mirror of
https://github.com/RangeNetworks/openbts.git
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c7e3d8133e
Move push and pull of buffers into a dedicated file. This will allow us to swap out resampling, non-resampling, and possibly floating point device interfaces while presenting a single floating point abstration in the interface itself. Signed-off-by: Thomas Tsou <ttsou@vt.edu> git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2670 19bc5d8c-e614-43d4-8b26-e1612bc8e597
92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
/*
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* Radio device I/O interface
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* Written by Thomas Tsou <ttsou@vt.edu>
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*
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* Copyright 2011 Free Software Foundation, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* See the COPYING file in the main directory for details.
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*/
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#include <radioInterface.h>
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#include <Logger.h>
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/* Device side buffers */
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static short rx_buf[OUTCHUNK * 2 * 2];
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static short tx_buf[INCHUNK * 2 * 2];
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/* Complex float to short conversion */
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static int float_to_short(short *shrt_out, float *flt_in, int num)
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{
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int i;
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for (i = 0; i < num; i++) {
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shrt_out[2 * i + 0] = flt_in[2 * i + 0];
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shrt_out[2 * i + 1] = flt_in[2 * i + 1];
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}
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return i;
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}
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/* Comlpex short to float conversion */
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static int short_to_float(float *flt_out, short *shrt_in, int num)
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{
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int i;
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for (i = 0; i < num; i++) {
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flt_out[2 * i + 0] = shrt_in[2 * i + 0];
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flt_out[2 * i + 1] = shrt_in[2 * i + 1];
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}
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return i;
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}
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/* Receive a timestamped chunk from the device */
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void RadioInterface::pullBuffer()
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{
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bool local_underrun;
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/* Read samples. Fail if we don't get what we want. */
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int num_rd = mRadio->readSamples(rx_buf, OUTCHUNK, &overrun,
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readTimestamp, &local_underrun);
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LOG(DEBUG) << "Rx read " << num_rd << " samples from device";
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assert(num_rd == OUTCHUNK);
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underrun |= local_underrun;
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readTimestamp += (TIMESTAMP) num_rd;
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short_to_float(rcvBuffer + 2 * rcvCursor, rx_buf, num_rd);
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rcvCursor += num_rd;
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}
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/* Send timestamped chunk to the device with arbitrary size */
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void RadioInterface::pushBuffer()
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{
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if (sendCursor < INCHUNK)
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return;
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float_to_short(tx_buf, sendBuffer, sendCursor);
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/* Write samples. Fail if we don't get what we want. */
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int num_smpls = mRadio->writeSamples(tx_buf,
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sendCursor,
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&underrun,
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writeTimestamp);
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assert(num_smpls == sendCursor);
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writeTimestamp += (TIMESTAMP) num_smpls;
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sendCursor = 0;
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}
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