static bool deassert_cs(void)
{
int ret;
if (reset_cs) {
ret = jaylink_set_reset(jaylink_devh);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_set_reset() failed: %s.\n", jaylink_strerror(ret));
return false;
}
} else {
ret = jaylink_jtag_set_trst(jaylink_devh);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_jtag_set_trst() failed: %s.\n", jaylink_strerror(ret));
return false;
}
}
return true;
}
static int jlink_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr, unsigned char *readarr)
{
uint32_t length;
uint8_t *buffer;
length = writecnt + readcnt;
if (length > JTAG_MAX_TRANSFER_SIZE)
return SPI_INVALID_LENGTH;
buffer = malloc(length);
if (!buffer) {
msg_perr("Memory allocation failed.\n");
return SPI_GENERIC_ERROR;
}
/* Reverse all bytes because the device transfers data LSB first. */
reverse_bytes(buffer, writearr, writecnt);
memset(buffer + writecnt, 0x00, readcnt);
if (!assert_cs()) {
free(buffer);
return SPI_PROGRAMMER_ERROR;
}
int ret;
ret = jaylink_jtag_io(jaylink_devh, buffer, buffer, buffer, length * 8, JAYLINK_JTAG_VERSION_2);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_jag_io() failed: %s.\n", jaylink_strerror(ret));
free(buffer);
return SPI_PROGRAMMER_ERROR;
}
if (!deassert_cs()) {
free(buffer);
return SPI_PROGRAMMER_ERROR;
}
/* Reverse all bytes because the device transfers data LSB first. */
reverse_bytes(readarr, buffer + writecnt, readcnt);
free(buffer);
return 0;
}
int jlink_spi_init(void)
{
char *arg;
unsigned long speed = 0;
register_shutdown(jlink_spi_shutdown, NULL);
arg = extract_programmer_param("spispeed");
if (arg) {
char *endptr;
errno = 0;
speed = strtoul(arg, &endptr, 10);
if (*endptr != '\0' || errno != 0) {
msg_perr("Invalid SPI speed specified: %s.\n", arg);
free(arg);
return 1;
}
if (speed < 1) {
msg_perr("SPI speed must be at least 1 kHz.\n");
free(arg);
return 1;
}
}
free(arg);
int ret;
bool use_serial_number;
uint32_t serial_number;
arg = extract_programmer_param("serial");
if (arg) {
if (!strlen(arg)) {
msg_perr("Emptpy serial number specified.\n");
free(arg);
return 1;
}
ret = jaylink_parse_serial_number(arg, &serial_number);
if (ret == JAYLINK_ERR) {
msg_perr("Invalid serial number specified: %s.\n", arg);
free(arg);
return 1;
} if (ret != JAYLINK_OK) {
msg_perr("jaylink_parse_serial_number() failed: %s.\n", jaylink_strerror(ret));
free(arg);
return 1;
}
use_serial_number = true;
} else {
use_serial_number = false;
}
free(arg);
reset_cs = true;
arg = extract_programmer_param("cs");
if (arg) {
if (!strcasecmp(arg, "reset")) {
reset_cs = true;
} else if (!strcasecmp(arg, "trst")) {
reset_cs = false;
} else {
msg_perr("Invalid chip select pin specified: '%s'.\n", arg);
free(arg);
return 1;
}
}
free(arg);
if (reset_cs)
msg_pdbg("Using RESET as chip select signal.\n");
else
msg_pdbg("Using TRST as chip select signal.\n");
ret = jaylink_init(&jaylink_ctx);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_init() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
ret = jaylink_discovery_scan(jaylink_ctx, 0);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_discover_scan() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
struct jaylink_device **devs;
ret = jaylink_get_devices(jaylink_ctx, &devs, NULL);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_get_devices() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
if (!use_serial_number)
msg_pdbg("No device selected, using first device.\n");
size_t i;
struct jaylink_device *dev;
bool device_found = false;
for (i = 0; devs[i]; i++) {
if (use_serial_number) {
uint32_t tmp;
ret = jaylink_device_get_serial_number(devs[i], &tmp);
if (ret == JAYLINK_ERR_NOT_AVAILABLE) {
continue;
} else if (ret != JAYLINK_OK) {
msg_pwarn("jaylink_device_get_serial_number() failed: %s.\n",
jaylink_strerror(ret));
continue;
}
if (serial_number != tmp)
continue;
}
ret = jaylink_open(devs[i], &jaylink_devh);
if (ret == JAYLINK_OK) {
dev = devs[i];
device_found = true;
break;
}
jaylink_devh = NULL;
}
jaylink_free_devices(devs, true);
if (!device_found) {
msg_perr("No J-Link device found.\n");
return 1;
}
size_t length;
char *firmware_version;
ret = jaylink_get_firmware_version(jaylink_devh, &firmware_version,
&length);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_get_firmware_version() failed: %s.\n", jaylink_strerror(ret));
return 1;
} else if (length > 0) {
msg_pdbg("Firmware: %s\n", firmware_version);
free(firmware_version);
}
ret = jaylink_device_get_serial_number(dev, &serial_number);
if (ret == JAYLINK_OK) {
msg_pdbg("S/N: %" PRIu32 "\n", serial_number);
} else if (ret == JAYLINK_ERR_NOT_AVAILABLE) {
msg_pdbg("S/N: N/A\n");
} else {
msg_perr("jaylink_device_get_serial_number() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
uint8_t caps[JAYLINK_DEV_EXT_CAPS_SIZE];
memset(caps, 0, sizeof(caps));
ret = jaylink_get_caps(jaylink_devh, caps);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_get_caps() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_GET_EXT_CAPS)) {
ret = jaylink_get_extended_caps(jaylink_devh, caps);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_get_available_interfaces() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
}
uint32_t ifaces;
ret = jaylink_get_available_interfaces(jaylink_devh, &ifaces);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_get_available_interfaces() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
if (!(ifaces & (1 << JAYLINK_TIF_JTAG))) {
msg_perr("Device does not support JTAG interface.\n");
return 1;
}
ret = jaylink_select_interface(jaylink_devh, JAYLINK_TIF_JTAG, NULL);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_select_interface() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
struct jaylink_hardware_status hwstat;
ret = jaylink_get_hardware_status(jaylink_devh, &hwstat);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_get_hardware_status() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
msg_pdbg("VTarget: %u.%03u V\n", hwstat.target_voltage / 1000,
hwstat.target_voltage % 1000);
if (hwstat.target_voltage < MIN_TARGET_VOLTAGE) {
msg_perr("Target voltage is below %u.%03u V. You need to attach VTref to the I/O voltage of "
"the chip.\n", MIN_TARGET_VOLTAGE / 1000, MIN_TARGET_VOLTAGE % 1000);
return 1;
}
struct jaylink_speed device_speeds;
device_speeds.freq = DEFAULT_FREQ;
device_speeds.div = DEFAULT_FREQ_DIV;
if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_GET_SPEEDS)) {
ret = jaylink_get_speeds(jaylink_devh, &device_speeds);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_get_speeds() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
}
device_speeds.freq /= 1000;
msg_pdbg("Maximum SPI speed: %" PRIu32 " kHz\n", device_speeds.freq / device_speeds.div);
if (!speed) {
speed = device_speeds.freq / device_speeds.div;
msg_pdbg("SPI speed not specified, using %lu kHz.\n", speed);
}
if (speed > (device_speeds.freq / device_speeds.div)) {
msg_perr("Specified SPI speed of %lu kHz is too high. Maximum is %" PRIu32 " kHz.\n", speed,
device_speeds.freq / device_speeds.div);
return 1;
}
ret = jaylink_set_speed(jaylink_devh, speed);
if (ret != JAYLINK_OK) {
msg_perr("jaylink_set_speed() failed: %s.\n", jaylink_strerror(ret));
return 1;
}
msg_pdbg("SPI speed: %lu kHz\n", speed);
/* Ensure that the CS signal is not active initially. */
if (!deassert_cs())
return 1;
register_spi_master(&spi_master_jlink_spi);
return 0;
}
/**
* Perform a SWD I/O operation.
*
* @note This function must only be used if the #JAYLINK_TIF_SWD interface is
* available and selected.
*
* @param[in,out] devh Device handle.
* @param[in] direction Buffer to read the transfer direction from.
* @param[in] out Buffer to read host-to-target data from.
* @param[out] in Buffer to store target-to-host data on success. Its content
* is undefined on failure. The buffer must be large enough to
* contain at least the specified number of bits to transfer.
* @param[in] length Total number of bits to transfer from host to target and
* vice versa.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
* @retval JAYLINK_ERR_TIMEOUT A timeout occurred.
* @retval JAYLINK_ERR_DEV Unspecified device error.
* @retval JAYLINK_ERR_DEV_NO_MEMORY Not enough memory on the device to perform
* the operation.
* @retval JAYLINK_ERR Other error conditions.
*
* @see jaylink_select_interface()
* @see jaylink_set_speed()
*
* @since 0.1.0
*/
JAYLINK_API int jaylink_swd_io(struct jaylink_device_handle *devh,
const uint8_t *direction, const uint8_t *out, uint8_t *in,
uint16_t length)
{
int ret;
struct jaylink_context *ctx;
uint16_t num_bytes;
uint8_t buf[4];
uint8_t status;
if (!devh || !direction || !out || !in || !length)
return JAYLINK_ERR_ARG;
ctx = devh->dev->ctx;
num_bytes = (length + 7) / 8;
ret = transport_start_write_read(devh, 4 + 2 * num_bytes,
num_bytes + 1, true);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_start_write_read() failed: %s.",
jaylink_strerror(ret));
return ret;
}
buf[0] = CMD_SWD_IO;
buf[1] = 0x00;
buffer_set_u16(buf, length, 2);
ret = transport_write(devh, buf, 4);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s.",
jaylink_strerror(ret));
return ret;
}
ret = transport_write(devh, direction, num_bytes);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s.",
jaylink_strerror(ret));
return ret;
}
ret = transport_write(devh, out, num_bytes);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s.",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, in, num_bytes);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s.",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, &status, 1);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s.",
jaylink_strerror(ret));
return ret;
}
if (status == SWD_IO_ERR_NO_MEMORY) {
return JAYLINK_ERR_DEV_NO_MEMORY;
} else if (status > 0) {
log_err(ctx, "SWD I/O operation failed: %02x.", status);
return JAYLINK_ERR_DEV;
}
return JAYLINK_OK;
}
