razzor
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twiboot
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multicpu support

pull/1/head
Olaf Rempel 10 years ago
parent
e013aea33c
commit
f73b52bc3c
2 changed files with 97 additions and 30 deletions
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  1. +22
    -4
      Makefile
  2. +75
    -26
      main.c

+ 22
- 4
Makefile View File

@ -3,12 +3,25 @@ OBJ = main.o
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
@ -41,7 +57,9 @@ bin: $(PRG).bin
$(OBJCOPY) -j .text -j .data -O binary $< $@
install: text
avrdude -c dragon_isp -P usb -p m88 -U flash:w:$(PRG).hex
avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U flash:w:$(PRG).hex
fuses:
avrdude -c dragon_isp -P usb -p m88 -U lfuse:w:0xc2:m -U hfuse:w:0xdd:m -U efuse:w:0xfa:m
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

+ 75
- 26
main.c View File

@ -1,5 +1,5 @@
/***************************************************************************
* Copyright (C) 07/2010 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 *
@ -25,12 +25,38 @@
#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)
@ -42,17 +68,12 @@
#define TWI_ADDRESS 0x21
#define APP_END 0x1C00
#define VERSION_STRING "TWIBOOT m88-v20"
#define SIGNATURE_BYTES { 0x1E, 0x93, 0x0A, 0x00 }
/* SLA+R */
#define CMD_WAIT 0x00
#define CMD_READ_VERSION 0x01
#define CMD_READ_MEMORY 0x02
/* internal mappings */
#define CMD_READ_SIGNATURE (0x10 | CMD_READ_MEMORY)
#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 */
@ -63,7 +84,7 @@
/* internal mappings */
#define CMD_BOOT_BOOTLOADER (0x10 | CMD_SWITCH_APPLICATION) /* only in APP */
#define CMD_BOOT_APPLICATION (0x20 | CMD_SWITCH_APPLICATION)
#define CMD_WRITE_SIGNATURE (0x10 | CMD_WRITE_MEMORY)
#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 */
@ -73,7 +94,7 @@
#define BOOTTYPE_APPLICATION 0x80
/* CMD_{READ|WRITE}_* parameter */
#define MEMTYPE_SIGNATURE 0x00
#define MEMTYPE_CHIPINFO 0x00
#define MEMTYPE_FLASH 0x01
#define MEMTYPE_EEPROM 0x02
#define MEMTYPE_PARAMETERS 0x03 /* only in APP */
@ -92,7 +113,7 @@
* - start application
* SLA+W, 0x01, 0x80, STO
*
* - read signature bytes
* - 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
@ -109,7 +130,17 @@
*/
const static uint8_t info[16] = VERSION_STRING;
const static uint8_t signature[4] = SIGNATURE_BYTES;
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 = TIMEOUT;
@ -160,9 +191,13 @@ static void write_eeprom_byte(uint8_t val)
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();
}
@ -216,8 +251,8 @@ ISR(TWI_vect)
case CMD_WRITE_MEMORY:
bcnt++;
if (data == MEMTYPE_SIGNATURE) {
cmd = CMD_WRITE_SIGNATURE;
if (data == MEMTYPE_CHIPINFO) {
cmd = CMD_WRITE_CHIPINFO;
} else if (data == MEMTYPE_FLASH) {
cmd = CMD_WRITE_FLASH;
@ -229,6 +264,10 @@ ISR(TWI_vect)
ack = (0<<TWEA);
}
break;
default:
ack = (0<<TWEA);
break;
}
break;
@ -255,6 +294,10 @@ ISR(TWI_vect)
write_eeprom_byte(data);
bcnt++;
break;
default:
ack = (0<<TWEA);
break;
}
break;
}
@ -278,9 +321,9 @@ ISR(TWI_vect)
bcnt %= sizeof(info);
break;
case CMD_READ_SIGNATURE:
data = signature[bcnt++];
bcnt %= sizeof(signature);
case CMD_READ_CHIPINFO:
data = chipinfo[bcnt++];
bcnt %= sizeof(chipinfo);
break;
case CMD_READ_FLASH:
@ -332,13 +375,14 @@ 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)
{
@ -346,7 +390,9 @@ void disable_wdt_timer(void)
WDTCSR = (1<<WDCE) | (1<<WDE);
WDTCSR = (0<<WDE);
}
#endif
int main(void) __attribute__ ((noreturn));
int main(void)
{
DDRB = LED_GN | LED_RT;
@ -356,11 +402,14 @@ int main(void)
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);
TIMSK = (1<<TOIE0);
#elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
TCCR0B = (1<<CS02) | (1<<CS00);
/* enable timer0 OVF interrupt */
TIMSK0 = (1<<TOIE0);
#endif
/* TWI init: set address, auto ACKs with interrupts */
TWAR = (TWI_ADDRESS<<1);
@ -374,8 +423,13 @@ int main(void)
TWCR = 0x00;
/* disable timer0 */
#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 */
MCUCR = (1<<IVCE);
@ -383,10 +437,5 @@ int main(void)
PORTB = 0x00;
uint8_t i;
for (i = 0; i < 10; i++)
_delay_ms(10);
jump_to_app();
return 0;
}

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