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 int buspirate_program_enable(struct programmer_t *pgm, AVRPART * p)
{
unsigned char cmd[4];
unsigned char res[4];
if (pgm->flag & BP_FLAG_IN_BINMODE) {
/* Clear configured reset pin(s): CS and/or AUX and/or AUX2 */
PDATA(pgm)->current_peripherals_config &= ~PDATA(pgm)->reset;
buspirate_expect_bin_byte(pgm, PDATA(pgm)->current_peripherals_config, 0x01);
}
else
buspirate_expect(pgm, "{\n", "CS ENABLED", 1);
if (p->op[AVR_OP_PGM_ENABLE] == NULL) {
fprintf(stderr,
"program enable instruction not defined for part \"%s\"\n",
p->desc);
return -1;
}
memset(cmd, 0, sizeof(cmd));
avr_set_bits(p->op[AVR_OP_PGM_ENABLE], cmd);
pgm->cmd(pgm, cmd, res);
if (res[2] != cmd[1])
return -2;
return 0;
}
static void buspirate_powerdown(struct programmer_t *pgm)
{
if (pgm->flag & BP_FLAG_IN_BINMODE) {
/* 0b0100wxyz - Configure peripherals w=power, x=pull-ups, y=AUX, z=CS
* we want everything off -- 0b01000000 = 0x40 */
if (buspirate_expect_bin_byte(pgm, 0x40, 0x01))
return;
} else
if (buspirate_expect(pgm, "w\n", "POWER SUPPLIES OFF", 1))
return;
fprintf(stderr, "%s: warning: did not get a response to PowerDown command.\n", progname);
}
static int buspirate_cmd_bin(struct programmer_t *pgm,
unsigned char cmd[4],
unsigned char res[4])
{
/* 0001xxxx - Bulk SPI transfer, send/read 1-16 bytes (0=1byte!)
* we are sending 4 bytes -> 0x13 */
if (!buspirate_expect_bin_byte(pgm, 0x13, 0x01))
return -1;
buspirate_send_bin(pgm, (char *)cmd, 4);
buspirate_recv_bin(pgm, (char *)res, 4);
return 0;
}
static void buspirate_powerdown(struct programmer_t *pgm)
{
if (pgm->flag & BP_FLAG_IN_BINMODE) {
/* 0b0100wxyz - Configure peripherals w=power, x=pull-ups, y=AUX, z=CS
* we want everything off -- 0b01000000 = 0x40 */
if (buspirate_expect_bin_byte(pgm, 0x40, 0x01))
return;
} else {
if (pgm->flag & BP_FLAG_XPARM_CPUFREQ) {
if (!buspirate_expect(pgm, "g\n", "PWM disabled", 1)) {
fprintf(stderr, "%s: warning: did not get a response to stop PWM command.\n", progname);
}
}
if (buspirate_expect(pgm, "w\n", "Power supplies OFF", 1))
return;
}
fprintf(stderr, "%s: warning: did not get a response to PowerDown command.\n", progname);
}
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;
}