mir_sdr_ErrT SDRPlay::setGR(int gainReduction, bool absolute, bool syncUpdate)
{
return mir_sdr_SetGr(gainReduction, absolute?1:0, syncUpdate?1:0);
}
int TSDRPLUGIN_API __stdcall tsdrplugin_readasync(tsdrplugin_readasync_function cb, void *ctx) {
working = 1;
int err, sps, grc, rfc, fsc, i, id;
unsigned int fs;
unsigned int frame = 0;
int inited = 0 ;
double freq = desiredfreq;
double gainred = desiredgainred;
err = mir_sdr_Init(gainred, 8, freq / 1000000.0, mir_sdr_BW_8_000, mir_sdr_IF_Zero, &sps);
if (err != 0) {
mir_sdr_Uninit();
RETURN_EXCEPTION("Can't access the Mirics SDR dongle. Make sure it is properly plugged in, drivers are installed and the mir_sdr_api.dll is in the executable's folder and try again. Please, refer to the TSDRPlugin_Miricis readme file for more information.", TSDR_CANNOT_OPEN_DEVICE);
} else
inited = 1;
short * xi = (short *)malloc(sps * SAMPLES_TO_PROCESS_AT_ONCE * sizeof(short));
short * xq = (short *)malloc(sps * SAMPLES_TO_PROCESS_AT_ONCE * sizeof(short));
int outbufsize = 2 * sps * SAMPLES_TO_PROCESS_AT_ONCE;
float * outbuf = (float *) malloc(sizeof(float) * outbufsize);
while (working) {
unsigned int dropped = 0;
for (id = 0; id < SAMPLES_TO_PROCESS_AT_ONCE; id++) {
err = mir_sdr_ReadPacket(&xi[id*sps], &xq[id*sps], &fs, &grc, &rfc, &fsc);
if (fs > frame)
dropped += fs - frame;
// else if (fs < frame) {
// // wrapped around
// dropped += 2147483647 - frame;
// dropped += fs;
// }
frame = fs + sps;
if (err != 0) break;
}
// if desired frequency is different and valid
if (err == 0 && freq != desiredfreq && !(desiredfreq < 60e6 || (desiredfreq > 245e6 && desiredfreq < 420e6) || desiredfreq > 1000e6)) {
err = mir_sdr_SetRf(desiredfreq, 1, 0);
if (err == 0)
freq = desiredfreq; // if OK, frequency has been changed
else if (err == mir_sdr_RfUpdateError) {
// if an error occurs, try to reset the device
if (mir_sdr_Uninit() == 0) inited = 0;
gainred = desiredgainred;
if ((err = mir_sdr_Init(gainred, 8, desiredfreq / 1000000.0, mir_sdr_BW_8_000, mir_sdr_IF_Zero, &sps))==0) inited = 1;
if (err == mir_sdr_OutOfRange) {
// if the desired frequency is outside operational range, go back to the working frequency
if (mir_sdr_Uninit() == 0) inited = 0;
if (mir_sdr_Init(gainred, 8, freq / 1000000.0, mir_sdr_BW_8_000, mir_sdr_IF_Zero, &sps) == 0) inited = 1;
desiredfreq = freq;
err = 0;
} else if (err == 0)
freq = desiredfreq;
} else if (err == mir_sdr_OutOfRange) {
mir_sdr_SetRf(freq, 1, 0);
desiredfreq = freq;
err = 0;
}
}
if (err == 0 && gainred != desiredgainred) {
gainred = desiredgainred;
mir_sdr_SetGr(gainred, 1, 0);
}
if (err == 0)
for (i = 0; i < outbufsize; i++) {
const short val = (i & 1) ? (xq[i >> 1]) : (xi[i >> 1]);
outbuf[i] = val / 32767.0;
}
if (err != 0)
{
working = 0;
break;
}
else
cb(outbuf, outbufsize, ctx, dropped);
}
free(outbuf);
free(xi);
free(xq);
if (inited && mir_sdr_Uninit() != 0) RETURN_EXCEPTION("Cannot properly close the Mirics USB dongle. If you experience any further issues, please disconnect it and reconnect it again.", TSDR_CANNOT_OPEN_DEVICE);
RETURN_EXCEPTION("The Mirics SDR dongle stopped responding.", (err == 0) ? TSDR_OK : TSDR_ERR_PLUGIN);
}