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/*
* Radio device I/O interface
* Written by Thomas Tsou <ttsou@vt.edu>
*
* Copyright 2011 Free Software Foundation, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* See the COPYING file in the main directory for details.
*/
#include <radioInterface.h>
#include <Logger.h>
/* Device side buffers */
static short rx_buf[OUTCHUNK * 2 * 2];
static short tx_buf[INCHUNK * 2 * 2];
/* Complex float to short conversion */
static int float_to_short(short *shrt_out, float *flt_in, int num)
{
int i;
for (i = 0; i < num; i++) {
shrt_out[2 * i + 0] = flt_in[2 * i + 0];
shrt_out[2 * i + 1] = flt_in[2 * i + 1];
}
return i;
}
/* Comlpex short to float conversion */
static int short_to_float(float *flt_out, short *shrt_in, int num)
{
int i;
for (i = 0; i < num; i++) {
flt_out[2 * i + 0] = shrt_in[2 * i + 0];
flt_out[2 * i + 1] = shrt_in[2 * i + 1];
}
return i;
}
/* Receive a timestamped chunk from the device */
void RadioInterface::pullBuffer()
{
bool local_underrun;
/* Read samples. Fail if we don't get what we want. */
int num_rd = mRadio->readSamples(rx_buf, OUTCHUNK, &overrun,
readTimestamp, &local_underrun);
LOG(DEBUG) << "Rx read " << num_rd << " samples from device";
assert(num_rd == OUTCHUNK);
underrun |= local_underrun;
readTimestamp += (TIMESTAMP) num_rd;
short_to_float(rcvBuffer + 2 * rcvCursor, rx_buf, num_rd);
rcvCursor += num_rd;
}
/* Send timestamped chunk to the device with arbitrary size */
void RadioInterface::pushBuffer()
{
if (sendCursor < INCHUNK)
return;
float_to_short(tx_buf, sendBuffer, sendCursor);
/* Write samples. Fail if we don't get what we want. */
int num_smpls = mRadio->writeSamples(tx_buf,
sendCursor,
&underrun,
writeTimestamp);
assert(num_smpls == sendCursor);
writeTimestamp += (TIMESTAMP) num_smpls;
sendCursor = 0;
}
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