int acq_start(struct acq* acq)
{
if (!acq || !acq->xdf)
return -1;
egd_start(acq->dev);
// Inform the acquisition thread to run
pthread_mutex_lock(&acq->lock);
acq->running = 1;
pthread_cond_signal(&acq->cond);
pthread_mutex_unlock(&acq->lock);
return 0;
}
static
int read_eegsignal(int bsigcheck, int pass)
{
struct eegdev* dev;
int type = grp[0].datatype;
size_t strides[3];
void *eeg_t = NULL, *exg_t = NULL;
int32_t *tri_t = NULL;
int ntri, fs, i, baddata, retcode = 1;
size_t tsize = (type == EGD_FLOAT ? sizeof(float) : sizeof(double));
// Reset global variable used to track the expected signal
checking = 0;
nstot = nsread = 0;
if (!(dev = open_device(grp)))
goto exit;
// Get number of channels and configure structures
grp[0].sensortype = egd_sensor_type("eeg");
grp[1].sensortype = egd_sensor_type("undefined");
grp[2].sensortype = egd_sensor_type("trigger");
strides[0] = grp[0].nch*tsize;
strides[1] = grp[1].nch*tsize;
strides[2] = grp[2].nch*sizeof(int32_t);
ntri = grp[2].nch;
eeg_t = calloc(strides[0], NSAMPLE);
exg_t = calloc(strides[1], NSAMPLE);
tri_t = calloc(strides[2], NSAMPLE);
fs = print_cap(dev);
if (test_chinfo(dev)) {
fprintf(stderr, "\tTest_chinfo failed\n");
goto exit;
}
if (egd_acq_setup(dev, 3, strides, 3, grp))
goto exit;
if (egd_start(dev))
goto exit;
for (i=0; i < fs*DURATION; i += NSAMPLE) {
if (egd_get_data(dev, NSAMPLE, eeg_t, exg_t, tri_t) < 0) {
fprintf(stderr, "\tAcq failed at sample %i\n",i);
goto exit;
}
// No checking
if (!bsigcheck) {
if (simple_trigger_check(i, NSAMPLE, ntri, tri_t))
retcode = 2;
continue;
}
if (type == EGD_FLOAT)
baddata = check_signals_f(NSAMPLE, eeg_t, exg_t, tri_t);
else
baddata = check_signals_d(NSAMPLE, eeg_t, exg_t, tri_t);
if (baddata) {
retcode = 2;
break;
}
}
if (egd_stop(dev))
goto exit;
if (egd_close(dev))
goto exit;
dev = NULL;
if (retcode == 1)
retcode = 0;
exit:
if (retcode == 1)
fprintf(stderr, "\terror caught at pass %i: %s",
pass, strerror(errno));
egd_close(dev);
free(eeg_t);
free(exg_t);
free(tri_t);
return retcode;
}