ST AN1601 APPLICATION NOTE

AN1601

APPLICATION NOTE

SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

INTRODUCTION

This application note des cribes a software ex ample for driv ing a DALI slave board using an ST7DALI (ST7LITE2 family) microcontroller. It is supplied with the kit ST7DALI-EVAL and can be ordered with the code ST7DALI-EVAL.

The software is written in C language and is compatible with both Metrowerks and Cosmic compilers.

Lamp-Ballast

DALI sl ave

1-10 V

software

DALI master board

DALI slave board

DALI network

Rev. 1.1

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SOFTWARE IMPLEMENTATION FO R ST7DALI-EVAL

1 PROCESS OV ERVIEW

First of all, the DALI slave software initializes the slave system; afterwards, when the DALI master board sends a forward frame (basically 1 address byte and 1 data byte), and the DALI slave board receives the forward frame, a DALI interrupt (IT) is generated. This interrupt sets a flag, when this flag is set, the program che cks whether the c ommand is addr essed to this ballast or not. If the c ommand is a ddress ed to thi s ballast the comman d hand ling process is started and the DALI slave board reacts to the received command.

New frame arrival

Dali IT

Main.c

Process

command

DALI_CMD

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SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

2 GENERAL STRUCTURE OF THE DALI S LA VE SOFTW ARE

The following diagram shows the different software modules and their relationships.

Figure 1. General Block Diagram

PERIPHERAL

MODULES

DALI_REG

(DALI registers)

Init

main. c

Process

Command

DALI_CMD

(DALI commands)

DALI_PUB

Inits

Dali

clock_reset_

supply

ports

main_clock_

contr

pwm_ar_timer

_12bit

lite_timer_8bit

EEPROM

Note: The names of DALI_CMD module functions are prefixed by DALIC_. DALI_REG module functions are prefixed by DALIR_, and DALI_PUB module functions are prefixed by DALIP_.

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SOFTWARE IMPLEMENTATION FO R ST7DALI-EVAL

3 MODULE DE SCRIPTIONS

3.1 MAIN.C MODUL E

For DALI communication, the microcontroller has to monitor the low voltage state on the DALI bus (it is not allowed to be more than 500ms), and so it needs a process to differentiate a frame reception from a bus down.

This module calls all the ini tiali zation routines in the other modules, then i t calls the r outines to switch on the red and green LEDs on the board, and finally it enters an infinite loop.

This loop could be divided in two par ts, the managem ent of the low vo ltage condition of the DALI BUS and fade rate plus the management of the new D ALI frame reception.

The management of the low voltage condition and fade rate i s obtained using a st ate machine, synchronized with a period of 1 ms, in fact the lite_timer_IT_state variable is set to one every 1 ms.

To better understand how it works, please refer to Figure 12 in appendix A. To manage the DALI frame reception, it checks the "dali_receive_status" flag in order to see

if a new forward frame has been received by the microcontroller (MCU). If so, it calls the "DALIC_isTalkingToMe" function to check whether the comma nd is addressed to this ballast or not. If it is, it switches on the green LED and starts the command handling process; otherwise it switch es on the red LED. Fin ally it rese ts the "dali_ receive _statu s" flag to rest art the cycle.

3.2 DALI_CMD MODULE

The main purpose of this module is to handle the DALI commands. DALI_CMD contains several functions, most of them handle a particular DALI command, but

three of them are called from outside the module (from main.c):

1) The “DALIC_Init”, function initializes the ballast at its “POWER_ON_LEVEL”.

2) The “DALIC_isTalkingToMe” function, checks whether the command is addressed to this ballast or not.

3) The “DALIC_ProcessCommand” function is the first step in the process of executing a command. It checks if a repetition fault has occurred (according to the specification, another command between an expected repetition is ignored and leads to the cancellation of the repetition sequence) and it checks whether the command is a special one or a normal one.

The sequence continues as shown in Figure 2:

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SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

Figure 2. DALI_CMD Module Sequence

Reserved special command

Special command

Other special command

Command

Direct arc power

control command

Normal command

Other normal command

Notes:

a) “DALIP_Reserved_Special_Function” is called. This function is empty, it is reserved for fu-

ture needs. b) The function for handling a special command is called through the “special_jt” table. c) The “DALIC_Direct_Arc” function handles this kind of command. d) The function for handling a normal command, is called through the “normal_jt” table (that

points to the function). Note: In the case of COSMIC compilation, this is divided into thr ee tabl es to avoid “long array”

problems (this COSMIC problem has since been solved).

3.3 DALI_REG MODULE

In accordance with the DALI spec ification, some data variables giving information on the ballast and its status have to be stored in memory; we refer to these variables as DALI registers.

The DALI_REG module handles the reading and writing of the DALI registers. It allows access to any of the DALI reg isters in the s ame wa y, whe rever t hey are physic ally sit uated ( ROM, EEPROM, RAM ).

Normally you don’t need to use the functions of this module directly (you can access most of these registers using the functions defined for this pur pose in the DA LI_PUB module). H owever, in case you need direct access to the registers, you can find the description of these functions and how to use them in Appendix B.

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SOFTWARE IMPLEMENTATION FO R ST7DALI-EVAL

3.4 PERIPHERAL MODULES

The purpose of these modules is to handle the different peri pherals and hardware blocks of the MCU, each one is in charge of a specific block.

All these modules have the same file structure. Each module has three files:

– xxx_hr.h where all or part of the registers and the register bits are defined. – xxx.h that contains the d eclaration of the public functions and constants. – xxx.c that contains the function routines.

(xxx represents the name of the module)

3.4.1 “clock_reset_supply” module

This module handles the “RC Oscillator Control” Register (RCCR) and the “System Integrity Control/Status” Register (SICSR). In the current version, it just configures the RCCR to calibrate the RC oscillator frequency. Two factory calibration values are store d in the first two EEPROM addresses, however you can calibrate the RC with a different value. Please refer to the ST7FDALI datasheet SUPPLY, RESET AND CLOCK MANAGEMENT section for more details.

3.4.2 “dali” module

This module handles the DALI peripheral. It initializes the peripheral (DALI_Init function), and contains the DALI interrupt routine that

handles the arrival of a forward frame. It also contains the (Send_DALI_Frame) function that allows sending backward frames to the master boar d. Please refer to t he ST7FDALI da tasheet, section DALI CO MMUNICATION MODULE for more details.

3.4.3 “eeprom” module

This module handles the EEPROM of the MCU. It initializes the EEPROM, so it saves the DALI regi sters (their reset values) in the EE PR OM

the first time that the program is started. It also contains the functions in charge of the physical reading and writing of the EEPROM. When you use the EEPROM, you don’t need to use these functions directly, since a group of functions for handling the EEPROM is defined in the DALI_PUB module.

3.4.4 “lite_timer_8bit” mod ule

This module handles the Lite Timer peripheral (Two 8-bit upcounters for timing purposes). In the current version, it just uses upcounter 1.

It initializes the Lite Timer so that the interrupt routine is run every 1 ms, this routine carries out the various countdowns required by the program.

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SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

3.4.5 “main_clock_contr” mo dule

This module contains the Main Clock Control initialization routine that handles the Main Clock Control/Status Register (MCCSR). In the current version, it enables the MCO output clock; i.e. the CPU clock signal can be seen on this pin.

3.4.6 “ports” module

This module handles the MCU I/O ports. In the current version of the software, this application just uses the PA1 and PA2 ports; they are used as outputs for switching the LEDs on and off, to indicate whether a forward frame has been addressed to this ballast or not.

3.4.7 “pwm_ar_timer_12bit” module

This module controls the 12-bit autoreload timer. In this application the 12-bit autorel oad timer is used for gene rating a PW M signa l to c ontrol

the power level of the lamp (the PWM duty cycle determines the DC output level of the slave board).

So, the purpose of this module is to initialize the timer and set up the PWM duty cycle according to the command received.

3.5 DALI_PUB MODULE

This module has to be m odified (if n eeded ) by the us er. The fol lowing sections desc ribe the main parts of the module.

3.5.1 ROM registers

According the DALI sp ecification, t he DA LI “ve rsion numbe r” a nd “phy sical min. level” re gis ters have to be stored in ROM, these two values are defined in this module by the “ROMRegs” table as follows: ROMRegs[]={0,25}, where the first value is the “version number” and the second is the “physical min. level”, you can modify thes e values according to the bal last used.

3.5.2 Fading functions

“DALIP_LaunchTimer”: starts a countdown in the Lite Timer interrupt routine (“lite_timer_8bit” module), so that the “DALIP_TimerCallback” function is called every 1ms. The parameter passed represent s the number of times th at the function “DA LIP_T imerCa llback” will be called, but i f you pass 0xF F th e fu nctio n wil l be called eve ry 1ms no n s top un til the functi on

“DALIP_DoneTimer” is c alled. “DALIP_DoneTimer”: is used to stop the tim e r started by “DALIP_LaunchTimer”. It should be

called as soon as the process is finished to let the MCU enter in SLOW-WAIT-MODE (in order to save power) if it has nothing more to do.

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SOFTWARE IMPLEMENTATION FO R ST7DALI-EVAL

“DALIP_Ti m erC al lback”: hand les th e fad ing effe ct; basica lly , it in crea ses or decre ase s (one step) the arc power level every “DALIP_iChangeEvery” ms (according to the DALI command processed and the fade time/rate selected), until the required power level is reached.

3.5.3 Arc power control functions

The following functions are the last step in the process of all “arc power control” comma nds: DALIP_Direct_Arc, DALIP_Off, DALIP_Up, DALIP_Down, DALIP_Step_Up, DALIP_Step_Down, DALIP_Step_Down_And_Off, DALIP_On_And_Step_Up. They set the new power level and update the “actu al dim le vel” register. DALIP_Off, DALIP_Up and DALIP_Direct_Arc (if necessary) calculate the “DALIP_iChangeEvery” value used by the “DALIP_TimerCallback” function, this v alue is calculated according the c u rrent fade time/rate value to carry out the fading process.

Note: All the above functions correspond to DALI commands described in the DALI specification.

3.5.4 DALI register access functions

The following functions al low you to wr ite and read mo st of the spec ific DALI re gisters (see DALI spec.). I f you n eed to acce ss the registers directly, refer to the DALI_R EG modul e de scription.

The Write Functions pass just one parameter to update a particular DALI register and returns nothing:

Table 1. List of DALI Register Write functions

Write-Functions DALI register affected

DALIP_SetArc Actual dim level DALIP_SetBallastStatusFlag Status information (bit 0) DALIP_SetLampFailureFlag Status information (bit 1) DALIP_SetLampPowerOnFl ag Status information (bit 2) DALIP_SetFadeReadyFlag Status information (bit 4) DALIP_SetPowerFailureFlag Status information (bit 7)

Note: For Flag Registers, pass 0 to clear the Bit and !=0 to set it. The Read Functions return the current value of a particular DALI register:

Table 2. List of DALI Register Read functions

Read-Function DALI register affected

DALIP_GetArc Actual dim level DALIP_GetFadeTime Fade time DALIP_GetFadeRate Fade rate DALIP_GetMaxLevel Max level DALIP_GetMinLevel Min level DALIP_GetPowerOnL evel Power on level

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SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

DALIP_ G etSysFailur e Level Syste m failure level DALIP_GetSta tu s Status informati o n DALIP_GetVersion Version number DALIP_GetPhysMi n Level Physical min. level

3.5.5 EEPROM access functions

Using thes e functi ons, y ou can re ad and wri te to the c onnec ted EEP ROM . The ad dressi ng range is from 0 to the return-value of DALIP_EEPROM_Size. Accesses outside that range will be ignored.

Note: The returned EEPROM-Size i s the actual size minus a few by tes that are used for saving the DALI-Registers. There is maximum size of 256 bytes for the connected EEPROM. (Bigger ones work too, but only the lower 256 bytes can be accessed).

Caution: If a Page- Write ex ceeds the addressing range, the WHO LE Write Operation will be ignored!

DALIP_EEPROM_Siz e

Return: Highest address that can be passed to an EEPROM -Access-Command

DALIP_Read_E2

Reads one byte from the passed address Param1: Address to be read Return: Data byte read from the EEPROM

DALIP_Write_E2

Writes one byte to the passed address Param1: Address to write to Param2: Data byte to be written

DALIP_Write_E2_Buffer

Writes a sequence of Bytes (uses the page-write-operation of the EEPROM to be faster) Param1: First Address to write to Param2: Number of Bytes to be w r itten Param3: Pointer to the first byte of the array that contains the data

3.5.6 Reserved functions

Many commands in the DALI specification are reserved for future needs. When a forward frame calls for one of these commands, one of the following functions is called. Either “DALIP_Reserved_Function” if the reserved command is not special (commands in the range

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SOFTWARE IMPLEMENTATION FO R ST7DALI-EVAL

0-255) or “DALIP_R eserved_Special_Func ti on” if it’s a s pecial command (commands in the range 256-287).

At present these functions are empty.

3.5.7 Other functions DALIP_Is_Physically_Selected

This function returns 1 if the device is physically selected, otherwise it returns 0. Since the first case it is not yet implemented, at present it alwa ys returns 0.

DALIP_What_Device_Type

This function returns a number that corresponds with the type of the device used. At present it returns 0 that means “device for fluorescent lamps” accor ding to th e D ALI spec ific a tion , so you should specify here the type if it is a different one.

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APPENDI X A. FLOW CHARTS

Figure 3. Main.c Flowchart

POWER_ON_LEVEL va lue

SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

Compiler Init

Peripherals Init

Switch onLEDs

Enable interrupts

Set light le v el @

yes

lite_timer_IT_state=1

State Machine

Switch on red LED

new Frame?

(is dali_receive_status flag set?)

yes

Switch off

Command addressed to this ballast?

(DALIC_isTalkingToMe?)

Restore Status

(reset dali_receive_status flag)

LEDs

yes

Switch on green LED

Process Command

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SOFTWARE IMPLEMENTATION FO R ST7DALI-EVAL

Figure 4. DALIC_is_talking_to_me @ d ali_cmd.c

DALIC_is_talking_to_me

clr b_is_special flag

return 0

special?

broadcast?

group?

direct?

yes

return

yes

return 1

mask group

group 0..7?

group 8..15?

set b_is_special flag

return 1

yes

return 1

yes

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return 0

return 1

SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

Figure 5. DALIC_ProcessCommand @ dali_cmd.c

DALIC_ProcessCommand

yes

DALIC_Is_Repetiton_Fault?

yes

Special Command?

Return

DALIC_ProcessNormalCommand

Return

DALIC_ProcessSpecialCommand

Return

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Figure 6. DALIC_ProcessSpecialC ommand @ dali_cmd.c

DALIC_ProcessSpecialCommand

yes

Reserved Command?

DALIP_Reserved_Special_Function

Return

Execute desired special command routine (function jump table)

Return

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Figure 7. DALIC_ProcessNormalCommand @ dali_cmd.c

DALIC_ProcessNormalCommand

address last bit = 1?

yes

Execute desired command routine (function jump table)

Return

DALIC_Direct_Arc

Return

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Figure 8. DALIC_Is_Repetition_Fault @ dali_cmd.c

DALIC_Is_Repetiton_Fault

IsFlag(b_is_cmd_buffered)? Return 0

yes

No time out & buffer!= Dali

Time out?

No time out & buffer = Dali message?

message?

yes

(b_is_cmd_inbetween)

yes

IsFlag (b_is_cmd_inbetween)?

SetFlag

Return 1

ClrFlag

(b_is_cmd_buffered)

ClrFlag

(b_is_cmd_inbetween)

Return 0

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ClrFlag

(b_is_cmd_buffered)

ClrFlag

(b_is_cmd_inbetween)

Return 0

yes

ClrFlag

(b_is_cmd_buffered)

ClrFlag

(b_is_cmd_inbetween)

Return 1

Return 0

SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

Figure 9. DALIC_Direct_Arc @ da li_cmd.c

DALIC_Direct_Arc

yes

data = 255?

Return

data = 0?

Set LAMP_ARC_POWER_ON

flag

data < MIN_LEVEL

data > MAX_LEVEL

Clear LIMIT_ERROR flag

DALIP_Direct_Arc

at data level

yes

Clear LAMP_ARC_POWER_ON

flag

DALIP_Off

Return

Set LIMIT_ERROR

flag

DALIP_Direct_Arc

at MIN_LEVEL

Return

Set LIMIT_ERROR

flag

DALIP_Direct_Arc

at MAX_LEVEL

Return

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Figure 10. DALIC_Is_Repeated @ dali_cmd.c

DALIC_Is_Repeated

IsFlag(b_is_cmd_buffered)?

yes

ClrFlag(b_is_cmd_buffered)

yes

Time out ?

buffer = Dali message?

Return 0

yes

Return 1

buffer = Dali

SetFlag(b_is_cmd_buffered)

RTC_LaunchTimer(DAL

I_REPETITION_WAIT)

message

Return 0

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SOFTWARE IMPLEMENTATION FOR ST7DALI-EVAL

Figure 11. DALIP_Direct_Arc @ DALI_PU B.C

DALIP_Direct_Arc

Data level = current level?

Turn off timer

(DALIP_DoneTimer)

Fade time = 0?

yes

Presen t po wer level > da t a level?

Set DALIP_bIncrease

flag

Calcul

DALIP_iChangeEvery

yes

DALIP_bIncrease

DALIP_iChangeEvery

Return

clear

flag

Calcul

Update

ACTUAL_DIM_LEVEL

variable (DALIP_SetArc)

Set new PWM duty cycl e

(AR_TIMER_Set_PWM)

Return

Set fad e ready flag (f ade is

running)

DALIP_LaunchTimer(0xFF)

Return

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SOFTWARE IMPLEMENTATION FO R ST7DALI-EVAL

Figure 12. State Machine diagram

Process_Status_0

If DALIBUS == LOW

Process_Status_1

If DALIBUS == HIGH

Initialize Bus Failure Timer Disable Interrupt PB5

If Bus Failure Timer != 0

Process_Status_2

If DALIBUS == LOW Decrease Bus Failure Timer

If Bus Failure Timer == 0

Process_Status_3

Reset Bus Failure Timer Enable Interrupt PB5 Set Bus Failure

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APPENDI X B. DALI_REG MODULE FUNCTIONS

The program makes use of the following functions of the DALI_REG module to read/write the DALI registers easily:

DALIR_ReadReg Purpose: it reads the value of one register. Parameters: name of the register to be read Returns: value of the register

DALIR_WriteReg Purpose: It writes to one of the DALI-Registers Parameters: Name of the register to be write, new value Returns: --

DALIR_WriteStatusBit Purpose: To reset/clear one bit of the DALIREG_STATUS_INFORMATION register. Parameters: name of the bit, 0 to reset the bit and !=0 to set it. Returns: --

DALIR_ReadStatusBit Purpose: It reads the value of one bit of the DALIREG_STATUS_INFORMATION register. Parameters: name of the bit to be read. Returns: bit value (0 or 1).

Other DALI_REG functions:

DALIR_Init Purpose: it initialises the RAM-registers to zero. Parameters: -Returns: --

DALIR_ResetRegs Purpose: It initialises the DALI registers to their “reset value” (the “reset value” for each register is specified the DALI specification) Parameters: -Returns: --

DALIR_LoadRegsFromE2 Purpose: It loads the DALIREG_SHORT_ADDRESS into the “short_addr” variable (function used just in the EEPROM init). Parameters: -Returns: --

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DALIR_DeleteShort Purpose: It writes 0xFF in the DALIREG_SHORT_ADDRESS register, which means that no address is ascribed to this ballast (mask). Parameters: -Returns: --

The names of the registers are defined in dali_regs.h as follows:

RAM-Registers: DALIREG_ACTUAL_DIM_LEVEL (1 byte) DALIREG_SEARCH_ADDRESS (3 bytes) DALIREG_STATUS_INFORMATION (1 byte):

Bit 0: DALIREG_STATUS_BALLAST Bit 1: DALIREG_STATUS_LAMP_FAILURE Bit 2: DALIREG_STATUS_LAMP_ARC_POWER_ON Bit 3: DALIREG_STATUS_LIMIT_ERROR Bit 4: DALIREG_STATUS_FADE_READY Bit 5: DALIREG_STATUS_RESET_STATE Bit 6: DALIREG_STATUS_MISSING_SHORT Bit 7: DALIREG_STATUS_POWER_FAILURE

E²PROM-Registers: DALIREG_POWER_ON_LEVEL (1 byte) DALIREG_SYSTEM_FAILURE_LEVEL (1 byte) DALIREG_MIN_LEVEL (1 byte) DALIREG_MAX_LEVEL (1 byte) DALIREG_FADE_RATE (1 byte) DALIREG_FADE_TIME (1 byte) DALIREG_SHORT_ADDRESS (1 byte) DALIREG_RANDOM_ADDRESS (3 bytes) DALIREG_GROUP_0_7 (1 byte) DALIREG_GROUP_8_15 (1 byte) DALIREG_SCENE (16 bytes)

ROM-Registers: DALIREG_VERSION_NUMBER (1 byte) DALIREG_PHYS_MIN_LEVEL (1 byte)

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ST AN1601 APPLICATION NOTE

Specifications and Main Features

Frequently Asked Questions

User Manual

INTRODUCTION

1 PROCESS OV ERVIEW

2 GENERAL STRUCTURE OF THE DALI S LA VE SOFTW ARE

3 MODULE DE SCRIPTIONS

3.1 MAIN.C MODUL E

3.2 DALI_CMD MODULE

3.3 DALI_REG MODULE

3.4 PERIPHERAL MODULES

3.4.1 “clock_reset_supply” module

3.4.2 “dali” module

3.4.3 “eeprom” module

3.4.4 “lite_timer_8bit” mod ule

3.4.5 “main_clock_contr” mo dule

3.4.6 “ports” module

3.4.7 “pwm_ar_timer_12bit” module

3.5 DALI_PUB MODULE

3.5.1 ROM registers

3.5.2 Fading functions

3.5.3 Arc power control functions

3.5.4 DALI register access functions

3.5.5 EEPROM access functions

3.5.6 Reserved functions

3.5.7 Other functions DALIP_Is_Physically_Selected

APPENDI X A. FLOW CHARTS

APPENDI X B. DALI_REG MODULE FUNCTIONS