razzor/twiboot
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mega88 version

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This commit is contained in:
Olaf Rempel 2008-06-17 18:02:07 +02:00
parent 96a79d970d
commit dbef89dc6e
2 changed files with 17 additions and 16 deletions
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4
Makefile
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@ -1,6 +1,6 @@
PRG = twiboot
OBJ = main.o
MCU_TARGET = atmega8
MCU_TARGET = atmega88
OPTIMIZE = -Os
DEFS =
@ -41,4 +41,4 @@ 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
uisp -dprog=avr910 -dserial=/dev/ttyS0 -dspeed=115200 -dpart=auto --erase --upload if=$(PRG).hex

29
main.c
View File

@ -45,8 +45,9 @@
* 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)
* Fuse E: 0xfa (512 words bootloader)
* Fuse H: 0xdd (2.7V BOD)
* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
*
* bootloader twi-protocol:
* - get info about bootloader:
@ -71,8 +72,8 @@
* SLA+W, 0x1F, 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] = "TWIBOOT m88-v12";
const static uint8_t signature[4] = { 0x1E, 0x93, 0x0A, 0x00 };
/* wait 40 * 25ms = 1s */
volatile static uint8_t boot_timeout = 40;
@ -115,8 +116,8 @@ void write_eeprom_byte(uint8_t val)
EEDR = val;
addr++;
EECR |= (1<<EEMWE);
EECR |= (1<<EEWE);
EECR |= (1<<EEMPE);
EECR |= (1<<EEPE);
eeprom_busy_wait();
}
@ -272,14 +273,14 @@ int main(void)
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 */
TCCR0 = (1<<CS02) | (1<<CS00);
TCCR0B = (1<<CS02) | (1<<CS00);
/* enable timer0 OVF interrupt */
TIMSK |= (1<<TOIE0);
TIMSK0 |= (1<<TOIE0);
/* TWI init: set address, auto ACKs with interrupts */
TWAR = (TWI_ADDRESS<<1);
@ -293,12 +294,12 @@ int main(void)
TWCR = 0x00;
/* disable timer0 */
TIMSK = 0x00;
TCCR0 = 0x00;
TIMSK0 = 0x00;
TCCR0B = 0x00;
/* move interrupt vectors back to application */
GICR = (1<<IVCE);
GICR = (0<<IVSEL);
MCUCR = (1<<IVCE);
MCUCR = (0<<IVSEL);
PORTB = 0x00;