Merge branch 'mega88'
This commit is contained in:
commit
525c2e3701
29
Makefile
29
Makefile
|
|
@ -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
|
||||
|
|
|
|||
355
main.c
355
main.c
|
|
@ -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 chip info: 3byte signature, 1byte page size, 2byte flash size, 2byte eeprom size
|
||||
* SLA+W, 0x02, 0x00, SLA+R, {4 bytes}, STO
|
||||
*
|
||||
* - read one (or more) flash bytes
|
||||
* SLA+W, 0x13, addrh, addrl, SLA+R, {* bytes}, STO
|
||||
*
|
||||
* - write one (or more) eeprom bytes
|
||||
* SLA+W, 0x14, addrh, addrl, 0x47, 0x11, {* bytes}, STO
|
||||
* 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
|
||||
*
|
||||
* - boot application
|
||||
* SLA+W, 0x1F, STO
|
||||
* - write one flash page (64bytes on mega8)
|
||||
* SLA+W, 0x02, 0x01, addrh, addrl, {64 bytes}, 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);
|
||||
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;
|
||||
break;
|
||||
|
||||
case CMD_BOOT_APPLICATION:
|
||||
default:
|
||||
/* boot app now */
|
||||
data = CMD_BOOT_APPLICATION;
|
||||
ack = (0<<TWEA);
|
||||
break;
|
||||
}
|
||||
cmd = data;
|
||||
break;
|
||||
|
||||
case 1:
|
||||
switch (cmd) {
|
||||
case CMD_SWITCH_APPLICATION:
|
||||
if (data == BOOTTYPE_APPLICATION) {
|
||||
cmd = CMD_BOOT_APPLICATION;
|
||||
}
|
||||
ack = (0<<TWEA);
|
||||
break;
|
||||
|
||||
case CMD_WRITE_MEMORY:
|
||||
bcnt++;
|
||||
if (data == MEMTYPE_CHIPINFO) {
|
||||
cmd = CMD_WRITE_CHIPINFO;
|
||||
|
||||
} else if (data == MEMTYPE_FLASH) {
|
||||
cmd = CMD_WRITE_FLASH;
|
||||
|
||||
} else if (data == MEMTYPE_EEPROM) {
|
||||
cmd = CMD_WRITE_EEPROM;
|
||||
|
||||
} else {
|
||||
ack = (0<<TWEA);
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
ack = (0<<TWEA);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
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:
|
||||
cmd = CMD_WAIT;
|
||||
bcnt = 0;
|
||||
ack = (0<<TWEA);
|
||||
break;
|
||||
}
|
||||
|
||||
} else if (bcnt == 1) {
|
||||
addr = (TWDR << 8);
|
||||
bcnt++;
|
||||
|
||||
} else if (bcnt == 2) {
|
||||
addr |= TWDR;
|
||||
bcnt++;
|
||||
|
||||
} else if (bcnt == 3) {
|
||||
if (TWDR == (COOKIE >> 8))
|
||||
bcnt++;
|
||||
else
|
||||
bcnt = 0;
|
||||
|
||||
} else if (bcnt == 4) {
|
||||
if (TWDR == (COOKIE & 0xFF))
|
||||
bcnt++;
|
||||
else
|
||||
bcnt = 0;
|
||||
|
||||
} else if (bcnt >= 5 && cmd == CMD_WRITE_FLASH) {
|
||||
buf[bcnt -5] = TWDR;
|
||||
if (bcnt < sizeof(buf) +4) {
|
||||
bcnt++;
|
||||
|
||||
} else {
|
||||
write_flash_page();
|
||||
bcnt = 0;
|
||||
}
|
||||
|
||||
} else if (bcnt >= 5 && cmd == CMD_WRITE_EEPROM) {
|
||||
write_eeprom_byte(TWDR);
|
||||
bcnt++;
|
||||
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;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue