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Adds feature to Swap I/Q

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This commit is contained in:
Charles J. Cliffe
2015-05-31 22:13:14 -04:00
parent 3efb036099
commit 8496287455
6 changed files with 72 additions and 31 deletions
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src/sdr/SDRPostThread.cpp
+24 -8
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@@ -6,19 +6,21 @@
#include <deque>
SDRPostThread::SDRPostThread() :
iqDataOutQueue(NULL), iqDataInQueue(NULL), iqVisualQueue(NULL), terminated(false), dcFilter(NULL), num_vis_samples(16384*2) {
iqDataInQueue(NULL), iqDataOutQueue(NULL), iqVisualQueue(NULL), terminated(false), dcFilter(NULL), num_vis_samples(16384*2), swapIQ(false) {
// create a lookup table
for (unsigned int i = 0; i <= 0xffff; i++) {
liquid_float_complex tmp;
liquid_float_complex tmp,tmp_swap;
# if (__BYTE_ORDER == __LITTLE_ENDIAN)
tmp.real = (float(i & 0xff) - 127.4f) * (1.0f/128.0f);
tmp.imag = (float(i >> 8) - 127.4f) * (1.0f/128.0f);
tmp_swap.imag = tmp.real = (float(i & 0xff) - 127.4f) * (1.0f/128.0f);
tmp_swap.real = tmp.imag = (float(i >> 8) - 127.4f) * (1.0f/128.0f);
_lut.push_back(tmp);
_lut_swap.push_back(tmp_swap);
#else // BIG_ENDIAN
tmp.real = (float(i >> 8) - 127.4f) * (1.0f/128.0f);
tmp.imag = (float(i & 0xff) - 127.4f) * (1.0f/128.0f);
tmp_swap.imag = tmp.real = (float(i >> 8) - 127.4f) * (1.0f/128.0f);
tmp_swap.real = tmp.imag = (float(i & 0xff) - 127.4f) * (1.0f/128.0f);
_lut.push_back(tmp);
_lut_swap.push_back(tmp_swap);
#endif
}
}
@@ -64,6 +66,14 @@ int SDRPostThread::getNumVisSamples() {
return num_vis_samples;
}
void SDRPostThread::setSwapIQ(bool swapIQ) {
this->swapIQ.store(swapIQ);
}
bool SDRPostThread::getSwapIQ() {
return this->swapIQ.load();
}
void SDRPostThread::threadMain() {
int n_read;
double seconds = 0.0;
@@ -103,8 +113,14 @@ void SDRPostThread::threadMain() {
dataOut.resize(dataSize);
}
for (int i = 0, iMax = dataSize; i < iMax; i++) {
fpData[i] = _lut[*((uint16_t*)&data_in->data[2*i])];
if (swapIQ) {
for (int i = 0; i < dataSize; i++) {
fpData[i] = _lut_swap[*((uint16_t*)&data_in->data[2*i])];
}
} else {
for (int i = 0; i < dataSize; i++) {
fpData[i] = _lut[*((uint16_t*)&data_in->data[2*i])];
}
}
iirfilt_crcf_execute_block(dcFilter, &fpData[0], dataSize, &dataOut[0]);