| /* |
| * 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; |
| } |