static int buspirate_start_spi_mode_bin(struct programmer_t *pgm)
{
char buf[20] = { '\0' };
/* == Switch to binmode - send 20x '\0' == */
buspirate_send_bin(pgm, buf, sizeof(buf));
/* Expecting 'BBIOx' reply */
memset(buf, 0, sizeof(buf));
buspirate_recv_bin(pgm, buf, 5);
if (sscanf(buf, "BBIO%d", &PDATA(pgm)->binmode_version) != 1) {
fprintf(stderr, "Binary mode not confirmed: '%s'\n", buf);
buspirate_reset_from_binmode(pgm);
return -1;
}
if (verbose)
fprintf(stderr, "BusPirate binmode version: %d\n",
PDATA(pgm)->binmode_version);
pgm->flag |= BP_FLAG_IN_BINMODE;
/* == Enter SPI mode == */
buf[0] = 0x01; /* Enter raw SPI mode */
buspirate_send_bin(pgm, buf, 1);
memset(buf, 0, sizeof(buf));
buspirate_recv_bin(pgm, buf, 4);
if (sscanf(buf, "SPI%d", &PDATA(pgm)->bin_spi_version) != 1) {
fprintf(stderr, "SPI mode not confirmed: '%s'\n", buf);
buspirate_reset_from_binmode(pgm);
return -1;
}
if (verbose)
fprintf(stderr, "BusPirate SPI version: %d\n",
PDATA(pgm)->bin_spi_version);
/* 0b0100wxyz - Configure peripherals w=power, x=pull-ups/aux2, y=AUX, z=CS
* we want power (0x48) and all reset pins high. */
PDATA(pgm)->current_peripherals_config = 0x48;
PDATA(pgm)->current_peripherals_config |= BP_RESET_CS;
PDATA(pgm)->current_peripherals_config |= BP_RESET_AUX;
if (buspirate_has_aux2(pgm))
PDATA(pgm)->current_peripherals_config |= BP_RESET_AUX2;
buspirate_expect_bin_byte(pgm, PDATA(pgm)->current_peripherals_config, 0x01);
usleep(50000); // sleep for 50ms after power up
/* 01100xxx - SPI speed
* xxx = 000=30kHz, 001=125kHz, 010=250kHz, 011=1MHz,
* 100=2MHz, 101=2.6MHz, 110=4MHz, 111=8MHz
* use 30kHz = 0x60 */
buspirate_expect_bin_byte(pgm, 0x60 | PDATA(pgm)->spifreq, 0x01);
/* 1000wxyz - SPI config, w=HiZ(0)/3.3v(1), x=CLK idle, y=CLK edge, z=SMP sample
* we want: 3.3V(1), idle low(0), data change on trailing edge (1),
* sample in the middle of the pulse (0)
* => 0b10001010 = 0x8a */
buspirate_expect_bin_byte(pgm, 0x8A, 0x01);
return 0;
}
static void buspirate_disable(struct programmer_t *pgm)
{
if (pgm->flag & BP_FLAG_IN_BINMODE) {
serial_recv_timeout = 100;
buspirate_reset_from_binmode(pgm);
} else
buspirate_expect(pgm, "#\n", "RESET", 1);
}
static int buspirate_start_spi_mode_bin(struct programmer_t *pgm)
{
char buf[20] = { '\0' };
/* == Switch to binmode - send 20x '\0' == */
buspirate_send_bin(pgm, buf, sizeof(buf));
/* Expecting 'BBIOx' reply */
memset(buf, 0, sizeof(buf));
buspirate_recv_bin(pgm, buf, 5);
if (sscanf(buf, "BBIO%d", &PDATA(pgm)->binmode_version) != 1) {
fprintf(stderr, "Binary mode not confirmed: '%s'\n", buf);
buspirate_reset_from_binmode(pgm);
return -1;
}
if (verbose)
fprintf(stderr, "BusPirate binmode version: %d\n",
PDATA(pgm)->binmode_version);
pgm->flag |= BP_FLAG_IN_BINMODE;
/* == Enter SPI mode == */
buf[0] = 0x01; /* Enter raw SPI mode */
buspirate_send_bin(pgm, buf, 1);
memset(buf, 0, sizeof(buf));
buspirate_recv_bin(pgm, buf, 4);
if (sscanf(buf, "SPI%d", &PDATA(pgm)->bin_spi_version) != 1) {
fprintf(stderr, "SPI mode not confirmed: '%s'\n", buf);
buspirate_reset_from_binmode(pgm);
return -1;
}
if (verbose)
fprintf(stderr, "BusPirate SPI version: %d\n",
PDATA(pgm)->bin_spi_version);
if (pgm->flag & BP_FLAG_NOPAGEDWRITE) {
if (verbose)
fprintf(stderr, "%s: Paged flash write disabled.\n", progname);
} else {
/* Check for write-then-read without !CS/CS and disable paged_write if absent: */
strncpy(buf, "\x5\x0\x0\x0\x0", 5);
buspirate_send_bin(pgm, buf, 5);
buspirate_recv_bin(pgm, buf, 1);
if (buf[0] != 0x01) {
/* Disable paged write: */
pgm->flag |= BP_FLAG_NOPAGEDWRITE;
/* Return to SPI mode (0x00s have landed us back in binary bitbang mode): */
buf[0] = 0x1;
buspirate_send_bin(pgm, buf, 1);
if (verbose)
fprintf(stderr, "%s: Disabling paged flash write. (Need BusPirate firmware >=v5.10.)\n", progname);
/* Flush serial buffer: */
serial_drain(&pgm->fd, 0);
} else {
if (verbose)
fprintf(stderr, "%s: Paged flash write enabled.\n", progname);
}
}
/* 0b0100wxyz - Configure peripherals w=power, x=pull-ups/aux2, y=AUX, z=CS
* we want power (0x48) and all reset pins high. */
PDATA(pgm)->current_peripherals_config = 0x48 | PDATA(pgm)->reset;
buspirate_expect_bin_byte(pgm, PDATA(pgm)->current_peripherals_config, 0x01);
usleep(50000); // sleep for 50ms after power up
/* 01100xxx - SPI speed
* xxx = 000=30kHz, 001=125kHz, 010=250kHz, 011=1MHz,
* 100=2MHz, 101=2.6MHz, 110=4MHz, 111=8MHz
* use 30kHz = 0x60 */
buspirate_expect_bin_byte(pgm, 0x60 | PDATA(pgm)->spifreq, 0x01);
/* 1000wxyz - SPI config, w=HiZ(0)/3.3v(1), x=CLK idle, y=CLK edge, z=SMP sample
* we want: 3.3V(1), idle low(0), data change on trailing edge (1),
* sample in the middle of the pulse (0)
* => 0b10001010 = 0x8a */
buspirate_expect_bin_byte(pgm, 0x8A, 0x01);
return 0;
}
static void buspirate_enable(struct programmer_t *pgm)
{
unsigned char *reset_str = "#\n";
unsigned char *accept_str = "y\n";
char *rcvd;
int fw_v1 = 0, fw_v2 = 0;
int rc, print_banner = 0;
fprintf(stderr, "Detecting BusPirate...\n");
/* Call buspirate_send_bin() instead of buspirate_send()
* because we don't know if BP is in text or bin mode */
rc = buspirate_send_bin(pgm, reset_str, strlen(reset_str));
if (rc) {
fprintf(stderr, "BusPirate is not responding. Serial port error: %d\n", rc);
exit(1);
}
while(1) {
rcvd = buspirate_readline_noexit(pgm, NULL, 0);
if (! rcvd) {
fprintf(stderr, "BusPirate is not responding. Attempting reset.\n");
buspirate_reset_from_binmode(pgm);
/* re-run buspirate_enable() */
buspirate_enable(pgm);
return;
}
if (strncmp(rcvd, "Are you sure?", 13) == 0) {
buspirate_send_bin(pgm, accept_str, strlen(accept_str));
}
if (strncmp(rcvd, "RESET", 5) == 0) {
print_banner = 1;
continue;
}
if (buspirate_is_prompt(rcvd)) {
puts("**");
break;
}
sscanf(rcvd, "Bus Pirate %9s", PDATA(pgm)->hw_version);
sscanf(rcvd, "Firmware v%d.%d", &fw_v1, &fw_v2);
if (print_banner)
fprintf(stderr, "** %s", rcvd);
}
PDATA(pgm)->fw_version = 100 * fw_v1 + fw_v2;
if (PDATA(pgm)->hw_version[0] == 0 || PDATA(pgm)->fw_version == 0) {
fprintf(stderr, "BusPirate not detected. Aborting.\n");
exit(1);
}
if (buspirate_verifyconfig(pgm) < 0)
exit(1);
if (PDATA(pgm)->fw_version >= FW_BINMODE_VER && !(pgm->flag & BP_FLAG_XPARM_FORCE_ASCII)) {
fprintf(stderr, "BusPirate: using BINARY mode\n");
if (buspirate_start_spi_mode_bin(pgm) < 0)
fprintf(stderr, "%s: Failed to start binary SPI mode\n", progname);
}
if (!pgm->flag & BP_FLAG_IN_BINMODE) {
fprintf(stderr, "BusPirate: using ASCII mode\n");
if (buspirate_start_spi_mode_ascii(pgm) < 0) {
fprintf(stderr, "%s: Failed to start ascii SPI mode\n", progname);
exit(1);
}
}
}
