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102 lines (81 sloc) 2.472 kB
#ifdef COPIER
#include "copier.h"
#include <avr/pgmspace.h>
#include <avr/boot.h>
#include "arduino.h"
#include "delay.h"
uint32_t copier_xchange(uint32_t cmd) {
uint32_t r = 0, c = cmd;
uint8_t i = 0;
for (i = 0; i < 32; i++) {
WRITE(COPIER_MOSI, c & 0x80000000); delay_us(5);
c <<= 1;
WRITE(COPIER_SCK, 1); delay_us(5);
r = (r << 1) | (READ(COPIER_MISO)?1:0);
WRITE(COPIER_SCK, 0);
}
delay_us(5);
return r;
}
void init_chip(void);
void init_chip() {
do {
WRITE(COPIER_SCK, 0);
// power up
WRITE(COPIER_RESET, 1);
delay_ms(10);
WRITE(COPIER_RESET, 0);
delay_ms(10);
// hopefully enter programming mode
} while ((copier_xchange(CMD_PROGRAMMING_ENABLE) & (CMD_PROGRAMMING_ENABLE >> 8)) != (CMD_PROGRAMMING_ENABLE >> 8));
}
void copy() {
// initialise
WRITE(COPIER_RESET, 0); SET_OUTPUT(COPIER_RESET);
WRITE(COPIER_SCK, 0); SET_OUTPUT(COPIER_SCK);
WRITE(COPIER_MOSI, 0); SET_OUTPUT(COPIER_MOSI);
SET_INPUT(COPIER_MISO); WRITE(COPIER_MISO, 1);
delay_ms(50);
init_chip();
// verify device signature- should be same as current chip since we haven't the space for the functionality necessary to program anything else
if ((copier_xchange(CMD_READ_SIGNATURE | 0x00) & 0xFF) != SIGNATURE_0)
return;
if ((copier_xchange(CMD_READ_SIGNATURE | 0x01) & 0xFF) != SIGNATURE_1)
return;
if ((copier_xchange(CMD_READ_SIGNATURE | 0x02) & 0xFF) != SIGNATURE_2)
return;
// erase chip
copier_xchange(CMD_CHIP_ERASE);
delay_ms(15); //minimum is 9.0ms
// re-initialise
init_chip();
uint8_t f;
// copy fuses
// first low byte
f = boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS);
copier_xchange(CMD_WRITE_FUSE_BITS | f);
// high byte
f = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
copier_xchange(CMD_WRITE_FUSE_HIGH_BITS | f);
// extended byte
f = boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS);
copier_xchange(CMD_WRITE_FUSE_EXTENDED_BITS | f);
// start copying flash
uint16_t i;
for (i = 0; i < (FLASHEND / 2); i += (SPM_PAGESIZE / 2)) {
uint8_t j;
for (j = 0; j < (SPM_PAGESIZE / 2); j++) {
uint16_t w = pgm_read_word_near((i | j) << 1);
copier_xchange(CMD_LOAD_PROGMEM_LOW_BYTE | (j << 8) | (w & 0xFF));
copier_xchange(CMD_LOAD_PROGMEM_HIGH_BYTE | (j << 8) | (w >> 8));
}
copier_xchange(CMD_WRITE_PROGMEM_PAGE | ((i / (SPM_PAGESIZE / 2)) << 8));
delay_ms(10); //minimum is 4.5ms
}
// reset
delay_ms(10);
SET_INPUT(MOSI);
SET_INPUT(SCK);
SET_INPUT(COPIER_RESET);
}
#endif /* COPIER */
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