Adding in the missing Transceiver52M directory
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2307 19bc5d8c-e614-43d4-8b26-e1612bc8e597
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
new file mode 100644
index 0000000..7cb2128
--- /dev/null
+++ b/Transceiver52M/Transceiver.cpp
@@ -0,0 +1,798 @@
+/*
+* Copyright 2008, 2009, 2010 Free Software Foundation, Inc.
+*
+* This software is distributed under the terms of the GNU Public License.
+* See the COPYING file in the main directory for details.
+*
+* This use of this software may be subject to additional restrictions.
+* See the LEGAL file in the main directory for details.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+/*
+ Compilation switches
+ TRANSMIT_LOGGING write every burst on the given slot to a log
+*/
+
+
+#include <stdio.h>
+#include "Transceiver.h"
+#include <Logger.h>
+
+
+
+Transceiver::Transceiver(int wBasePort,
+ const char *TRXAddress,
+ int wSamplesPerSymbol,
+ GSM::Time wTransmitLatency,
+ RadioInterface *wRadioInterface)
+ :mDataSocket(wBasePort+2,TRXAddress,wBasePort+102),
+ mControlSocket(wBasePort+1,TRXAddress,wBasePort+101),
+ mClockSocket(wBasePort,TRXAddress,wBasePort+100)
+{
+ //GSM::Time startTime(0,0);
+ //GSM::Time startTime(gHyperframe/2 - 4*216*60,0);
+ GSM::Time startTime(random() % gHyperframe,0);
+
+ mFIFOServiceLoopThread = new Thread(32768); ///< thread to push bursts into transmit FIFO
+ mControlServiceLoopThread = new Thread(32768); ///< thread to process control messages from GSM core
+ mTransmitPriorityQueueServiceLoopThread = new Thread(32768);///< thread to process transmit bursts from GSM core
+
+
+ mSamplesPerSymbol = wSamplesPerSymbol;
+ mRadioInterface = wRadioInterface;
+ mTransmitLatency = wTransmitLatency;
+ mTransmitDeadlineClock = startTime;
+ mLastClockUpdateTime = startTime;
+ mLatencyUpdateTime = startTime;
+ mRadioInterface->getClock()->set(startTime);
+ mMaxExpectedDelay = 0;
+
+ // generate pulse and setup up signal processing library
+ gsmPulse = generateGSMPulse(2,mSamplesPerSymbol);
+ LOG(DEBUG) << "gsmPulse: " << *gsmPulse;
+ sigProcLibSetup(mSamplesPerSymbol);
+
+ txFullScale = mRadioInterface->fullScaleInputValue();
+ rxFullScale = mRadioInterface->fullScaleOutputValue();
+
+ // initialize filler tables with dummy bursts, initialize other per-timeslot variables
+ for (int i = 0; i < 8; i++) {
+ signalVector* modBurst = modulateBurst(gDummyBurst,*gsmPulse,
+ 8 + (i % 4 == 0),
+ mSamplesPerSymbol);
+ scaleVector(*modBurst,txFullScale);
+ fillerModulus[i]=26;
+ for (int j = 0; j < 102; j++) {
+ fillerTable[j][i] = new signalVector(*modBurst);
+ }
+ delete modBurst;
+ mChanType[i] = NONE;
+ channelResponse[i] = NULL;
+ DFEForward[i] = NULL;
+ DFEFeedback[i] = NULL;
+ channelEstimateTime[i] = startTime;
+ }
+
+ mOn = false;
+ mTxFreq = 0.0;
+ mRxFreq = 0.0;
+ mPower = -10;
+ mEnergyThreshold = 5.0; // based on empirical data
+ prevFalseDetectionTime = startTime;
+}
+
+Transceiver::~Transceiver()
+{
+ delete gsmPulse;
+ sigProcLibDestroy();
+ mTransmitPriorityQueue.clear();
+}
+
+
+void Transceiver::addRadioVector(BitVector &burst,
+ int RSSI,
+ GSM::Time &wTime)
+{
+ // modulate and stick into queue
+ signalVector* modBurst = modulateBurst(burst,*gsmPulse,
+ 8 + (wTime.TN() % 4 == 0),
+ mSamplesPerSymbol);
+ scaleVector(*modBurst,txFullScale * pow(10,-RSSI/10));
+ radioVector *newVec = new radioVector(*modBurst,wTime);
+ mTransmitPriorityQueue.write(newVec);
+
+ delete modBurst;
+}
+
+#ifdef TRANSMIT_LOGGING
+void Transceiver::unModulateVector(signalVector wVector)
+{
+ SoftVector *burst = demodulateBurst(wVector,
+ *gsmPulse,
+ mSamplesPerSymbol,
+ 1.0,0.0);
+ LOG(DEBUG) << "LOGGED BURST: " << *burst;
+
+/*
+ unsigned char burstStr[gSlotLen+1];
+ SoftVector::iterator burstItr = burst->begin();
+ for (int i = 0; i < gSlotLen; i++) {
+ // FIXME: Demod bits are inverted!
+ burstStr[i] = (unsigned char) ((*burstItr++)*255.0);
+ }
+ burstStr[gSlotLen]='\0';
+ LOG(DEBUG) << "LOGGED BURST: " << burstStr;
+*/
+ delete burst;
+}
+#endif
+
+void Transceiver::pushRadioVector(GSM::Time &nowTime)
+{
+
+ // dump stale bursts, if any
+ while (radioVector* staleBurst = mTransmitPriorityQueue.getStaleBurst(nowTime)) {
+ // Even if the burst is stale, put it in the fillter table.
+ // (It might be an idle pattern.)
+ LOG(NOTICE) << "dumping STALE burst in TRX->USRP interface";
+ const GSM::Time& nextTime = staleBurst->time();
+ int TN = nextTime.TN();
+ int modFN = nextTime.FN() % fillerModulus[TN];
+ delete fillerTable[modFN][TN];
+ fillerTable[modFN][TN] = staleBurst;
+ }
+
+ int TN = nowTime.TN();
+ int modFN = nowTime.FN() % fillerModulus[nowTime.TN()];
+
+ // if queue contains data at the desired timestamp, stick it into FIFO
+ if (radioVector *next = (radioVector*) mTransmitPriorityQueue.getCurrentBurst(nowTime)) {
+ LOG(DEBUG) << "transmitFIFO: wrote burst " << next << " at time: " << nowTime;
+ delete fillerTable[modFN][TN];
+ fillerTable[modFN][TN] = new signalVector(*(next));
+ mRadioInterface->driveTransmitRadio(*(next),(mChanType[TN]==NONE)); //fillerTable[modFN][TN]));
+ delete next;
+#ifdef TRANSMIT_LOGGING
+ if (nowTime.TN()==TRANSMIT_LOGGING) {
+ unModulateVector(*(fillerTable[modFN][TN]));
+ }
+#endif
+ return;
+ }
+
+ // otherwise, pull filler data, and push to radio FIFO
+ mRadioInterface->driveTransmitRadio(*(fillerTable[modFN][TN]),(mChanType[TN]==NONE));
+#ifdef TRANSMIT_LOGGING
+ if (nowTime.TN()==TRANSMIT_LOGGING)
+ unModulateVector(*fillerTable[modFN][TN]);
+#endif
+
+}
+
+void Transceiver::setModulus(int timeslot)
+{
+ switch (mChanType[timeslot]) {
+ case NONE:
+ case I:
+ case II:
+ case III:
+ case FILL:
+ fillerModulus[timeslot] = 26;
+ break;
+ case IV:
+ case VI:
+ case V:
+ fillerModulus[timeslot] = 51;
+ break;
+ //case V:
+ case VII:
+ fillerModulus[timeslot] = 102;
+ break;
+ default:
+ break;
+ }
+}
+
+
+Transceiver::CorrType Transceiver::expectedCorrType(GSM::Time currTime)
+{
+
+ unsigned burstTN = currTime.TN();
+ unsigned burstFN = currTime.FN();
+
+ switch (mChanType[burstTN]) {
+ case NONE:
+ return OFF;
+ break;
+ case FILL:
+ return IDLE;
+ break;
+ case I:
+ return TSC;
+ /*if (burstFN % 26 == 25)
+ return IDLE;
+ else
+ return TSC;*/
+ break;
+ case II:
+ if (burstFN % 2 == 1)
+ return IDLE;
+ else
+ return TSC;
+ break;
+ case III:
+ return TSC;
+ break;
+ case IV:
+ case VI:
+ return RACH;
+ break;
+ case V: {
+ int mod51 = burstFN % 51;
+ if ((mod51 <= 36) && (mod51 >= 14))
+ return RACH;
+ else if ((mod51 == 4) || (mod51 == 5))
+ return RACH;
+ else if ((mod51 == 45) || (mod51 == 46))
+ return RACH;
+ else
+ return TSC;
+ break;
+ }
+ case VII:
+ if ((burstFN % 51 <= 14) && (burstFN % 51 >= 12))
+ return IDLE;
+ else
+ return TSC;
+ break;
+ case LOOPBACK:
+ if ((burstFN % 51 <= 50) && (burstFN % 51 >=48))
+ return IDLE;
+ else
+ return TSC;
+ break;
+ default:
+ return OFF;
+ break;
+ }
+
+}
+
+SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
+ int &RSSI,
+ int &timingOffset)
+{
+ bool needDFE = (mMaxExpectedDelay > 1);
+
+ radioVector *rxBurst = (radioVector *) mReceiveFIFO->get();
+
+ if (!rxBurst) return NULL;
+
+ LOG(DEBUG) << "receiveFIFO: read radio vector at time: " << rxBurst->time() << ", new size: " << mReceiveFIFO->size();
+
+ int timeslot = rxBurst->time().TN();
+
+ CorrType corrType = expectedCorrType(rxBurst->time());
+
+ if ((corrType==OFF) || (corrType==IDLE)) {
+ delete rxBurst;
+ return NULL;
+ }
+
+ // check to see if received burst has sufficient
+ signalVector *vectorBurst = rxBurst;
+ complex amplitude = 0.0;
+ float TOA = 0.0;
+ float avgPwr = 0.0;
+ if (!energyDetect(*vectorBurst,20*mSamplesPerSymbol,mEnergyThreshold,&avgPwr)) {
+ LOG(DEBUG) << "Estimated Energy: " << sqrt(avgPwr) << ", at time " << rxBurst->time();
+ double framesElapsed = rxBurst->time()-prevFalseDetectionTime;
+ if (framesElapsed > 50) { // if we haven't had any false detections for a while, lower threshold
+ mEnergyThreshold -= 10.0/10.0;
+ prevFalseDetectionTime = rxBurst->time();
+ }
+ delete rxBurst;
+ return NULL;
+ }
+ LOG(DEBUG) << "Estimated Energy: " << sqrt(avgPwr) << ", at time " << rxBurst->time();
+
+ // run the proper correlator
+ bool success = false;
+ if (corrType==TSC) {
+ LOG(DEBUG) << "looking for TSC at time: " << rxBurst->time();
+ signalVector *channelResp;
+ double framesElapsed = rxBurst->time()-channelEstimateTime[timeslot];
+ bool estimateChannel = false;
+ if ((framesElapsed > 50) || (channelResponse[timeslot]==NULL)) {
+ if (channelResponse[timeslot]) delete channelResponse[timeslot];
+ if (DFEForward[timeslot]) delete DFEForward[timeslot];
+ if (DFEFeedback[timeslot]) delete DFEFeedback[timeslot];
+ channelResponse[timeslot] = NULL;
+ DFEForward[timeslot] = NULL;
+ DFEFeedback[timeslot] = NULL;
+ estimateChannel = true;
+ }
+ if (!needDFE) estimateChannel = false;
+ float chanOffset;
+ success = analyzeTrafficBurst(*vectorBurst,
+ mTSC,
+ 3.0,
+ mSamplesPerSymbol,
+ &litude,
+ &TOA,
+ mMaxExpectedDelay,
+ estimateChannel,
+ &channelResp,
+ &chanOffset);
+ if (success) {
+ LOG(DEBUG) << "FOUND TSC!!!!!! " << amplitude << " " << TOA;
+ mEnergyThreshold -= 1.0F/10.0F;
+ if (mEnergyThreshold < 0.0) mEnergyThreshold = 0.0;
+ SNRestimate[timeslot] = amplitude.norm2()/(mEnergyThreshold*mEnergyThreshold+1.0); // this is not highly accurate
+ if (estimateChannel) {
+ LOG(DEBUG) << "estimating channel...";
+ channelResponse[timeslot] = channelResp;
+ chanRespOffset[timeslot] = chanOffset;
+ chanRespAmplitude[timeslot] = amplitude;
+ scaleVector(*channelResp, complex(1.0,0.0)/amplitude);
+ designDFE(*channelResp, SNRestimate[timeslot], 7, &DFEForward[timeslot], &DFEFeedback[timeslot]);
+ channelEstimateTime[timeslot] = rxBurst->time();
+ LOG(DEBUG) << "SNR: " << SNRestimate[timeslot] << ", DFE forward: " << *DFEForward[timeslot] << ", DFE backward: " << *DFEFeedback[timeslot];
+ }
+ }
+ else {
+ double framesElapsed = rxBurst->time()-prevFalseDetectionTime;
+ LOG(DEBUG) << "wTime: " << rxBurst->time() << ", pTime: " << prevFalseDetectionTime << ", fElapsed: " << framesElapsed;
+ mEnergyThreshold += 10.0F/10.0F*exp(-framesElapsed);
+ prevFalseDetectionTime = rxBurst->time();
+ channelResponse[timeslot] = NULL;
+ }
+ }
+ else {
+ // RACH burst
+ success = detectRACHBurst(*vectorBurst,
+ 5.0, // detection threshold
+ mSamplesPerSymbol,
+ &litude,
+ &TOA);
+ if (success) {
+ LOG(DEBUG) << "FOUND RACH!!!!!! " << amplitude << " " << TOA;
+ mEnergyThreshold -= (1.0F/10.0F);
+ if (mEnergyThreshold < 0.0) mEnergyThreshold = 0.0;
+ channelResponse[timeslot] = NULL;
+ }
+ else {
+ double framesElapsed = rxBurst->time()-prevFalseDetectionTime;
+ mEnergyThreshold += (1.0F/10.0F)*exp(-framesElapsed);
+ prevFalseDetectionTime = rxBurst->time();
+ }
+ }
+ LOG(DEBUG) << "energy Threshold = " << mEnergyThreshold;
+
+ // demodulate burst
+ SoftVector *burst = NULL;
+ if ((rxBurst) && (success)) {
+ if ((corrType==RACH) || (!needDFE)) {
+ burst = demodulateBurst(*vectorBurst,
+ *gsmPulse,
+ mSamplesPerSymbol,
+ amplitude,TOA);
+ }
+ else { // TSC
+ scaleVector(*vectorBurst,complex(1.0,0.0)/amplitude);
+ burst = equalizeBurst(*vectorBurst,
+ TOA-chanRespOffset[timeslot],
+ mSamplesPerSymbol,
+ *DFEForward[timeslot],
+ *DFEFeedback[timeslot]);
+ }
+ wTime = rxBurst->time();
+ // FIXME: what is full scale for the USRP? we get more that 12 bits of resolution...
+ RSSI = (int) floor(20.0*log10(rxFullScale/amplitude.abs()));
+ LOG(DEBUG) << "RSSI: " << RSSI;
+ timingOffset = (int) round(TOA*256.0/mSamplesPerSymbol);
+ }
+
+ //if (burst) LOG(DEBUG) << "burst: " << *burst << '\n';
+
+ delete rxBurst;
+
+ return burst;
+}
+
+void Transceiver::start()
+{
+ mControlServiceLoopThread->start((void * (*)(void*))ControlServiceLoopAdapter,(void*) this);
+}
+
+void Transceiver::reset()
+{
+ mTransmitPriorityQueue.clear();
+ //mTransmitFIFO->clear();
+ //mReceiveFIFO->clear();
+}
+
+
+void Transceiver::driveControl()
+{
+
+ int MAX_PACKET_LENGTH = 100;
+
+ // check control socket
+ char buffer[MAX_PACKET_LENGTH];
+ int msgLen = -1;
+ buffer[0] = '\0';
+
+ msgLen = mControlSocket.read(buffer);
+
+ if (msgLen < 1) {
+ return;
+ }
+
+ char cmdcheck[4];
+ char command[MAX_PACKET_LENGTH];
+ char response[MAX_PACKET_LENGTH];
+
+ sscanf(buffer,"%3s %s",cmdcheck,command);
+
+ writeClockInterface();
+
+ if (strcmp(cmdcheck,"CMD")!=0) {
+ LOG(WARNING) << "bogus message on control interface";
+ return;
+ }
+ LOG(INFO) << "command is " << buffer;
+
+ if (strcmp(command,"POWEROFF")==0) {
+ // turn off transmitter/demod
+ sprintf(response,"RSP POWEROFF 0");
+ }
+ else if (strcmp(command,"POWERON")==0) {
+ // turn on transmitter/demod
+ if (!mTxFreq || !mRxFreq)
+ sprintf(response,"RSP POWERON 1");
+ else {
+ sprintf(response,"RSP POWERON 0");
+ if (!mOn) {
+ // Prepare for thread start
+ mPower = -20;
+ mRadioInterface->start();
+ generateRACHSequence(*gsmPulse,mSamplesPerSymbol);
+
+ // Start radio interface threads.
+ mFIFOServiceLoopThread->start((void * (*)(void*))FIFOServiceLoopAdapter,(void*) this);
+ mTransmitPriorityQueueServiceLoopThread->start((void * (*)(void*))TransmitPriorityQueueServiceLoopAdapter,(void*) this);
+ writeClockInterface();
+
+ mOn = true;
+ }
+ }
+ }
+ else if (strcmp(command,"SETMAXDLY")==0) {
+ //set expected maximum time-of-arrival
+ int maxDelay;
+ sscanf(buffer,"%3s %s %d",cmdcheck,command,&maxDelay);
+ mMaxExpectedDelay = maxDelay; // 1 GSM symbol is approx. 1 km
+ sprintf(response,"RSP SETMAXDLY 0 %d",maxDelay);
+ }
+ else if (strcmp(command,"SETRXGAIN")==0) {
+ //set expected maximum time-of-arrival
+ int newGain;
+ sscanf(buffer,"%3s %s %d",cmdcheck,command,&newGain);
+ newGain = mRadioInterface->setRxGain(newGain);
+ sprintf(response,"RSP SETRXGAIN 0 %d",newGain);
+ }
+ else if (strcmp(command,"NOISELEV")==0) {
+ if (mOn) {
+ sprintf(response,"RSP NOISELEV 0 %d",
+ (int) round(20.0*log10(rxFullScale/mEnergyThreshold)));
+ }
+ else {
+ sprintf(response,"RSP NOISELEV 1 0");
+ }
+ }
+ else if (strcmp(command,"SETPOWER")==0) {
+ // set output power in dB
+ int dbPwr;
+ sscanf(buffer,"%3s %s %d",cmdcheck,command,&dbPwr);
+ if (!mOn)
+ sprintf(response,"RSP SETPOWER 1 %d",dbPwr);
+ else {
+ mPower = dbPwr;
+ mRadioInterface->setPowerAttenuation(pow(10.0,dbPwr/10.0));
+ sprintf(response,"RSP SETPOWER 0 %d",dbPwr);
+ }
+ }
+ else if (strcmp(command,"ADJPOWER")==0) {
+ // adjust power in dB steps
+ int dbStep;
+ sscanf(buffer,"%3s %s %d",cmdcheck,command,&dbStep);
+ if (!mOn)
+ sprintf(response,"RSP ADJPOWER 1 %d",mPower);
+ else {
+ mPower += dbStep;
+ sprintf(response,"RSP ADJPOWER 0 %d",mPower);
+ }
+ }
+#define FREQOFFSET 0//11.2e3
+ else if (strcmp(command,"RXTUNE")==0) {
+ // tune receiver
+ int freqKhz;
+ sscanf(buffer,"%3s %s %d",cmdcheck,command,&freqKhz);
+ mRxFreq = freqKhz*1.0e3+FREQOFFSET;
+ if (!mRadioInterface->tuneRx(mRxFreq)) {
+ LOG(ALERT) << "RX failed to tune";
+ sprintf(response,"RSP RXTUNE 1 %d",freqKhz);
+ }
+ else
+ sprintf(response,"RSP RXTUNE 0 %d",freqKhz);
+ }
+ else if (strcmp(command,"TXTUNE")==0) {
+ // tune txmtr
+ int freqKhz;
+ sscanf(buffer,"%3s %s %d",cmdcheck,command,&freqKhz);
+ //freqKhz = 890e3;
+ mTxFreq = freqKhz*1.0e3+FREQOFFSET;
+ if (!mRadioInterface->tuneTx(mTxFreq)) {
+ LOG(ALERT) << "TX failed to tune";
+ sprintf(response,"RSP TXTUNE 1 %d",freqKhz);
+ }
+ else
+ sprintf(response,"RSP TXTUNE 0 %d",freqKhz);
+ }
+ else if (strcmp(command,"SETTSC")==0) {
+ // set TSC
+ int TSC;
+ sscanf(buffer,"%3s %s %d",cmdcheck,command,&TSC);
+ if (mOn)
+ sprintf(response,"RSP SETTSC 1 %d",TSC);
+ else {
+ mTSC = TSC;
+ generateMidamble(*gsmPulse,mSamplesPerSymbol,TSC);
+ sprintf(response,"RSP SETTSC 0 %d",TSC);
+ }
+ }
+ else if (strcmp(command,"SETSLOT")==0) {
+ // set TSC
+ int corrCode;
+ int timeslot;
+ sscanf(buffer,"%3s %s %d %d",cmdcheck,command,×lot,&corrCode);
+ if ((timeslot < 0) || (timeslot > 7)) {
+ LOG(WARNING) << "bogus message on control interface";
+ sprintf(response,"RSP SETSLOT 1 %d %d",timeslot,corrCode);
+ return;
+ }
+ mChanType[timeslot] = (ChannelCombination) corrCode;
+ setModulus(timeslot);
+ sprintf(response,"RSP SETSLOT 0 %d %d",timeslot,corrCode);
+
+ }
+ else {
+ LOG(WARNING) << "bogus command " << command << " on control interface.";
+ }
+
+ mControlSocket.write(response,strlen(response)+1);
+
+}
+
+bool Transceiver::driveTransmitPriorityQueue()
+{
+
+ char buffer[gSlotLen+50];
+
+ // check data socket
+ size_t msgLen = mDataSocket.read(buffer);
+
+ if (msgLen!=gSlotLen+1+4+1) {
+ LOG(ERR) << "badly formatted packet on GSM->TRX interface";
+ return false;
+ }
+
+ int timeSlot = (int) buffer[0];
+ uint64_t frameNum = 0;
+ for (int i = 0; i < 4; i++)
+ frameNum = (frameNum << 8) | (0x0ff & buffer[i+1]);
+
+ /*
+ if (GSM::Time(frameNum,timeSlot) > mTransmitDeadlineClock + GSM::Time(51,0)) {
+ // stale burst
+ //LOG(DEBUG) << "FAST! "<< GSM::Time(frameNum,timeSlot);
+ //writeClockInterface();
+ }*/
+
+/*
+ DAB -- Just let these go through the demod.
+ if (GSM::Time(frameNum,timeSlot) < mTransmitDeadlineClock) {
+ // stale burst from GSM core
+ LOG(NOTICE) << "STALE packet on GSM->TRX interface at time "<< GSM::Time(frameNum,timeSlot);
+ return false;
+ }
+*/
+
+ // periodically update GSM core clock
+ LOG(DEBUG) << "mTransmitDeadlineClock " << mTransmitDeadlineClock
+ << " mLastClockUpdateTime " << mLastClockUpdateTime;
+ if (mTransmitDeadlineClock > mLastClockUpdateTime + GSM::Time(216,0))
+ writeClockInterface();
+
+
+ LOG(DEBUG) << "rcvd. burst at: " << GSM::Time(frameNum,timeSlot);
+
+ int RSSI = (int) buffer[5];
+ static BitVector newBurst(gSlotLen);
+ BitVector::iterator itr = newBurst.begin();
+ char *bufferItr = buffer+6;
+ while (itr < newBurst.end())
+ *itr++ = *bufferItr++;
+
+ GSM::Time currTime = GSM::Time(frameNum,timeSlot);
+
+ addRadioVector(newBurst,RSSI,currTime);
+
+ LOG(DEBUG) "added burst - time: " << currTime << ", RSSI: " << RSSI; // << ", data: " << newBurst;
+
+ return true;
+
+
+}
+
+void Transceiver::driveReceiveFIFO()
+{
+
+ SoftVector *rxBurst = NULL;
+ int RSSI;
+ int TOA; // in 1/256 of a symbol
+ GSM::Time burstTime;
+
+ mRadioInterface->driveReceiveRadio();
+
+ rxBurst = pullRadioVector(burstTime,RSSI,TOA);
+
+ if (rxBurst) {
+
+ LOG(DEBUG) << "burst parameters: "
+ << " time: " << burstTime
+ << " RSSI: " << RSSI
+ << " TOA: " << TOA
+ << " bits: " << *rxBurst;
+
+ char burstString[gSlotLen+10];
+ burstString[0] = burstTime.TN();
+ for (int i = 0; i < 4; i++)
+ burstString[1+i] = (burstTime.FN() >> ((3-i)*8)) & 0x0ff;
+ burstString[5] = RSSI;
+ burstString[6] = (TOA >> 8) & 0x0ff;
+ burstString[7] = TOA & 0x0ff;
+ SoftVector::iterator burstItr = rxBurst->begin();
+
+ for (unsigned int i = 0; i < gSlotLen; i++) {
+ burstString[8+i] =(char) round((*burstItr++)*255.0);
+ }
+ burstString[gSlotLen+9] = '\0';
+ delete rxBurst;
+
+ mDataSocket.write(burstString,gSlotLen+10);
+ }
+
+}
+
+void Transceiver::driveTransmitFIFO()
+{
+
+ /**
+ Features a carefully controlled latency mechanism, to
+ assure that transmit packets arrive at the radio/USRP
+ before they need to be transmitted.
+
+ Deadline clock indicates the burst that needs to be
+ pushed into the FIFO right NOW. If transmit queue does
+ not have a burst, stick in filler data.
+ */
+
+
+ RadioClock *radioClock = (mRadioInterface->getClock());
+
+ if (mOn) {
+ //radioClock->wait(); // wait until clock updates
+ LOG(DEBUG) << "radio clock " << radioClock->get();
+ while (radioClock->get() + mTransmitLatency > mTransmitDeadlineClock) {
+ // if underrun, then we're not providing bursts to radio/USRP fast
+ // enough. Need to increase latency by one GSM frame.
+ if (mRadioInterface->isUnderrun()) {
+ // only do latency update every 10 frames, so we don't over update
+ if (radioClock->get() > mLatencyUpdateTime + GSM::Time(10,0)) {
+ mTransmitLatency = mTransmitLatency + GSM::Time(1,0);
+ LOG(INFO) << "new latency: " << mTransmitLatency;
+ mLatencyUpdateTime = radioClock->get();
+ }
+ }
+ else {
+ // if underrun hasn't occurred in the last sec (216 frames) drop
+ // transmit latency by a timeslot
+ if (mTransmitLatency > GSM::Time(1,1)) {
+ if (radioClock->get() > mLatencyUpdateTime + GSM::Time(216,0)) {
+ mTransmitLatency.decTN();
+ LOG(INFO) << "reduced latency: " << mTransmitLatency;
+ mLatencyUpdateTime = radioClock->get();
+ }
+ }
+ }
+ // time to push burst to transmit FIFO
+ pushRadioVector(mTransmitDeadlineClock);
+ mTransmitDeadlineClock.incTN();
+ }
+
+ }
+ // FIXME -- This should not be a hard spin.
+ // But any delay here causes us to throw omni_thread_fatal.
+ //else radioClock->wait();
+}
+
+
+
+void Transceiver::writeClockInterface()
+{
+ char command[50];
+ // FIXME -- This should be adaptive.
+ sprintf(command,"IND CLOCK %llu",(unsigned long long) (mTransmitDeadlineClock.FN()+2));
+
+ LOG(INFO) << "ClockInterface: sending " << command;
+
+ mClockSocket.write(command,strlen(command)+1);
+
+ mLastClockUpdateTime = mTransmitDeadlineClock;
+
+}
+
+
+
+
+void *FIFOServiceLoopAdapter(Transceiver *transceiver)
+{
+ while (1) {
+ transceiver->driveReceiveFIFO();
+ transceiver->driveTransmitFIFO();
+ pthread_testcancel();
+ }
+ return NULL;
+}
+
+void *ControlServiceLoopAdapter(Transceiver *transceiver)
+{
+ while (1) {
+ transceiver->driveControl();
+ pthread_testcancel();
+ }
+ return NULL;
+}
+
+void *TransmitPriorityQueueServiceLoopAdapter(Transceiver *transceiver)
+{
+ while (1) {
+ bool stale = false;
+ // Flush the UDP packets until a successful transfer.
+ while (!transceiver->driveTransmitPriorityQueue()) {
+ stale = true;
+ }
+ if (stale) {
+ // If a packet was stale, remind the GSM stack of the clock.
+ transceiver->writeClockInterface();
+ }
+ pthread_testcancel();
+ }
+ return NULL;
+}