| /* |
| * 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/>. |
| */ |
| |
| #include <stdio.h> |
| #include "Transceiver.h" |
| #include <Logger.h> |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| using namespace GSM; |
| |
| #define USB_LATENCY_INTRVL 10,0 |
| |
| #if USE_UHD |
| # define USB_LATENCY_MIN 6,7 |
| #else |
| # define USB_LATENCY_MIN 1,1 |
| #endif |
| |
| /* Number of running values use in noise average */ |
| #define NOISE_CNT 20 |
| |
| TransceiverState::TransceiverState() |
| { |
| for (int i = 0; i < 8; i++) { |
| chanType[i] = Transceiver::NONE; |
| fillerModulus[i] = 26; |
| chanResponse[i] = NULL; |
| DFEForward[i] = NULL; |
| DFEFeedback[i] = NULL; |
| |
| for (int n = 0; n < 102; n++) |
| fillerTable[n][i] = NULL; |
| } |
| } |
| |
| TransceiverState::~TransceiverState() |
| { |
| for (int i = 0; i < 8; i++) { |
| delete chanResponse[i]; |
| delete DFEForward[i]; |
| delete DFEFeedback[i]; |
| |
| for (int n = 0; n < 102; n++) |
| delete fillerTable[n][i]; |
| } |
| } |
| |
| void TransceiverState::init(size_t slot, signalVector *burst) |
| { |
| for (int i = 0; i < 102; i++) |
| fillerTable[i][slot] = new signalVector(*burst); |
| } |
| |
| Transceiver::Transceiver(int wBasePort, |
| const char *TRXAddress, |
| int wSPS, |
| GSM::Time wTransmitLatency, |
| RadioInterface *wRadioInterface) |
| : mBasePort(wBasePort), mAddr(TRXAddress), |
| mDataSocket(NULL), mCtrlSocket(NULL), mClockSocket(NULL), |
| mSPSTx(wSPS), mSPSRx(1), mNoises(NOISE_CNT) |
| { |
| GSM::Time startTime(random() % gHyperframe,0); |
| |
| mRxServiceLoopThread = new Thread(32768); |
| mTxServiceLoopThread = new Thread(32768); |
| mControlServiceLoopThread = new Thread(32768); ///< thread to process control messages from GSM core |
| mTransmitPriorityQueueServiceLoopThread = new Thread(32768);///< thread to process transmit bursts from GSM core |
| |
| mRadioInterface = wRadioInterface; |
| mTransmitLatency = wTransmitLatency; |
| mTransmitDeadlineClock = startTime; |
| mLastClockUpdateTime = startTime; |
| mLatencyUpdateTime = startTime; |
| mRadioInterface->getClock()->set(startTime); |
| mMaxExpectedDelay = 0; |
| |
| txFullScale = mRadioInterface->fullScaleInputValue(); |
| rxFullScale = mRadioInterface->fullScaleOutputValue(); |
| |
| mOn = false; |
| mTxFreq = 0.0; |
| mRxFreq = 0.0; |
| mPower = -10; |
| mNoiseLev = 0.0; |
| } |
| |
| Transceiver::~Transceiver() |
| { |
| sigProcLibDestroy(); |
| mTransmitPriorityQueue.clear(); |
| |
| delete mClockSocket; |
| delete mCtrlSocket; |
| delete mDataSocket; |
| } |
| |
| bool Transceiver::init() |
| { |
| signalVector *burst; |
| |
| if (!sigProcLibSetup(mSPSTx)) { |
| LOG(ALERT) << "Failed to initialize signal processing library"; |
| return false; |
| } |
| |
| mClockSocket = new UDPSocket(mBasePort, mAddr.c_str(), mBasePort + 100); |
| mCtrlSocket = new UDPSocket(mBasePort + 1, mAddr.c_str(), mBasePort + 101); |
| mDataSocket = new UDPSocket(mBasePort + 2, mAddr.c_str(), mBasePort + 102); |
| |
| for (size_t n = 0; n < 8; n++) { |
| burst = modulateBurst(gDummyBurst, 8 + (n % 4 == 0), mSPSTx); |
| scaleVector(*burst, txFullScale); |
| mState.init(n, burst); |
| mState.chanEstimateTime[n] = mTransmitDeadlineClock; |
| |
| delete burst; |
| } |
| |
| return true; |
| } |
| |
| void Transceiver::addRadioVector(BitVector &burst, |
| int RSSI, |
| GSM::Time &wTime) |
| { |
| // modulate and stick into queue |
| signalVector* modBurst = modulateBurst(burst, |
| 8 + (wTime.TN() % 4 == 0), |
| mSPSTx); |
| scaleVector(*modBurst,txFullScale * pow(10,-RSSI/10)); |
| radioVector *newVec = new radioVector(*modBurst,wTime); |
| mTransmitPriorityQueue.write(newVec); |
| |
| delete modBurst; |
| } |
| |
| 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->getTime(); |
| int TN = nextTime.TN(); |
| int modFN = nextTime.FN() % mState.fillerModulus[TN]; |
| delete mState.fillerTable[modFN][TN]; |
| mState.fillerTable[modFN][TN] = staleBurst; |
| } |
| |
| int TN = nowTime.TN(); |
| int modFN = nowTime.FN() % mState.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 mState.fillerTable[modFN][TN]; |
| mState.fillerTable[modFN][TN] = new signalVector(*(next)); |
| mRadioInterface->driveTransmitRadio(*(next), mState.chanType[TN] == NONE); |
| delete next; |
| return; |
| } |
| |
| // otherwise, pull filler data, and push to radio FIFO |
| mRadioInterface->driveTransmitRadio(*(mState.fillerTable[modFN][TN]), |
| mState.chanType[TN]==NONE); |
| } |
| |
| void Transceiver::setModulus(int timeslot) |
| { |
| switch (mState.chanType[timeslot]) { |
| case NONE: |
| case I: |
| case II: |
| case III: |
| case FILL: |
| mState.fillerModulus[timeslot] = 26; |
| break; |
| case IV: |
| case VI: |
| case V: |
| mState.fillerModulus[timeslot] = 51; |
| break; |
| //case V: |
| case VII: |
| mState.fillerModulus[timeslot] = 102; |
| break; |
| case XIII: |
| mState.fillerModulus[timeslot] = 52; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| |
| Transceiver::CorrType Transceiver::expectedCorrType(GSM::Time currTime) |
| { |
| |
| unsigned burstTN = currTime.TN(); |
| unsigned burstFN = currTime.FN(); |
| |
| switch (mState.chanType[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: |
| 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 XIII: { |
| int mod52 = burstFN % 52; |
| if ((mod52 == 12) || (mod52 == 38)) |
| return RACH; |
| else if ((mod52 == 25) || (mod52 == 51)) |
| 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 = false, success = false, estimateChannel = false; |
| complex amp = 0.0; |
| float TOA = 0.0, avg = 0.0; |
| signalVector *chanResponse; |
| |
| radioVector *rxBurst = (radioVector *) mReceiveFIFO->get(); |
| |
| if (!rxBurst) return NULL; |
| |
| int timeslot = rxBurst->getTime().TN(); |
| |
| CorrType corrType = expectedCorrType(rxBurst->getTime()); |
| |
| if ((corrType==OFF) || (corrType==IDLE)) { |
| delete rxBurst; |
| return NULL; |
| } |
| |
| signalVector *vectorBurst = rxBurst; |
| |
| energyDetect(*vectorBurst, 20 * mSPSRx, 0.0, &avg); |
| |
| // Update noise level |
| mNoiseLev = mNoises.avg(); |
| avg = sqrt(avg); |
| |
| // run the proper correlator |
| if (corrType==TSC) { |
| LOG(DEBUG) << "looking for TSC at time: " << rxBurst->getTime(); |
| double framesElapsed = rxBurst->getTime() - mState.chanEstimateTime[timeslot]; |
| if ((framesElapsed > 50) || (!mState.chanResponse[timeslot])) { |
| delete mState.chanResponse[timeslot]; |
| delete mState.DFEForward[timeslot]; |
| delete mState.DFEFeedback[timeslot]; |
| |
| mState.chanResponse[timeslot] = NULL; |
| mState.DFEForward[timeslot] = NULL; |
| mState.DFEFeedback[timeslot] = NULL; |
| |
| if (needDFE) |
| estimateChannel = true; |
| } |
| |
| float chanOffset; |
| success = analyzeTrafficBurst(*vectorBurst, |
| mTSC, |
| 5.0, |
| mSPSRx, |
| &, |
| &TOA, |
| mMaxExpectedDelay, |
| estimateChannel, |
| &chanResponse, |
| &chanOffset); |
| if (success) { |
| mState.SNRestimate[timeslot] = amp.norm2() / (mNoiseLev * mNoiseLev+1.0); |
| if (estimateChannel) { |
| mState.chanResponse[timeslot] = chanResponse; |
| mState.chanRespOffset[timeslot] = chanOffset; |
| mState.chanRespAmplitude[timeslot] = amp; |
| scaleVector(*chanResponse, complex(1.0,0.0) / amp); |
| |
| designDFE(*chanResponse, mState.SNRestimate[timeslot], 7, |
| &mState.DFEForward[timeslot], |
| &mState.DFEFeedback[timeslot]); |
| |
| mState.chanEstimateTime[timeslot] = rxBurst->getTime(); |
| } |
| } |
| else { |
| mState.chanResponse[timeslot] = NULL; |
| mNoises.insert(avg); |
| } |
| } |
| else { |
| // RACH burst |
| if (success = detectRACHBurst(*vectorBurst, 6.0, mSPSRx, &, &TOA)) |
| mState.chanResponse[timeslot] = NULL; |
| else |
| mNoises.insert(avg); |
| } |
| |
| // demodulate burst |
| SoftVector *burst = NULL; |
| if ((rxBurst) && (success)) { |
| if ((corrType==RACH) || (!needDFE)) { |
| burst = demodulateBurst(*vectorBurst, mSPSRx, amp, TOA); |
| } else { |
| scaleVector(*vectorBurst,complex(1.0,0.0) / amp); |
| burst = equalizeBurst(*vectorBurst, |
| TOA - mState.chanRespOffset[timeslot], |
| mSPSRx, |
| *mState.DFEForward[timeslot], |
| *mState.DFEFeedback[timeslot]); |
| } |
| wTime = rxBurst->getTime(); |
| RSSI = (int) floor(20.0*log10(rxFullScale/avg)); |
| LOG(DEBUG) << "RSSI: " << RSSI; |
| timingOffset = (int) round(TOA * 256.0 / mSPSRx); |
| } |
| |
| //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 = mCtrlSocket->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(); |
| |
| // Start radio interface threads. |
| mTxServiceLoopThread->start((void * (*)(void*))TxServiceLoopAdapter,(void*) this); |
| mRxServiceLoopThread->start((void * (*)(void*))RxServiceLoopAdapter,(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/mNoiseLev))); |
| } |
| 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(dbPwr); |
| 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(mSPSRx, 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; |
| } |
| mState.chanType[timeslot] = corrCode; |
| setModulus(timeslot); |
| sprintf(response,"RSP SETSLOT 0 %d %d",timeslot,corrCode); |
| |
| } |
| else { |
| LOG(WARNING) << "bogus command " << command << " on control interface."; |
| } |
| |
| mCtrlSocket->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->getWindowType() == RadioDevice::TX_WINDOW_USRP1) { |
| if (mRadioInterface->isUnderrun()) { |
| // only update latency at the defined frame interval |
| if (radioClock->get() > mLatencyUpdateTime + GSM::Time(USB_LATENCY_INTRVL)) { |
| 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(USB_LATENCY_MIN)) { |
| 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(); |
| } |
| } |
| |
| 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 *RxServiceLoopAdapter(Transceiver *transceiver) |
| { |
| transceiver->setPriority(); |
| |
| while (1) { |
| transceiver->driveReceiveFIFO(); |
| pthread_testcancel(); |
| } |
| return NULL; |
| } |
| |
| void *TxServiceLoopAdapter(Transceiver *transceiver) |
| { |
| while (1) { |
| 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; |
| } |