305 lines
7.6 KiB
C++
305 lines
7.6 KiB
C++
/*
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* Copyright 2008, 2009 Free Software Foundation, Inc.
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*
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* This software is distributed under the terms of the GNU Affero Public License.
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* See the COPYING file in the main directory for details.
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*
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* This use of this software may be subject to additional restrictions.
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* See the LEGAL file in the main directory for details.
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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 Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero 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 "radioInterface.h"
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#include <Logger.h>
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GSM::Time VectorQueue::nextTime() const
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{
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GSM::Time retVal;
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mLock.lock();
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while (mQ.size()==0) mWriteSignal.wait(mLock);
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retVal = mQ.top()->time();
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mLock.unlock();
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return retVal;
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}
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radioVector* VectorQueue::getStaleBurst(const GSM::Time& targTime)
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{
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mLock.lock();
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if ((mQ.size()==0)) {
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mLock.unlock();
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return NULL;
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}
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if (mQ.top()->time() < targTime) {
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radioVector* retVal = mQ.top();
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mQ.pop();
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mLock.unlock();
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return retVal;
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}
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mLock.unlock();
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return NULL;
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}
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radioVector* VectorQueue::getCurrentBurst(const GSM::Time& targTime)
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{
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mLock.lock();
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if ((mQ.size()==0)) {
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mLock.unlock();
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return NULL;
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}
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if (mQ.top()->time() == targTime) {
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radioVector* retVal = mQ.top();
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mQ.pop();
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mLock.unlock();
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return retVal;
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}
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mLock.unlock();
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return NULL;
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}
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RadioInterface::RadioInterface(RadioDevice *wRadio,
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int wReceiveOffset,
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int wRadioOversampling,
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int wTransceiverOversampling,
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GSM::Time wStartTime)
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{
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underrun = false;
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sendCursor = 0;
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rcvCursor = 0;
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mOn = false;
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mRadio = wRadio;
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receiveOffset = wReceiveOffset;
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samplesPerSymbol = wRadioOversampling;
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mClock.set(wStartTime);
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powerScaling = 1.0;
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}
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RadioInterface::~RadioInterface(void) {
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if (rcvBuffer!=NULL) delete rcvBuffer;
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//mReceiveFIFO.clear();
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}
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double RadioInterface::fullScaleInputValue(void) {
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return mRadio->fullScaleInputValue();
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}
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double RadioInterface::fullScaleOutputValue(void) {
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return mRadio->fullScaleOutputValue();
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}
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void RadioInterface::setPowerAttenuation(double atten)
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{
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double rfGain, digAtten;
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rfGain = mRadio->setTxGain(mRadio->maxTxGain() - atten);
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digAtten = atten - mRadio->maxTxGain() + rfGain;
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if (digAtten < 1.0)
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powerScaling = 1.0;
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else
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powerScaling = 1.0/sqrt(pow(10, (digAtten/10.0)));
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}
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short *RadioInterface::radioifyVector(signalVector &wVector,
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short *retVector,
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float scale,
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bool zeroOut)
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{
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signalVector::iterator itr = wVector.begin();
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short *shortItr = retVector;
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if (zeroOut) {
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while (itr < wVector.end()) {
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*shortItr++ = 0;
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*shortItr++ = 0;
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itr++;
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}
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} else if (scale != 1.0) {
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while (itr < wVector.end()) {
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*shortItr++ = (short) (itr->real() * scale);
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*shortItr++ = (short) (itr->imag() * scale);
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itr++;
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}
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} else {
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while (itr < wVector.end()) {
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*shortItr++ = (short) (itr->real());
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*shortItr++ = (short) (itr->imag());
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itr++;
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}
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}
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return retVector;
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}
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void RadioInterface::unRadioifyVector(short *shortVector, signalVector& newVector)
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{
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signalVector::iterator itr = newVector.begin();
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short *shortItr = shortVector;
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while (itr < newVector.end()) {
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*itr++ = Complex<float>(*shortItr,*(shortItr+1));
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shortItr += 2;
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}
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}
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bool started = false;
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void RadioInterface::pushBuffer(void) {
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if (sendCursor < 2*INCHUNK) return;
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// send resampleVector
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int samplesWritten = mRadio->writeSamples(sendBuffer,
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INCHUNK,
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&underrun,
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writeTimestamp);
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writeTimestamp += (TIMESTAMP) samplesWritten;
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if (sendCursor > 2*samplesWritten)
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memcpy(sendBuffer,sendBuffer+samplesWritten*2,sizeof(short)*2*(sendCursor-2*samplesWritten));
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sendCursor = sendCursor - 2*samplesWritten;
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}
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void RadioInterface::pullBuffer(void)
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{
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bool localUnderrun;
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// receive receiveVector
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short* shortVector = rcvBuffer+rcvCursor;
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int samplesRead = mRadio->readSamples(shortVector,OUTCHUNK,&overrun,readTimestamp,&localUnderrun);
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underrun |= localUnderrun;
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readTimestamp += (TIMESTAMP) samplesRead;
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while (samplesRead < OUTCHUNK) {
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int oldSamplesRead = samplesRead;
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samplesRead += mRadio->readSamples(shortVector+2*samplesRead,
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OUTCHUNK-samplesRead,
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&overrun,
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readTimestamp,
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&localUnderrun);
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underrun |= localUnderrun;
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readTimestamp += (TIMESTAMP) (samplesRead - oldSamplesRead);
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}
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LOG(DEBUG) << "samplesRead " << samplesRead;
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rcvCursor += samplesRead*2;
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}
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bool RadioInterface::tuneTx(double freq)
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{
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return mRadio->setTxFreq(freq);
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}
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bool RadioInterface::tuneRx(double freq)
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{
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return mRadio->setRxFreq(freq);
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}
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void RadioInterface::start()
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{
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LOG(INFO) << "starting radio interface...";
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mAlignRadioServiceLoopThread.start((void * (*)(void*))AlignRadioServiceLoopAdapter,
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(void*)this);
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mOn = true;
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writeTimestamp = mRadio->initialWriteTimestamp();
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readTimestamp = mRadio->initialReadTimestamp();
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mRadio->start();
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LOG(DEBUG) << "Radio started";
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mRadio->updateAlignment(writeTimestamp-10000);
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mRadio->updateAlignment(writeTimestamp-10000);
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LOG(DEBUG) << "radio interface started!";
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}
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void *AlignRadioServiceLoopAdapter(RadioInterface *radioInterface)
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{
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while (1) {
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radioInterface->alignRadio();
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pthread_testcancel();
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}
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return NULL;
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}
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void RadioInterface::alignRadio() {
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sleep(60);
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mRadio->updateAlignment(writeTimestamp+ (TIMESTAMP) 10000);
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}
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void RadioInterface::driveTransmitRadio(signalVector &radioBurst, bool zeroBurst) {
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if (!mOn) return;
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radioifyVector(radioBurst, sendBuffer+sendCursor, powerScaling, zeroBurst);
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sendCursor += (radioBurst.size()*2);
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pushBuffer();
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}
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void RadioInterface::driveReceiveRadio() {
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if (!mOn) return;
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if (mReceiveFIFO.size() > 8) return;
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pullBuffer();
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GSM::Time rcvClock = mClock.get();
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rcvClock.decTN(receiveOffset);
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unsigned tN = rcvClock.TN();
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int rcvSz = rcvCursor/2;
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int readSz = 0;
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const int symbolsPerSlot = gSlotLen + 8;
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// while there's enough data in receive buffer, form received
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// GSM bursts and pass up to Transceiver
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// Using the 157-156-156-156 symbols per timeslot format.
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while (rcvSz > (symbolsPerSlot + (tN % 4 == 0))*samplesPerSymbol) {
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signalVector rxVector((symbolsPerSlot + (tN % 4 == 0)*samplesPerSymbol));
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unRadioifyVector(rcvBuffer+readSz*2,rxVector);
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GSM::Time tmpTime = rcvClock;
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if (rcvClock.FN() >= 0) {
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LOG(DEEPDEBUG) << "FN: " << rcvClock.FN();
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radioVector* rxBurst = new radioVector(rxVector,tmpTime);
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mReceiveFIFO.put(rxBurst);
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}
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mClock.incTN();
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rcvClock.incTN();
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//if (mReceiveFIFO.size() >= 16) mReceiveFIFO.wait(8);
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LOG(DEBUG) << "receiveFIFO: wrote radio vector at time: " << mClock.get() << ", new size: " << mReceiveFIFO.size() ;
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readSz += (symbolsPerSlot+(tN % 4 == 0))*samplesPerSymbol;
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rcvSz -= (symbolsPerSlot+(tN % 4 == 0))*samplesPerSymbol;
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tN = rcvClock.TN();
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}
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if (readSz > 0) {
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rcvCursor -= 2*readSz;
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memmove(rcvBuffer,rcvBuffer+2*readSz,sizeof(short)*rcvCursor);
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}
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}
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