/* Require a 10% margin on the sample rate to ensure we can keep up, and
* warn if this margin is violated
*/
static void check_samplerate(struct cli_state *s, struct rxtx_data *rxtx)
{
int status;
uint64_t samplerate_min; /* Min required sample rate */
unsigned int samplerate_dev; /* Device's current sample rate */
unsigned int n_xfers, samp_per_buf;
pthread_mutex_lock(&rxtx->data_mgmt.lock);
n_xfers = (unsigned int)rxtx->data_mgmt.num_transfers;
samp_per_buf = (unsigned int)rxtx->data_mgmt.samples_per_buffer;
pthread_mutex_unlock(&rxtx->data_mgmt.lock);
samplerate_min = (uint64_t)n_xfers * samp_per_buf;
samplerate_min += (samplerate_min + 9) / 10;
status = bladerf_get_sample_rate(s->dev, rxtx->module, &samplerate_dev);
if (status < 0) {
cli_err(s, "Error", "Failed read device's current sample rate. "
"Unable to perform sanity check.");
} else if (samplerate_dev < samplerate_min) {
if (samplerate_min <= 40000000) {
printf("\n Warning: The current sample rate may be too low. "
"For %u transfers and\n"
" %u samples per buffer, a sample rate >= %"
PRIu64" Hz is\n recommended to avoid timeouts.\n\n",
n_xfers, samp_per_buf, samplerate_min);
} else {
printf("\n Warning: The current configuraion with %u transfers and"
"%u samples per buffer requires a sample rate above 40MHz.\n"
"Timeouts will likely occur with these settings.\n",
n_xfers, samp_per_buf);
}
}
}
static int set_and_check(struct bladerf *dev, bladerf_module m,
unsigned int rate)
{
int status;
unsigned int actual, readback;
status = bladerf_set_sample_rate(dev, m, rate, &actual);
if (status != 0) {
PR_ERROR("Failed to set sample rate: %s\n",
bladerf_strerror(status));
return status;
}
status = bladerf_get_sample_rate(dev, m, &readback);
if (status != 0) {
PR_ERROR("Failed to read back sample rate: %s\n",
bladerf_strerror(status));
return status;
}
return 0;
}
/* Require a 10% margin on the sample rate to ensure we can keep up, and
* warn if this margin is violated.
*
* We effectively ensuring:
*
* Min sample rate > (xfers / timeout period) * samples / buffer
* ^
* 1 xfer = buffer --'
*/
static void check_samplerate(struct cli_state *s, struct rxtx_data *rxtx)
{
int status;
uint64_t samplerate_min; /* Min required sample rate */
unsigned int samplerate_dev; /* Device's current sample rate */
unsigned int n_xfers, samp_per_buf, timeout_ms;
MUTEX_LOCK(&rxtx->data_mgmt.lock);
n_xfers = (unsigned int)rxtx->data_mgmt.num_transfers;
samp_per_buf = (unsigned int)rxtx->data_mgmt.samples_per_buffer;
timeout_ms = rxtx->data_mgmt.timeout_ms;
MUTEX_UNLOCK(&rxtx->data_mgmt.lock);
samplerate_min = (uint64_t)n_xfers * samp_per_buf * 1000 / timeout_ms;
samplerate_min += (samplerate_min + 9) / 10;
status = bladerf_get_sample_rate(s->dev, rxtx->module, &samplerate_dev);
if (status < 0) {
cli_err(s, "Error", "Failed read device's current sample rate. "
"Unable to perform sanity check.\n");
} else if (samplerate_dev < samplerate_min) {
if (samplerate_min <= 40000000) {
printf("\n");
printf(" Warning: The current sample rate may be too low. For %u transfers,\n"
" %u samples per buffer, and a %u ms timeout, a sample rate\n"
" over %"PRIu64" Hz may be required. Alternatively, the 'timeout'\n"
" parameter could be increased, but may yield underruns.\n\n",
n_xfers, samp_per_buf, timeout_ms, samplerate_min);
} else {
printf("\n");
printf(" Warning: The current configuraion with %u transfers,\n"
" %u samples per buffer, and a %u ms timeout requires a\n"
" sample rate above 40MHz. Timeouts may occur with these settings.\n\n",
n_xfers, samp_per_buf, timeout_ms);
}
}
}
static int tx_task_exec_running(struct rxtx_data *tx, struct cli_state *s)
{
int status = 0;
unsigned int samples_per_buffer;
int16_t *tx_buffer;
struct tx_params *tx_params = tx->params;
unsigned int repeats_remaining;
unsigned int delay_us;
unsigned int delay_samples;
unsigned int delay_samples_remaining;
bool repeat_infinite;
unsigned int timeout_ms;
unsigned int sample_rate;
enum state { INIT, READ_FILE, DELAY, PAD_TRAILING, DONE };
enum state state = INIT;
/* Fetch the parameters required for the TX operation */
MUTEX_LOCK(&tx->param_lock);
repeats_remaining = tx_params->repeat;
delay_us = tx_params->repeat_delay;
MUTEX_UNLOCK(&tx->param_lock);
repeat_infinite = (repeats_remaining == 0);
MUTEX_LOCK(&tx->data_mgmt.lock);
samples_per_buffer = (unsigned int)tx->data_mgmt.samples_per_buffer;
timeout_ms = tx->data_mgmt.timeout_ms;
MUTEX_UNLOCK(&tx->data_mgmt.lock);
status = bladerf_get_sample_rate(s->dev, tx->module, &sample_rate);
if (status != 0) {
set_last_error(&tx->last_error, ETYPE_BLADERF, status);
return CLI_RET_LIBBLADERF;
}
/* Compute delay time as a sample count */
delay_samples = (unsigned int)((uint64_t)sample_rate * delay_us / 1000000);
delay_samples_remaining = delay_samples;
/* Allocate a buffer to hold each block of samples to transmit */
tx_buffer = (int16_t*) malloc(samples_per_buffer * 2 * sizeof(int16_t));
if (tx_buffer == NULL) {
status = CLI_RET_MEM;
set_last_error(&tx->last_error, ETYPE_ERRNO,
errno == 0 ? ENOMEM : errno);
}
/* Keep writing samples while there is more data to send and no failures
* have occurred */
while (state != DONE && status == 0) {
unsigned char requests;
unsigned int buffer_samples_remaining = samples_per_buffer;
int16_t *tx_buffer_current = tx_buffer;
/* Stop stream on STOP or SHUTDOWN, but only clear STOP. This will keep
* the SHUTDOWN request around so we can read it when determining
* our state transition */
requests = rxtx_get_requests(tx, RXTX_TASK_REQ_STOP);
if (requests & (RXTX_TASK_REQ_STOP | RXTX_TASK_REQ_SHUTDOWN)) {
break;
}
/* Keep adding to the buffer until it is full or a failure occurs */
while (buffer_samples_remaining > 0 && status == 0 && state != DONE) {
size_t samples_populated = 0;
switch (state) {
case INIT:
case READ_FILE:
MUTEX_LOCK(&tx->file_mgmt.file_lock);
/* Read from the input file */
samples_populated = fread(tx_buffer_current,
2 * sizeof(int16_t),
buffer_samples_remaining,
tx->file_mgmt.file);
assert(samples_populated <= UINT_MAX);
/* If the end of the file was reached, determine whether
* to delay, re-read from the file, or pad the rest of the
* buffer and finish */
if (feof(tx->file_mgmt.file)) {
repeats_remaining--;
if ((repeats_remaining > 0) || repeat_infinite) {
if (delay_samples != 0) {
delay_samples_remaining = delay_samples;
state = DELAY;
}
}
else {
state = PAD_TRAILING;
}
/* Clear the EOF condition and rewind the file */
clearerr(tx->file_mgmt.file);
rewind(tx->file_mgmt.file);
}
/* Check for errors */
else if (ferror(tx->file_mgmt.file)) {
status = errno;
set_last_error(&tx->last_error, ETYPE_ERRNO, status);
}
MUTEX_UNLOCK(&tx->file_mgmt.file_lock);
break;
case DELAY:
/* Insert as many zeros as are necessary to realize the
* specified repeat delay */
samples_populated = uint_min(buffer_samples_remaining,
delay_samples_remaining);
memset(tx_buffer_current, 0,
samples_populated * 2 * sizeof(uint16_t));
delay_samples_remaining -= (unsigned int)samples_populated;
if (delay_samples_remaining == 0) {
state = READ_FILE;
}
break;
case PAD_TRAILING:
/* Populate the remainder of the buffer with zeros */
memset(tx_buffer_current, 0,
buffer_samples_remaining * 2 * sizeof(uint16_t));
state = DONE;
break;
case DONE:
default:
break;
}
/* Advance the buffer pointer.
* Remember, two int16_t's make up 1 sample in the SC16Q11 format */
buffer_samples_remaining -= (unsigned int)samples_populated;
tx_buffer_current += (2 * samples_populated);
}
/* If there were no errors, transmit the data buffer */
if (status == 0) {
bladerf_sync_tx(s->dev, tx_buffer, samples_per_buffer, NULL,
timeout_ms);
}
}
free(tx_buffer);
return status;
}
