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/*
* Copyright 2008, 2009 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 Flags
SWLOOPBACK compile for software loopback testing
*/
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include "Threads.h"
#include "DummyLoad.h"
#include <Logger.h>
using namespace std;
int DummyLoad::loadBurst(short *wDummyBurst, int len) {
dummyBurst = wDummyBurst;
dummyBurstSz = len;
}
DummyLoad::DummyLoad (double _desiredSampleRate)
{
LOG(INFO) << "creating USRP device...";
sampleRate = _desiredSampleRate;
}
void DummyLoad::updateTime(void) {
gettimeofday(&currTime,NULL);
double timeElapsed = (currTime.tv_sec - startTime.tv_sec)*1.0e6 +
(currTime.tv_usec - startTime.tv_usec);
currstamp = (TIMESTAMP) floor(timeElapsed/(1.0e6/sampleRate));
}
bool DummyLoad::make(bool wSkipRx)
{
samplesRead = 0;
samplesWritten = 0;
return true;
}
bool DummyLoad::start()
{
LOG(INFO) << "starting USRP...";
underrun = false;
gettimeofday(&startTime,NULL);
dummyBurstCursor = 0;
return true;
}
bool DummyLoad::stop()
{
return true;
}
// NOTE: Assumes sequential reads
int DummyLoad::readSamples(short *buf, int len, bool *overrun,
TIMESTAMP timestamp,
bool *wUnderrun,
unsigned *RSSI)
{
updateTime();
underrunLock.lock();
*wUnderrun = underrun;
underrunLock.unlock();
if (currstamp+len < timestamp) {
usleep(100);
return 0;
}
else if (currstamp < timestamp) {
usleep(100);
return 0;
}
else if (timestamp+len < currstamp) {
memcpy(buf,dummyBurst+dummyBurstCursor*2,sizeof(short)*2*(dummyBurstSz-dummyBurstCursor));
int retVal = dummyBurstSz-dummyBurstCursor;
dummyBurstCursor = 0;
return retVal;
}
else if (timestamp + len > currstamp) {
int amount = timestamp + len - currstamp;
if (amount < dummyBurstSz-dummyBurstCursor) {
memcpy(buf,dummyBurst+dummyBurstCursor*2,sizeof(short)*2*amount);
dummyBurstCursor += amount;
return amount;
}
else {
memcpy(buf,dummyBurst+dummyBurstCursor*2,sizeof(short)*2*(dummyBurstSz-dummyBurstCursor));
int retVal = dummyBurstSz-dummyBurstCursor;
dummyBurstCursor = 0;
return retVal;
}
}
return 0;
}
int DummyLoad::writeSamples(short *buf, int len, bool *wUnderrun,
unsigned long long timestamp,
bool isControl)
{
updateTime();
underrunLock.lock();
underrun |= (currstamp+len < timestamp);
underrunLock.unlock();
return len;
}
bool DummyLoad::updateAlignment(TIMESTAMP timestamp)
{
return true;
}
bool DummyLoad::setTxFreq(double wFreq) { return true;};
bool DummyLoad::setRxFreq(double wFreq) { return true;};
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