static int buspirate_start_spi_mode_ascii(struct programmer_t *pgm)
{
int spi_cmd = -1;
int cmd;
char *rcvd, mode[11], buf[5];
buspirate_send(pgm, "m\n");
while(1) {
rcvd = buspirate_readline(pgm, NULL, 0);
if (spi_cmd == -1 && sscanf(rcvd, "%d. %10s", &cmd, mode)) {
if (strcmp(mode, "SPI") == 0)
spi_cmd = cmd;
}
if (buspirate_is_prompt(rcvd))
break;
}
if (spi_cmd == -1) {
fprintf(stderr,
"%s: SPI mode number not found. Does your BusPirate support SPI?\n",
progname);
fprintf(stderr, "%s: Try powercycling your BusPirate and try again.\n",
progname);
return -1;
}
snprintf(buf, sizeof(buf), "%d\n", spi_cmd);
buspirate_send(pgm, buf);
buf[0] = '\0';
while (1) {
rcvd = buspirate_readline(pgm, NULL, 0);
if (strstr(rcvd, "Normal (H=3.3V, L=GND)")) {
/* BP firmware 2.1 defaults to Open-drain output.
* That doesn't work on my board, even with pull-up
* resistors. Select 3.3V output mode instead. */
sscanf(rcvd, " %d.", &cmd);
snprintf(buf, sizeof(buf), "%d\n", cmd);
}
if (buspirate_is_prompt(rcvd)) {
if (strncmp(rcvd, "SPI>", 4) == 0) {
fprintf(stderr, "BusPirate is now configured for SPI\n");
break;
}
/* Not yet 'SPI>' prompt */
if (buf[0]) {
buspirate_send(pgm, buf);
buf[0] = '\0';
} else
buspirate_send(pgm, "\n");
}
}
return 0;
}
static int buspirate_cmd_ascii(struct programmer_t *pgm,
unsigned char cmd[4],
unsigned char res[4])
{
char buf[25];
char *rcvd;
int spi_write, spi_read, i = 0;
snprintf(buf, sizeof(buf), "0x%02x 0x%02x 0x%02x 0x%02x\n",
cmd[0], cmd[1], cmd[2], cmd[3]);
buspirate_send(pgm, buf);
while (i < 4) {
rcvd = buspirate_readline(pgm, NULL, 0);
/* WRITE: 0xAC READ: 0x04 */
if (sscanf(rcvd, "WRITE: 0x%x READ: 0x%x", &spi_write, &spi_read) == 2) {
res[i++] = spi_read;
}
if (buspirate_is_prompt(rcvd))
break;
}
if (i != 4) {
fprintf(stderr, "%s: error: SPI has not read 4 bytes back\n", progname);
return -1;
}
/* wait for prompt */
while (buspirate_getc(pgm) != '>')
/* do nothing */;
return 0;
}
static int buspirate_expect(struct programmer_t *pgm, char *send,
char *expect, int wait_for_prompt)
{
int got_it = 0;
size_t expect_len = strlen(expect);
char *rcvd;
buspirate_send(pgm, send);
while (1) {
rcvd = buspirate_readline(pgm, NULL, 0);
if (strncmp(rcvd, expect, expect_len) == 0) {
if (! wait_for_prompt) {
serial_drain(&pgm->fd, 0);
return 1;
} else {
got_it = 1;
}
}
if (buspirate_is_prompt(rcvd))
break;
}
return got_it;
}
static int buspirate_send(struct programmer_t *pgm, char *str)
{
int rc;
if (verbose)
fprintf(stderr, "%s: buspirate_send(): %s", progname, str);
if (pgm->flag & BP_FLAG_IN_BINMODE) {
fprintf(stderr, "BusPirate: Internal error: buspirate_send() called from binmode");
exit(1);
}
rc = serial_send(&pgm->fd, (unsigned char *)str, strlen(str));
if (rc)
return rc;
while (strcmp(buspirate_readline(pgm, NULL, 0), str) != 0)
/* keep reading until we get what we sent there */
;
/* by now we should be in sync */
return 0;
}