Microchip Technology F1 Evaluation Platform for Enhanced PIC Microcontrollers User guide

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F1 Evaluation Platform for

Enhanced PIC® Microcontrollers

User’s Guide

 2010 Microchip Technology Inc. DS41401B

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and t he lik e is provided only for your convenience and may be su perseded by upda t es . It is y our responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life supp ort and/or safety ap plications is entir ely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless M icrochip from any and all dama ges, claims, suits, or expenses re sulting from such use. No licens es are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.

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The Microchip name and logo, the Microchip logo, dsPIC, K

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,

PIC

logo, rfPIC and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, UniWinDriver, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.

ISBN: 978-1-60932-512-1

Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

MCUs and dsPIC® DSCs, KEELOQ

code hopping

DS41401B-page 2  2010 Microchip Technology Inc.

F1 EVALUATION PLATFORM

USER’S GUIDE

Ta ble of Contents

Preface ...........................................................................................................................5

Chapter 1. F1 Evaluation Platform Overview

1.1 Introduction ................................................................................................... 11

1.2 Platform Co n te n ts ......... ................................................................................ 11

1.3 Hardware F e a tu re s ......... .. ............................................................................ 11

Chapter 2. Getting Started

2.1 Introduction ................................................................................................... 13

2.2 Powering th e F1 E va l u at io n P la tf o rm . .. ........................................................ 13

2.3 Powering w ith P ICk it™ 3 .............................................................................. 13

2.4 Powering w ith th e Co nn e c to r at JP3 ............... .. ........................................... 14

2.5 Powering w ith P ICk it™ Serial ........... .. .......................................................... 14

2.6 Powering with the BLDC Expansion Header J3 ........................................... 15

2.7 Default Fir mw a re ............ .. ................ ............................................................ 15

Chapter 3. Programming the F1 Evaluation Platform

3.1 Introduction ................................................................................................... 17

3.2 Programming/Development Tool Support ....................................................17

3.3 Hardware R e s ources .. .. .......................... ... .. ................................................. 18

Chapter 4. Demo Code

4.1 Introduction ................................................................................................... 19

4.2 I

C™ Demo ....... ............................. .............................................................. 19

4.3 LCD Demo ......... .. ........................... .. .. ..................................................... .. .. . 19

4.4 BLDC Demo ........ ............................. ............................................................ 19

4.5 Combined Demo ..........................................................................................19

Chapter 5. Hardware Libraries and Drivers

5.1 Introduction ................................................................................................... 21

5.2 I

C™ Driver ..... ............................................................................................ . 21

5.3 MCP9800 Driver ...........................................................................................21

5.4 RTCC Drive r ............. .. ....................................................... ........................... 21

5.5 LCD Drive r ......... .. ................................................................................ .. .. ..... 21

5.6 Using the I

5.7 Using the LC D dr iv e r .. .................................................................................. 24

5.8 Using the RT CC D riv e r ........ ......................................................................... 26

5.9 Using the MCP9800 Driver ...........................................................................27

C™ Driver .................................................................................. 22

Chapter 6. Troubleshooting

6.1 Introduction ................................................................................................... 29

6.2 Common Pro b le m s ......... .............................................................................. 29

 2010 Microchip Technology Inc. DS41401B-page 3

F1 Evaluation Platform User’s Guide

Chapter 7. Schematics

7.1 Introduction .................................................................................................. 31

Index .............................................................................................................................39

Worldwide Sales and Service .....................................................................................42

DS41401B-page 4  2010 Microchip Technology Inc.

F1 EVALUATION PLATFORM

USER’S GUIDE

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the p age number. The numbering convention for the DS number is “DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the document.

For the most up-to-date information on development tools, see the MPLAB Select the Help menu, and then Topics to open a list of available online help files.

IDE online help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the F1 Evaluation Platform User’s Guide. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Warranty Registration

• Recommended Reading

• The Microchip Web Site

• Development Systems Customer Change Notification Service

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the F1 Evaluation Platform User’s Guide as a development tool to emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. “F1 Evalua tio n Platform Overview ”

• Chapter 2. “Getti ng Started”

• Chapter 3. “Programmi ng the F1 Evalua tion Platform”

• Chapter 4. “Demo Code”

• Chapter 5. “Hardwa re Lib rar ies and Driver s”

• Chapter 6. “Troubleshooting”

• Chapter 7. “Schematic s”

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F1 Evaluation Platform User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic chara c ters Referenced books MPLAB

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces r epeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the tota l number of digits, R is th e radi x and n is a digit.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mut ually exclus ive arguments; an OR selection

Represents code supplied by user

IDE User’s Guide

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

DS41401B-page 6  2010 Microchip Technology Inc.

WARRANTY REGISTRATION

Please complete the enclosed Warranty Registration Card and mail it promptly. Sending in the Warranty Registration Card entitles users to receive new product updates. Interim software releases are available at the Microchip web site.

Chapter 1. F1 Evaluation Platform Overview

1.1 INTRODUCTION

Thank you for choosing the F1 Evaluation Platform. This kit allows you to begin development using the PIC16LF1937 microcontroller (MCU).

The PIC16LF1937 is the first in a family of enhanced mid-range microcontrollers. These architectural enhancements allow for more memory and faster computation than that of legacy PIC16 microcontrollers.

The PIC16F1 and PIC12F1 family of microcontrollers are a series of 8-bit microcontrollers derived from the popular PIC16 series of 8-bit PIC The F1 derivatives feature an enhanced CPU, support for extended amounts of memory, improved peripherals, and XLP low power. The F1 Evaluation Platform allows you to evaluate these features for your application in a simple, low-cost platform.

This chapter introduces the F1 Evaluation Platform:

• Platform Contents

• Hardware Features

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USER’S GUIDE

microcontrollers.

1.2 PLATFORM CONTENTS

The F1 Evaluation Platform contains the following items:

1. F1 Evaluation Platform Demo Board – www.microchip.com/

1.3 HARDWARE FEATURES

The F1 Evaluation Platform has the following hardware features:

1.3.1 PIC16LF1937

The PIC16LF1937 is a 40-pin full-featured device, including:

1. Enhanced PIC16 instruction set

2. 8K Words of Flash memory

3. 512 bytes of RAM

4. 256 bytes of EEPROM

5. 2 CCPs and 3 enhanced CCPs

6. MSSP (I

7. Enhanced USART

8. 8- and 16-bit timers

9. 32 MHz internal oscillator

10. Low-power 32 kHz crystal oscillator and

11. LCD controller.

C™, SPI)

F1Eval

1.3.2 MCP9800 I2C Temperature Sensor

The MCP9800 is a low-power, I2C temperature sensor with selectable 9 to 12 bits of output resolution.

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1.3.3 PICkit™ 3 Programming/Debug Header

The PICkit 3 is a low-cost development tool that allows programming and debugging of the PIC16LF1937 MCU using the PICkit ISCP™ header.

1.3.4 PICkit Serial Communications Header

The PICkit serial is a low-cost development tool that allows I2C, SPI and USART protocols to be monitored and debugged through a simple 6-pin connector.

1.3.5 1 Button, 1 Potentiometer, 4 LEDs

Simple applications need the basic user interface elements. The button, potentiometer and 1 LED are available for any application. The remaining 3 LEDs are shared with the 20-bit motor control expansion connector.

1.3.6 One 3.5 Digit LCD

The 3.5-digit LCD glass supplied on this board is a typical meter-type display with icons for ohms, amps, etc. The PIC16LF1937 makes controlling the LCD very simple.

1.3.7 20-pin Motor Control Expansion Connector

This connector allows the PIC16LF1937 to control an optional Sensorless BLDC add-on board (DM164130-2). The PIC16LF1937 has complete control of 3 phases so other 1, 2, or 3-phase motor topologies can also be controlled.

1.3.8 Current Monitoring Connector

To demonstrate the Extreme Low Power (XLP) features of the PIC16LF1937, a precision ammeter can be connected to the current monitoring connector. This allows your application to be easily optimized for the lowest possible current.

1.3.9 Generous Prototyping Area

Our circuits are not your circuits. A prototyping area has been provided to extend the functionality of this demo board to demonstrate the utility of the PIC16LF1937 in your application.

DS41401B-page 12  2010 Microchip Technology Inc.

F1 EVALUATION PLATFORM

Chapter 2. Getting Started

2.1 INTRODUCTION

This chapter gives instruction to get your F1 Evaluation Platform powered up and running the default demonstration. The following sections include:

• Powering the F1 Evaluation Platform

• Default Firmware

• Programming the F1 Evaluation Platform with the PICkit™ 3

• Attaching a PICkit Serial (optional)

• Measuring the current consumption

FIGURE 2-1: F1 EVALUATION PLATFORM (DM164130-1)

USER’S GUIDE

2.2 POWERING THE F1 EVALUATION PLATFORM

The PIC16LF1937 supplied with your F1 Evaluation Platform requires a supply voltage of 1.8V-3.6V. Voltages above 3.6V will degrade or damage the device. There are four ways to supply the necessary power.

1. Use PICkit 3,

2. Use the power connector at JP3,

3. Use PICkit Serial, or

4. Use the BLDC Expansion Header J3.

2.3 POWERING WITH PICkit™ 3

To power with the PICkit 3, perform the following steps:

1. Make sure a jumper or an ammeter is connected across JP2.

2. If you are using a BLDC expansion, remove the jumper at JP1.

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F1 Evaluation Platform User’s Guide

3. Configure the PICkit 3 to supply a voltage between 1.8 and 3.6V . For proper LCD

contrast, the supply should be 3.3V.

4. Attach the PICkit 3 to the PICkit ICSP™ connector at the end of the board.

5. Activate the PICkit 3 power output.

2.4 POWERING WITH THE CONNECTOR AT JP3

To power with the connector at JP3, perform the following steps:

1. Make sure a jumper or an ammeter is connected across JP2.

2. If you are using a BLDC expansion, remove the jumper at JP1.

3. Verify the supply voltage to be between 1.8 and 3.6V. For proper LCD contrast,

the supply should be 3.3V.

4. Attach the power supply to JP3.

5. Turn on the power supply.

FIGURE 2-2: POWERING WITH THE CONNECTOR AT JP3

2.5 POWERING WITH PICkit™ SERIAL

To power with the PICkit Serial, perform the following steps:

1. Make sure a jumper or an ammeter is connected across JP2.

2. If you are using a BLDC expansion, remove the jumper at JP1.

3. Configure the PICkit Serial to supply a voltage between 1.8 and 3.6V. For proper

LCD contrast, the supply should be 3.3V.

4. Attach the PICkit Serial to the PICkit Serial connector at the top corner of the

board.

5. Activate the PICkit Serial power output.

DS41401B-page 14  2010 Microchip Technology Inc.

2.6 POWERING WITH THE BLDC EXPANSION HEADER J3

The BLDC Expansion hardware contains a 3.3V linear regulator. This allows the 5-12V motor power supply to power the PIC16LF1937. J3 pin 6 is the source for the 3.3V power. To use this power perform the following steps.

1. Make sure a jumper or an ammeter is connected across JP2.

2. Insert the shorting jumper at JP1.

3. Verify that any attached PICkit 3 or PICkit serial is not supplying power.

4. Verify that there is NO power supply or shorting jumper at JP3.

5. Attach the BLDC expansion board.

6. Connect power to the BLDC expansion board.

2.7 DEFAULT FIRMWARE

The default firmware supplied with your F1 Evaluation Board Demo performs the following functions:

1. Blink LEDs

2. Measure the ambient temperature

3. Run a BLDC motor (or try to if no motor is attached)

4. Display time/temperature/pot position/motor RPM on the LCD

5. User interface with a button and pot For the latest firmware go to www.microchip.com/F1Eval

Getting Started

2.7.1 Blinking LEDs

The 4 LEDs indicate motor phase operation (D<2:4>) and the performance of the primary state machine loop (D1).

2.7.2 Measuring the Ambient Temperature

The MCP9800 is polled when in Temperature Measurement mode. The measured temperature is filtered, scaled to centigrade and displayed on the LCD.

2.7.3 BLDC Motor

One task of the demo code is to drive a BLDC motor attached to the BLDC Expansion Header. The optional BLDC Controller board (DM164130-2) is required to drive the motor. The code performs a series of forced commutation steps to attempt a sensorless motor start. If no back EMF signal is detected, the code repeats the start-up sequence. The LEDs blink at an increasing rate indicating the motor start attempts. If no motor drive hardware is attached, this pattern can repeat or it may detect a BEMF signal in the noise present on the BEMF sense inputs.

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2.7.4 LCD Display

The time, temperature, pot position and motor speed are displayed on the LCD. The LCD is a 3.5-digit multimeter display with icons for amps, volts, ohms, etc. The display uses 4 commons and 10 segment drives. The Timer1 oscillator is used to clock the display peripheral and allow the LCD to display data even in Sleep. The LCD peripheral was configured for a Type B waveform for this demo. This mode provides an interrupt when the LCD can be updated. This interrupt is not required for Type A waveforms, but the extra complexity of the interrupt allows the LCD peripheral to be used to provide the real-time clock periodic interrupt. The different waveform types are described in section

21.9 of the PIC16LF193X data sheet (DS41364). Normally, the Timer1 counter would

be used, but this timer is required for the BLDC software. Because the LCD is clocked from the 32.768 kHz crystal, the LCDIF operates at a multiple of the crystal frequency, providing a very accurate time base for the real-time clock.

2.7.5 User Interface

Due to the extreme simplicity of this board, only a single button and a single pot are available for user input. These two elements allow the user to cycle through the display elements, change the motor speed and change the time.

Pressing and releasing the button cycles through the 4 display modes:

1. Time

2. Temperature

3. Pot ADC value

4. RPM

Turning the pot will change the motor speed or set the time. If the display is showing the time, and the button is held down for 3 seconds, turning

the pot clockwise will increase the time, and counter clockwise will decrease the time. Placing the pot in the center of the range will leave the time unchanged. A feature that could be added as a simple programming exercise would be to allow the time change to be faster or slower depending upon pot position.

DS41401B-page 16  2010 Microchip Technology Inc.

F1 EVALUATION PLATFORM

USER’S GUIDE

Chapter 3. Programming the F1 Evaluation Platform

3.1 INTRODUCTION

The F1 Evaluation Platform makes extensive use of the onboard peripherals of the PIC16LF1937. This chapter provides guidance concerning the tools used for programming the F1 evaluation board and a map of the board function to I/O pin and pin function.

3.2 PROGRAMMING/DEVELOPMENT TOOL SUPPORT

The following development tools suppo rt the F1 Eval ua tion Platform:

1. PICkit™ 3

2. PICkit™ 2

3. REAL ICE™ in-circuit emulator (with adapter AC164110) The PICkit™ tools can also power the F1 Evaluation Platform, therefore, no additional

hardware is required to get started. The ICSP™ pins of the PIC16LF1937 are dedicated to the PICkit ICSP connector, eliminating interactions between the Evaluation Platform and the programmer/debugger.

If you are developing with the REAL ICE emulator, you will need the AC164110 adaptor, or the high-speed trace adaptor. These adaptors provide the inline 6 pin connector required by the PICkit ICSP programming capability interface. You will also need a power supply, please see Chapter 2. “Getting S tarted” for more on powering the F1 Evaluation Platform.

 2010 Microchip Technology Inc. DS41401B-page 17

F1 Evaluation Platform User’s Guide

3.3 HARDWARE RESOURCES

TABLE 3-1:

Pin Number Pin Name Pin Function Used Board Function

1 RC7 EUSART RX PICkit™ Serial Pin 1 2 RD4 Segment 17 LCD Pin 13, S1/S2/m/ M 3 RD5 CCP1 Output B BLDC pin 5, Phase U low drive 4 RD6 CCP1 Output C BLDC pin 9, Phase V low drive 5 RD7 Segment 20 LCD pin 14, A/V/K/Om eg a 6V 7VDD VDD VDD 8 RB0 Segment 0 LCD pin 5, RC/BATT/-/AC

9 RB1 C12IN3- BLDC pin 19, Phase V BEMF Zero Cross 10 RB2 AN8 Potentiometer 11 RB3 C12IN2- BLDC pin 17, Phase U BEMF Zero Cross 14 RB4 COM1 LCD pin 1, Common 1 15 RB5 COM2 LCD pin 2, Common 2 16 RB6 PGC PICkit 2 ICSP™ pin 5, PGC 17 RB7 PGD P ICkit 2 ICSP pin 4, PGD 18 MCLR 19 RA0 Segment 12 LCD pin 11, 1A/1F/1E/1D 20 RA1 C12IN1- BLDC pin 15, Phase W BEMF Zero Cross 21 RA2 COM3 LCD pin 3, Common 3 22 RA3 C1IN+ BLDC pin 16, BEMF Zero Cross Reference 23 RA4 Segment 4 LCD pin 8, 3B/3G/3C/3DP 24 RA5 Segment 5 LCD pin 9, 2A/2F/2E/2D 25 RE0 RE0 LED D4 and BLDC pin 3 Phase W high drive 26 RE1 RE1 LED D3 and BLDC pin 7 Phase U high drive 27 RE2 RE2 LED D2 and BLDC pin 11 Phase V high drive 28 V 29 VSS VSS VSS 30 RA7 Segment 2 LCD pin 7, 3A/3F/3E/3D 31 RA6 Segment 1 LCD pin 6, DH/RH/B-C/4DP 32 RC0 T1OSCO 32.768 kHz Crystal Drive 35 RC1 T1OSCI 32.768 kHz Crystal Drive 36 RC2 CCP1 Output A BLDC pin 1, Phase W low drive 37 RC3 MSSP SCLK MCP9800 SCLK and PICkit Serial pin 5 38 RD0 Common 4 LCD pin 4, Common 4 39 RD1 RD1 LED D1 40 RD2 RD2 Button Input 41 RD3 Segment 16 LCD pin 12, 1B/1G /1C/ 42 RC4 MSSP SDA MCP9800 SDA and PICkit Serial pin 4 43 RC5 Segment 10 LCD pin 10, 2B/2G /2C/2 DP 44 RC6 EUSART TX PICkit Serial pin 6

SS VSS VSS

MCLR PICkit ICSP Pin 1

DD VDD VDD

DS41401B-page 18  2010 Microchip Technology Inc.

4.1 INTRODUCTION

The F1 Evaluation Platform demos are located at www.microchip.com/F1Eval. The following demos are available:

1. I

C™ Demo

2. LCD Demo

3. BLDC Demo

4. Combined Demo This chapter provides an overview to the functions provided by these demos.

4.2 I2C™ DEMO

F1 EVALUATION PLATFORM

USER’S GUIDE

Chapter 4. Demo Code

The I2C demo reads the current temperature from the on-board MCP9800 I2C temperature sensor. The I converted to a PWM duty cycle and used to control the brightness of the LED D4. LED D1 toggles at approximately 10 ms.

4.3 LCD DEMO

The LCD demo adds button, potentiometer, Real-Time Clock (RTC) and LCD support to the I and to drive the LCD peripheral. An input driver is supplied to manage the button and potentiometer. A state machine now controls the major features of the demo so that the time, temperature and potentiometer value can be displayed on the LCD.

C demo. The 32.768 kHz crystal is activated to maintain the Real-Time Clock

4.4 BLDC DEMO

The BLDC demo controls a sensorless, brushless DC motor connected to the PIC16F1 BLDC Expansion board (DM164130-2). Other motors can also be driven by making appropriate modifications to the motor control parameters in the source code.

Refer to application note AN1305, “Sensorless 3-Phase Brushless Motor Control with the PIC16FXXX” for detailed information regarding BLDC motor control.

4.5 COMBINED DEMO

The combined demo combines all the software from all the previous demos to show the power of the PIC16LF1937. In this demo, the BLDC motor is seamlessly controlled while displaying the time, temperature, potentiometer position or motor RPM/10. All drivers are reused from the previous demos. The RTCC is driven from the LCD peripheral.

The combined demo is preprogrammed in the F1 Evaluation Platform.

C driver is used to extract the data. The resulting value is

 2010 Microchip Technology Inc. DS41401B- page 19

F1 Evaluation Platform User’s Guide

NOTES:

DS41401B-page 20  2010 Microchip Technology Inc.

Chapter 5. Hardware Libraries and Drivers

5.1 INTRODUCTION

All of the demo code uses a common set of libraries to provide I2C, real-time clock, MCP9800 and LCD services. These libraries may be useful for other applications so they are documented here. These drivers are located at www.microchip.com/F1Eval

5.2 I2C™ DRIVER

The I2C driver allows I2C requests to be queued and then handled either by interrupts or by polling. The driver is configured during compilation to support polling or interrupts.

The I

C and LCD demos configure the driver for interrupt mode. The Combined demo

polls the I

5.3 MCP9800 DRIVER

The MCP9800 driver uses the I2C driver to get the current temperature. The mcp9800_get_temp function is fully blocking, so once a request is queued, the driver polls the I interrupts, the mcp9800_get_temp function repeatedly calls the I2C_handler function to process all the I mcp9800_get_temp function simply inserts an I2C_TRANSACTION_T into the I transaction queue and waits for the transaction to complete.

F1 EVALUATION PLATFORM

USER’S GUIDE

C handler within the MCP9800 driver.

C subsystem until the data is complete. If the I2C driver is operating without

C events. If the I2C driver is operating with interrupts, the

5.4 RTCC DRIVER

A software RTCC is managed by the supplied RTCC driver. This driver implements the time() function required by the C compiler. Time is internally kept as seconds since January 1, 1970. Standard C functions can be used to convert the time to the current date. This driver has two modes. In the first mode, it expects to be called once per second by the Timer1 interrupt. In the second mode, it expects to be called on every LCD mode B frame. This allows the RTCC to keep accurate time even if Timer1 is being used by some other function, such as the BLDC motor driver.

5.5 LCD DRIVER

The LCD driver contains the initialization code required for the LCD peripheral and the mapping code required to control the 3.5-digit LCD supplied with this demo board. It is a good starting point for the LCD driver your unique application will require.

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5.6 USING THE I2C™ DRIVER

The supplied software includes an I2C Master mode driver with the following features:

1. Interrupt driven or polled

2. Queued requests

3. Minimum memory requirements

4. Uses Restart to maximize bus bandwidth

5. Multiple atomic I

6. Completion flag for each queued block of I

5.6.1 I2C Data Structures

Two data structures are defined to simplify interactions with the I2C driver.

5.6.1.1 I2C_RESULTS_T The I2C_RESULTS_T is an enumerated type with the following enumerations:

TABLE 5-1: I2C_RESULTS_T

I2C_REQUEST_PENDING Request is in the queue or in pro cess but it is not

I2C_REQUEST_COMPLETE The request is finished successfully. I2C_REQUEST_STUCK_START The request was aborted. The start condition did

I2C_REQUEST_ADDRESS_NO_ACK The request was aborted. No ACK occurred on

I2C_REQUEST_DATA_NO_ACK The request was aborted. Not all of the data

I2C_REQUEST_LOST_STATE The I

The data completion flag for an I be I2C_REQUEST_PENDING until the request is complete. If the request completed without errors, the value will be I2C_REQUEST_COMPLETE. If there were errors, the value will reflect one of the other 4 error conditions.

C transactions allowed at each queue entry

C request is of type I2C_RESULTS_T. This flag will

C commands.

done.

not clear correctly.

the address, so the target device must not exist or is not functioning.

could be sent because the device did not ACK a byte.

C state machine had a RAM corruption and the default case caught the failure. This will infinite loop so you should never see it.

5.6.1.2 I2C_T The I2C_T is a structure representing one transaction on the I

C bus. A transa ction

contains the following elements:

1. A 7- or 10-bit address. Address type is determined automatically by the driver. R/W mode is implicit in the address and specified by bit 0.

2. An 8-bit baud rate. This is the value placed in SPADD. Predefined constants are included that compute the SPADD value given an FOSC value. Set FOSC with a #define before #including the I2C.h file.

3. A buffer_length. This is the number of bytes available for reading or writing at the supplied data buffer.

4. A Buffer Pointer. Your application will allocate a block of memory for an I

C transaction. Pass a pointer to this block via the Buffer Pointer. The block must remain valid until the transaction is complete (i.e., if you allocate the block as a non-static array within a function, you must not leave the function until the I

transaction is complete or the array may be reused by a different function).

DS41401B-page 22  2010 Microchip Technology Inc.

Hardware Libraries and Drivers

initialize() { i2c_init(I2C_400K); }

Send_data() {

I2C_TRANSACTION_REQUEST_BLOCK trb_list[5]; I2C_RESULTS flag; … populate the trb’s …

i2c_insert(5,trb_list, &flag);

}

Send_one_byte() {

I2C_TRANSACTION_REQUEST_BLOCK trb_list; unsigned char data; I2C_RESULTS flag;

data_block = .. my data byte ..

i2c_build_write_trb(&trb_list,ADDRESS, 1, &data, i2c_200K);

i2c_insert(1,&trb,&flag);

}

5.6.2 I2C Function Interface

5.6.2.1 i2c_init The function i2c_init configures the I

transaction in the transaction queue.

FIGURE 5-1:

5.6.2.2 i2c_insert The function i2c_insert places one complete set of Transaction Request Block

(TRB’s). TRBs can be bundled into an array of multiple TRBs and inserted as one large request. The driver will ensure that all the TRBs in the list will be processed sequentially

with I

C restarts separating them.

FIGURE 5-2:

C driver and makes it ready to receive

 2010 Microchip Technology Inc. DS41401B-page 23

5.6.2.3 i2c_build_write_trb / i2c_build_read_trb The i2c_build_write_trb and i2c_build_read_trb functions are helpers to

assemble the I2C_TRANSACTION_REQUEST_BLOCKS from passed parameters.

FIGURE 5-3:

5.6.2.4 i2c_write_block / i2c_read_block The i2c_write_block and i2c_read_block functions are helpers that assemble

a TRB, insert it into the queue and wait for the transaction to complete.

F1 Evaluation Platform User’s Guide

Send_one_byte() {

unsigned char data; i2c_write_block(ADDRESS, 1, &data, i2c_200K);

}

Interrupt_service_routine() {

i2c_handler();

}

typedef union {

UINT16 val; struct {

unsigned digit0 : 4; unsigned digit1 : 4; unsigned digit2 : 4; unsigned digit3 : 4;

};

} BCD_TYPE;

FIGURE 5-4:

5.6.2.5 i2c_handler The i2c_handler function must be called for each I

function can be placed into the Interrupt Service Routine for your application or, you can simply poll it often. If the i2c_write_block or i2c_read_block functions are used when the driver is configured for polling, then this function will repeatedly be called until the transaction completes.

FIGURE 5-5:

5.7 USING THE LCD DRIVER

C state to be handled. This

The supplied LCD driver configures the LCD module for the I/O pins used by the F1 Evaluation Platform. Icon definitions are provided to simplify the software. A BCD to 7-segment display mapping function is also provided to further simplify control of the LCD glass. For more information concerning the LCD peripheral, please consult the LCD chapter in the PIC16LF1937 data sheet (DS41364).

5.7.1 LCD Data Structur es

5.7.1.1 BCD_TYPE T o simplify BCD to the 7-segment display ma pping, a BCD segment dat a type has been

provided. This data type is simply four 4-bit fields representing digits 0, 1, 2 and 3.

FIGURE 5-6:

DS41401B-page 24  2010 Microchip Technology Inc.

Simply place the number you want displayed in each digit position and call lcd_display_digits. Digit 3 is the Most Significant ½ digit of the 3.5-digit LCD glass. Therefore, the largest value displayable is 1FFF assuming hexidecimal digits or 1999 for decimal digits.

Hardware Libraries and Drivers

System_initialize() {

lcd_init();

}

void display_int(int t) {

BCD_TYPE bcd;

bcd.digit0 = t %10; t /= 10; bcd.digit1 = t % 10; t /= 10; bcd.digit2 = t % 10; t /= 10; bcd.digit3 = t%10; lcd_display_digits(bcd);

}

void update_blinking() {

if(time(0) % 2) // if an odd number of seconds {

lcd_display_on(); } else {

lcd_display_off(); }

}

5.7.2 LCD Function Interface

5.7.2.1 lcd_init This function configures the LCD peripheral for this board and this glass. Type B

waveforms are used to allow the LCD peripheral to be used for the real-time clock function. The Timer1 oscillator is configured as the LCD clock source.

FIGURE 5-7:

5.7.2.2 lcd_display_digits This function accepts a BCD_TYPE variable and maps each digit to the correct

segments. Mapping the segments is done in two stages. First, the digit is converted to the correct 7-segment mapping. Then, the 7-segment mapping is converted to the actual glass segments with a long series of “if-else” statements. This function will need extensive work in the “if-else” statements for applications driving different glass.

FIGURE 5-8:

5.7.2.3 lcd_display_on / lcd_display_off These two functions simply turn the LCD peripheral off. The Timer1 oscillator is left

running. One use for these functions is to implement display blinking.

FIGURE 5-9:

 2010 Microchip Technology Inc. DS41401B-page 25

F1 Evaluation Platform User’s Guide

void display_volts(int v) {

display_int(v); DP3 = 0; DP2 = 0; S1 = 0; S2 = 0; AMPS = 0; VOLT = 1; KILO = 0; OHMS = 0; if (v < 0)

MINUS = 1;

else

MINUS = 0;

}

5.7.3 LCD Segment Definitions

FIGURE 5-10: LCD DISPLAY

There are many segments present on the F1 Evaluation Platform LCD. To access these segments, simply set the supplied #defines to ‘1’ or ‘0’.

5.8 USING THE RTCC DRIVER

DS41401B-page 26  2010 Microchip Technology Inc.

FIGURE 5-11:

The RTC driver simply keeps track of seconds. The power-up initial value is ‘0’, however a function (rtcc_set) is provided to change that value. T o keep the seconds up-to-date, the function, rtcc_handler, must be called more frequently than the defined value of CLOCKS_PER_SECOND. There are two options for the RTCC driver. The first option is to use the Timer1 counter to provide a 1 Hz interrupt (CLOCKS_PER_SECOND = 1). The second option is to use the LCD write-allowed interrupt flag to provide a 128 Hz event (CLOCKS_PER_SECOND = 128). The two choices are selected by defining use_lcdif or undefining use_lcdif.

5.8.1 RTCC Function Interface

5.8.1.1 rtcc_init Intialize the RTCC function including Timer1, if required.

Hardware Libraries and Drivers

System_initialization() {

rtcc_init();

}

System_interrupt_service_routine() {

If(TMR1IF & TMR1IE) {

TMR1IF = 0; rtcc_handler();

}

#include <time.h> Time_set() // set the time & date to 1 second after midnight, July 4, 2009 {

struct tm time_str; time_t unix_time; time_str.tm_year = 2009; // the year time_str.tm_mon = 7; // the month time_str.tm_mday = 4; // the day of the month time_str.tm_hour = 0; // the hour (0-23) time_str.tm_min = 0; // the minutes time_str.tm_sec = 1; // the seconds time_str.tm_isdst = -1; // daylight savings time modifier

unix_time = mktime(&time_str); rtcc_set(unix_time);

}

FIGURE 5-12:

5.8.1.2 rtcc_handler The rtcc_handler function must be called frequently to keep the internal seconds

counter accurate.

FIGURE 5-13:

5.8.1.3 rtcc_set After system initialization, the seconds counter is cleared to ‘0’. The standard C

libraries equate 0 seconds to Midnight, Jan 1, 1970. That time has expired a long time ago, so a new time in seconds can be configured with rtcc_set().

FIGURE 5-14:

5.8.1.4 time

5.9 USING THE MCP9800 DRIVER

 2010 Microchip Technology Inc. DS41401B-page 27

The standard C libraries require the application to supply the time function. This function returns the current time_t value or loads a supplied time_t value. The interrupts are saved and restored to make this function safe for use with interrupt driven code.

The MCP9800 is an I2C temperature sensor. The MCP9800 driver provides a simple interface to the features in the sensor.

F1 Evaluation Platform User’s Guide

System_init() {

i2c_init(); mcp9800_init();

}

Thermostat() {

int temperature; temperature = mcp9800_get_temp(); if(temperature > 260) {

turn_on_air_conditioner();

}

5.9.1 MCP9800 Function Interface

5.9.1.1 mcp9800_init This function configures the MCP9800 for 12-bit temperature, Continuous Conversion

mode. In this mode, the temperature is always ready to be read from the I

C interfac e.

FIGURE 5-15:

5.9.1.2 mcp9800_get_temp This function reads the current temperature and scales the result to degrees C * 10.

(24.3C is returned 243)

FIGURE 5-16:

DS41401B-page 28  2010 Microchip Technology Inc.

Chapter 6. Troubleshooting

6.1 INTRODUCTION

There may come a time when you need to determine why your F1 Evaluation Platform is not performing correctly. This chapter lists a few of the problems that can prevent proper operation.

6.2 COMMON PROBLEMS

6.2.1 The board will not power up

Make sure there is no shorting jumper at JP3. Then, go back and review Chapter

2. “Getting Started” of this manual.

6.2.2 LCD is blank, but everything else works

The demo code in supplied with the F1 Evaluation Platform uses the Timer1 oscillator to drive the LCD. If the Timer1 oscillator is not oscillating, the LCD will remain blank. Here are some steps to assure that the Timer1 oscillator is working properly.

1. Clean and dry the board especially around the components at the top right corner of the PIC16LF1937.

2. Make sure no foreign material is shorting the crystal leads.

3. If you are using the RC0 and RC1 pins for some other function, you should modify lcd_init to reconfigure the LCD peripheral for a different clock source.

The Timer1 oscillator of the PIC16LF1937 is a very low-power design that can be easily disrupted by stray leakage. In an actual application, Microchip recommends that the crystal circuit be conformal coated to prevent leakage. Please review Application Note AN1288, “Design Practices for Low-Power External Oscillators” for more information.

F1 EVALUATION PLATFORM

USER’S GUIDE

6.2.3 The motor spins, but then stops

The BLDC start-up algorithm could be having trouble finding the BEMF zero-crossing signal required to synchronize the motor commutation.

If you have attached the BLDC add-on board and you are using the supplied BLDC motor, then the pot labeled iRef needs to be turned completely counter clockwise to assure that a good BEMF zero-crossing signal is detected by the PIC16LF1937.

If you are using a different motor, you need to adjust the zero-crossing threshold to match the requirements of the motor. For more information, consult the documentation supplied with the BLDC add-on board.

 2010 Microchip Technology Inc. DS41401B-page 29

F1 Evaluation Platform User’s Guide

NOTES:

DS41401B-page 30  2010 Microchip Technology Inc.

7.1 INTRODUCTION

To help understand the features of the F1 Evaluation Platform and the BLDC add-on board, the schematics are included here.

F1 EVALUATION PLATFORM

USER’S GUIDE

Chapter 7. Schematics

 2010 Microchip Technology Inc. DS41401B-page 31

F1 Evaluation Platform User’s Guide



7.1.1 F1 Evaluation Platform Schematic (1 of 3)

DS41401B-page 32  2010 Microchip Technology Inc.

7.1.2 F1 Evaluation Platform Schematic (2 of 3)

Schematics

 2010 Microchip Technology Inc. DS41401B-page 33

F1 Evaluation Platform User’s Guide

7.1.3 F1 Evaluation Platform Schematic (3 of 3)

DS41401B-page 34  2010 Microchip Technology Inc.

7.1.4 BLDC Add-On Schematic (1 of 3)

Schematics

 2010 Microchip Technology Inc. DS41401B-page 35

F1 Evaluation Platform User’s Guide

7.1.5 BLDC Add-On Schematic (2 of 3)

DS41401B-page 36  2010 Microchip Technology Inc.

7.1.6 BLDC Add-On Schematic (3 of 3)

Schematics

 2010 Microchip Technology Inc. DS41401B-page 37

F1 Evaluation Platform User’s Guide

NOTES:

DS41401B-page 38  2010 Microchip Technology Inc.

F1 EVALUATION PLATFORM

USER’S GUIDE

Index

Numerics

2C Demo.................................................................. 19

3.5-digit LCD............................................................ 12

AC164110................................................................ 17

Ammeter .................................................................. 14

BEMF Zero crossing signal...................................... 29

BLDC Demo....................................... ..... ...... ..... ......19

BLDC expansion................................................ ......14

BLDC motor............................................................. 15

C12IN3-.................................................................... 18

CCP1 Output A .................................................. ......18

CCP1 Output B .................................................. ......18

CCP1 Output C............................ ...... ..... ...... ..... ......18

Centigrade ............................................................... 15

COM1....................................................................... 18

COM2....................................................................... 18

COM3....................................................................... 18

Combined Demo...................................................... 19

Common Problems................................. ...... ..... ......29

Customer Notification Service....................................8

Customer Support......................................................9

Documentation

Conventions........................................................6

Layout................................................................. 5

Enhanced midrange microcontrollers.......................11

EUSART RX ................................ ...... ..... ................. 18

F1 Evaluation Platform............................................. 11

F1 Evaluation Platform Schematic........................... 32

Hardware Features.................................................. 11

16-bit timers...................................................... 11

32-MHz internal oscillator ................................. 11

CCPs ................................................................11

EEPROM.......................................................... 11

Enhanced USART ............................................11

LCD controller............................. ..... ...... ..... ......11

RAM.................................................................. 11

Hardware Libraries & Drivers................................... 21

ICSP pins..................................... ...... ..... ...... ..... ......17

Internet Address......................................................... 8

LCD Demo .................. ...... .......................................19

LCD Display................................. ...... ..... ................. 16

LCD Function Interface........................... ...... ..... ......25

lcd_display_digits................................... 25

lcd_display_on / lcd_display_off..... 25

lcd_init.........................................................25

Linear regulator........................................................15

MCLR.......................................................................18

MCP9800.................................................................11

Temperature sensor.................... ..... ...... ..... ......11

Microchip Internet Web Site....................................... 8

MSSP SCLK.............................................................18

MSSP SDA...............................................................18

PGC .........................................................................18

PGD .........................................................................18

PIC® microcontrollers............................................... 11

PIC16 series.............................................................11

PIC16F1 Evaluation Kit............................................ 11

PIC16F1 family.........................................................11

PIC16LF1937........................................................... 11

PICkit ICSP™ programming capability interface...... 17

PICkit Serial .............................................................14

PICkit Serial connector............................................. 14

PICkit Serial power output.................................. ......14

PICkit™ 2................................................................. 17

PICkit™ 3................................................................. 17

Platform Contents .................................................... 11

F1 Evaluation Platform Demo Board ................11

Powering with PICkit 3.............................................13

JP1....................................................................13

JP2....................................................................13

PICkit ICSP connector........................... ..... ......14

Voltage..............................................................14

Programming and debugging...................................12

 2010 Microchip Technology Inc. DS41401B-page 39

F1 Evaluation Platform User’s Guide

RD1..........................................................................18

RD2..........................................................................18

RE0 ..........................................................................18

RE1 ..........................................................................18

RE2 ..........................................................................18

Reading, Recommended.... ...... ..................................7

Readme......................................................................7

REAL ICE™ in-circuit emulator................................17

Segment 17..............................................................18

Sensorless BLCD add-on board...............................12

Supply voltage..........................................................13

T1OSCI....................................................................18

T1OSCO ..................................................................18

User Interface...........................................................16

Pot ADC value ..................................................16

RPM..................................................................16

Temperature .....................................................16

Time.................................................................. 16

Warranty Registration......... ........................................7

WWW Address...........................................................8

XLP low power.........................................................11

DS41401B-page 40  2010 Microchip Technology Inc.

NOTES:

F1 Evaluation Platform User’s Guide

 2010 Microchip Technology Inc. DS41401B-page 41

Worldwide Sales and Service

AMERICAS

Corporate Office

2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support:

http://support.microchip.com

Web Address:

www.microchip.com

Atlanta

Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455

Boston

Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088

Chicago

Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075

Cleveland

Independence, OH Tel: 216-447-0464 Fax: 216-447-0643

Dallas

Addison, TX Tel: 972-818-7423 Fax: 972-818-2924

Detroit

Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260

Kokomo

Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles

Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608

Santa Clara

Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445

Toronto

Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509

ASIA/PACIFIC

Asia Pacific Office

Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100 Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511 Fax: 86-28-8665-7889

China - Chongqing

Tel: 86-23-8980-9588 Fax: 86-23-8980-9500

China - Hong Kong SAR

Tel: 852-2401-1200 Fax: 852-2401-3431

China - Nanjing

Tel: 86-25-8473-2460 Fax: 86-25-8473-2470

China - Qingdao

Tel: 86-532-8502-7355 Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533 Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829 Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660 Fax: 86-755-8203-1760

China - Wuhan

Tel: 86-27-5980-5300 Fax: 86-27-5980-5118

China - Xian

Tel: 86-29-8833-7252 Fax: 86-29-8833-7256

China - Xiamen

Tel: 86-592-2388138 Fax: 86-592-2388130

China - Zhuhai

Tel: 86-756-3210040 Fax: 86-756-3210049

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-3090-4444 Fax: 91-80-3090-4123

India - New Delhi

Tel: 91-11-4160-8631 Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512 Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea - Daegu

Tel: 82-53-744-4301 Fax: 82-53-744-4302

Korea - Seoul

Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857 Fax: 60-3-6201-9859

Malaysia - Penang

Tel: 60-4-227-8870 Fax: 60-4-227-4068

Philippines - Manila

Tel: 63-2-634-9065 Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870 Fax: 65-6334-8850

Tai wan - Hsin Chu

Tel: 886-3-6578-300 Fax: 886-3-6578-370

Taiwan - Kaohsiung

Tel: 886-7-213-7830 Fax: 886-7-330-9305

Taiwan - Taipei

Tel: 886-2-2500-6610 Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351 Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39 Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828 Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0 Fax: 49-89-627-144-44

Italy - Milan

Tel: 39-0331-742611 Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399 Fax: 31-416-690340

Spain - Madrid

Tel: 34-91-708-08-90 Fax: 34-91-708-08-91

UK - Wokingham

Tel: 44-118-921-5869 Fax: 44-118-921-5820

08/04/10

DS41401B-page 42  2010 Microchip Technology Inc.

Microchip Technology F1 Evaluation Platform for Enhanced PIC Microcontrollers User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Chapter 1. F1 Evaluation Platform Overview

1.1 INTRODUCTION

1.2 PLATFORM CONTENTS

1.3 HARDWARE FEATURES

1.3.1 PIC16LF1937

1.3.2 MCP9800 I2C Temperature Sensor

1.3.3 PICkit™ 3 Programming/Debug Header

1.3.4 PICkit Serial Communications Header

1.3.5 1 Button, 1 Potentiometer, 4 LEDs

1.3.6 One 3.5 Digit LCD

1.3.7 20-pin Motor Control Expansion Connector

1.3.8 Current Monitoring Connector

1.3.9 Generous Prototyping Area

Chapter 2. Getting Started

2.1 INTRODUCTION

FIGURE 2-1: F1 EVALUATION PLATFORM (DM164130-1)

2.2 POWERING THE F1 EVALUATION PLATFORM

2.3 POWERING WITH PICkit™ 3

2.4 POWERING WITH THE CONNECTOR AT JP3

FIGURE 2-2: POWERING WITH THE CONNECTOR AT JP3

2.5 POWERING WITH PICkit™ SERIAL

2.6 POWERING WITH THE BLDC EXPANSION HEADER J3

2.7 DEFAULT FIRMWARE

2.7.1 Blinking LEDs

2.7.2 Measuring the Ambient Temperature

2.7.3 BLDC Motor

2.7.4 LCD Display

2.7.5 User Interface

Chapter 3. Programming the F1 Evaluation Platform

3.1 INTRODUCTION

3.2 PROGRAMMING/DEVELOPMENT TOOL SUPPORT

3.3 HARDWARE RESOURCES

TABLE 3-1:

4.1 INTRODUCTION

4.2 I2C™ DEMO

Chapter 4. Demo Code

4.3 LCD DEMO

4.4 BLDC DEMO

4.5 COMBINED DEMO

Chapter 5. Hardware Libraries and Drivers

5.1 INTRODUCTION

5.2 I2C™ DRIVER

5.3 MCP9800 DRIVER

5.4 RTCC DRIVER

5.5 LCD DRIVER

5.6 USING THE I2C™ DRIVER

5.6.1 I2C Data Structures

TABLE 5-1: I2C_RESULTS_T

5.6.1.2 I2C_T The I2C_T is a structure representing one transaction on the I

5.6.2 I2C Function Interface

5.6.2.1 i2c_init The function i2c_init configures the I

FIGURE 5-1:

5.6.2.2 i2c_insert The function i2c_insert places one complete set of Transaction Request Block

FIGURE 5-2:

5.6.2.3 i2c_build_write_trb / i2c_build_read_trb The i2c_build_write_trb and i2c_build_read_trb functions are helpers to

FIGURE 5-3:

5.6.2.4 i2c_write_block / i2c_read_block The i2c_write_block and i2c_read_block functions are helpers that assemble

FIGURE 5-4:

5.6.2.5 i2c_handler The i2c_handler function must be called for each I

FIGURE 5-5:

5.7 USING THE LCD DRIVER

5.7.1 LCD Data Structur es

5.7.1.1 BCD_TYPE T o simplify BCD to the 7-segment display ma pping, a BCD segment dat a type has been

FIGURE 5-6:

5.7.2 LCD Function Interface

5.7.2.1 lcd_init This function configures the LCD peripheral for this board and this glass. Type B

FIGURE 5-7:

5.7.2.2 lcd_display_digits This function accepts a BCD_TYPE variable and maps each digit to the correct

FIGURE 5-8:

5.7.2.3 lcd_display_on / lcd_display_off These two functions simply turn the LCD peripheral off. The Timer1 oscillator is left

FIGURE 5-9:

5.7.3 LCD Segment Definitions

FIGURE 5-10: LCD DISPLAY

5.8 USING THE RTCC DRIVER

FIGURE 5-11:

5.8.1 RTCC Function Interface