/*
* issue the 'program enable' command to the AVR device
*/
static int ft245r_program_enable(PROGRAMMER * pgm, AVRPART * p) {
int retry_count = 0;
unsigned char cmd[4];
unsigned char res[4];
int i,reset_ok;
ft245r_set_bitclock(pgm);
retry:
reset_ok = 0;
set_reset(pgm, 0);
usleep(5000); // 5ms
set_reset(pgm, 1);
usleep(5000); // 5ms
set_reset(pgm, 0);
usleep(5000); // 5ms
cmd[0] = 0xAC;
cmd[1] = 0x53;
cmd[2] = 0;
cmd[3] = 0;
ft245r_cmd(pgm, cmd, res);
if (res[2] == 0x53 ) reset_ok = 1;
for (i=0; i<3; i++) {
cmd[0] = 0x30;
cmd[1] = 0;
cmd[2] = i;
cmd[3] = 0;
ft245r_cmd(pgm, cmd, res);
saved_signature[i] = res[3];
}
if (reset_ok && (saved_signature[0] == 0x1e)) // success
return 0;
if (retry_count < 5) {
if (retry_count == 3) {
ft245r_drain (pgm, 0);
tail = head;
}
retry_count++;
goto retry;
}
if ((verbose>=1) || FT245R_DEBUG) {
fprintf(stderr,
"%s: ft245r_program_enable: failed\n", progname);
fflush(stderr);
}
return -1;
}
/*
* issue the 'program enable' command to the AVR device
*/
static int ft245r_program_enable(PROGRAMMER * pgm, AVRPART * p) {
unsigned char cmd[4] = {0,0,0,0};
unsigned char res[4];
int i;
if (p->op[AVR_OP_PGM_ENABLE] == NULL) {
avrdude_message(MSG_INFO, "%s: AVR_OP_PGM_ENABLE command not defined for %s\n",
progname, p->desc);
fflush(stderr);
return -1;
}
avr_set_bits(p->op[AVR_OP_PGM_ENABLE], cmd);
for(i = 0; i < 4; i++) {
ft245r_cmd(pgm, cmd, res);
if (res[p->pollindex-1] == p->pollvalue) return 0;
if (FT245R_DEBUG) {
avrdude_message(MSG_NOTICE, "%s: Program enable command not successful. Retrying.\n",
progname);
fflush(stderr);
}
set_pin(pgm, PIN_AVR_RESET, ON);
usleep(20);
set_pin(pgm, PIN_AVR_RESET, OFF);
if (i == 3) {
ft245r_drain(pgm, 0);
tail = head;
}
}
avrdude_message(MSG_INFO, "%s: Device is not responding to program enable. Check connection.\n",
progname);
fflush(stderr);
return -1;
}