistor into the AIN7 and AGND holes at location J7 on the Prototyping Board.

Before running the next two sample programs, DNLOADCALIB.C or UPLOADCALIB.C, connect your PC serial COM port to header J2 on the Prototyping Board as follows.

• Tx to RxE

• Rx to TxE

• GND to GND

Then connect pins 1–3 and 2–4 on header JP2 on the Prototyping Board. You will need to run a serial utility such as Tera Term on your PC. You may download

Tera Term from hp.vector.co.jp/authors/VA002416/teraterm.html. Once Tera Term is run- ning, configure the serial parameters as follows.

• Baud rate 19200, 8 bits, no parity, and 1 stop bit.

• Enable the "Local Echo" option.

• Set the line feed options to Receive = CR and Transmit = CR + LF.

Now press F9 to compile and run this program. Verify that the message "Waiting, Please Send Data file" is being display in Tera Term display window before proceeding. From within Tera Term, select File > Send File > Path and filename, then select the OPEN option within the dialog box. Once the data file has been downloaded, it will indicate whether the calibration data were written successfully.

RabbitCore RCM3700 User’s Manual 23

• DNLOADCALIB.C—Demonstrates how to retrieve analog calibration data to rewrite it back to simulated EEPROM in flash with using a serial utility such as Tera Term.

• UPLOADCALIB.C—Demonstrates how to read calibrations constants from the user block in flash memory and then transmitting the file using a serial port and a PC serial utility such as Tera Term. Use DNLOADCALIB.C to download the calibration constants created by this program.

RabbitCore RCM3700 User’s Manual 24

4. HARDWARE REFERENCE

SRAM

11 MHz

osc

32 kHz

osc

RabbitCore Module

Customer-supplied external 3 V battery

CMOS-level signals

RS-232, RS-485, IrDA

serial communication

drivers on motherboard

Customer-specific

applications

Battery-Backup

Circuit

Level

converter

Ethernet

Program

Flash

Serial Flash

RABBIT

3000

Chapter 4 describes the hardware components and principal hardware subsystems of the RCM3700. Appendix A, “RCM3700 Specifications,” provides complete physical and electrical specifications.

Figure 4 shows the Rabbit-based subsystems designed into the RCM3700.

RabbitCore RCM3700 User’s Manual 25

Figure 4. RCM3700 Subsystems

4.1 RCM3700 Digital Inputs and Outputs

Note:

These pinouts are as seen on the Bottom Side of the module.

PA6 PA4 PA2 PA0 PF0 PB2 PB4 PB7 PF5

PF7 PC1/PG2 PC3/PG3

PE5

PE1

PG7

/IOWR

PD4

/RES

GND GND

PA7 PA5 PA3 PA1 PF1 PB0 PB3 PB5 PF4 PF6 PC0 PC2 PE7 PE4 PE0 PG6 /IORD PD5 VBAT +5 V

Figure 5 shows the RCM3700 pinouts for header J1.

Header J1 is a standard 2 x 20 IDC header with a nominal 0.1" pitch.

RabbitCore RCM3700 User’s Manual 26

Figure 5. RCM3700 Pinouts

Figure 6 shows the use of the Rabbit 3000 microprocessor ports in the RCM3700 modules.

Port A

Port B

Port D

(+Ethernet Port)

Port E

PA0PA7

PB0, PB7,

PB2PB5

PE0PE1, PE4PE5, PE7

PD4PD5

/RES, /IOWR

Watchdog

11 Timers

Clock Doubler

Slave Port

Real-Time Clock

RAM

Backup Battery

Support

Flash

Port C

(Serial Ports C & D)

Programming

Port

(Serial Port A)

Ethernet

Port

4 Ethernet signals

PC6, STATUS

PB1, PC7, /RESET,

SMODE0, SMODE1

PC0, PC2

PC1, PC3

Port G

(Serial Ports E & F)

Port F

PF4PF7

Misc. I/O

/RES /IORD

PG2PG3 PG6PG7

RABBIT

3000

Figure 6. Use of Rabbit 3000 Ports

The ports on the Rabbit 3000 microprocessor used in the RCM3700 are configurable, and so the factory defaults can be reconfigured. Table 2 lists the Rabbit 3000 factory defaults and the alternate configurations.

RabbitCore RCM3700 User’s Manual 27

Table 2. RCM3700 Pinout Configurations

Pin Pin Name Default Use Alternate Use Notes

External data bus

1–8 PA[7:0] Parall el I/O

(ID0–ID7)

Slave port data bus

(SD0–SD7)

External Data Bus

9 PF1 Input/Output

10 PF0 Input/Output

11 PB0 Input/Output CLKB

12 PB2 Input/Output

13 PB3 Input/Output

14 PB4 Input/Output

15 PB5 Input/Output

16 PB7 Input/Output

Header J1

17 PF4 Input/Output

QD1A CLKC

QD1B CLKD

IA0 /SWR

IA1 /SRD

IA2 SA0

IA3 SA1

IA5 /SLAVEATTN

AQD1B PWM0

External Address 0 Slave port write

External Address 1 Slave port read

External Address 2 Slave Port Address 0

External Address 3 Slave Port Address 1

External Address 5 Slave Port Attention

18 PF5 Input/Output

19 PF6 Input/Output

20 PF7 Input/Output

AQD1A PWM1

AQD2B PWM2

AQD2A PWM3

21 PC0 Output TXD Serial Port D

22 PC1/PG2 Input/Output RXD/TXF

Serial Port D Serial Port F

23 PC2 Output TXC Serial Port C

24 PC3/PG3 Input/Output RXC/RXF

25 PE7 Input/Output

RabbitCore RCM3700 User’s Manual 28

I7 /SCS

Serial Port C Serial Port F

I/O Strobe 7 Slave Port Chip Select

Table 2. RCM3700 Pinout Configurations (continued)

Pin Pin Name Default Use Alternate Use Notes

26 PE5 Input/Output

27 PE4 Input/Output

28 PE1 Input/Output

29 PE0 Input/Output

I5 INT1B

I4 INT0B

I1 INT1A

I0 INT0A

I/O Strobe 5 Interrupt 1B

I/O Strobe 4 Interrupt 0B

I/O Strobe 1 Interrupt 1A

I/O Strobe 0 Interrupt 0A

30 PG7 Input/Output RXE

Serial Port E

31 PG6 Input/Output TXE 32 /IOWR Output External write strobe

Header J1

33 /IORD Output External read strobe 34 PD4 Input/Output ATXB

Alternate Serial Port B

35 PD5 Input/Output ARXB

36 /RES Reset output Reset input

Reset output from Reset

Generator 37 VBAT 38 GND 39 +5 V 40 GND

RabbitCore RCM3700 User’s Manual 29

4.1.1 Memory I/O Interface

The Rabbit 3000 address lines (A0–A18) and all the data lines (D0–D7) are routed internally to the onboard flash memory and SRAM chips. I/0 write (/IOWR) and I/0 read (/IORD) are available for interfacing to external devices.

Parallel Port A can also be used as an external I/O data bus to isolate external I/O from the main data bus. Parallel Port B pins PB2–PB5 and PB7 can also be used as an external address bus.

When using the external I/O bus for either Ethernet or the LCD/keypad module on the Prototyping Board, or for any other reason, you must add the following line at the beginning of your program.

#define PORTA_AUX_IO // required to enable external I/O bus

4.1.2 Other Inputs and Outputs

/RES is an output from the reset circuitry that can be used to reset other peripheral devices. This pin can also be used to reset the microprocessor.

RabbitCore RCM3700 User’s Manual 30

4.2 Serial Communication

TXC

RXC

RXD

TXD

TXF RXF

PC2

PC3

PC0

PC1

PG2

PG3

J1: 23

J1: 24

J1: 21

J1: 22

The RCM3700 board does not have any serial transceivers directly on the board. However, a serial interface may be incorporated on the board the RCM3700 is mounted on. For example, the Prototyping Board has RS-232, RS-485 and IrDA transceiver chips.

4.2.1 Serial Ports

There are five serial ports designated as Serial Ports A, C, D, E, and F. All five serial ports can operate in an asynchronous mode up to the baud rate of the system clock divided by 8. An asynchronous port can handle 7 or 8 data bits. A 9th bit address scheme, where an additional bit is sent to mark the first byte of a message, is also supported.

Serial Port A is normally used as a programming port, but may be used either as an asynchronous or as a clocked serial port once application development has been completed and the RCM3700 is operating in the Run Mode.

Serial Ports C and D can also be operated in the clocked serial mode. In this mode, a clock line synchronously clocks the data in or out. Either of the two communicating devices can supply the clock.

Serial Ports E and F can also be configured as HDLC serial ports. The IrDA protocol is also supported in SDLC format by these two ports.

Serial Port F shares its pins with Serial Ports C and D on header J1, as shown in Figure 7. The selection of port(s) depends on your need for two clocked serial ports (Serial Ports C and D) vs. a second HDLC serial port (Serial Port F).

Figure 7. RCM3700 Serial Ports C, D, and F

The serial ports used are selected with the serXOpen function call, where X is the serial port (C, D, or F). Remember that RxC and RxD on Serial Ports C and D cannot be used if Serial Port F is being used

RabbitCore RCM3700 User’s Manual 31

4.2.2 Ethernet Port

ETHERNET

RJ-45 Plug

1. E_Tx+

2. E_Tx

3. E_Rx+

6. E_Rx

RJ-45 Jack

Figure 8 shows the pinout for the RJ-45 Ethernet port (J3). Note that some Ethernet connectors are numbered in reverse to the order used here.

Figure 8. RJ-45 Ethernet Port Pinout

Two LEDs are placed next to the RJ-45 Ethernet jack, one to indicate an Ethernet link (LINK) and one to indicate Ethernet activity (ACT).

The RJ-45 connector is shielded to minimize EMI effects to/from the Ethernet signals.

RabbitCore RCM3700 User’s Manual 32

4.2.3 Serial Programming Port

The RCM3700 programming port is accessed through header J2 or over an Ethernet connection via the RabbitLink EG2110. The programming port uses the Rabbit 3000’s Serial Port A for communication. Dynamic C uses the programming port to download and debug programs.

The programming port is also used for the following operations.

• Cold-boot the Rabbit 3000 on the RCM3700 after a reset.

• Remotely download and debug a program over an Ethernet connection using the

RabbitLink EG2110.

• Fast copy designated portions of flash memory from one Rabbit-based board (the master) to another (the slave) using the Rabbit Cloning Board.

In addition to Serial Port A, the Rabbit 3000 startup-mode (SMODE0, SMODE1), status, and reset pins are available on the programming port.

The two startup mode pins determine what happens after a reset—the Rabbit 3000 is either cold-booted or the program begins executing at address 0x0000.

The status pin is used by Dynamic C to determine whether a Rabbit microprocessor is present. The status output has three different programmable functions:

1. It can be driven low on the first op code fetch cycle.

2. It can be driven low during an interrupt acknowledge cycle.

3. It can also serve as a general-purpose CMOS output.

The /RESET_IN pin is an external input that is used to reset the Rabbit 3000 and the RCM3700 onboard peripheral circuits. The serial programming port can be used to force a hard reset on the RCM3700 by asserting the /RESET_IN signal.

Alternate Uses of the Programming Port

All three clocked Serial Port A signals are available as

• a synchronous serial port

• an asynchronous serial port, with the clock line usable as a general CMOS input

The programming port may also be used as a serial port once the application is running. The SMODE pins may then be used as inputs and the status pin may be used as an output.

Refer to the Rabbit 3000 Microprocessor User’s Manual for more information.

RabbitCore RCM3700 User’s Manual 33

4.3 Serial Programming Cable

/RESET

LDE0

LED2

LED4

LED6

GND

+BKLT

/CS

LED1

LED3

LED5

GND

D1D3D5

GND

A3A1D0D2D4D6GND

+BKLT

/CS

LED1

LED3

LED5

GND

D1D3D5

IR1

R1 R2 R3 R4

JP1

+485

GND

485

JP2

R12

R11

C10

R13

C11

GND

/IORD

PB5

PB3

PA0

PA6

PB0

/RES

+5V

PF4

PF6

PC1/PG2

PC0_TXD

PE5

PE1

PG7_RXE

PD4

VBAT

PA4 PA2

/IOWR

PE7

PB4

PB2

PA1

PA3

PA5

PA7

PB7

PF0

PF1

PF5

PF7

PE4

PE0

PD5

PG6 TXE

PC2 TXC

PC3/ PG3

GND

RXC TXC RXE

GND

C12

C13

C15

C14

C17

C18

R14

C19

DCIN

+3.3V

GND

+5V

GND

+3.3V

LCD1JB

LCD1JC

LCD1JA

C16

R15

BT1

GND

TXD

RXD

TXE

GND

TCM_SMT_SOCKET

+5V

VBAT

PD5

/IORD

PG6_TXE

PE0

PE4

PE7

PC2_TXC

PC0_TXD

PF6

PF4

PB5

PB3

PB0

PF1

PA1

PA3

PA5

PA7

GND

R16

GND

/RES

PD4

/IOWR

PE1

PE5

PC3/PG3

PF7

PF5

PB7

PB4

PB2

PF0

PA0

PA2

PA4

PA6

PG7

RXE

PC1/

PG2

C22

C26

R21

R18

C20

R19

C21

R20

R22

JP4

RP1

CX1 CX2

CX3

CX4

CX5

CX6

CX7

CX8

CX9

CX10CX11

UX2

UX1

R23

C24 C25

C23

C27 R25

R24

C28

R26

R27

R28

R29

JP8

R30 R31 R32

R33

R34

R35

R36

C35

R43

C29

THERMISTOR

R37

VREF

AGND

R44

THERM_IN

AIN

06050403020100

AIN

AGND

R38

C30

C31

C32

C33

C34

R39 R40

R41 R42

R48

DS1

DS2

R45

R49

R46

DS3

R47

S2S1

CONVERT

JP5

JP6

JP7

NCNCNC

/RSTET

LED0

LED2

LED4

LED6

GNDA3A1D0D2D4D6

RCM36/37XX SERIES

PROTOTYPING BOARD

RESET

R24

C18

C34

RP1

RP2

R18

R36

C35

C19

C26

C27

C28

R15

R16

C36

C39

R13

C25

JP1

JP3

C33

C32

C30

C31

C15

C17

C20

C38

C41

R11

C37

R4 R5

C29

JP2

C40

C10

C49

C14

C12

C22

C23

C57

R31

C58

R29

DS2

R32

R30

DS1

R34

C16

R28

C24

C21

C53

R26

R33

U11

C54 C55

R27

Colored

edge

PC COM port

Blue

shrink wrap

PROG

DIAG

Programming

Cable

PROG

RESET RCM3700 when changing mode:

Press RESET button (if using Prototyping Board),

Cycle power off/on

after removing or attaching programming cable.

The programming cable is used to connect the programming port of the RCM3700 to a PC serial COM port. The programming cable converts the RS-232 voltage levels used by the PC serial port to the CMOS voltage levels used by the Rabbit 3000.

When the

PROG connector on the programming cable is connected to the RCM3700 pro-

gramming port, programs can be downloaded and debugged over the serial interface. The DIAG connector of the programming cable may be used on header J2 of the RCM3700

with the RCM3700 operating in the Run Mode. This allows the programming port to be used as a regular serial port.

4.3.1 Changing Between Program Mode and Run Mode

The RCM3700 is automatically in Program Mode when the PROG connector on the programming cable is attached, and is automatically in Run Mode when no programming cable is attached. When the Rabbit 3000 is reset, the operating mode is determined by the state of the SMODE pins. When the programming cable’s PROG connector is attached, the SMODE pins are pulled high, placing the Rabbit 3000 in the Program Mode. When the programming cable’s PROG connector is not attached, the SMODE pins are pulled low, causing the Rabbit 3000 to operate in the Run Mode.

RabbitCore RCM3700 User’s Manual 34

Figure 9. Switching Between Program Mode and Run Mode

A program “runs” in either mode, but can only be downloaded and debugged when the RCM3700 is in the Program Mode.

Refer to the Rabbit 3000 Microprocessor User’s Manual for more information on the programming port and the programming cable.

4.3.2 Standalone Operation of the RCM3700

The RCM3700 must be programmed via the RCM3700 Prototyping Board or via a similar arrangement on a customer-supplied board. Once the RCM3700 has been programmed successfully, remove the programming cable from the programming connector and reset the RCM3700. The RCM3700 may be reset by cycling the power off/on or by pressing the

RESET button on the Prototyping Board. The RCM3700 module may now be removed

from the Prototyping Board for end-use installation.

CAUTION: Power to the Prototyping Board or other boards should be disconnected

when removing or installing your RCM3700 module to protect against inadvertent shorts across the pins or damage to the RCM3700 if the pins are not plugged in correctly. Do not reapply power until you have verified that the RCM3700 module is plugged in correctly.

RabbitCore RCM3700 User’s Manual 35

4.4 Other Hardware

4.4.1 Clock Doubler

The RCM3700 takes advantage of the Rabbit 3000 microprocessor’s internal clock doubler . A built-in clock doubler allows half-frequency crystals to be used to reduce radiated emissions. The 22.1 MHz frequency specified for the RCM3700 is generated using a 11.06 MHz resonator.

The clock doubler may be disabled if 22.1 MHz clock speeds are not required. This will reduce power consumption and further reduce radiated emissions. Disable the clock doubler by adding a simple configuration macro as shown below.

1. Select the “Defines” tab from the Dynamic C Options > Project Options menu.

2. Add the line CLOCK_DOUBLED=0 to always disable the clock doubler. The clock doubler is enabled by default, and usually no entry is needed. If you need to

specify that the clock doubler is always enabled, add the line CLOCK_DOUBLED=1 to always enable the clock doubler.

3. Click OK to save the macro. The clock doubler will now remain off whenever you are in the project file where you defined the macro.

4.4.2 Spectrum Spreader

The Rabbit 3000 features a spectrum spreader, which helps to mitigate EMI problems. By default, the spectrum spreader is on automatically, but it may also be turned off or set to a stronger setting. The spectrum spreader settings may be changed through a simple configuration macro as shown below.

1. Select the “Defines” tab from the Dynamic C Options > Project Options menu.

2. Normal spreading is the default, and usually no entry is needed. If you need to specify normal spreading, add the line

ENABLE_SPREADER=1

For strong spreading, add the line

ENABLE_SPREADER=2

To disable the spectrum spreader, add the line

ENABLE_SPREADER=0

NOTE: The strong spectrum-spreading setting is not recommended since it may limit

the maximum clock speed or the maximum baud rate. It is unlikely that the strong setting will be needed in a real application.

3. Click OK to save the macro. The spectrum spreader will now be set to the state specified by the macro value whenever you are in the project file where you defined the macro.

NOTE: Refer to the Rabbit 3000 Microprocessor User’s Manual for more information

on the spectrum-spreading setting and the maximum clock speed.

RabbitCore RCM3700 User’s Manual 36

4.5 Memory

4.5.1 SRAM

RCM3700 series boards have 256K–512K of SRAM.

4.5.2 Flash EPROM

RCM3700 series boards also have 256K–512K of flash EPROM.

NOTE: Rabbit recommends that any customer applications should not be constrained by

the sector size of the flash EPROM since it may be necessary to change the sector size in the future.

Writing to arbitrary flash memory addresses at run time is al so discouraged. Instead, use a portion of the “user block” area to store persistent data. The functions writeUser- Block and readUserBlock are provided for this. Refer to the Rabbit 3000 Micropro-

cessor Designer’s Handbook

A Flash Memory Bank Select jumper configuration option based on 0  surface-mounted resistors exists at header JP1 on the RCM3700 modules. This option, used in conjunction with some configuration macros, allows Dynamic C to compile two different co-resident programs for the upper and lower halves of the 512K flash in such a way that both programs start at logical address 0000. This is useful for applications that require a resident download manager and a separate downloaded program. See T echnical Note TN218 in the online documentation, Implementing a Serial Download Manager for a 256K Flash, for details.

for additional information.

4.5.3 Serial Flash

A 1Mbyte serial flash is available to store data and Web pages. Sample programs in the SAMPLES\RCM3700 folder illustrate the use of the serial flash.

4.5.4 Dynamic C BIOS Source Files

The Dynamic C BIOS source files handle different standard RAM and flash EPROM sizes automatically.

RabbitCore RCM3700 User’s Manual 37

5. SOFTWARE REFERENCE

Dynamic C is an integrated development system for writing embedded software. It runs on an IBM-compatible PC and is designed for use with Rabbit single-board computers and other single-board computers based on the Rabbit microprocessor. Chapter 5 describes the libraries and function calls related to the RCM3700.

5.1 More About Dynamic C

Dynamic C has been in use worldwide since 1989. It is specially designed for programming embedded systems, and features quick compile and interactive debugging. A complete reference guide to Dynamic C is contained in the Dynamic C User’s Manual and in the Dynamic C Function Reference Manual.

You have a choice of doing your software development in the flash memory or in the SRAM included on the RCM3700. The flash memory and SRAM options are selected with the Options > Compiler menu.

The advantage of working in RAM is to save wear on the flash memory, which is limited to about 100,000 write cycles. The disadvantage is that the code and data might not both fit in RAM.

NOTE: An application can be compiled in RAM, but cannot run standalone from RAM

after the programming cable is disconnected. All standalone applications can only run from flash memory.

NOTE: Do not depend on the flash memory sector size or type in your program logic.

The RCM3700 and Dynamic C were designed to accommodate flash devices with various sector sizes in response to the volatility of the flash-memory market.

Developing software with Dynamic C is simple. Users can write, compile, and test C and assembly code without leaving the Dynamic C development environment. Debugging occurs while the application runs on the target. Alternatively, users can compile a program to an image file for later loading. Dynamic C runs on PCs under Windows 2000/NT and

later—see Rabbit’s Technical Note TN257, Running Dynamic C® With Windows Vista®, for additional information if you are using a Dynamic C release prior to v. 9.60 under Windows Vista. Programs can be downloaded at baud rates of up to 460,800 bps after the program compiles.

RabbitCore RCM3700 User’s Manual 38

Dynamic C has a number of standard features. Some of these standard features are listed below.

• Full-feature source and assembly-level debugger, no in-circuit emulator required.

• Royalty-free TCP/IP stack with source code and most common protocols.

• Hundreds of functions in source-code libraries and sample programs:

 exceptionally fast support for floating-point arithmetic and transcendental functions.  RS-232 and RS-485 serial communication.  analog and digital I/O drivers.

 I

C, SPI, GPS, file system.

 LCD display and keypad drivers.

• Powerful language extensions for cooperative or preemptive multitasking

• Loader utility program (Rabbit Field Utility) to load binary images to Rabbit-based tar-

gets without the presence of Dynamic C.

• Provision for customers to create their own source code libraries and augment on-line help by creating “function description” block comments using a special format for library functions.

• Standard debugging features:

 Breakpoints—Set breakpoints that can disable interrupts.  Single-stepping—Step into or over functions at a source or machine code level, µC/OS-II aware.  Code disassembly—The disassembly window displays addresses, opcodes, mnemonics, and

machine cycle times. Switch between debugging at machine-code level and source-code level by simply opening or closing the disassembly window.

 Watch expressions—Watch expressions are compiled when defined, so complex expressions

including function calls may be placed into watch expressions. Watch expressions can be updated with or without stopping program execution.

 Register window—All processor registers and flags are displayed. The contents of general registers

may be modified in the window by the user.

 Stack window—shows the contents of the top of the stack.  Hex memory dump—displays the contents of memo ry at any add ress.  STDIO window—

detected for debugging purposes.

printf outputs to this window and keyboard input on the host PC can be

printf output may also be sent to a serial port or file.

RabbitCore RCM3700 User’s Manual 39

5.2 Dynamic C Functions

The functions described in this section are for use with the Prototyping Board features. The source code is in the the SAMPLES\RCM3720 folder , depending on which Prototyping Board you will be using, if you need to modify it for your own board design.

Other generic functions applicable to all devices based on Rabbit microprocessors are described in the Dynamic C Function Reference Manual.

RCM37xx.LIB

library in the Dynamic C SAMPLES\RCM3700 or

RabbitCore RCM3700 User’s Manual 40

5.2.1 Board Initialization

void brdInit (void);

Call this function at the beginning of your program. This function initializes Parallel Ports A through G for use with the RCM3700 Prototyping Board or the RCM3720 Prototyping Board.

The

brdInit

at compile time:

• Any RCM3700 RabbitCore module (except the RCM3720) will have its I/O ports configured for an RCM3700 Prototyping Board.

• An RCM3720 RabbitCore module will have its I/O ports configured for an RCM3720 Prototyping Board.

• To run an RCM3720 RabbitCore module on an RCM3700 Prototyping Board, add the following macro at the top of the program you will be running.

#define RCM3700_PROTOBOARD

Sample programs that are specifically designed for the RCM3700 Prototyping Board already ha ve this macro included. When you run a sample program designed for the RCM3700 Prototyping Board on an RCM3720, a warning message will be displayed to inform you of that. You can disable the warning by commenting out the line indicated by the compiler.

• To run an RCM3700 RabbitCore module (other than the RCM3720) on an RCM3720 Prototyping Board, add the following macro at the top of the program you will be running.

#define RCM3720_PROTOBOARD

Summary of Initialization

1. I/O port pins are configured for Prototyping Board operation.

2. Unused configurable I/O are set as tied inputs or outputs.

3. The LCD/keypad module is disabled.

4. RS-485 is not enabled.

5. RS-232 is not enabled.

6. The IrDA transceiver is disabled.

7. LEDs are off.

8. The A/D converter is reset and SCLKB is to 57,600 bps (RCM3700 Prototyping Board only).

9. The A/D converter calibration constants are read (this function cannot run in RAM) (RCM3700 Prototyping Board only).

10. Ethernet select is disabled.

11. Serial flash select is disabled.

function is set up to a default I/O configuration based on the RabbitCore module detected

CAUTION: Pin PB7 is connected as both switch S2 and as an external I/O bus on the RCM3700

Prototyping Board. Do not use S2 when the LCD/keypad module is installed.

CAUTION: Pins PC1 and PG2 are tied together, and pins PC3 and PG3 are tied together on the

RCM3700 RabbitCore module. Both pairs of pins are connected to the IrDA transceiver and to the RS-232 transceiver via serial ports on the RCM3700 Prototyping Board. Do not enable both transceivers on the RCM3700 Prototyping Board at the same time.

RETURN VALUE

None.

RabbitCore RCM3700 User’s Manual 41

5.2.2 Analog Inputs

NOTE: The function calls for the A/D converter in this section will work only with the

RCM3700 Prototyping Board.

unsigned int anaInConfig(unsigned int

instructionbyte, unsigned int cmd, long baud);

Use this function to configure the ADS7870 A/D converter. This function will address the ADS7870 in Register Mode only, and will return error if you try the Direct Mode. Section B.1.5 provides additional addressing and command information for the ADS7870 A/D converter.

ADS7870 Signal ADS7870 State RCM3700 Function/State

LN0 Input AIN0 LN1 Input AIN1 LN2 Input AIN2 LN3 Input AIN3 LN4 Input AIN4 LN5 Input AIN5 LN6 Input AIN6 LN7 Input AIN7

/RESET Input Board reset device

RISE/FALL Input Pulled up for SCLK active on rising edge

PIO0 Input Pulled down PIO1 Input Pulled down PIO2 Input Pulled down PIO3 Input Pulled down

CONVERT Input Pulled down

BUSY Output PD1 pulled down; logic high state converter is busy

CCLKCNTRL Input Pulled down; 0 state sets CCLK as input

CCLK Input Pulled down; external conversion clock

SCLK Input PB0; serial data transfer clock

SDI Input PD4; 3-wire mode for serial data input

SDO Output PD5; serial data output /CS driven

/CS Input PD2 pulled up; active-low enables serial interface

BUFIN Input Driven by VREF; reference buffer amplifier

VREF Output Connected to BUFIN

BUFOUT Output VREF output

RabbitCore RCM3700 User’s Manual 42

PARAMETERS

instructionbyte

is the instruction byte that will initiate a read or write operation at 8 or 16 bits on

the designated register address. For example,

checkid = anaInConfig(0x5F, 0, 9600); // read ID and set baud rate

cmd

refers to the command data that configure the registers addressed by the instruction byte. Enter 0 if

you are performing a read operation. For example,

i = anaInConfig(0x07, 0x3b, 0); // write ref/osc reg and enable

baud

is the serial clock transfer rate of 9600 to 57,600 bps.

baud

must be set the first time this functi on

is called. Enter 0 for this parameter thereafter, for example,

anaInConfig(0x00, 0x00, 9600); // resets device and sets baud

RETURN VALUE

0 on write operations, data value on read operations

SEE ALSO

anaInDriver, anaIn, brdInit

RabbitCore RCM3700 User’s Manual 43

unsigned int anaInDriver(unsigned int cmd,

unsigned int len);

Reads the voltage of an analog input channel by serial-clocking an 8-bit command to the ADS7870 A/D converter by the Direct Mode method. This function assumes that Mode1 (most significant byte first) and the A/D converter oscillator have been enabled. See

The conversion begins immediately after the last data bit has been transferred. An exception error will occur if Direct Mode bit D7 is not set.

PARAMETERS

cmd contains a gain code and a channel code as follows.

D7—1; D6–D4—Gain Code; D3–D0—Channel Code

Use the following calculation and the tables below to determine cmd:

cmd = 0x80 | (gain_code*16) + channel_code

Gain Code Multiplier

0x1 1x2 2x4 3x5

anaInConfig()

for the setup.

4x8 5x10 6x16 7x20

Channel Code

Differential Input

Lines

Channel Code

Single-Ended

Input Lines

0 +AIN0 -AIN1 8 AIN0 AIN0* 1 +AIN2 -AIN3 9 AIN1 AIN1* 2 +AIN4 -AIN5 10 AIN2 AI N2*

†

+AIN6 -AIN7 11 AIN3 AIN3

4 -AIN0 +AIN1 12 AIN4 A IN4 5 -AIN2 +AIN3 13 AIN5 A IN5 6 -AIN4 +AIN5 14 AIN6 A IN6

7* -AIN6 +AIN7 15 AIN7 AIN7*

* Negative input is ground. † Not accessible on RCM3700 Prototyping Board

4–20 mA

Lines

len, the output bit length, is always 12 for 11-bit conversions

RETURN VALUE

RabbitCore RCM3700 User’s Manual 44

A value corresponding to the voltage on the analog input channel:

0–2047 for 11-bit conversions (bit 12 for sign)

-1 overflow or out of range

-2 conversion incomplete, busy bit timeout

SEE ALSO

anaInConfig, anaIn, brdInit

RabbitCore RCM3700 User’s Manual 45

unsigned int anaIn(unsigned int channel,

int opmode, int gaincode);

Reads the value of an analog input channel using the direct method of addressing the ADS7870 A/D converter. The A/D converter is enabled the first time this function is called—this will take approximately 1 second to ensure that the A/D converter capacitor is fully charged.

PARAMETERS

channel opmode

is the channel number (0 to 7) corresponding to ADC_IN0 to ADC_IN7

is the mode of operation:

SINGLE DIFF mAMP

—single-ended input —differential input —4–20 mA input

channel SINGLE DIFF mAMP

0 +AIN0 +AIN0 -AIN1 1 +AIN1 +AIN1 -AIN0* +AIN1*

2 +AIN2 +AIN2 -AIN3 +AIN2* 3 +AIN3 +AIN3 -AIN2* +AIN3 4 +AIN4 +AIN4 -AIN5 +AIN4 5 +AIN5 +AIN5 -AIN4* +AIN5 6 +AIN6 +AIN6 -AIN7* +AIN6 7 +AIN7 +AIN7 -AIN6* +AIN7*

+AIN0

* Not accessible on RCM3700 Prototyping Board.

gaincode is the gain code of 0 to 7

Gain Code Multiplier

0 x1 0–20 1 x2 0–10 2x4 0–5 3x5 0–4 4 x8 0–2.5 5 x10 0–2 6 x16 0–1.25 7 x20 0–1

* Applies to RCM3700 Prototy ping Board.

Voltage Range

(V)

RabbitCore RCM3700 User’s Manual 46

RETURN VALUE

A value corresponding to the voltage on the analog input channel:

0–2047 for 11-bit A/D conversions (signed 12th bit)

ADOVERFLOW

(defined macro = -4096) if overflow or out of range

-4095 if conversion is incomplete or busy-bit timeout

SEE ALSO

anaIn, anaInConfig, anaInDriver

RabbitCore RCM3700 User’s Manual 47

int anaInCalib(int channel, int opmode,

int gaincode, int value1, float volts1, int value2, float volts2);

Calibrates the response of the desired A/D converter channel as a linear function using the two conversion points provided. Four values are calculated and placed into global tables to be later stored into simulated EEPROM using the function voltage offset.

PARAMETERS

channel is the analog input channel number (0 to 7) corresponding to ADC_IN0 to ADC_IN7 opmode is the mode of operation:

SINGLE—single-ended input DIFF—differential input mAMP—milliamp input

channel SINGLE DIFF mAMP

0 +AIN0 +AIN0 -AIN1 1 +AIN1 +AIN1 -AIN0* +AIN1*

2 +AIN2 +AIN2 -AIN3 +AIN2* 3 +AIN3 +AIN3 -AIN2* +AIN3 4 +AIN4 +AIN4 -AIN5 +AIN4 5 +AIN5 +AIN5 -AIN4* +AIN5 6 +AIN6 +AIN6 -AIN7* +AIN6 7 +AIN7 +AIN7 -AIN6* +AIN7*

anaInEEWr()

. Each channel will have a linear constant and a

+AIN0

* Not accessible on RCM3700 Prototyping Board.

gaincode is the gain code of 0 to 7

Gain Code Multiplier

0 x1 0–20 1 x2 0–10 2x4 0–5 3x5 0–4 4 x8 0–2.5 5 x10 0–2 6 x16 0–1.25 7 x20 0–1

* Applies to RCM3700 Prototy ping Board.

Voltage Range

(V)

RabbitCore RCM3700 User’s Manual 48

value1 is the first A/D converter channel value (0–2047) volts1 is the voltage or current corresponding to the first A/D converter channel value (0 to +20 V or

4 to 20 mA)

value2 is the second A/D converter channel value (0–2047) volts2 is the voltage or current corresponding to the first A/D converter channel value (0 to +20 V or

4 to 20 mA)

RETURN VALUE

0 if successful.

-1 if not able to make calibration constants.

SEE ALSO

anaIn, anaInVolts, anaInmAmps, anaInDiff, anaInCalib, brdInit

RabbitCore RCM3700 User’s Manual 49

float anaInVolts(unsigned int channel,

unsigned int gaincode);

Reads the state of a single-ended analog input channel and uses the calibration constants previously set using

anaInCalib

PARAMETERS

channel is the channel number (0–7)

to convert it to volts.

Channel Code

0 +AIN0 0–20 1 +AIN1 0–20 2 +AIN2 0–20 3 +AIN3 0–20 4 +AIN4 0–20 5 +AIN5 0–20 6 +AIN6 0–20

7+AIN7

* Negative input is ground. † Applies to RCM3700 Prototy ping Board. ‡ Used for thermistor in sample program.

gaincode is the gain code of 0 to 7

Gain Code Multiplier

0 x1 0–20

Single-Ended

Input Lines

Voltage Range

(V)

‡

0–2

Voltage Range

(V)

†

RETURN VALUE

A voltage value corresponding to the voltage on the analog input channel. ADOVERFLOW (defined macro = -4096) if overflow or out of range.

SEE ALSO

anaInCalib, anaIn, anaInmAmps, brdInit

RabbitCore RCM3700 User’s Manual 50

1 x2 0–10 2x4 0–5 3x5 0–4 4 x8 0–2.5 5 x10 0–2 6 x16 0–1.25 7 x20 0–1

* Applies to RCM3700 Prototy ping Board.

float anaInDiff(unsigned int channel,

unsigned int gaincode);

Reads the state of differential analog input channels and uses the calibration constants previously set using

anaInCalib

PARAMETERS

channel is the analog input channel number (0 to 7) corresponding to ADC_IN0 to ADC_IN7

to convert it to volts.

channel DIFF

0 +AIN0 -A IN1 1 +AIN1 -A IN0 —

2 +AIN2 -A IN3 -20 to +20* 3 +AIN3 -A IN2 — 4 +AIN4 -A IN5 -20 to +20* 5 +AIN5 -A IN4 — 6 +AIN6 -A IN7 — 7 +AIN7 -A IN6 —

* Applies to RCM3700 Prototy ping Board.

gaincode is the gain code of 0 to 7

Gain Code Multiplier

0 x1 0–20 1 x2 0–10 2x4 0–5

Voltage Range

(V)

-20 to +20

Voltage Range

(V)

RETURN VALUE

A voltage value corresponding to the voltage on the analog input channel. ADOVERFLOW (defined macro = -4096) if overflow or out of range.

SEE ALSO

anaInCalib, anaIn, anaInmAmps, brdInit

RabbitCore RCM3700 User’s Manual 51

3x5 0–4 4 x8 0–2.5 5 x10 0–2 6 x16 0–1.25 7 x20 0–1

* Applies to RCM3700 Prototy ping Board.

float anaInmAmps(unsigned int channel);

Reads the state of an analog input channel and uses the calibration constants previously set using

anaInCalib

PARAMETERS

channel is the channel number (0–7)

to convert it to current.

Channel Code

4–20 mA

Input Lines

0+AIN0 1+AIN1 2+AIN2

+AIN3

†

4+AIN4* 5+AIN5* 6+AIN6* 7+AIN7

* Negative input is ground. † Applies to RCM3700 Prototyp-

ing Board.

RETURN VALUE

A current value between 4.00 and 20.00 mA corresponding to the current on the analog input channel. ADOVERFLOW (defined macro = -4096) if overflow or out of range.

SEE ALSO

anaInCalib, anaIn, anaInVolts

RabbitCore RCM3700 User’s Manual 52

root int anaInEERd(unsigned int channel,

unsigned int opmode, unsigned int gaincode);

Reads the calibration constants, gain, and offset for an input based on their designated position in the simulated EEPROM area of the flash memory, and places them into global tables for analog inputs. The constants are stored in the top 2K of the reserved user block memory area 0x1C00–0x1FFF. Depending on the flash size, the following macros can be used to identify the starting address for these locations.

ADC_CALIB_ADDRS, address start of single-ended analog input channels ADC_CALIB_ADDRD, address start of differential analog input channels ADC_CALIB_ADDRM, address start of milliamp analog input channels

NOTE: This function cannot be run in RAM.

PARAMETER

channel is the analog input channel number (0 to 7) corresponding to ADC_IN0 to ADC_IN7 opmode is the mode of operation:

SINGLE—single-ended input line DIFF—differential input line mAMP—milliamp input line

channel SINGLE DIFF mAMP

0 +AIN0 +AIN0 -AIN1 1 +AIN1 +AIN1 -AIN0* +AIN1*

2 +AIN2 +AIN2 -AIN3 +AIN2* 3 +AIN3 +AIN3 -AIN2* +AIN3 4 +AIN4 +AIN4 -AIN5 +AIN4 5 +AIN5 +AIN5 -AIN4* +AIN5 6 +AIN6 +AIN6 -AIN7* +AIN6 7 +AIN7 +AIN7 -AIN6* +AIN7*

+AIN0

ALLCHAN read all channels for selected opmode

* Not accessible on RCM3700 Prototyping Board.

RabbitCore RCM3700 User’s Manual 53

gaincode is the gain code of 0 to 7. The gaincode parameter is ignored when channel is ALLCHAN.

RETURN VALUE

0 if successful.

-1 if address is invalid or out of range.

-2 if there is no valid ID block.

SEE ALSO

anaInEEWr, anaInCalib

Gain Code

Voltage Range

(V)

0 0–20 1 0–10 20–5 30–4 4 0–2.5 50–2 6 0–1.25 70–1

* Applies to RCM3700 Prototyping

Board.

RabbitCore RCM3700 User’s Manual 54

int anaInEEWr(unsigned int channel, int opmode

unsigned int gaincode);

Writes the calibration constants, gain, and offset for an input based from global tables to designated positions in the simulated EEPROM area of the flash memory. The constants are stored in the top 2K of the reserved user block memory area 0x1C00–0x1FFF. Depending on the flash size, the following macros can be used to identify the starting address for these locations.

NOTE: This function cannot be run in RAM.

PARAMETER

channel is the analog input channel number (0 to 7) corresponding to ADC_IN0–ADC_IN7 opmode is the mode of operation:

SINGLE—single-ended input line DIFF—differential input line

mAMP—milliamp input line

channel SINGLE DIFF mAMP

0 +AIN0 +AIN0 -AIN1

+AIN0

1 +AIN1 +AIN1 -AIN0* +AIN1* 2 +AIN2 +AIN2 -AIN3 +AIN2* 3 +AIN3 +AIN3 -AIN2* +AIN3 4 +AIN4 +AIN4 -AIN5 +AIN4 5 +AIN5 +AIN5 -AIN4* +AIN5 6 +AIN6 +AIN6 -AIN7* +AIN6 7 +AIN7 +AIN7 -AIN6* +AIN7*

ALLCHAN read all channels for selected opmode

* Not accessible on RCM3700 Prototyping Board.

RabbitCore RCM3700 User’s Manual 55

gaincode is the gain code of 0 to 7. The gaincode parameter is ignored when channel is ALLCHAN.

Gain Code

* Applies to RCM3700 Prototyping

Board.

RETURN VALUE

0 if successful

-1 if address is invalid or out of range.

-2 if there is no valid ID block.

-3 if there is an error writing to flash memory.

SEE ALSO

anaInEEWr, anaInCalib

Voltage Range

(V)

0 0–20 1 0–10 20–5 30–4 4 0–2.5 50–2 60–1.25 70–1

void digConfig(char statemask);

Configures channels PIO0 to PIO3 on the A/D converter to allow them to be used as digital I/O via header JP4 on the RCM3700 Prototyping Board.

Remember to execute the brdInit function before calling this function to prevent a runtime error.

PARAMETER

statemask is a bitwise mask representing JP4 channels 1 to 4. Use logic 0 for inputs and logic 1 for outputs in these bit positions:

bits 7–5—0 bit 4—JP4:4 bit 3—JP4:3 bit 2—JP4:2 bit 1—JP4:1 bit 0—0

RETURN VALUE

None.

SEE ALSO

digOut, digIn

RabbitCore RCM3700 User’s Manual 56

void digOut(int channel, int state);

Writes a state to a digital output channel on header JP4 of the RCM3700 Prototyping Board. The PIO0 to PIO3 channels on the A/D converter chip are accessed via header JP4 on the RCM3700 Prototyping Board.

A runtime error will occur if the brdInit function was not executed before calling this function or if the channel is out of range.

PARAMETERS

channel is channel 1 to 4 for JP4:1 to JP4:4 state is a logic state of 0 or 1

RETURN VALUE

None.

SEE ALSO

brdInit, digIn

int digIn(int channel);

Reads the state of a digital input channel on header JP4 of the RCM3700 Prototyping Board. The PIO0 to PIO3 channels on the A/D converter chip are accessed via header JP4 on the RCM3700 Prototyping Board.

A runtime error will occur if the brdInit function was not executed before calling this function or if the channel is out of range.

PARAMETERS

channel is channel 1 to 4 for JP4:1 to JP4:4 state is a logic state of 0 or 1

RETURN VALUE

The logic state of the input (0 or 1).

SEE ALSO

brdInit, digOut

RabbitCore RCM3700 User’s Manual 57

5.2.3 Digital I/O

The RCM3700 was designed to interface with other systems, and so there are no drivers written specifically for the I/O. The general Dynamic C read and write functions allow you to customize the parallel I/O to meet your specific needs. For example, use

WrPortI(PEDDR, &PEDDRShadow, 0x00);

to set all the Port E bits as inputs, or use

WrPortI(PEDDR, &PEDDRShadow, 0xFF);

to set all the Port E bits as outputs. When using the external I/O bus on the Rabbit 3000 chip, add the line

#define PORTA_AUX_IO // required to enable external I/O bus

to the beginning of any programs using the external I/O bus. The sample programs in the Dynamic C

folders provide further examples.

SAMPLES/RCM3700

and the

SAMPLES/RCM3720

RabbitCore RCM3700 User’s Manual 58

5.2.4 Serial Communication Drivers

Library files included with Dynamic C provide a full range of serial communications support. The

PACKET.LIB

RS232.LIB

library provides a set of circular-buffer-based serial functions. The

library provides packet-based serial functions where packets can be delimited by the 9th bit, by transmission gaps, or with user-defined special characters. Both libraries provide blocking functions, which do not return until they are finished transmitting or receiving, and nonblocking functions, which must be called repeatedly until they are finished, allowing other functions to be performed between calls. For more information, see the Dynamic C Function Reference Manual and Technical Note TN213, Rabbit Serial Port Software.

5.2.5 Serial Flash

The serial flash drivers are located in the

LIB\SerialFlash

folder. Complete informa-

tion on these function calls is provided in the Dynamic C Function Reference Manual.

5.2.6 TCP/IP Drivers

The TCP/IP drivers are located in the

LIB\TCPIP

folder. Complete information on these

libraries and the TCP/IP functions is provided in the Dynamic C TCP/IP User’s Manual.

RabbitCore RCM3700 User’s Manual 59

5.3 Upgrading Dynamic C

Dynamic C patches that focus on bug fixes are available from time to time. Check the Web site www.rabbit.com/support/ for the latest patches, workarounds, and bug fixes.

The default installation of a patch or bug fix is to install the file in a directory (folder) different from that of the original Dynamic C installation. Rabbit recommends using a different directory so that you can verify the operation of the patch without overwriting the existing Dynamic C installation. If you have made any changes to the BIOS or to libraries, or if you have programs in the old directory (folder), make these same changes to the BIOS or libraries in the new directory containing the patch. Do not simply copy over an entire file since you may overwrite a bug fix; of course, you may copy over any programs you have written.

5.3.1 Extras

Dynamic C installations are designed for use with the board they are included with, and are included at no charge as part of our low-cost kits.

Starting with Dynamic C version 9.60, Dynamic C includes the popular µC/OS-II realtime operating system, point-to-point protocol (PPP), F AT file system, RabbitWeb, and other select libraries. Rabbit also offers for purchase the Rabbit Embedded Security Pack featuring the Secure Sockets Layer (SSL) and a specific Advanced Encryption Standard (AES) library.

In addition to the Web-based technical support included at no extra charge, a one-year telephone-based technical support subscription is also available for purchase.

V isit our Web site at www.rabbit.com for further information and complete documentation.

5.3.1.1 Featured Application Ki t

The Secure Embedded Web Application Kit includes three Dynamic C modules that are bundled together facilitates the rapid development of secure Web browser interfaces for embedded system control.

• Dynamic C FAT file system module.

• Dynamic C RabbitWeb module.

• Dynamic C Secure Sockets Layer (SSL) module.

Appendix E provides additional information about the Secure Embedded W eb Application Kit.

RabbitCore RCM3700 User’s Manual 60

6. USING THE TCP/IP FEATURES

6.1 TCP/IP Connections

Programming and development can be done with the RCM3700 modules without connecting the Ethernet port to a network. However, if you will be running the sample programs that use the Ethernet capability or will be doing Ethernet-enabled development, you should connect the RCM3700 module’s Ethernet port at this time.

Before proceeding you will need to have the following items.

• If you don’t have Ethernet access, you will need at least a 10Base-T Ethernet card

(available from your favorite computer supplier) installed in a PC.

• Two RJ-45 straight through Ethernet cables and a hub, or an RJ-45 crossover Ethernet

cable.

The Ethernet cables and a 10Base-T Ethernet hub are available from Rabbit in a TCP/IP tool kit. More information is available at www.rabbit.com.

1. Connect the AC adapter and the programming cable as shown in Chapter 2, “Getting

Started.”

2. Ethernet Connections

There are four options for connecting the RCM3700 module to a network for development and runtime purposes. The first two options permit total freedom of action in selecting network addresses and use of the “network,” as no action can interfere with other users. We recommend one of these options for initial development.

No LAN — The simplest alternative for desktop development. Connect the RCM3700

•

module’s Ethernet port directly to the PC’s network interface card using an RJ-45 crossover cable. A crossover cable is a special cable that flips some connections between the two connectors and permits direct connection of two client systems. A standard RJ-45 network cable will not work for this purpose.

•

Micro-LAN — Another simple alternative for desktop development. Use a small

Ethernet 10Base-T hub and connect both the PC’s network interface card and the RCM3700 module’s Ethernet port to it using standard network cables.

RabbitCore RCM3700 User’s Manual 61

The following options require more care in address selection and testing actions, as conflicts with other users, servers and systems can occur:

• LAN — Connect the RCM3700 module’s Ethernet port to an existing LAN, preferably

one to which the development PC is already connected. You will need to obtain IP addressing information from your network administrator.

• WAN — The RCM3700 is capable of direct connection to the Internet and other W i de

Area Networks, but exceptional care should be used with IP address settings and all network-related programming and development. We recommend that development and debugging be done on a local network before connecting a RabbitCore system to the Internet.

TIP: Checking and debugging the initial setup on a micro-LAN is recommended before

connecting the system to a LAN or WAN.

The PC running Dynamic C does not need to be the PC with the Ethernet card.

3. Apply Power

Plug in the AC adapter. The RCM3700 module and Prototypi ng Board are now ready to be used.

RabbitCore RCM3700 User’s Manual 62

6.2 TCP/IP Primer on IP Addresses

Obtaining IP addresses to interact over an existing, operating, network can involve a number of complications, and must usually be done with cooperation from your ISP and/or network systems administrator. For this reason, it is suggested that the user begin instead by using a direct connection between a PC and the RCM3700 using an Ethernet crossover cable or a simple arrangement with a hub. (A crossover cable should not be confused with regular straight through cables.)

In order to set up this direct connection, you will have to use a PC without networking, or disconnect a PC from the corporate network, or install a second Ethernet adapter and set up a separate private network attached to the second Ethernet adapter . Disconnecting your PC from the corporate network may be easy or nearly impossible, depending on how it is set up. If your PC boots from the network or is dependent on the network for some or all of its disks, then it probably should not be disconnected. If a second Ethernet adapter is used, be aware that Windows TCP/IP will send messages to one adapter or the other, depending on the IP address and the binding order in Microsoft products. Thus you should have different ranges of IP addresses on your private network from those used on the corporate network. If both networks service the same IP address, then Windows may send a packet intended for your private network to the corporate network. A similar situation will take place if you use a dial-up line to send a packet to the Internet. Windows may try to send it via the local Ethernet network if it is also valid for that network.

The following IP addresses are set aside for local networks and are not allowed on the Internet: 10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, and 192.168.0.0 to

192.168.255.255. The RCM3700 uses a 10/100-compatible Ethernet connection with a 10Base-T interface,

which is the most common scheme. The RJ-45 connectors are similar to U.S. style telephone connectors, except they are larger and have 8 contacts.

An alternative to the direct connection using a crossover cable is a direct connection using a hub. The hub relays packets received on any port to all of the ports on the hub. Hubs are low in cost and are readily available. The RCM3700 uses 10 Mbps Ethernet, so the hub or Ethernet adapter must be either a 10 Mbps unit or a 10/100 unit that adapts to 10 Mbps.

In a corporate setting where the Internet is brought in via a high-speed line, there are typically machines between the outside Internet and the internal network. These machines include a combination of proxy servers and firewalls that filter and multiplex Internet traffic. In the configuration below , the RCM3700 could be given a fixed address so any of the computers on the local network would be able to contact it. It may be possible to configure the firewall or proxy server to allow hosts on the Internet to directly contact the controller , but it would probably be easier to place the controller directly on the external network outside of the firewall. This avoids some configuration complications by sacrificing some security.

RabbitCore RCM3700 User’s Manual 63

If your system administrator can give you an Ethernet cable along with its IP address, the

Hub(s)

Firewall

Proxy

Server

T1 in

Adapter

Ethernet

Network

RCM3700 System

Typical Corporate Network

netmask and the gateway address, then you may be able to run the sample programs without having to setup a direct connection between your computer and the RCM3700. You will also need the IP address of the nameserver, the name or IP address of your mail server, and your domain name for some of the sample programs.

RabbitCore RCM3700 User’s Manual 64

6.2.1 IP Addresses Explained

IP (Internet Protocol) addresses are expressed as 4 decimal numbers separated by periods, for example:

216.103.126.155

10.1.1.6

Each decimal number must be between 0 and 255. The total IP address is a 32-bit number consisting of the 4 bytes expressed as shown above. A local network uses a group of adja-

cent IP addresses. There are always 2N IP addresses in a local network. The netmask (also called subnet mask) determines how many IP addresses belong to the local network. The netmask is also a 32-bit address expressed in the same form as the IP address. An example netmask is:

255.255.255.0

This netmask has 8 zero bits in the least significant portion, and this means that 28 addresses are a part of the local network. Applied to the IP address above (216.103.126.155), this netmask would indicate that the following IP addresses belong to the local network:

216.103.126.0

216.103.126.1

216.103.126.2 etc.

216.103.126.254

216.103.126.255

The lowest and highest address are reserved for special purposes. The lowest address (216.102.126.0) is used to identify the local network. The highest address (216.102.126.255) is used as a broadcast address. Usually one other address is used for the address of the gateway out of the network. This leaves 256 - 3 = 253 available IP addresses for the example given.

RabbitCore RCM3700 User’s Manual 65

6.2.2 How IP Addresses are Used

The actual hardware connection via an Ethernet uses Ethernet adapter addresses (also called MAC addresses). These are 48-bit addresses and are unique for every Ethernet adapter manufactured. In order to send a packet to another computer, given the IP address of the other computer, it is first determined if the packet needs to be sent directly to the other computer or to the gateway. In either case, there is an Ethernet address on the local network to which the packet must be sent. A table is maintained to allow the protocol driver to determine the MAC address corresponding to a particular IP address. If the table is empty, the MAC address is determined by sending an Ethernet broadcast packet to all devices on the local network asking the device with the desired IP address to answer with its MAC address. In this way, the table entry can be filled in. If no device answers, then the device is nonexistent or inoperative, and the packet cannot be sent.

Some IP address ranges are reserved for use on internal networks, and can be allocated freely as long as no two internal hosts have the same IP address. These internal IP addresses are not routed to the Internet, and any internal hosts using one of these reserved IP addresses cannot communicate on the external Internet without being connected to a host that has a valid Internet IP address. The host would either translate the data, or it would act as a proxy.

Each RCM3700 RabbitCore module has its own unique MAC address, which consists of the prefix 0090C2 followed by a code that is unique to each RCM3700 module. For example, a MAC address might be 0090C2C002C0.

TIP: You can always obtain the MAC address on your board by running the sample pro-

gram DISPLAY_MAC.C from the SAMPLES\TCPIP folder.

RabbitCore RCM3700 User’s Manual 66

6.2.3 Dynamically Assigned Internet Addresses

In many instances, devices on a network do not have fixed IP addresses. This is the case when, for example, you are assigned an IP address dynamically by your dial-up Internet service provider (ISP) or when you have a device that provides your IP addresses using the Dynamic Host Configuration Protocol (DHCP). The RCM3700 modules can use such IP addresses to send and receive packets on the Internet, but you must take into account that this IP address may only be valid for the duration of the call or for a period of time, and could be a private IP address that is not directly accessible to others on the Internet. These addresses can be used to perform some Internet tasks such as sending e-mail or browsing the Web, but it is more difficult to participate in conversations that originate elsewhere on the Internet. If you want to find out this dynamically assigned IP address, under Windows 98 you can run the winipcfg program while you are connected and look at the interface used to connect to the Internet.

Many networks use IP addresses that are assigned using DHCP. When your computer comes up, and periodically after that, it requests its networking information from a DHCP server. The DHCP server may try to give you the same address each time, but a fixed IP address is usually not guaranteed.

If you are not concerned about accessing the RCM3700 from the Internet, you can place the RCM3700 on the internal network using an IP address assigned either statically or through DHCP.

RabbitCore RCM3700 User’s Manual 67

6.3 Placing Your Device on the Network

In many corporate settings, users are isolated from the Internet by a firewall and/or a proxy server. These devices attempt to secure the company from unauthorized network traffic, and usually work by disallowing traffic that did not originate from inside the network. If you want users on the Internet to communicate with your RCM3700, you have several options. You can either place the RCM3700 directly on the Internet with a real Internet address or place it behind the firewall. If you place the RCM3700 behind the firewall, you need to configure the firewall to translate and forward packets from the Internet to the RCM3700.

RabbitCore RCM3700 User’s Manual 68

6.4 Running TCP/IP Sample Programs

RCM3700

User’s PC

Ethernet crossover cable

Direct Connection

(network of 2 computers)

RCM3700

Hub

Ethernet cables

To additional network elements

Direct Connection Using a Hub

System

We have provided a number of sample programs demonstrating various uses of TCP/IP for networking embedded systems. These programs require you to connect your PC and the RCM3700 board together on the same network. This network can be a local private network (preferred for initial experimentation and debugging), or a connection via the Internet.

RabbitCore RCM3700 User’s Manual 69

6.4.1 How to Set IP Addresses in the Sample Programs

With the introduction of Dynamic C 7.30 we have taken steps to make it easier to run many of our sample programs. You will see a TCPCONFIG macro. This macro tells Dynamic C to select your configuration from a list of default configurations. You will have three choices when you encounter a sample program with the TCPCONFIG macro.

1. You can replace the TCPCONFIG macro with individual MY_IP_ADDRESS, MY_NET-

MASK

, MY_GATEWAY, and MY_NAMESERVER macros in each program.

2. You can leave TCPCONFIG at the usual default of 1, which will set the IP configurations

to 10.10.6.100, the netmask to 255.255.255.0, and the nameserver and gateway to 10.10.6.1. If you would like to change the default values, for example, to us e an IP address of 10.1.1.2 for the RCM3700 board, and 10.1.1.1 for your PC, you can edit the values in the section that directly follows the “General Configuration” comment in the TCP_CONFIG.LIB library. You will find this library in the LIB\TCPIP directory.

3. You can create a CUSTOM_CONFIG.LIB library and use a TCPCONFIG value greater

than 100. Instructions for doing this are at the beginning of the TCP_CONFIG.LIB library in the LIB\TCPIP directory.

There are some other “standard” configurations for TCPCONFIG that let you select different features such as DHCP. Their values are documented at the top of the TCP_CON-

FIG.LIB

library in the LIB\TCPIP directory. More information is available in the

Dynamic C TCP/IP User’s Manual.

RabbitCore RCM3700 User’s Manual 70

6.4.2 How to Set Up your Computer for Direct Connect

RCM3700

User’s PC

Ethernet crossover cable

IP 10.10.6.101 Netmask

255.255.255.0

Direct Connection PC to RCM3700 Board

System

Follow these instructions to set up your PC or notebook. Check with your administrator if you are unable to change the settings as described here since you may need administrator privileges. The instructions are specifically for Windows 2000, but the interface is similar for other versions of Windows.

TIP: If you are using a PC that is already on a network, you will disconnect the PC from

that network to run these sample programs. Write down the existing settings before changing them to facilitate restoring them when you are finished with the sample programs and reconnect your PC to the network.

1. Go to the control panel (Start > Settings > Control Panel), and then double-click the

Network icon.

2. Select the network interface card used for the Ethernet interface you intend to use (e.g.,

TCP/IP Xircom Credit Card Network Adapter) and click on the “Properties” button.

Depending on which version of Windows your PC is running, you may have to select the “Local Area Connection” first, and then click on the “Properties” button to bring up the Ethernet interface dialog. Then “Configure” your interface card for a “10Base-T Half-Duplex” or an “Auto-Negotiation” connection on the “Advanced” tab.

NOTE: Your network interface card will likely have a different name.

3. Now select the IP Address tab, and check Specify an IP Address, or select TCP /IP and

click on “Properties” to assign an IP address to your computer (this will disable “obtain an IP address automatically”):

IP Address : 10.10.6.101 Netmask : 255.255.255.0 Default gateway : 10.10.6.1

4. Click <OK> or <Close> to exit the various dialog boxes.

RabbitCore RCM3700 User’s Manual 71

6.5 Run the PINGME.C Sample Program

Connect the crossover cable from your computer’s Ethernet port to the RCM3700 board’s RJ-45 Ethernet connector. Open this sample program from the SAMPLES\TCPIP\ICMP folder, compile the program, and start it running under Dynamic C. When the program starts running, the green LINK light on the RCM3700 module should be on to indicate an Ethernet connection is made. (Note: If the LNK light does not light, you may not be using a crossover cable, or if you are using a hub perhaps the power is off on the hub.)

The next step is to ping the board from your PC. This can be done by bringing up the MSDOS window and running the pingme program:

ping 10.10.6.100

or by Start > R u n and typing the entry

ping 10.10.6.100

Notice that the yellow ACT light flashes on the RCM3700 module while the ping is taking place, and indicates the transfer of data. The ping routine will ping the board four times and write a summary message on the screen describing the operation.

6.6 Running Additional Sample Programs With Direct Connect

The sample programs discussed here are in the Dynamic C SAMPLES\RCM3700\TCPIP\ and the SAMPLES\RCM3720\TCPIP\ folders.

The program BROWSELED.C demonstrates how to make the RCM3700 board be a Web server. Two “LEDs” are created on the Web page, along with two buttons to toggle them. Users can change the status of the lights from the Web browser. The LEDs on the Prototyping Board match the ones on the Web page. As long as you have not modified the

TCPCONFIG 1 macro in the sample program, enter the following server address in your

Web browser to bring up the Web page served by the sample program.

http://10.10.6.100.

Otherwise use the TCP/IP settings you entered in the TCP_CONFIG.LIB library. The optional LCD/keypad module (see Appendix C) must be plugged in to the RCM3700

Prototyping Board when using this sample program. The sample program

MBOXDEMO.C

implements a W eb server that allows e-mail messages to be entered and then shown on the LCD/keypad module. The keypad allows the user to scroll within messages, flip to other e-mails, mark messages as read, and delete e-mails. When a new e-mail arrives, an LED (on the Prototyping Board and LCD/keypad module) turns on, then turns back off once the message has been marked as read. A log of all e-mail actions is kept, and can be displayed in the Web browser. All current e-mails can also be read with the Web browser.

The sample program flash LEDs DS1 and DS2 on the Prototyping Board when a ping is sent and received.

RabbitCore RCM3700 User’s Manual 72

PINGLED.C demonstrates ICMP by pinging a remote host. It will

The sample program SMTP.C allows you to send an e-mail when a switch on the Prototyping Board is pressed. Follow the instructions included with the sample program. LED DS1 on the Prototyping Board will light up when sending e-mail. Note that pin PB7 is connected to both switch S2 and to the external I/O bus on the Prototyping Board, and so switch S2 should not be used with Ethernet operations.

6.6.1 RabbitWeb Sample Programs

You will need to have the Dynamic C RabbitWeb module installed before you run the sample programs described in this section. The sample programs can be found in the SAM-

PLES\RCM3700\TCPIP\RABBITWEB

folder.

• BLINKLEDS.C—This program demonstrates a basic example to change the rate at

which the DS1 and DS2 LEDs on the RCM3700 Prototyping Board or the RCM3720 Prototyping Board blink.

• DOORMONITOR.C—The optional LCD/keypad module (see Appendix C) must be plugged

in to the RCM3700 Prototyping Board when using this sample program. This program demonstrates adding and monitoring passwords entered via the LCD/keypad module.

• HANGMAN_GAME.C—This sample program based on the children's hangman word

guessing game demonstrates some RabbitWeb capabilities using the RCM3720 Prototyping Board.

• LEDS_CHECKBOX.C—This sample program provides a bare-bones sample of using

some RabbitWeb features to control digital I/O using the RCM3720 Prototyping Board.

• SPRINKLER.C—This program demonstrates how to schedule times for the digital out-

puts in a 24-hour period using the RCM3700 Prototyping Board or the RCM3720 Prototyping Board.

• TEMPERATURE.C—This program demonstrates the use of a thermistor with the

RCM3700 Prototyping Board to measure temperature, and it also demonstrates some simple

#web variable registration along with the authentication features. An e-mail

message will be sent if the current temperature exceeds the minimum or maximum limits set by the user.

Before running this sample program, you will have to install the thermistor included in the RCM3700 Development Kit at location J7 on the RCM3700 Prototyping Board, which is connected to analog input THERM_IN7.

RabbitCore RCM3700 User’s Manual 73

6.6.2 Secure Sockets Layer (SSL) Sample Programs

You will need to have the Dynamic C SSL module installed before you run the sample programs described in this section. The sample programs can be found in the SAMPLES\

RCM3700\TCPIP\SSL

folder.

Before running these sample programs, you will have to create an SSL certificate. The SSL walkthrough in the online documentation for the Dynamic C SSL module explains how to do this.

• SSL_BROWSELED.C—This program demonstrates a basic controller running a Web

page. T wo “LEDs” are created on the Web page, along with two buttons to toggle them. Users can change the status of the lights from the Web browser. The LEDs on the Prototyping Board match the ones on the Web page. As long as you have not modified the

TCPCONFIG 1 macro in the sample program, enter the following server address in your

Web browser to bring up the Web page served by the sample program.

http://10.10.6.100

Otherwise use the TCP/IP settings you entered in the TCP_CONFIG.LIB library.

• SSL_MBOXDEMO.C—Implements a Web server that allows e-mail messages to be

entered and then shown on the LCD/keypad module. The keypad allows the user to scroll within messages, flip to other e-mails, mark messages as read, and delete e-mails. When a new e-mail arrives, an LED (on the Prototyping Board and LCD/keypad module) turns on, then turns back off once the message has been marked as read. A log of all e-mail actions is kept, and can be displayed in the Web browser. All current emails can also be read with the Web browser.

6.6.3 Dynamic C FAT File System, RabbitWeb, and SSL Modules

The Dynamic C FAT File System, RabbitWeb, and Secure Sockets Layer (SSL) modules have been integrated into a sample program for the RCM3700. The sample program requires that you have installed the Dynamic C FAT File System, RabbitWeb, and SSL modules. V isit our Web site at www.rabbit.com or contact your Rabbit sales representative or authorized distributor for further information on these Dynamic C modules.

NOTE: These sample programs will work only on the RCM3700 and the RCM3720, but

not the RCM3710. The RCM3700 RabbitCore modules do not support the download manager portion of the sample program.

TIP: Before running any of the sample programs described in this section, you should

look at and run sample programs for the TCP/IP system, RabbitWeb, SSL, the download manager, and HTTP upload to become more familiar with their operation.

ZSERVER.LIB library, the FAT file

The INTEGRATION.C sample program in the SAMPLES\RCM3700\Module_Integration and the

SAMPLES\RCM3720\Module_Integration folders demonstrate the use of the

TCP/IP ZSERVER.LIB library and FAT file system functionality with RabbitWeb dynamic HTML content, all secured using SSL. The sample program also supports dynamic updates of both the application and its resources using the Rabbit Download Manager (DLM) and HTTP upload capability, respectively—note that neither of these currently supports SSL security.

RabbitCore RCM3700 User’s Manual 74

Before you run the INTEGRATION.C sample program, you will first need to format and partition the serial flash. Find the FMT_DEVICE.C sample program in the Dynamic C

SAMPLES\FileSystem folder. Open this sample program with the File > Open menu,

then compile and run it by pressing F9. FMT_DEVICE.C formats the serial flash for use with the FAT file system. If the serial flash is already formatted, FMT_DEVICE.C gives you the option of erasing the serial flash and reformatting it with a single large partition. This erasure does not check for non-FAT partitions and will destroy all existing partitions.

Next, run the INTEGRATION_FAT_SETUP.C sample program in the Dynamic C

SAMPLES\RCM3700\Module_Integration folder . Open this sample program with the File > Open menu, then compile and run it by pressing F9. INTEGRATION_FAT_ SETUP.C

will copy some files into the FAT file system via #ximport.

The last step to complete before you can run the INTEGRATION.C sample program is to create an SSL certificate. The SSL walkthrough in the online documentation for the Dynamic C SSL module explains how to do this.

Now you are ready to run the INTEGRATION.C sample program in the Dynamic C

SAMPLES\RCM3700\Module_Integration folder . Open this sample program with the

File > Open menu, then compile and run it by pressing F9.

NOTE: Since HTTP upload and the Dynamic C SSL module currently do not work

together, compiling the INTEGRATION.C warning. Ignore the warning because we are not using HTTP upload over SSL. A macro (HTTP_UPLOAD_SSL_SUPRESS_WARNING) is available to suppress the warning message.

sample program will generate a serious

Open a Web browser, and browse to the device using the IP address from the TCP_

CONFIG.LIB

library or the URL you assigned to the device. The humidity monitor will be displayed in your Web browser. This page is accessible via plain HTTP or over SSLsecured HTTPS. Click on the administrator link to bring up the admin page, which is secured automatically using SSL with a user name and a password. Use

myadmin for user

name and use myadmin for the password. The admin page demonstrates some RabbitWeb capabilities and provides access to the

HTTP upload page. Click the upload link to bring up the HTTP upload page, which allows you to choose new files for both the humidity monitor and the admin page. If your browser prompts you again for your user name and password, they are the same as before.

Note that the upload page is a static page included in the program flash, and can only be updated by recompiling and downloading the application. This way, the page is protected so that you cannot accidentally change it, possibly restricting yourself from performing future updates. If you wish, you may place the upload page into the FAT file system to allow the upload page to be updated.

To try out the update capability, click the upload link on the admin page and choose a simple text file to replace monitor.ztm. Open another browser window and load the main Web page. You will see that your text file has replaced the humidity monitor. To

RabbitCore RCM3700 User’s Manual 75

restore the monitor, go back to the other window, click back to go to the upload page again, and choose HUMIDITY_MONITOR.ZHTML to replace monitor.ztm, and click

Upload.

When you refresh the page in your browser, you will see that the page has been restored. You have successfully updated and restored your application's files remotely!

When you are finished with the INTEGRATION.C sample program, you need to follow a special shutdown procedure before powering off to prevent any possible corruption of the F AT file system. Press and hold switch S1 on the Prototyping Board until LED DS1 blinks rapidly to indicate that it is now safe to turn the RCM3700 off. This procedure can be modified by the user to provide other application-specific shutdown tasks.

6.7 Where Do I Go From Here?

NOTE: If you purchased your RCM3700 through a distributor or through a Rabbit partner,

contact the distributor or partner first for technical support.

If there are any problems at this point:

• Use the Dynamic C Help menu to get further assistance with Dynamic C.

• Check the Rabbit Technical Bulletin Board and forums at www.rabbit.com/support/bb/

and at www.rabbit.com/forums/.

• Use the Technical Support e-mail form at www.rabbit.com/support/. If the sample programs ran fine, you are now ready to go on.

Additional sample programs are described in the Dynamic C TCP/IP User’s Manual. Please refer to the Dynamic C TCP/IP User’s Manual to develop your own applications.

An Introduction to TCP/IP provides background information on TCP/IP, and is available on the CD and on our Web site.

RabbitCore RCM3700 User’s Manual 76

APPENDIX A. RCM3700 SPECIFICATIONS

Appendix A provides the specifications for the RCM3700, and describes the conformal coating.

RabbitCore RCM3700 User’s Manual 77

A.1 Electrical and Mechanical Characteristics

Figure A-1 shows the mechanical dimensions for the RCM3700.

NOTE: All measurements are in inches followed by millimeters enclosed in parentheses.

All dimensions have a manufacturing tolerance of ±0.01" (0.2 mm).

The mounting holes shown in Figure A-1 were introduced in 2009. RCM3700 RabbitCore modules sold before 2009 do not have these mounting holes.

RabbitCore RCM3700 User’s Manual 78

Figure A-1. RCM3700 Dimensions

It is recommended that you allow for an “exclusion zone” of 0.04" (1 mm) around the

0.55

(14)

0.55

(14)

Exclusion

Zone

0.04

(1)

0.04

(1)

0.16

(4)

0.16

(4)

0.04 (1)

2.950

(74.9)

1.200 (30.5)

RCM3700 in all directions when the RCM3700 is incorporated into an assembly that includes other printed circuit boards. An “exclusion zone” of 0.16" (4 mm) is recommended below the RCM3700 when the RCM3700 is plugged into another assembly using the shortest connectors for header J1. Figure A-2 shows this “exclusion zone.”

RabbitCore RCM3700 User’s Manual 79

Figure A-2. RCM3700 “Exclusion Zone”

T able A-1 lists the electrical, mechanical, and environmental specifications for the RCM3700.

Table A-1. RabbitCore RCM3700 Specifications

Parameter RCM3700 RCM3710 RCM3720

Microprocessor Ethernet Port 10/100-compatible with 10Base-T interface, RJ-45, 2 LEDs

Flash Memory 512K 256K 512K SRAM 512K128K256K Serial Flash Memory 1Mbyte

Backup Battery

General-Purpose I/O

Additional I/O Reset

External I/O Bus

5 address lines (shared with parallel I/O lines), plus I/O read/write

Four 3.3 V CMOS-compatible ports configurable as:

Low-EMI Rabbit 3000

Connection for user-supplied backup battery

(to support RTC and SRAM)

33 parallel digital I/0 lines:

• 31 configurable I/O

• 2 fixed outputs

Can be configured for 8 data lines and

at 22.1 MHz

• 4 asynchronous serial ports (with IrDA) or

Serial Ports

• 3 clocked serial ports (SPI) plus 1 HDLC (with IrDA) or

• 1 clocked serial port (SPI) plus 2 HDLC serial ports (with IrDA)

Serial Rate Maximum asynchronous baud rate = CLK/8

A slave port allows the RCM3700 to be used as an intelligent peripheral

Slave Interface

Real-Time Clock Yes

Timers

Watchdog/Supervisor Yes

Pulse-Width Modulators

Input Capture/ Quadrature Decoder

device slaved to a master processor, which may either be another Rabbit 3000 or any other type of processor

Ten 8-bit timers (6 cascadable, 3 reserved for internal peripherals),

one 10-bit timer with 2 match registers

4 PWM output channels with 10-bit free-running counter

and priority interrupts

2-channel input capture can be used to time input signals from various port pins

• 1 quadrature decoder unit accepts inputs from external incremental

encoder modules or

• 1 quadrature decoder unit shared with 2 PWM channels

Power

Operating Temperature –40°C to +70°C Humidity 5% to 95%, noncondensing Connectors One 2 x 20, 0.1" pitch

Board Size

100 mA @ 22.1 MHz, 5 V; 78 mA @ 11.05 MHz, 5 V

4.75–5.25 V DC

1.20" × 2.95" × 0.98"

(30 mm × 75 mm × 25 mm)

RabbitCore RCM3700 User’s Manual 80

A.1.1 Headers

The RCM3700 uses one header at J1 for physical connection to other boards. J1 is a 2 × 20 SMT header with a 0.1" pin spacing.

Figure A-3 shows the layout of another board for the RCM3700 to be plugged into. These values are relative to the designated fiducial or mounting hole (reference point).

RabbitCore RCM3700 User’s Manual 81

Figure A-3. User Board Footprint for RCM3700

A.2 Bus Loading

You must pay careful attention to bus loading when designing an interface to the RCM3700. This section provides bus loading information for external devices.

Table A-2 lists the capacitance for the various RCM3700 I/O ports.

Table A-2. Capacitance of Rabbit 3000 I/O Ports

Input

I/O Ports

Parallel Ports A to G 12 14

Capacitance

(pF)

Output

Capacitance

(pF)

Table A-3 lists the external capacitive bus loading for the various RCM3700 output ports. Be sure to add the loads for the devices you are using in your custom system and verify that they do not exceed the values in Table A-3.

Table A-3. External Capacitive Bus Loading -40°C to +85°C

Output Port

All I/O lines with clock doubler enabled

Clock Speed

(MHz)

22.1 100

Maximum External

Capacitive Loading (pF)

RabbitCore RCM3700 User’s Manual 82

Figure A-4 shows a typical timing diagram for the Rabbit 3000 microprocessor external

adr

External I/O Read (one programmed wait state)

CLK

A[15:0]

External I/O Write (one programmed wait state)

CLK

A[15:0]

/IORD

valid

/BUFEN

/IOCSx

/IOWR

/BUFEN

D[7:0]

valid

setup

hold

/CSx

/IOCSx

CSx

IOCSx

IORD

BUFEN

CSx

IOCSx

IORD

BUFEN

valid

D[7:0]

/CSx

CSx

IOCSx

IOWR

CSx

IOCSx

IOWR

BUFEN

DHZV

DVHZ

I/O read and write cycles.

RabbitCore RCM3700 User’s Manual 83

NOTE: /IOCSx can be programmed to be active low (default) or active high.

Figure A-4. I/O Read and Write Cycles—No Extra Wait States

Table A-4 lists the delays in gross memory access time.

Table A-4. Data and Clock Delays VIN ±10%, Temp, -40°C–+85°C (maximum)

Clock to Address Output Delay

(ns)

VIN

30 pF 60 pF 90 pF

3.3 V 6 8 11 1 3/4.5 4.5/9

Data Setup Time Delay

(ns)

Spectrum Spreader Delay

(ns)

Normal

no dbl/dbl

Strong

no dbl/dbl

The measurements are taken at the 50% points under the following conditions.

• T = -40°C to 85°C, V = VDD ±10%

• Internal clock to nonloaded CLK pin delay  1 ns @ 85°C/3.0 V

The clock to address output delays are similar, and apply to the following delays.

• T

, the clock to address delay

adr

, the clock to memory chip select delay

CSx

, the clock to I/O chip select delay

IOCSx

, the clock to I/O read strobe delay

IORD

, the clock to I/O write strobe delay

IOWR

• T

BUFEN

The data setup time delays are similar for both T

, the clock to I/O buffer enable delay

setup

and T

hold

When the spectrum spreader is enabled with the clock doubler, every other clock cycle is shortened (sometimes lengthened) by a maximum amount given in the table above. The shortening takes place by shortening the high part of the clock. If the doubler is not enabled, then every clock is shortened during the low part of the clock period. The maximum shortening for a pair of clocks combined is shown in the table.

Technical Note TN227, Interfacing External I/O with Rabbit 2000/3000 Designs, contains suggestions for interfacing I/O devices to the Rabbit 3000 microprocessors.

RabbitCore RCM3700 User’s Manual 84

A.3 Rabbit 3000 DC Characteristics

Table A-5. Rabbit 3000 Absolute Maximum Ratings

Symbol Parameter Maximum Rating

Operating Temperature -55° to +85°C

Storage Temperature -65° to +150°C

Maximum Input Voltage:

+ 0.5 V

• Oscillator Buffer Input

• 5-V-tolerant I/O

Maximum Operating Voltage 3.6 V

5.5 V

Stresses beyond those listed in Table A-5 may cause permanent damage. The ratings are stress ratings only, and functional operation of the Rabbit 3000 chip at these or any other conditions beyond those indicated in this section is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect the reliability of the Rabbit 3000 chip.

Table A-6 outlines the DC characteristics for the Rabbit 3000 at 3.3 V over the recommended operating temperature range from TA = –55°C to +85°C, VDD = 3.0 V to 3.6 V.

Table A-6. 3.3 Volt DC Characteristics

Symbol Parameter Test Conditions Min Typ Max Units

V V

Supply Voltage 3.0 3.3 3.6 V

High-Level Input Voltage 2.0 V

Low-Level Input Voltage 0.8 V

High-Level Output Voltage

Low-Level Output Vo ltage

High-Level Input Current

(absolute worst case, all buffers)

Low-Level Input Current

(absolute worst case, all buffers)

High-Impedance State Output Current

(absolute worst case, all buffers)

= 6.8 mA,

= VDD (min)

= 6.8 mA,

= VDD (min)

VIN = VDD, V

= VDD (max)

VIN = VSS,

= VDD (max)

VIN = VDD or VSS, V

= VDD (max), no pull-up

0.7 x V

-10 µA

-10 10 µA

0.4 V

10 µA

RabbitCore RCM3700 User’s Manual 85

A.4 I/O Buffer Sourcing and Sinking Limit

Unless otherwise specified, the Rabbit I/O buffers are capable of sourcing and sinking

6.8 mA of current per pin at full AC switching speed. Full AC switching assumes a

22.1 MHz CPU clock and capacitive loading on address and data lines of less than 100 pF per pin. The absolute maximum operating voltage on all I/O is 5.5 V.

Table A-7 shows the AC and DC output drive limits of the parallel I/O buffers when the Rabbit 3000 is used in the RCM3700.

Table A-7. I/O Buffer Sourcing and Sinking Capability

Output Drive (Full AC Switching)

Pin Name

All data, address, and I/O lines with clock doubler enabled

Sourcing/Sinking

(mA)

Sourcing Sinking

6.8 6.8

Under certain conditions, you can exceed the limits outlined in Table A-7. See the Rabbit 3000 Microprocessor User’s Manual for additional information.

Limits

RabbitCore RCM3700 User’s Manual 86

A.5 Conformal Coating

Conformally coated

area

R24

C18

C34

RP1

RP2

R18

R36

C35

C19

C26

C27

C28

R15 R16

C36 C39 R13

C25

JP1

JP3

C33

C32

C30

C31

C15

C17

C20

C38

C41

R11

C37

R4 R5

C29

JP2

C40

C10

C49

C14

C12

C22

C23

C57

R31

C58

R29

DS2

R32 R30

DS1

R34

C16

R28

C24

C21

C53

R26

R33

U11

C54 C55

R27

The areas around the 32 kHz real-time clock crystal oscillator on RCM3700 RabbitCore modules without mounting holes have had the Dow Corning silicone-based 1-2620 conformal coating applied. The conformally coated area is shown in Figure A-5. The conformal coating protects these high-impedance circuits from the effects of moisture and contaminants over time. The new design used on RCM3700 RabbitCore modules with mounting holes do not need a conformal coating.

Figure A-5. RCM3700 Areas Receiving Conformal Coating

Any components in the conformally coated area may be replaced using standard soldering procedures for surface-mounted components. A new conformal coating should then be applied to offer continuing protection against the effects of moisture and contaminants.

NOTE: For more information on conformal coatings, refer to Technical Note 303, Con-

formal Coatings.

RabbitCore RCM3700 User’s Manual 87

A.6 Jumper Configurations

Figure A-6 shows the header locations used to configure the various RCM3700 options via jumpers.

Figure A-6. Location of RCM3700 Configurable Positions

RabbitCore RCM3700 User’s Manual 88

Table A-8 lists the configuration options.

Table A-8. RCM3700 Jumper Configurations

Header Description Pins Connected

1–2 Normal Mode

JP1 Flash Memory Bank Select

2–3 Bank Mode

1–2 128K–256K

JP2 SRAM Size

2–3 512K RCM3700 1–2 256K RCM3710

JP3 Flash Memory Size

2–3 512K

NOTE: The jumper connections are made using 0  surface-mounted resistors.

Factory

Default

RCM3710 RCM3720

RCM3700 RCM3720

RabbitCore RCM3700 User’s Manual 89

APPENDIX B. PROTOTYPING BOARD

Two different Prototyping Boards are available for the RCM3700 series of RabbitCore modules. The RCM3700 Prototyping Board has power-supply connections and also provides some basic I/O peripherals (RS-232, RS-485, A/D converter, IrDA transceiver, LEDs, and switches), as well as a prototyping area for more advanced hardware development. The RCM3720 Prototyping Board was designed specifically for the Ethernet Connection Kit, and only has the power-supply connections, prototyping area, LEDs, switches, and space for an optional RS-232 chip to be installed.

Either Prototyping Board may be used with the full line of RCM3700 RabbitCore modules. Appendix B describes the features and accessories for the two prototyping boards.

RabbitCore RCM3700 User’s Manual 90

RCM3700

/RESET

LDE0

LED2

LED4

LED6

GND

+BKLT

/CS

LED1

LED3

LED5

GND

D1D3D5

GND

A3A1D0D2D4D6GND

+BKLT

/CS

LED1

LED3

LED5

GND

D1D3D5

IR1

R1 R2 R3 R4

JP1

+485

GND

485

JP2

R12

R11

C10

R13

C11

GND

/IORD

PB5

PB3

PA0

PA6

PB0

/RES

+5V

PF4

PF6

PC1/PG2

PC0_TXD

PE5

PE1

PG7_RXE

PD4

VBAT

PA4 PA2

/IOWR

PE7

PB4

PB2

PA1

PA3

PA5

PA7

PB7

PF0

PF1

PF5

PF7

PE4

PE0

PD5

PG6 TXE

PC2 TXC

PC3/ PG3

GND

RXC TXC RXE

GND

C12

C13

C15

C14

C17

C18

R14

C19

DCIN

+3.3V

GND

+5V

GND

+3.3V

LCD1JB

LCD1JC

LCD1JA

C16

R15

BT1

GND

TXD

RXD

TXE

GND

TCM_SMT_SOCKET

+5V

VBAT

PD5

/IORD

PG6_TXE

PE0

PE4

PE7

PC2_TXC

PC0_TXD

PF6

PF4

PB5

PB3

PB0

PF1

PA1

PA3

PA5

PA7

GND

R16

GND

/RES

PD4

/IOWR

PE1

PE5

PC3/PG3

PF7

PF5

PB7

PB4

PB2

PF0

PA0

PA2

PA4

PA6

PG7

RXE

PC1/

PG2

C22

C26

R21

R18

C20

R19

C21

R20

R22

JP4

RP1

CX1 CX2

CX3

CX4

CX5

CX6

CX7

CX8

CX9

CX10CX11

UX2

UX1

R23

C24 C25

C23

C27 R25

R24

C28

R26

R27

R28

R29

JP8

R30 R31 R32

R33

R34

R35

R36

C35

R43

C29

THERMISTOR

R37

VREF

AGND

R44

THERM_IN

AIN

06050403020100

AIN

AGND

R38

C30

C31

C32

C33

C34

R39 R40

R41 R42

R48

DS1

DS2

R45

R49

R46

DS3

R47

S2S1

CONVERT

JP5

JP6

JP7

NCNCNC

/RSTETLED0

LED2

LED4

LED6

GNDA3A1D0D2D4D6

RCM36/37XX SERIES

PROTOTYPING BOARD

RESET

Power

Input

Power

LED

Reset

Switch

User

LEDs

RCM3700 Module Extension Header

+5 V, 3.3 V, and

GND Buses

RCM3700

Module

Connector

User

Switches

SMT Prototyping

Area

LCD/Keypad

Module

Connections

IRDA

Transceiver

Through-Hole

Prototyping Area

C53

RS-485

RS-232

Header

Analog

Inputs

Analog

Reference

Convert Ground

Backup Battery

B.1 RCM3700 Prototyping Board

The RCM3700 Prototyping Board included in the RCM3700 Development Kit makes it easy to connect an RCM3700 module to a power supply and a PC workstation for development. It also provides some basic I/O peripherals (RS-232, RS-485, A/D converter, IrDA transceiver, LEDs, and switches), as well as a prototyping area for more advanced hardware development.

For the most basic level of evaluation and development, the RCM3700 Prototyping Board can be used without modification.

As you progress to more sophisticated experimentation and hardware development, modifications and additions can be made to the board without modifying or damaging the RCM3700 module itself.

The RCM3700 Prototyping Board is shown below in Figure B-1, with its main features identified.

RabbitCore RCM3700 User’s Manual 91

Figure B-1. RCM3700 Prototyping Board

B.1.1 Features

• Power Connection—A 3-pin header is provided for connection to the power supply. Note that the 3-pin header is symmetrical, with both outer pins connected to ground and the center pin connected to the raw DCIN input. The cable of the AC adapter provided with the North American version of the Development Kit ends in a plug that connects to the power-supply header, and can be connected to the 3-pin header in either orientation. A similar header plug leading to bare leads is provided for overseas customers.

Users providing their own power supply should ensure that it delivers 7.5–30 V DC at 500 mA. The voltage regulators will get warm while in use.

• Regulated Power Supply—The raw DC voltage provided at the POWER IN powerinput jack is routed to a 5 V switching voltage regulator, then to a separate 3.3 V linear regulator. The regulators provide stable power to the RCM3700 module and the Prototyping Board.

• Power LED—The power LED lights whenever power is connected to the Prototyping Board.

• Reset Switch—A momentary-contact, normally open switch is connected directly to the RCM3700’s /RESET_IN pin. Pressing the switch forces a hardware reset of the system.

• I/O Switches and LEDs—Two momentary-contact, normally open switches are connected to the PF4 and PB7 pins of the RCM3700 module and may be read as inputs by sample applications.

RCM3700

Two LEDs are connected to the PF6 and PF7 pins of the RCM3700 module, and may be driven as output indicators by sample applications.

• Prototyping Area—A generous prototyping area has been provided for the installation of through-hole components. +3.3 V, +5 V, and Ground buses run at both edges of this area. Several areas for surface-mount devices are also available. (Note that there are SMT device pads on both top and bottom of the Prototyping Board.) Each SMT pad is connected to a hole designed to accept a 30 AWG solid wire or wire-wrap wire.

LCD/Keypad Module—Rabbit’s LCD/keypad module may be plugged in directly to

•

headers LCD1JA, LCD1JB, and LCD1JC. The signals on headers LCD1JB and LCD1JC will be available only if the LCD/keypad module is plugged in to header LCD1JA. Appendix C provides complete information for mounting and using the LCD/keypad module.

• Module Extension Headers—The complete non-analog pin set of the RCM3700 module is duplicated at header J3. Developers can solder wires directly into the appropriate holes, or, for more flexible development, a 2 × 20 header strip with a 0.1" pitch can be soldered into place. See Figure B-4 for the header pinouts.

•

Analog I/O Shrouded Headers—The complete analog pin set of the RCM3700

Prototyping Board is available on shrouded headers J8 and J9. See Figure B-4 for the header pinouts.

RabbitCore RCM3700 User’s Manual 92

RCM3700

• RS-232—Three 3-wire serial ports or one 5-wire RS-232 serial port and one 3-wire serial port are available on the Prototyping Board at header J2. A jumper on header JP2 is used to select the drivers for Serial Port E, which can be set either as a 3-wire RS-232 serial port or as an RS-485 serial port. Serial Ports C and D are not available while the IrDA transceiver is in use.

A 10-pin 0.1-inch spacing header strip is installed at J2 allows you to connect a ribbon cable that leads to a standard DE-9 serial connector.

• RS-485—One RS-485 serial port is available on the Prototyping Board at shrouded header J1. A 3-pin shrouded header is installed at J1. A jumper on header JP2 enables the RS-485 output for Serial Port E.

• IrDA—An infrared transceiver is included on the Prototyping Board, and is capable of handling link distances up to 1.5 m. The IrDA uses Serial Port F—Serial Ports C and D are unavailable while Serial Port F is in use.

• Backup Battery—A 2032 lithium-ion battery rated at 3.0 V, 220 mA·h, provides battery backup for the RCM3700 SRAM and real-time clock.

RabbitCore RCM3700 User’s Manual 93

B.1.2 Mechanical Dimensions and Layout

/RESET

LDE0

LED2

LED4

LED6

GND

+BKLT

/CS

LED1

LED3

LED5

GND

D1D3D5

GND

A3A1D0D2D4D6GND

+BKLT

/CS

LED1

LED3

LED5

GND

D1D3D5

IR1

R1 R2 R3 R4

JP1

+485

GND

485

JP2

R12

R11

C10

R13

C11

GND

/IORD

PB5

PB3

PA0

PA6

PB0

/RES

+5V

PF4

PF6

PC1/PG2

PC0_TXD

PE5

PE1

PG7_RXE

PD4

VBAT

PA4 PA2

/IOWR

PE7

PB4

PB2

PA1

PA3

PA5

PA7

PB7

PF0

PF1

PF5

PF7

PE4

PE0

PD5

PG6

TXE

PC2 TXC

PC3/ PG3

GND

RXC TXC RXE

GND

C12

C13

C15

C14

C17

C18

R14

C19

DCIN

+3.3V

GND

+5V

GND

+3.3V

LCD1JB

LCD1JC

LCD1JA

C16

R15

BT1

GND

TXD

RXD

TXE

GND

TCM_SMT_SOCKET

+5V

VBAT

PD5

/IORD

PG6_TXE

PE0

PE4

PE7

PC2_TXC

PC0_TXD

PF6

PF4

PB5

PB3

PB0

PF1

PA1

PA3

PA5

PA7

GND

R16

GND

/RES

PD4

/IOWR

PE1

PE5

PC3/PG3

PF7

PF5

PB7

PB4

PB2

PF0

PA0

PA2

PA4

PA6

PG7

RXE

PC1/

PG2

C22

C26

R21

R18

C20

R19

C21

R20

R22

JP4

RP1

CX1 CX2

CX3

CX4

CX5

CX6

CX7

CX8

CX9

CX10CX11

UX2

UX1

R23

C24 C25

C23

C27 R25

R24

C28

R26

R27

R28

R29

JP8

R30 R31 R32

R33

R34

R35

R36

C35

R43

C29

THERMISTOR

R37

VREF

AGND

R44

THERM_IN

AIN

06050403020100

AIN

AGND

R38

C30

C31

C32

C33

C34

R39 R40

R41 R42

R48

DS1

DS2

R45

R49

R46

DS3

R47

S2S1

CONVERT

JP5

JP6

JP7

/RSTETLED0

LED2

LED4

LED6

GNDA3A1D0D2D4D6

RCM36/37XX SERIES

PROTOTYPING BOARD

RESET

6.50

(165)

4.50

(114)

6.10

(155)

0.20

(5)

0.20

(5)

4.10

(104)

0.20

(5)

0.20

(5)

Figure B-2 shows the mechanical dimensions and layout for the RCM3700 Prototyping Board.

RCM3700

Figure B-2. RCM3700 Prototyping Board Dimensions

RabbitCore RCM3700 User’s Manual 94

RCM3700

LINEAR POWER

REGULATOR

POWER

10 µF

LM 1117

+3.3 V

1N5819

47 µF

330 µF

+5 V

C19

330 µH

D1 1N5819

SWITCHING POWER REGULATOR

DCIN

LM2575

10 µF

Table B-1 lists the electrical, mechanical, and environmental specifications for the RCM3700 Prototyping Board.

Table B-1. RCM3700 Prototyping Board Specifications

Parameter Specification

Board Size 4.50" × 6.50" × 0.75" (114 mm × 165 mm × 19 mm) Operating Temperature –20°C to +60°C Humidity 5% to 95%, noncondensing Input Voltage 7.5 V to 30 V DC Maximum Current Draw

(including user-added circuits)

800 mA max. for +3.3 V supply, 1 A total +3.3 V and +5 V combined

8-channel ADS7870 with programmable gain configurable for 11-bit single-ended, 12-bit differential, and 4–20 mA inputs

A/D Converter

• Input impedance 6–7 M

• A/D conversion time (including 120 µs raw count and Dynamic C) 180 µs

IrDA Transceiver HSDL-3602, link distances up to 1.5 m

Prototyping Area

2.5" × 3" (64 mm × 76 mm) throughhole, 0.1" spacing,

additional space for SMT components

Standoffs/Spacers 5, accept 4-40 × 1/2 screws

B.1.3 Power Supply

The RCM3700 requires a regulated 4.75 V to 5.25 V DC power source to operate. Depending on the amount of current required by the application, different regulators can be used to supply this voltage.

The RCM3700 Prototyping Board has an onboard +5 V switching power regulator from which a +3.3 V linear regulator draws its supply. Thus both +5 V and +3.3 V are available on the RCM3700 Prototyping Board.

The RCM3700 Prototyping Board itself is protected against reverse polarity by a Shottky diode at D2 as shown in Figure B-3.

RabbitCore RCM3700 User’s Manual 95

Figure B-3. RCM3700 Prototyping Board Power Supply

B.1.4 Using the RCM3700 Prototyping Board

GND

TxD

RxD

TxE

GND

RxC

TxC

RxE

GND

/IOWR

PE7

PB4

PB2

PA1

PA3

PA5

PA7

PB7

PF0

PF1

PF5

PF7

PC3/PG3

PC2_TxC

PE4

PE0

PG6_TxE

PD5

GND

/IORD

PB5

PB3

PA0

PA2

PA4

PA6

PB0

/RES

+5 V

PF4

PF6

PC1/PG2

PC0_TxD

PE5

PE1

PG7_RxE

PD4

VBAT

RS-485

GND

RS-485+

RCM3700

Non-Analog

Signals

RS-232

Thermistor

VREF

CONVERT

ANALOG_GND

THERM_IN7

ADC_IN6

ADC_IN5

ADC_IN4

ADC_IN3

ADC_IN2

ADC_IN1

THERM_IN0

ANALOG_GND

Analog

I/O

RS-485

The RCM3700 Prototyping Board is actually both a demonstration board and a prototyping board. As a demonstration board, it can be used to demonstrate the functionality of the RCM3700

right out of the box without any modifications.

Figure B-4 shows the RCM3700 Prototyping Board pinouts.

RCM3700

Figure B-4. RCM3700 Prototyping Board Pinout

RabbitCore RCM3700 User’s Manual 96

RCM3700

The RCM3700 Prototyping Board comes with the basic components necessary to demonstrate the operation of the RCM3700. T wo LEDs (DS1 and DS2) are connected to PF6 and PF7, and two switches (S1 and S2) are connected to PF4 and PB7 to demonstrate the interface to the Rabbit 3000 microprocessor. Reset switch S3 is the hardware reset for the RCM3700.

The RCM3700 brought out conveniently to labeled points at header J3 on the

Prototyping Board provides the user with RCM3700 connection points

RCM3700

Prototyping Board. Although header J3 is unstuffed, a 2 × 20 header is included in the bag of parts. RS-485 signals are available on shrouded header J1, and RS-232 signals (Serial Ports C, D, and E) are available on header J2. A header strip at J2 allows you to connect a ribbon cable. A shrouded header connector and wiring harness are included with the

RCM3700

Development Kit parts

to help you ac c es s t he R S- 4 85 signals on shrouded header J1. There is a 2.5" × 3" through-hole prototyping space available on the RCM3700 Prototyping

Board. GND traces run along both edges of the circuits can be prototyped using pointprototyping area, the face-mount components may be installed.

The holes in the prototyping area are spaced at 0.1" (2.5 mm).

prototyping area

for easy access.

to-point wiring with 20 to 30 AWG wire between the

+3.3 V, +5 V, and GND traces,

and the surrounding area where sur-

Small holes are provided around the surface-

+3.3 V, +5 V, and

Small to medium

mounted components that may be installed around the prototyping area.

B.1.4.1 Adding Other Components

There are two sets of pads for 28-pin devices that can be used for surface-mount prototyping SOIC devices. (Although the adjacent sets of pads could accommodate up to a 56-pin device, they do not allow for the overlap between two 28-pin devices.) There are also pads that can be used for SMT resistors and capacitors in an 0805 SMT package. Each component has every one of its pin pads connected to a hole in which a 30 AWG wire can be soldered (standard wire-wrap wire can be soldered in for point-to-point wiring on the RCM3700 Prototyping Board). Because the traces are very thin, carefully determine which set of holes is connected to which surface-mount pad.

RabbitCore RCM3700 User’s Manual 97

B.1.5 Analog Features

178 kW

ADC_IN0

AGND

+ V

ADC_IN1

VREF

178 kW

1 nF

20 kW

ADC

20 kW

1 nF

User Circuits

JP7

The RCM3700 Prototyping Board has an onboard ADS7870 A/D converter to demonstrate the interface capabilities of the Rabbit 3000. The A/D converter multiplexes converted signals from eight single-ended or three differential inputs to alternate Serial Port B on the Rabbit 3000 (Parallel Port pins PD4 and PD5).

B.1.5.1 A/D Converter Inputs

Figure B-5 shows a pair of A/D converter input circuits. The resistors form an approximately 10:1 attenuator, and the capacitor filters noise pulses from the A/D converter input.

RCM3700

Figure B-5. A/D Converter Inputs

The A/D converter chip can make either single-ended or differential measurements depending on the value of the

opmode parameter in the software function call. Adjacent

A/D converter inputs can be paired to make differential measurements. The default setup on the Prototyping Board is to measure only positive voltages for the ranges listed in Table B-2.

RabbitCore RCM3700 User’s Manual 98

Rabbit Core RCM3700 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual