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osmo-trx/Transceiver52M/Transceiver2.cpp

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/*
* 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 "BitVector.h"
#include "osmocom/core/bits.h"
#include <stdio.h>
#include <Logger.h>
#include "Transceiver2.h"
extern "C" {
#include "sch.h"
}
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "l1if.h"
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
/* Clock indication interval in frames */
#define CLK_IND_INTERVAL 100
/* Number of running values use in noise average */
#define NOISE_CNT 20
#define FREQ_CNT 20
TransceiverState::TransceiverState()
: mRetrans(false), mFreqOffsets(FREQ_CNT), mode(Transceiver2::TRX_MODE_OFF)
{
for (int i = 0; i < 8; i++) {
chanType[i] = Transceiver2::NONE;
fillerModulus[i] = 26;
prevFrame[i] = NULL;
for (int n = 0; n < 102; n++)
fillerTable[n][i] = NULL;
}
}
TransceiverState::~TransceiverState()
{
for (int i = 0; i < 8; i++) {
for (int n = 0; n < 102; n++)
delete fillerTable[n][i];
}
}
void TransceiverState::init(size_t slot, signalVector *burst, bool fill)
{
signalVector *filler;
for (int i = 0; i < 102; i++) {
if (fill)
filler = new signalVector(*burst);
else
filler = new signalVector(burst->size());
fillerTable[i][slot] = filler;
}
}
extern void initvita();
Transceiver2::Transceiver2(int wBasePort,
const char *TRXAddress,
size_t wSPS, size_t wChans,
GSM::Time wTransmitLatency,
RadioInterface *wRadioInterface)
: rx_sps(4), tx_sps(4), mAddr(TRXAddress),
mTransmitLatency(wTransmitLatency),
mRadioInterface(wRadioInterface), mChans(wChans),
mOn(false), mTxFreq(0.0), mRxFreq(0.0), mPower(-10), mMaxExpectedDelay(0),
mBSIC(-1)
{
GSM::Time startTime(random() % gHyperframe,0);
mLowerLoopThread = new Thread(32768);
mTransmitDeadlineClock = startTime;
mLastClockUpdateTime = startTime;
mLatencyUpdateTime = startTime;
mRadioInterface->getClock()->set(startTime);
txFullScale = mRadioInterface->fullScaleInputValue();
rxFullScale = mRadioInterface->fullScaleOutputValue();
for (int i = 0; i < 8; i++)
mRxSlotMask[i] = 0;
initvita();
}
Transceiver2::~Transceiver2()
{
stop();
sigProcLibDestroy();
for (size_t i = 0; i < mChans; i++) {
mTxPriorityQueues[i].clear();
}
}
bool Transceiver2::init(bool filler)
{
if (!mChans) {
LOG(ALERT) << "No channels assigned";
return false;
}
if (!sigProcLibSetup()) {
LOG(ALERT) << "Failed to initialize signal processing library";
return false;
}
mControlServiceLoopThreads.resize(mChans);
mTxPriorityQueueServiceLoopThreads.resize(mChans);
mRxServiceLoopThreads.resize(mChans);
mTxPriorityQueues.resize(mChans);
mReceiveFIFO.resize(mChans);
mStates.resize(mChans);
/* Filler table retransmissions - support only on channel 0 */
if (filler)
mStates[0].mRetrans = true;
for (size_t i = 0; i < mChans; i++) {
mControlServiceLoopThreads[i] = new Thread(32768);
mTxPriorityQueueServiceLoopThreads[i] = new Thread(32768);
mRxServiceLoopThreads[i] = new Thread(32768);
for (size_t n = 0; n < 8; n++) {
// burst = modulateBurst(gDummyBurst, 8 + (n % 4 == 0), tx_sps);
// scaleVector(*burst, txFullScale);
// mStates[i].init(n, burst, filler && !i);
// delete burst;
}
}
return true;
}
void Transceiver2::addRadioVector(size_t chan, BitVector &bits,
int RSSI, GSM::Time &wTime)
{
signalVector *burst;
radioVector *radio_burst;
if (chan >= mTxPriorityQueues.size()) {
LOG(ALERT) << "Invalid channel " << chan;
return;
}
if (wTime.TN() > 7) {
LOG(ALERT) << "Received burst with invalid slot " << wTime.TN();
return;
}
if (mStates[0].mode != TRX_MODE_BTS)
return;
burst = modulateBurst(bits, 8 + (wTime.TN() % 4 == 0), tx_sps);
scaleVector(*burst, txFullScale * pow(10, -RSSI / 10));
radio_burst = new radioVector(wTime, burst);
mTxPriorityQueues[chan].write(radio_burst);
}
void Transceiver2::updateFillerTable(size_t chan, radioVector *burst)
{
int TN, modFN;
TransceiverState *state = &mStates[chan];
TN = burst->getTime().TN();
modFN = burst->getTime().FN() % state->fillerModulus[TN];
delete state->fillerTable[modFN][TN];
state->fillerTable[modFN][TN] = burst->getVector();
burst->setVector(NULL);
}
void Transceiver2::pushRadioVector(GSM::Time &nowTime)
{
int TN, modFN;
radioVector *burst;
TransceiverState *state;
std::vector<signalVector *> bursts(mChans);
std::vector<bool> zeros(mChans, false);
std::vector<bool> filler(mChans, true);
for (size_t i = 0; i < mChans; i ++) {
state = &mStates[i];
while ((burst = mTxPriorityQueues[i].getStaleBurst(nowTime))) {
LOG(NOTICE) << "dumping STALE burst in TRX->USRP interface";
if (state->mRetrans)
updateFillerTable(i, burst);
delete burst;
}
TN = nowTime.TN();
modFN = nowTime.FN() % state->fillerModulus[TN];
bursts[i] = state->fillerTable[modFN][TN];
if (state->mode == TRX_MODE_BTS)
zeros[i] = state->chanType[TN] == NONE;
if ((burst = mTxPriorityQueues[i].getCurrentBurst(nowTime))) {
bursts[i] = burst->getVector();
if (state->mRetrans) {
updateFillerTable(i, burst);
} else {
burst->setVector(NULL);
filler[i] = false;
}
delete burst;
}
}
mRadioInterface->driveTransmitRadio(bursts, zeros);
for (size_t i = 0; i < mChans; i++) {
if (!filler[i])
delete bursts[i];
}
}
void Transceiver2::setModulus(size_t timeslot, size_t chan)
{
TransceiverState *state = &mStates[chan];
switch (state->chanType[timeslot]) {
case NONE:
case I:
case II:
case III:
case FILL:
state->fillerModulus[timeslot] = 26;
break;
case IV:
case VI:
case V:
state->fillerModulus[timeslot] = 51;
break;
//case V:
case VII:
state->fillerModulus[timeslot] = 102;
break;
case XIII:
state->fillerModulus[timeslot] = 52;
break;
default:
break;
}
}
CorrType Transceiver2::expectedCorrType(GSM::Time currTime,
size_t chan)
{
TransceiverState *state = &mStates[chan];
unsigned burstTN = currTime.TN();
unsigned burstFN = currTime.FN();
if (state->mode == TRX_MODE_MS_TRACK) {
/* 102 modulus case currently unhandled */
if (state->fillerModulus[burstTN] > 52)
return OFF;
int modFN = burstFN % state->fillerModulus[burstTN];
unsigned long long reg = (unsigned long long) 1 << modFN;
if (reg & mRxSlotMask[burstTN])
return TSC;
else
return OFF;
}
switch (state->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;
}
}
/* Detect SCH synchronization sequence within a burst */
bool Transceiver2::detectSCH(TransceiverState *state,
signalVector &burst,
struct estim_burst_params *ebp)
{
int shift;
sch_detect_type full;
float mag, threshold = 5.0;
full = (state->mode == TRX_MODE_MS_TRACK) ?
sch_detect_type::SCH_DETECT_NARROW : sch_detect_type::SCH_DETECT_FULL;
if (!detectSCHBurst(burst, threshold, rx_sps, full, ebp))
return false;
std::clog << "SCH : Timing offset " << ebp->toa << " symbols" << std::endl;
mag = fabsf(ebp->toa);
if (mag < 1.0f)
return true;
shift = (int) (mag / 2.0f);
if (!shift)
shift++;
shift = ebp->toa > 0 ? shift : -shift;
std::clog << "SCH : shift -> " << shift << " symbols" << std::endl;
mRadioInterface->applyOffset(shift);
return false;
}
#define SCH_BIT_SCALE 64
/* Decode SCH burst */
bool Transceiver2::decodeSCH(SoftVector *burst, GSM::Time *time)
{
int fn;
struct sch_info sch;
ubit_t info[GSM_SCH_INFO_LEN];
sbit_t data[GSM_SCH_CODED_LEN];
if (burst->size() < 156) {
std::clog << "Invalid SCH burst length" << std::endl;
return false;
}
float_to_sbit(&(*burst)[3], &data[0], SCH_BIT_SCALE, 39);
float_to_sbit(&(*burst)[106], &data[39], SCH_BIT_SCALE, 39);
if (!gsm_sch_decode(info, data)) {
gsm_sch_parse(info, &sch);
mBSIC = sch.bsic;
mTSC = mBSIC & 0x7;
// std::clog << "SCH : Decoded values" << std::endl;
// std::clog << " BSIC: " << sch.bsic << std::endl;
// std::clog << " T1 : " << sch.t1 << std::endl;
// std::clog << " T2 : " << sch.t2 << std::endl;
// std::clog << " T3p : " << sch.t3p << std::endl;
// std::clog << " FN : " << gsm_sch_to_fn(&sch) << std::endl;
fn = gsm_sch_to_fn(&sch);
if (fn < 0) {
std::clog << "SCH : Failed to convert FN " << std::endl;
return false;
}
time->FN(fn);
time->TN(0);
} else {
std::clog << "Invalid SCH decode!!" << std::endl;
return false;
}
return true;
}
#define FCCH_OFFSET_LIMIT 5e3
#define FCCH_ADJUST_LIMIT 20.0
/* Apply FCCH frequency correction */
bool Transceiver2::correctFCCH(TransceiverState *state, signalVector *burst)
{
double offset;
if (!burst)
return false;
offset = gsm_fcch_offset((float *) burst->begin(), burst->size());
//std::cout << "XXXX FCCH: Frequency offset " << offset << " Hz" << std::endl;
if (offset > FCCH_OFFSET_LIMIT)
return false;
state->mFreqOffsets.insert(offset);
if (state->mFreqOffsets.full()) {
double avg = state->mFreqOffsets.avg();
std::clog << "FCCH: Frequency offset " << avg << " Hz" << std::endl;
if (fabs(avg) > FCCH_ADJUST_LIMIT) {
mRadioInterface->tuneRxOffset(-avg);
state->mFreqOffsets.reset();
}
}
return true;
}
extern int process_vita_burst(std::complex<float>* input, int tsc, unsigned char* output_binary);
/*
* Pull bursts from the FIFO and handle according to the slot
* and burst correlation type. Equalzation is currently disabled.
*/
SoftVector *Transceiver2::pullRadioVector(GSM::Time &wTime, int &RSSI,
int &timingOffset, size_t chan) __attribute__((optnone))
{
struct estim_burst_params ebp;
int rc;
float pow, max = -1.0, avg = 1.0;
int max_i = -1;
signalVector *burst;
SoftVector *bits = NULL;
TransceiverState *state = &mStates[chan];
bool printme = 0;
GSM::Time sch_time, burst_time, diff_time;
/* Blocking FIFO read */
radioVector *radio_burst = mReceiveFIFO[chan]->read();
if (!radio_burst)
return NULL;
/* Set time and determine correlation type */
burst_time = radio_burst->getTime();
#if 0
if (state->mode == TRX_MODE_MS_ACQUIRE) {
switch(fbsb_acq_buf.s.load()) {
case fbsb_par::fbsb_state::IDLE:
case fbsb_par::fbsb_state::INIT:
fbsb_acq_buf.s.store(fbsb_par::fbsb_state::ACQ);
case fbsb_par::fbsb_state::ACQ:
fbsb_acq_buf.take(radio_burst->getVector()->begin(), radio_burst->getVector()->size(), burst_time);
if(!fbsb_acq_buf.done()) {
delete radio_burst;
return nullptr;
}
fbsb_acq_buf.s.store(fbsb_par::fbsb_state::ACQ_COMPL);
// break;
case fbsb_par::fbsb_state::ACQ_COMPL:
{
complex famp = 0;
int found_index;
auto foundat = fbsb_acq_buf.fcch(&famp, &found_index, false);
std::cerr << "@ " << found_index << std::endl;
foundat = found_index;
auto framelen = (3 + 142 + 3 + 8.25); // 1sps!;
int searchbegin = 8*framelen-20;
int searchend = 10*framelen+20;
if(famp.abs() < 2000 || foundat+searchend > fbsb_acq_buf.sz()) {
mReceiveFIFO[chan]->clear();
delete radio_burst;
fbsb_acq_buf.reset();
fbsb_acq_buf.s.store(fbsb_par::fbsb_state::ACQ);
return nullptr;
}
correctFCCH_raw(state, &fbsb_acq_buf.fbsb_buf[foundat], 98);
burst = new signalVector(searchend-searchbegin, GSM::gRACHSynchSequence.size());
// burst = new signalVector(fbsb_acq_buf.fbsb_buf, foundat+searchbegin, searchend-searchbegin);
memcpy(burst->begin(), &fbsb_acq_buf.fbsb_buf[foundat+searchbegin], (searchend-searchbegin) * sizeof(complex));
success = detectSCH(state, *burst, amp, toa, 0); // will "fail" if sample adjustment is required
std::cerr << "###detected sch: " << success << "at toa " << toa << std::endl;
mReceiveFIFO[chan]->clear();
delete radio_burst;
if(toa > 0) {
int how_many_ts = (found_index+searchbegin)/framelen;
// int how_many_fn = how_many_ts/8;
auto t = fbsb_acq_buf.rcvClock[how_many_ts];
diff_time = GSM::Time(sch_time.FN() - t.FN(),-t.TN());
mRadioInterface->adjustClock(diff_time);
mTransmitDeadlineClock = RadioClock::adjust(
mTransmitDeadlineClock,
diff_time);
}
if(!success) {
fbsb_acq_buf.reset();
fbsb_acq_buf.s.store(fbsb_par::fbsb_state::ACQ);
}
else
fbsb_acq_buf.s.store(fbsb_par::fbsb_state::DONE);
return nullptr;
}
case fbsb_par::fbsb_state::DONE:
break;
default:
// fbsb_acq_buf.s = fbsb_par::fbsb_state::WAIT;
return nullptr;
break;
/* no-op */
}
}
#endif
CorrType type = expectedCorrType(burst_time, chan);
switch (state->mode) {
case TRX_MODE_MS_ACQUIRE:
type = SCH;
break;
case TRX_MODE_MS_TRACK:
if (gsm_sch_check_fn(burst_time.FN()) && burst_time.TN() == 0)
type = SCH;
else if(burst_time.TN() == 0 && !gsm_fcch_check_fn(burst_time.FN())) // all ts0, but not fcch or sch..
type = TSC;
else if (type == OFF)
goto release;
break;
case TRX_MODE_BTS:
if ((type == TSC) || (type == RACH))
break;
case TRX_MODE_OFF:
default:
goto release;
}
/* Select the diversity channel with highest energy */
for (size_t i = 0; i < radio_burst->chans(); i++) {
float pow = energyDetect(*radio_burst->getVector(i), 20 * rx_sps);
if (pow > max) {
max = pow;
max_i = i;
}
avg += pow;
}
if (max_i < 0) {
LOG(ALERT) << "Received empty burst";
goto release;
}
/* Average noise on diversity paths and update global levels */
burst = radio_burst->getVector(max_i);
avg = sqrt(avg / radio_burst->chans());
/* Detect normal or RACH bursts */
if (type == SCH) {
rc = detectSCH(state, *burst, &ebp);
rc = rc > 0 ? rc : -1;
} else {
rc = detectAnyBurst(*burst, mTSC, BURST_THRESH, rx_sps, type, mMaxExpectedDelay, &ebp);
if(rc > 0) {
type = (CorrType)rc;
}
}
if (rc < 0)
goto release;
if(type == TSC){
unsigned char outbin[148];
auto start = reinterpret_cast<float*>(burst->begin());
for(int i=0; i < 625*2; i++)
start[i] *= 1./32767.;
int ret = process_vita_burst(reinterpret_cast<std::complex<float>*>(burst->begin()), mTSC, outbin);
bits = new SoftVector();
bits->resize(148);
for(int i=0; i < 148; i++)
(*bits)[i] = outbin[i] < 1 ? -1 : 1;
// printme = ret >= 0 ? true : false;
// if(printme) {
// std::cerr << std::endl << "vita:" << std::endl;
// for(auto i : outbin)
// std::cerr << (int) i;
// std::cerr << std::endl << "org:" << std::endl;
// }
} else {
/* Ignore noise threshold on MS mode for now */
//if ((type == SCH) || (avg - state->mNoiseLev > 0.0))
bits = demodAnyBurst(*burst, type, rx_sps, &ebp);
// if(printme)
// for(int i=0; i < 148; i++)
// std::cerr << (int) (bits->operator[](i) > 0 ? 1 : 0);
}
/* MS: Decode SCH and adjust GSM clock */
if ((type != TSC) &&
((state->mode == TRX_MODE_MS_ACQUIRE) ||
(state->mode == TRX_MODE_MS_TRACK))) {
correctFCCH(state, state->prevFrame[burst_time.TN()]->getVector());
if (decodeSCH(bits, &sch_time)) {
if (state->mode == TRX_MODE_MS_ACQUIRE) {
diff_time = GSM::Time(sch_time.FN() - burst_time.FN(),
-burst_time.TN());
mRadioInterface->adjustClock(diff_time);
mTransmitDeadlineClock = RadioClock::adjust(
mTransmitDeadlineClock,
diff_time);
state->mode = TRX_MODE_MS_TRACK;
burst_time = sch_time; //sch bits passed up might have a different time, so upper layers complain
std::clog << "SCH : Locking GSM clock " << std::endl;
} else {
//std::clog << "SCH : Read SCH at FN " << burst_time.FN() << " FN51 " << burst_time.FN() % 51 << std::endl;
wTime = burst_time;
RSSI = (int) floor(20.0 * log10(rxFullScale / avg));
timingOffset = (int) round(ebp.toa * 256.0 / rx_sps);
return bits;
}
}
else
std::clog << "SCH : FAIL!!!!! SCH at FN " << burst_time.FN() << std::endl;
goto release;
}
wTime = burst_time;
RSSI = (int) floor(20.0 * log10(rxFullScale / avg));
timingOffset = (int) round(ebp.toa * 256.0 / rx_sps);
delete state->prevFrame[burst_time.TN()];
state->prevFrame[burst_time.TN()] = radio_burst;
return bits;
release:
delete state->prevFrame[burst_time.TN()];
state->prevFrame[burst_time.TN()] = radio_burst;
delete bits;
return NULL;
}
void Transceiver2::start()
{
TransceiverChannel *chan;
for (size_t i = 0; i < mControlServiceLoopThreads.size(); i++) {
chan = new TransceiverChannel(this, i);
mControlServiceLoopThreads[i]->start((void * (*)(void*))
ControlServiceLoopAdapter, (void*) chan);
}
}
void Transceiver2::stop()
{
if (!mOn)
return;
LOG(NOTICE) << "Stopping the transceiver";
mLowerLoopThread->cancel();
mLowerLoopThread->join();
delete mLowerLoopThread;
for (size_t i = 0; i < mChans; i++) {
mRxServiceLoopThreads[i]->cancel();
mTxPriorityQueueServiceLoopThreads[i]->cancel();
}
LOG(INFO) << "Stopping the device";
mRadioInterface->stop();
for (size_t i = 0; i < mChans; i++) {
mRxServiceLoopThreads[i]->join();
mTxPriorityQueueServiceLoopThreads[i]->join();
delete mRxServiceLoopThreads[i];
delete mTxPriorityQueueServiceLoopThreads[i];
mTxPriorityQueues[i].clear();
}
mOn = false;
LOG(NOTICE) << "Transceiver stopped";
}
void Transceiver2::reset()
{
for (size_t i = 0; i < mTxPriorityQueues.size(); i++)
mTxPriorityQueues[i].clear();
}
void Transceiver2::driveControl(size_t chan)
{
//char response[MAX_PACKET_LENGTH];
// check control socket
// char buffer[MAX_PACKET_LENGTH];
// int msgLen = -1;
// buffer[0] = '\0';
//// msgLen = mCtrlSockets[chan]->read(buffer);
// if (msgLen < 1) {
// return;
// }
auto m = pop_c();
if(!m)
return;
auto response = (TRX_C*)malloc(sizeof(TRX_C));
response->cmd[0] = '\0';
commandhandler(m->cmd, response->cmd, chan);
free(m);
std::clog << "response is " << response->cmd << std::endl;
push_c(response);
//mCtrlSockets[chan]->write(response, strlen(response) + 1);
}
void Transceiver2::commandhandler(char* buffer, char* response, int chan)
{
int MAX_PACKET_LENGTH = TRXC_BUF_SIZE;
char cmdcheck[4];
char command[MAX_PACKET_LENGTH];
sscanf(buffer,"%3s %s",cmdcheck,command);
if (!chan)
writeClockInterface();
if (strcmp(cmdcheck,"CMD")!=0) {
LOG(WARNING) << "bogus message on control interface";
return;
}
std::clog << "command is " << buffer << std::endl << std::flush;
if (strcmp(command,"MEASURE")==0) {
msleep(100);
int freq;
sscanf(buffer,"%3s %s %d",cmdcheck,command,&freq);
sprintf(response,"RSP MEASURE 0 %d -80",freq);
}
else if (strcmp(command,"ECHO")==0) {
msleep(100);
sprintf(response,"RSP ECHO 0");
}
else 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 (!chan && !mOn) {
// Prepare for thread start
mPower = -20;
mRadioInterface->start();
// Start radio interface threads.
mLowerLoopThread->start((void * (*)(void*))
LowerLoopAdapter,(void*) this);
for (size_t i = 0; i < mChans; i++) {
TransceiverChannel *chan = new TransceiverChannel(this, i);
mRxServiceLoopThreads[i]->start((void * (*)(void*))
RxUpperLoopAdapter, (void*) chan);
// chan = new TransceiverChannel(this, i);
// mTxPriorityQueueServiceLoopThreads[i]->start((void * (*)(void*))
// TxUpperLoopAdapter, (void*) chan);
}
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, chan);
sprintf(response,"RSP SETRXGAIN 0 %d",newGain);
}
else if (strcmp(command,"NOISELEV")==0) {
if (mOn) {
float lev = 0;//mStates[chan].mNoiseLev;
sprintf(response,"RSP NOISELEV 0 %d",
(int) round(20.0 * log10(rxFullScale / lev)));
}
else {
sprintf(response,"RSP NOISELEV 1 0");
}
}
else if (!strcmp(command, "SETPOWER")) {
// 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(mPower, chan);
sprintf(response, "RSP SETPOWER 0 %d", dbPwr);
}
}
else if (!strcmp(command,"ADJPOWER")) {
// 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;
mRadioInterface->setPowerAttenuation(mPower, chan);
sprintf(response, "RSP ADJPOWER 0 %d", mPower);
}
}
else if (strcmp(command,"RXTUNE")==0) {
// tune receiver
int freqKhz;
sscanf(buffer,"%3s %s %d",cmdcheck,command,&freqKhz);
mRxFreq = freqKhz * 1e3;
if (!mRadioInterface->tuneRx(mRxFreq, chan)) {
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);
mTxFreq = freqKhz * 1e3;
if (!mRadioInterface->tuneTx(mTxFreq, chan)) {
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")) {
// set TSC
unsigned TSC;
sscanf(buffer, "%3s %s %d", cmdcheck, command, &TSC);
if (mOn)
sprintf(response, "RSP SETTSC 1 %d", TSC);
else if (chan && (TSC != mTSC))
sprintf(response, "RSP SETTSC 1 %d", TSC);
else {
mTSC = TSC;
//generateMidamble(rx_sps, TSC);
sprintf(response,"RSP SETTSC 0 %d", TSC);
}
}
else if (!strcmp(command,"GETBSIC")) {
if (mBSIC < 0)
sprintf(response, "RSP GETBSIC 1");
else
sprintf(response, "RSP GETBSIC 0 %d", mBSIC);
}
else if (strcmp(command,"SETSLOT")==0) {
// set TSC
int corrCode;
int timeslot;
sscanf(buffer,"%3s %s %d %d",cmdcheck,command,&timeslot,&corrCode);
if ((timeslot < 0) || (timeslot > 7)) {
LOG(WARNING) << "bogus message on control interface";
sprintf(response,"RSP SETSLOT 1 %d %d",timeslot,corrCode);
return;
}
mStates[chan].chanType[timeslot] = (ChannelCombination) corrCode;
setModulus(timeslot, chan);
sprintf(response,"RSP SETSLOT 0 %d %d",timeslot,corrCode);
}
else if (!strcmp(command,"SETRXMASK")) {
int slot;
unsigned long long mask;
sscanf(buffer,"%3s %s %d 0x%llx", cmdcheck, command, &slot, &mask);
if ((slot < 0) || (slot > 7)) {
sprintf(response, "RSP SETRXMASK 1");
} else {
mRxSlotMask[slot] = mask;
sprintf(response, "RSP SETRXMASK 0 %d 0x%llx", slot, mask);
}
}
else if (!strcmp(command, "SYNC")) {
msleep(10);
mStates[0].mode = TRX_MODE_MS_ACQUIRE;
sprintf(response,"RSP SYNC 0");
mMaxExpectedDelay = 10;
mRadioInterface->setRxGain(30, 0);
msleep(10);
}
else {
LOG(WARNING) << "bogus command " << command << " on control interface.";
}
//mCtrlSockets[chan]->write(response, strlen(response) + 1);
}
bool Transceiver2::driveTxPriorityQueue(size_t chan)
{
auto burst = pop_d();
if(!burst)
return true;
auto currTime = GSM::Time(burst->fn,burst->ts);
int RSSI = (int) burst->txlev;
static BitVector newBurst(gSlotLen);
BitVector::iterator itr = newBurst.begin();
auto *bufferItr = burst->symbols;
while (itr < newBurst.end())
*itr++ = *bufferItr++;
addRadioVector(chan, newBurst, RSSI, currTime);
free(burst);
return true;
// char buffer[gSlotLen+50];
// // check data socket
// size_t msgLen = mDataSockets[chan]->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]);
// 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(chan, newBurst, RSSI, currTime);
return true;
}
void Transceiver2::driveReceiveRadio()
{
if (!mRadioInterface->driveReceiveRadio())
usleep(100000);
}
void Transceiver2::driveReceiveFIFO(size_t chan)
{
SoftVector *rxBurst = NULL;
int RSSI;
int TOA; // in 1/256 of a symbol
GSM::Time burstTime;
rxBurst = pullRadioVector(burstTime, RSSI, TOA, chan);
if (rxBurst) {
auto response = (trxd_from_trx*)malloc(sizeof(trxd_from_trx));
#if 0
if( !gsm_fcch_check_fn(burstTime.FN()) && !gsm_sch_check_fn(burstTime.FN()))
std::cerr << "burst parameters: "
<< " time: " << burstTime
<< " RSSI: " << RSSI
<< " TOA: " << TOA
<< " bits: " << *rxBurst << std::endl;
#endif
response->ts = burstTime.TN();
response->fn = burstTime.FN();
response->rssi = RSSI;
response->toa = TOA;
SoftVector::const_iterator burstItr = rxBurst->begin();
if(gsm_sch_check_fn(burstTime.FN())) {
for (unsigned int i = 0; i < gSlotLen; i++)
((int8_t*)response->symbols)[i] = round(((*burstItr++)-0.5) * 64.0);
} else {
// invert and fix to +-127 sbits
for (int i = 0; i < 148; i++)
((int8_t*)response->symbols)[i] = *burstItr++ > 0.0f ? -127 : 127;
}
delete rxBurst;
push_d(response);
}
}
void Transceiver2::driveTxFIFO()
{
/**
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();
if (!mTransmitDeadlineClock.TN() &&
!(mTransmitDeadlineClock.FN() % CLK_IND_INTERVAL)) {
writeClockInterface();
}
}
}
radioClock->wait();
}
void Transceiver2::writeClockInterface()
{
mLastClockUpdateTime = mTransmitDeadlineClock;
}
void *RxUpperLoopAdapter(TransceiverChannel *chan)
{
Transceiver2 *trx = chan->trx;
size_t num = chan->num;
delete chan;
// trx->setPriority(0.42);
while (1) {
trx->driveReceiveFIFO(num);
pthread_testcancel();
}
return NULL;
}
void *LowerLoopAdapter(Transceiver2 *transceiver)
{
// transceiver->setPriority(0.45);
while (1) {
transceiver->driveReceiveRadio();
//transceiver->driveTxFIFO();
pthread_testcancel();
}
return NULL;
}
void *ControlServiceLoopAdapter(TransceiverChannel *chan)
{
Transceiver2 *trx = chan->trx;
size_t num = chan->num;
delete chan;
while (1) {
trx->driveControl(num);
pthread_testcancel();
}
return NULL;
}
void *TxUpperLoopAdapter(TransceiverChannel *chan)
{
Transceiver2 *trx = chan->trx;
size_t num = chan->num;
delete chan;
// trx->setPriority(0.40);
while (1) {
bool stale = false;
// Flush the UDP packets until a successful transfer.
while (!trx->driveTxPriorityQueue(num)) {
stale = true;
}
if (!num && stale) {
// If a packet was stale, remind the GSM stack of the clock.
trx->writeClockInterface();
}
pthread_testcancel();
}
return NULL;
}
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