kopia lustrzana https://github.com/f4exb/sdrangel
214 wiersze
5.8 KiB
C++
214 wiersze
5.8 KiB
C++
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <stdio.h>
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#include <errno.h>
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#include "dsp/samplefifo.h"
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#include "bladerfthread.h"
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BladerfThread::BladerfThread(struct bladerf* dev, SampleFifo* sampleFifo, QObject* parent) :
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QThread(parent),
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m_running(false),
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m_dev(dev),
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m_convertBuffer(BLADERF_BLOCKSIZE),
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m_sampleFifo(sampleFifo),
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m_samplerate(2400000),
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m_log2Decim(0)
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{
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}
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BladerfThread::~BladerfThread()
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{
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stopWork();
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}
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void BladerfThread::startWork()
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{
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m_startWaitMutex.lock();
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start();
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while(!m_running)
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m_startWaiter.wait(&m_startWaitMutex, 100);
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m_startWaitMutex.unlock();
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}
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void BladerfThread::stopWork()
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{
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m_running = false;
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wait();
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}
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void BladerfThread::setSamplerate(int samplerate)
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{
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m_samplerate = samplerate;
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}
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void BladerfThread::setLog2Decimation(unsigned int log2_decim)
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{
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m_log2Decim = log2_decim;
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}
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void BladerfThread::run()
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{
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int res;
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m_running = true;
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m_startWaiter.wakeAll();
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while(m_running) {
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if((res = bladerf_sync_rx(m_dev, m_buf, BLADERF_BLOCKSIZE, NULL, 10000)) < 0) {
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qCritical("BladerfThread: sync error: %s", strerror(errno));
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break;
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}
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callback(m_buf, 2 * BLADERF_BLOCKSIZE);
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}
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m_running = false;
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}
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void BladerfThread::decimate1(SampleVector::iterator* it, const qint16* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len; pos += 2) {
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xreal = buf[pos+0];
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yimag = buf[pos+1];
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Sample s( xreal * 16, yimag * 16 ); // shift by 4 bit positions (signed)
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**it = s;
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(*it)++;
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}
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}
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void BladerfThread::decimate2_u(SampleVector::iterator* it, const quint16* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 7; pos += 8) {
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xreal = buf[pos+0] - buf[pos+3];
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yimag = buf[pos+1] + buf[pos+2] - 255;
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Sample s( xreal << 3, yimag << 3 );
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**it = s;
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(*it)++;
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xreal = buf[pos+7] - buf[pos+4];
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yimag = 255 - buf[pos+5] - buf[pos+6];
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Sample t( xreal << 3, yimag << 3 );
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**it = t;
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(*it)++;
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}
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}
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void BladerfThread::decimate2(SampleVector::iterator* it, const qint16* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 7; pos += 8) {
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xreal = buf[pos+0] - buf[pos+3];
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yimag = buf[pos+1] + buf[pos+2];
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Sample s( xreal << 3, yimag << 3 );
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**it = s;
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(*it)++;
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xreal = buf[pos+7] - buf[pos+4];
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yimag = - buf[pos+5] - buf[pos+6];
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Sample t( xreal << 3, yimag << 3 );
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**it = t;
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(*it)++;
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}
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}
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void BladerfThread::decimate4(SampleVector::iterator* it, const qint16* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 7; pos += 8) {
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xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
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yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
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Sample s( xreal << 2, yimag << 2 ); // was shift 3
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**it = s;
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(*it)++;
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}
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}
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void BladerfThread::decimate8(SampleVector::iterator* it, const qint16* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 15; pos += 8) {
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xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
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yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
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Sample s1( xreal << 2, yimag << 2 ); // was shift 3
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pos += 8;
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xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
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yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
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Sample s2( xreal << 2, yimag << 2 ); // was shift 3
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m_decimator2.myDecimate(&s1, &s2);
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**it = s2;
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(*it)++;
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}
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}
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void BladerfThread::decimate16(SampleVector::iterator* it, const qint16* buf, qint32 len)
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{
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// Offset tuning: 4x downsample and rotate, then
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// downsample 4x more. [ rotate: 0, 1, -3, 2, -4, -5, 7, -6]
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qint16 xreal[4], yimag[4];
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for (int pos = 0; pos < len - 31; ) {
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for (int i = 0; i < 4; i++) {
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xreal[i] = (buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4]) << 2; // was shift 4
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yimag[i] = (buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6]) << 2; // was shift 4
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pos += 8;
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}
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Sample s1( xreal[0], yimag[0] );
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Sample s2( xreal[1], yimag[1] );
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Sample s3( xreal[2], yimag[2] );
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Sample s4( xreal[3], yimag[3] );
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m_decimator2.myDecimate(&s1, &s2);
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m_decimator2.myDecimate(&s3, &s4);
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m_decimator4.myDecimate(&s2, &s4);
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**it = s4;
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(*it)++;
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}
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}
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// Decimate according to specified log2 (ex: log2=4 => decim=16)
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void BladerfThread::callback(const qint16* buf, qint32 len)
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{
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SampleVector::iterator it = m_convertBuffer.begin();
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switch (m_log2Decim)
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{
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case 0:
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decimate1(&it, buf, len);
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break;
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case 1:
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decimate2(&it, buf, len);
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break;
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case 2:
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decimate4(&it, buf, len);
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break;
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case 3:
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decimate8(&it, buf, len);
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break;
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case 4:
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decimate16(&it, buf, len);
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break;
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default:
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break;
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}
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m_sampleFifo->write(m_convertBuffer.begin(), it);
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}
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