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twiboot
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flag eeprom support

This commit is contained in:
Olaf Rempel 2010-08-15 17:01:06 +02:00
parent 525c2e3701
commit b2c6dc35ce
1 changed files with 16 additions and 10 deletions
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26
main.c
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@ -26,9 +26,8 @@
/*
* atmega8:
* Fuse E: 0xfa (512 words bootloader)
* Fuse H: 0xdd (2.7V BOD)
* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
* Fuse H: 0xda (512 words bootloader)
* Fuse L: 0x84 (8Mhz internal RC-Osz., 2.7V BOD)
*
* atmega88:
* Fuse E: 0xfa (512 words bootloader)
@ -57,6 +56,8 @@
#error MCU not supported
#endif
#define EEPROM_SUPPORT 1
/* 25ms @8MHz */
#define TIMER_RELOAD (0xFF - 195)
@ -137,9 +138,12 @@ const static uint8_t chipinfo[8] = {
(APP_END >> 8) & 0xFF,
APP_END & 0xFF,
#if (EEPROM_SUPPORT)
(E2END >> 8 & 0xFF),
E2END & 0xFF
#else
0x00, 0x00
#endif
};
/* wait 40 * 25ms = 1s */
@ -176,6 +180,7 @@ static void write_flash_page(void)
boot_rww_enable();
}
#if (EEPROM_SUPPORT)
static uint8_t read_eeprom_byte(void)
{
EEARL = addr;
@ -200,6 +205,7 @@ static void write_eeprom_byte(uint8_t val)
#endif
eeprom_busy_wait();
}
#endif /* EEPROM_SUPPORT */
ISR(TWI_vect)
{
@ -256,10 +262,10 @@ ISR(TWI_vect)
} else if (data == MEMTYPE_FLASH) {
cmd = CMD_WRITE_FLASH;
#if (EEPROM_SUPPORT)
} else if (data == MEMTYPE_EEPROM) {
cmd = CMD_WRITE_EEPROM;
#endif
} else {
ack = (0<<TWEA);
}
@ -289,12 +295,12 @@ ISR(TWI_vect)
ack = (0<<TWEA);
}
break;
#if (EEPROM_SUPPORT)
case CMD_WRITE_EEPROM:
write_eeprom_byte(data);
bcnt++;
break;
#endif
default:
ack = (0<<TWEA);
break;
@ -329,11 +335,11 @@ ISR(TWI_vect)
case CMD_READ_FLASH:
data = pgm_read_byte_near(addr++);
break;
#if (EEPROM_SUPPORT)
case CMD_READ_EEPROM:
data = read_eeprom_byte();
break;
#endif
default:
data = 0xFF;
break;