razzor
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twiboot
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Merge branch 'mega88'

tags/v2.1
Olaf Rempel 10 years ago
parent
a2becf91ad f73b52bc3c
commit
525c2e3701
2 changed files with 260 additions and 110 deletions
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  1. +25
    -4
      Makefile
  2. +235
    -106
      main.c

+ 25
- 4
Makefile View File

@@ -1,14 +1,27 @@
PRG = twiboot
OBJ = main.o
MCU_TARGET = atmega8
MCU_TARGET = atmega88
OPTIMIZE = -Os

DEFS =
ifeq ($(MCU_TARGET), atmega8)
BOOTLOADER_START=0x1C00
AVRDUDE_MCU=m8
endif
ifeq ($(MCU_TARGET), atmega88)
BOOTLOADER_START=0x1C00
AVRDUDE_MCU=m88
endif
ifeq ($(MCU_TARGET), atmega168)
BOOTLOADER_START=0x3C00
AVRDUDE_MCU=m168
endif

DEFS = -DAPP_END=$(BOOTLOADER_START)
LIBS =

# Override is only needed by avr-lib build system.
override CFLAGS = -g -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)
override LDFLAGS = -Wl,-Map,$(PRG).map,--section-start=.text=0x1C00
override LDFLAGS = -Wl,-Map,$(PRG).map,--section-start=.text=$(BOOTLOADER_START)

CC = avr-gcc
OBJCOPY = avr-objcopy
@@ -21,6 +34,9 @@ all: $(PRG).elf lst text
$(PRG).elf: $(OBJ)
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)

%.o: %.c $(MAKEFILE_LIST)
$(CC) $(CFLAGS) -c $< -o $@

clean:
rm -rf *.o *.lst *.map $(PRG).elf *.hex *.bin

@@ -41,4 +57,9 @@ bin: $(PRG).bin
$(OBJCOPY) -j .text -j .data -O binary $< $@

install: text
uisp -dprog=avr910 -dserial=/dev/ttyS0 -dspeed=115200 -dpart=M8 --erase --upload if=$(PRG).hex
avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U flash:w:$(PRG).hex

fuses:
avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U lfuse:w:0xc2:m
avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U hfuse:w:0xdd:m
avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U efuse:w:0xfa:m

+ 235
- 106
main.c View File

@@ -1,5 +1,5 @@
/***************************************************************************
* Copyright (C) 09/2007 by Olaf Rempel *
* Copyright (C) 08/2010 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
@@ -24,65 +24,133 @@
#define F_CPU 8000000
#include <util/delay.h>

/*
* atmega8:
* Fuse E: 0xfa (512 words bootloader)
* Fuse H: 0xdd (2.7V BOD)
* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
*
* atmega88:
* Fuse E: 0xfa (512 words bootloader)
* Fuse H: 0xdd (2.7V BOD)
* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
*
* atmega168:
* Fuse E: 0xfa (512 words bootloader)
* Fuse H: 0xdd (2.7V BOD)
* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
*/

#if defined (__AVR_ATmega8__)
#define VERSION_STRING "TWIBOOT m8v2.0"
#define SIGNATURE_BYTES 0x1E, 0x93, 0x07

#elif defined (__AVR_ATmega88__)
#define VERSION_STRING "TWIBOOT m88v2.0"
#define SIGNATURE_BYTES 0x1E, 0x93, 0x0A

#elif defined (__AVR_ATmega168__)
#define VERSION_STRING "TWIBOOT m168v2.0"
#define SIGNATURE_BYTES 0x1E, 0x94, 0x06

#else
#error MCU not supported
#endif

/* 25ms @8MHz */
#define TIMER_RELOAD (0xFF - 195)

/* 40 * 25ms */
#define TIMEOUT 40

#define LED_RT (1<<PORTB4)
#define LED_GN (1<<PORTB5)

#define TWI_ADDRESS 0x21

#define COOKIE 0x4711
#define APP_END 0x1C00

/* SLA+R */
#define CMD_WAIT 0x00
#define CMD_GET_INFO 0x10
#define CMD_GET_SIGNATURE 0x11
#define CMD_WRITE_FLASH 0x12
#define CMD_READ_FLASH 0x13
#define CMD_WRITE_EEPROM 0x14
#define CMD_READ_EEPROM 0x15
#define CMD_BOOT_APPLICATION 0x1F
#define CMD_READ_VERSION 0x01
#define CMD_READ_MEMORY 0x02
/* internal mappings */
#define CMD_READ_CHIPINFO (0x10 | CMD_READ_MEMORY)
#define CMD_READ_FLASH (0x20 | CMD_READ_MEMORY)
#define CMD_READ_EEPROM (0x30 | CMD_READ_MEMORY)
#define CMD_READ_PARAMETERS (0x40 | CMD_READ_MEMORY) /* only in APP */

/* SLA+W */
#define CMD_SWITCH_APPLICATION CMD_READ_VERSION
#define CMD_WRITE_MEMORY CMD_READ_MEMORY
/* internal mappings */
#define CMD_BOOT_BOOTLOADER (0x10 | CMD_SWITCH_APPLICATION) /* only in APP */
#define CMD_BOOT_APPLICATION (0x20 | CMD_SWITCH_APPLICATION)
#define CMD_WRITE_CHIPINFO (0x10 | CMD_WRITE_MEMORY) /* invalid */
#define CMD_WRITE_FLASH (0x20 | CMD_WRITE_MEMORY)
#define CMD_WRITE_EEPROM (0x30 | CMD_WRITE_MEMORY)
#define CMD_WRITE_PARAMETERS (0x40 | CMD_WRITE_MEMORY) /* only in APP */

/* CMD_SWITCH_APPLICATION parameter */
#define BOOTTYPE_BOOTLOADER 0x00 /* only in APP */
#define BOOTTYPE_APPLICATION 0x80

/* CMD_{READ|WRITE}_* parameter */
#define MEMTYPE_CHIPINFO 0x00
#define MEMTYPE_FLASH 0x01
#define MEMTYPE_EEPROM 0x02
#define MEMTYPE_PARAMETERS 0x03 /* only in APP */

/*
* LED on PORTB4 blinks with 20Hz (while bootloader is running)
* LED on PORTB5 blinks on TWI activity
*
* Fuse H: 0xda (512 words bootloader)
* Fuse L: 0x84 (8Mhz internal RC-Osz., 2.7V BOD)
* LED_GN blinks with 20Hz (while bootloader is running)
* LED_RT blinks on TWI activity
*
* bootloader twi-protocol:
* - get info about bootloader:
* SLA+W, 0x10, SLA+R, {16 bytes}, STO
* - abort boot timeout:
* SLA+W, 0x00, STO
*
* - get signature bytes:
* SLA+W, 0x11, SLA+R, {4 bytes}, STO
* - show bootloader version
* SLA+W, 0x01, SLA+R, {16 bytes}, STO
*
* - write one flash page (64bytes on mega8)
* SLA+W, 0x12, addrh, addrl, 0x47, 0x11, {64 bytes}, STO
* - start application
* SLA+W, 0x01, 0x80, STO
*
* - read one (or more) flash bytes
* SLA+W, 0x13, addrh, addrl, SLA+R, {* bytes}, STO
* - read chip info: 3byte signature, 1byte page size, 2byte flash size, 2byte eeprom size
* SLA+W, 0x02, 0x00, SLA+R, {4 bytes}, STO
*
* - write one (or more) eeprom bytes
* SLA+W, 0x14, addrh, addrl, 0x47, 0x11, {* bytes}, STO
* - read one (or more) flash bytes
* SLA+W, 0x02, 0x01, addrh, addrl, SLA+R, {* bytes}, STO
*
* - read one (or more) eeprom bytes
* SLA+W, 0x15, addrh, addrl, SLA+R, {* bytes}, STO
* SLA+W, 0x02, 0x02, addrh, addrl, SLA+R, {* bytes}, STO
*
* - write one flash page (64bytes on mega8)
* SLA+W, 0x02, 0x01, addrh, addrl, {64 bytes}, STO
*
* - boot application
* SLA+W, 0x1F, STO
* - write one (or more) eeprom bytes
* SLA+W, 0x02, 0x02, addrh, addrl, {* bytes}, STO
*/

const static uint8_t info[16] = "TWIBOOT m8-v1.2";
const static uint8_t signature[4] = { 0x1E, 0x93, 0x07, 0x00 };
const static uint8_t info[16] = VERSION_STRING;
const static uint8_t chipinfo[8] = {
SIGNATURE_BYTES,

SPM_PAGESIZE,

(APP_END >> 8) & 0xFF,
APP_END & 0xFF,

(E2END >> 8 & 0xFF),
E2END & 0xFF
};

/* wait 40 * 25ms = 1s */
static uint8_t boot_timeout = 40;
static uint8_t boot_timeout = TIMEOUT;
volatile static uint8_t cmd = CMD_WAIT;

/* flash buffer */
static uint8_t buf[SPM_PAGESIZE];
static uint16_t addr;

void write_flash_page(void)
static void write_flash_page(void)
{
uint16_t pagestart = addr;
uint8_t size = SPM_PAGESIZE;
@@ -108,21 +176,36 @@ void write_flash_page(void)
boot_rww_enable();
}

void write_eeprom_byte(uint8_t val)
static uint8_t read_eeprom_byte(void)
{
EEARL = addr;
EEARH = (addr >> 8);
EEDR = val;
EECR |= (1<<EERE);
addr++;
return EEDR;
}

static void write_eeprom_byte(uint8_t val)
{
EEARL = addr;
EEARH = (addr >> 8);
EEDR = val;
addr++;
#if defined (__AVR_ATmega8__)
EECR |= (1<<EEMWE);
EECR |= (1<<EEWE);
#elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
EECR |= (1<<EEMPE);
EECR |= (1<<EEPE);
#endif
eeprom_busy_wait();
}

ISR(TWI_vect)
{
static uint8_t bcnt = 0;
static uint8_t bcnt;
uint8_t data;
uint8_t ack = (1<<TWEA);

switch (TWSR & 0xF8) {
/* SLA+W received, ACK returned -> receive data and ACK */
@@ -134,64 +217,95 @@ ISR(TWI_vect)

/* prev. SLA+W, data received, ACK returned -> receive data and ACK */
case 0x80:
if (bcnt == 0) {
cmd = TWDR;
switch (cmd) {
case CMD_GET_INFO:
case CMD_GET_SIGNATURE:
case CMD_WRITE_FLASH:
case CMD_READ_FLASH:
case CMD_WRITE_EEPROM:
case CMD_READ_EEPROM:
data = TWDR;
switch (bcnt) {
case 0:
switch (data) {
case CMD_SWITCH_APPLICATION:
case CMD_WRITE_MEMORY:
bcnt++;
/* no break */

case CMD_WAIT:
/* abort countdown */
boot_timeout = 0;

case CMD_BOOT_APPLICATION:
bcnt++;
break;

default:
cmd = CMD_WAIT;
bcnt = 0;
/* boot app now */
data = CMD_BOOT_APPLICATION;
ack = (0<<TWEA);
break;
}
cmd = data;
break;

} else if (bcnt == 1) {
addr = (TWDR << 8);
bcnt++;

} else if (bcnt == 2) {
addr |= TWDR;
bcnt++;
case 1:
switch (cmd) {
case CMD_SWITCH_APPLICATION:
if (data == BOOTTYPE_APPLICATION) {
cmd = CMD_BOOT_APPLICATION;
}
ack = (0<<TWEA);
break;

} else if (bcnt == 3) {
if (TWDR == (COOKIE >> 8))
case CMD_WRITE_MEMORY:
bcnt++;
else
bcnt = 0;
if (data == MEMTYPE_CHIPINFO) {
cmd = CMD_WRITE_CHIPINFO;

} else if (bcnt == 4) {
if (TWDR == (COOKIE & 0xFF))
bcnt++;
else
bcnt = 0;
} else if (data == MEMTYPE_FLASH) {
cmd = CMD_WRITE_FLASH;

} else if (bcnt >= 5 && cmd == CMD_WRITE_FLASH) {
buf[bcnt -5] = TWDR;
if (bcnt < sizeof(buf) +4) {
bcnt++;
} else if (data == MEMTYPE_EEPROM) {
cmd = CMD_WRITE_EEPROM;

} else {
write_flash_page();
bcnt = 0;
} else {
ack = (0<<TWEA);
}
break;

default:
ack = (0<<TWEA);
break;
}
break;

} else if (bcnt >= 5 && cmd == CMD_WRITE_EEPROM) {
write_eeprom_byte(TWDR);
case 2:
case 3:
addr <<= 8;
addr |= data;
bcnt++;
break;

default:
switch (cmd) {
case CMD_WRITE_FLASH:
buf[bcnt -4] = data;
if (bcnt < sizeof(buf) +3) {
bcnt++;
} else {
write_flash_page();
ack = (0<<TWEA);
}
break;

case CMD_WRITE_EEPROM:
write_eeprom_byte(data);
bcnt++;
break;

default:
ack = (0<<TWEA);
break;
}
break;
}

TWCR |= (1<<TWINT) | (1<<TWEA);
if (ack == 0x00)
bcnt = 0;

TWCR |= (1<<TWINT) | ack;
break;

/* SLA+R received, ACK returned -> send data */
@@ -202,33 +316,30 @@ ISR(TWI_vect)
/* prev. SLA+R, data sent, ACK returned -> send data */
case 0xB8:
switch (cmd) {
case CMD_GET_INFO:
TWDR = info[bcnt++];
case CMD_READ_VERSION:
data = info[bcnt++];
bcnt %= sizeof(info);
break;

case CMD_GET_SIGNATURE:
TWDR = signature[bcnt++];
bcnt %= sizeof(signature);
case CMD_READ_CHIPINFO:
data = chipinfo[bcnt++];
bcnt %= sizeof(chipinfo);
break;

case CMD_READ_FLASH:
TWDR = pgm_read_byte_near(addr++);
data = pgm_read_byte_near(addr++);
break;

case CMD_READ_EEPROM:
EEARL = addr;
EEARH = (addr >> 8);
EECR |= (1<<EERE);
addr++;
TWDR = EEDR;
data = read_eeprom_byte();
break;

default:
TWDR = 0xFF;
data = 0xFF;
break;
}

TWDR = data;
TWCR |= (1<<TWINT) | (1<<TWEA);
break;

@@ -249,8 +360,8 @@ ISR(TWI_vect)

ISR(TIMER0_OVF_vect)
{
/* come back in 25ms (@8MHz) */
TCNT0 = 0xFF - 195;
/* restart timer */
TCNT0 = TIMER_RELOAD;

/* blink LED while running */
PORTB ^= LED_GN;
@@ -264,22 +375,41 @@ ISR(TIMER0_OVF_vect)
cmd = CMD_BOOT_APPLICATION;
}

static void (*jump_to_app)(void) = 0x0000;
static void (*jump_to_app)(void) __attribute__ ((noreturn)) = 0x0000;

/*
* For newer devices (mega88) the watchdog timer remains active even after a
* system reset. So disable it as soon as possible.
* automagically called on startup
*/
#if defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
void disable_wdt_timer(void) __attribute__((naked, section(".init3")));
void disable_wdt_timer(void)
{
MCUSR = 0;
WDTCSR = (1<<WDCE) | (1<<WDE);
WDTCSR = (0<<WDE);
}
#endif

int main(void) __attribute__ ((noreturn));
int main(void)
{
DDRB = LED_GN | LED_RT;
PORTB = LED_GN;

/* move interrupt-vectors to bootloader */
GICR = (1<<IVCE);
GICR = (1<<IVSEL);
MCUCR = (1<<IVCE);
MCUCR = (1<<IVSEL);

/* timer0: running with F_CPU/1024 */
/* timer0: running with F_CPU/1024, OVF interrupt */
#if defined (__AVR_ATmega8__)
TCCR0 = (1<<CS02) | (1<<CS00);

/* enable timer0 OVF interrupt */
TIMSK |= (1<<TOIE0);
TIMSK = (1<<TOIE0);
#elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
TCCR0B = (1<<CS02) | (1<<CS00);
TIMSK0 = (1<<TOIE0);
#endif

/* TWI init: set address, auto ACKs with interrupts */
TWAR = (TWI_ADDRESS<<1);
@@ -293,20 +423,19 @@ int main(void)
TWCR = 0x00;

/* disable timer0 */
TIMSK = 0x00;
#if defined (__AVR_ATmega8__)
TCCR0 = 0x00;
TIMSK = 0x00;
#elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
TIMSK0 = 0x00;
TCCR0B = 0x00;
#endif

/* move interrupt vectors back to application */
GICR = (1<<IVCE);
GICR = (0<<IVSEL);
MCUCR = (1<<IVCE);
MCUCR = (0<<IVSEL);

PORTB = 0x00;

_delay_ms(25);
_delay_ms(25);
_delay_ms(25);
_delay_ms(25);

jump_to_app();
return 0;
}

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