From f2bdd1a24ca4f512b0d90f7cac55f5246238b5ce Mon Sep 17 00:00:00 2001
From: Alexander Chemeris <Alexander.Chemeris@gmail.com>
Date: Fri, 12 Jun 2015 00:15:31 -0400
Subject: transceiver: Add a debug option to dump selected timeslots to disk.

---
 Transceiver52M/Transceiver.cpp | 27 ++++++++++++++++++++++++++-
 Transceiver52M/Transceiver.h   |  1 +
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index f572987..8a53895 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -23,6 +23,7 @@
 
 #include <stdio.h>
 #include <iomanip>      // std::setprecision
+#include <fstream>
 #include "Transceiver.h"
 #include <Logger.h>
 
@@ -151,7 +152,7 @@ Transceiver::Transceiver(int wBasePort,
     mTransmitLatency(wTransmitLatency), mRadioInterface(wRadioInterface),
     rssiOffset(wRssiOffset),
     mSPSTx(wSPS), mSPSRx(1), mChans(wChans), mOn(false),
-    mTxFreq(0.0), mRxFreq(0.0), mTSC(0), mMaxExpectedDelay(0)
+    mTxFreq(0.0), mRxFreq(0.0), mTSC(0), mMaxExpectedDelay(0), mWriteBurstToDiskMask(0)
 {
   txFullScale = mRadioInterface->fullScaleInputValue();
   rxFullScale = mRadioInterface->fullScaleOutputValue();
@@ -616,6 +617,16 @@ SoftVector *Transceiver::demodulate(TransceiverState *state,
   return demodulateBurst(burst, mSPSRx, amp, toa);
 }
 
+void writeToFile(radioVector *radio_burst, size_t chan)
+{
+  GSM::Time time = radio_burst->getTime();
+  std::ostringstream fname;
+  fname << chan << "_" << time.FN() << "_" << time.TN() << ".fc";
+  std::ofstream outfile (fname.str().c_str(), std::ofstream::binary);
+  outfile.write((char*)radio_burst->getVector()->begin(), radio_burst->getVector()->size() * 2 * sizeof(float));
+  outfile.close();
+}
+
 /*
  * Pull bursts from the FIFO and handle according to the slot
  * and burst correlation type. Equalzation is currently disabled. 
@@ -643,6 +654,12 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime, double &RSSI, bool &i
   GSM::Time time = radio_burst->getTime();
   CorrType type = expectedCorrType(time, chan);
 
+  /* Debug: dump bursts to disk */
+  /* bits 0-7  - chan 0 timeslots
+   * bits 8-15 - chan 1 timeslots */
+  if (mWriteBurstToDiskMask & ((1<<time.TN()) << (8*chan)))
+    writeToFile(radio_burst, chan);
+
   /* No processing if the timeslot is off.
    * Not even power level or noise calculation. */
   if (type == OFF) {
@@ -858,6 +875,14 @@ void Transceiver::driveControl(size_t chan)
     sprintf(response,"RSP SETSLOT 0 %d %d",timeslot,corrCode);
 
   }
+  else if (strcmp(command,"_SETBURSTTODISKMASK")==0) {
+    // debug command! may change or disapear without notice
+    // set a mask which bursts to dump to disk
+    int mask;
+    sscanf(buffer,"%3s %s %d",cmdcheck,command,&mask);
+    mWriteBurstToDiskMask = mask;
+    sprintf(response,"RSP _SETBURSTTODISKMASK 0 %d",mask);
+  }
   else {
     LOG(WARNING) << "bogus command " << command << " on control interface.";
     sprintf(response,"RSP ERR 1");
diff --git a/Transceiver52M/Transceiver.h b/Transceiver52M/Transceiver.h
index 45d3980..2816ae5 100644
--- a/Transceiver52M/Transceiver.h
+++ b/Transceiver52M/Transceiver.h
@@ -232,6 +232,7 @@ private:
   double mRxFreq;                      ///< the receive frequency
   unsigned mTSC;                       ///< the midamble sequence code
   unsigned mMaxExpectedDelay;            ///< maximum expected time-of-arrival offset in GSM symbols
+  unsigned mWriteBurstToDiskMask;      ///< debug: bitmask to indicate which timeslots to dump to disk
 
   std::vector<TransceiverState> mStates;
 
-- 
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