Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Multi-carrier radio interface |
| 3 | * |
Pau Espin Pedrol | 4644463 | 2018-09-03 16:42:04 +0200 | [diff] [blame] | 4 | * Copyright (C) 2016 Ettus Research LLC |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 5 | * |
| 6 | * Author: Tom Tsou <tom.tsou@ettus.com> |
| 7 | * |
Pau Espin Pedrol | 21d03d3 | 2019-07-22 12:05:52 +0200 | [diff] [blame] | 8 | * SPDX-License-Identifier: AGPL-3.0+ |
| 9 | * |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 10 | * This program is free software: you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU Affero General Public License as published by |
| 12 | * the Free Software Foundation, either version 3 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU Affero General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Affero General Public License |
| 21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 22 | * See the COPYING file in the main directory for details. |
| 23 | */ |
| 24 | |
| 25 | #include <radioInterface.h> |
| 26 | #include <Logger.h> |
| 27 | |
| 28 | #include "Resampler.h" |
| 29 | |
| 30 | extern "C" { |
| 31 | #include "convert.h" |
| 32 | } |
| 33 | |
| 34 | /* Resampling parameters for 64 MHz clocking */ |
| 35 | #define RESAMP_INRATE 65 |
| 36 | #define RESAMP_OUTRATE (96 / 2) |
| 37 | |
| 38 | /* Universal resampling parameters */ |
| 39 | #define NUMCHUNKS 24 |
| 40 | |
| 41 | #define MCHANS 4 |
| 42 | |
| 43 | RadioInterfaceMulti::RadioInterfaceMulti(RadioDevice *radio, size_t tx_sps, |
| 44 | size_t rx_sps, size_t chans) |
| 45 | : RadioInterface(radio, tx_sps, rx_sps, chans), |
| 46 | outerSendBuffer(NULL), outerRecvBuffer(NULL), |
| 47 | dnsampler(NULL), upsampler(NULL), channelizer(NULL), synthesis(NULL) |
| 48 | { |
| 49 | } |
| 50 | |
| 51 | RadioInterfaceMulti::~RadioInterfaceMulti() |
| 52 | { |
| 53 | close(); |
| 54 | } |
| 55 | |
| 56 | void RadioInterfaceMulti::close() |
| 57 | { |
| 58 | delete outerSendBuffer; |
| 59 | delete outerRecvBuffer; |
| 60 | delete dnsampler; |
| 61 | delete upsampler; |
| 62 | delete channelizer; |
| 63 | delete synthesis; |
| 64 | |
| 65 | outerSendBuffer = NULL; |
| 66 | outerRecvBuffer = NULL; |
| 67 | dnsampler = NULL; |
| 68 | upsampler = NULL; |
| 69 | channelizer = NULL; |
| 70 | synthesis = NULL; |
| 71 | |
| 72 | mReceiveFIFO.resize(0); |
| 73 | powerScaling.resize(0); |
| 74 | history.resize(0); |
| 75 | active.resize(0); |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 76 | rx_freq_state.resize(0); |
| 77 | tx_freq_state.resize(0); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 78 | |
| 79 | RadioInterface::close(); |
| 80 | } |
| 81 | |
| 82 | static int getLogicalChan(size_t pchan, size_t chans) |
| 83 | { |
| 84 | switch (chans) { |
| 85 | case 1: |
| 86 | if (pchan == 0) |
| 87 | return 0; |
| 88 | else |
| 89 | return -1; |
| 90 | break; |
| 91 | case 2: |
| 92 | if (pchan == 0) |
| 93 | return 0; |
| 94 | if (pchan == 3) |
| 95 | return 1; |
| 96 | else |
| 97 | return -1; |
| 98 | break; |
| 99 | case 3: |
| 100 | if (pchan == 1) |
| 101 | return 0; |
| 102 | if (pchan == 0) |
| 103 | return 1; |
| 104 | if (pchan == 3) |
| 105 | return 2; |
| 106 | else |
| 107 | return -1; |
| 108 | break; |
| 109 | default: |
| 110 | break; |
| 111 | }; |
| 112 | |
| 113 | return -1; |
| 114 | } |
| 115 | |
| 116 | static int getFreqShift(size_t chans) |
| 117 | { |
| 118 | switch (chans) { |
| 119 | case 1: |
| 120 | return 0; |
| 121 | case 2: |
| 122 | return 0; |
| 123 | case 3: |
| 124 | return 1; |
| 125 | default: |
| 126 | break; |
| 127 | }; |
| 128 | |
| 129 | return -1; |
| 130 | } |
| 131 | |
| 132 | /* Initialize I/O specific objects */ |
| 133 | bool RadioInterfaceMulti::init(int type) |
| 134 | { |
| 135 | float cutoff = 1.0f; |
| 136 | size_t inchunk = 0, outchunk = 0; |
| 137 | |
| 138 | if (mChans > MCHANS - 1) { |
| 139 | LOG(ALERT) << "Invalid channel configuration " << mChans; |
| 140 | return false; |
| 141 | } |
| 142 | |
| 143 | close(); |
| 144 | |
| 145 | sendBuffer.resize(mChans); |
| 146 | recvBuffer.resize(mChans); |
| 147 | convertSendBuffer.resize(1); |
| 148 | convertRecvBuffer.resize(1); |
| 149 | |
| 150 | mReceiveFIFO.resize(mChans); |
| 151 | powerScaling.resize(mChans); |
| 152 | history.resize(mChans); |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 153 | rx_freq_state.resize(mChans); |
| 154 | tx_freq_state.resize(mChans); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 155 | active.resize(MCHANS, false); |
| 156 | |
| 157 | inchunk = RESAMP_INRATE * 4; |
| 158 | outchunk = RESAMP_OUTRATE * 4; |
| 159 | |
| 160 | if (inchunk * NUMCHUNKS < 625 * 2) { |
| 161 | LOG(ALERT) << "Invalid inner chunk size " << inchunk; |
| 162 | return false; |
| 163 | } |
| 164 | |
| 165 | dnsampler = new Resampler(RESAMP_INRATE, RESAMP_OUTRATE); |
| 166 | if (!dnsampler->init(1.0)) { |
| 167 | LOG(ALERT) << "Rx resampler failed to initialize"; |
| 168 | return false; |
| 169 | } |
| 170 | |
| 171 | upsampler = new Resampler(RESAMP_OUTRATE, RESAMP_INRATE); |
| 172 | if (!upsampler->init(cutoff)) { |
| 173 | LOG(ALERT) << "Tx resampler failed to initialize"; |
| 174 | return false; |
| 175 | } |
| 176 | |
| 177 | channelizer = new Channelizer(MCHANS, outchunk); |
| 178 | if (!channelizer->init()) { |
| 179 | LOG(ALERT) << "Rx channelizer failed to initialize"; |
| 180 | return false; |
| 181 | } |
| 182 | |
| 183 | synthesis = new Synthesis(MCHANS, outchunk); |
| 184 | if (!synthesis->init()) { |
| 185 | LOG(ALERT) << "Tx synthesis filter failed to initialize"; |
| 186 | return false; |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * Allocate high and low rate buffers. The high rate receive |
| 191 | * buffer and low rate transmit vectors feed into the resampler |
| 192 | * and requires headroom equivalent to the filter length. Low |
| 193 | * rate buffers are allocated in the main radio interface code. |
| 194 | */ |
| 195 | for (size_t i = 0; i < mChans; i++) { |
| 196 | sendBuffer[i] = new RadioBuffer(NUMCHUNKS, inchunk, |
| 197 | upsampler->len(), true); |
| 198 | recvBuffer[i] = new RadioBuffer(NUMCHUNKS, inchunk, |
| 199 | 0, false); |
| 200 | history[i] = new signalVector(dnsampler->len()); |
| 201 | |
| 202 | synthesis->resetBuffer(i); |
| 203 | } |
| 204 | |
| 205 | outerSendBuffer = new signalVector(synthesis->outputLen()); |
| 206 | outerRecvBuffer = new signalVector(channelizer->inputLen()); |
| 207 | |
| 208 | convertSendBuffer[0] = new short[2 * synthesis->outputLen()]; |
| 209 | convertRecvBuffer[0] = new short[2 * channelizer->inputLen()]; |
| 210 | |
| 211 | /* Configure channels */ |
| 212 | switch (mChans) { |
| 213 | case 1: |
| 214 | active[0] = true; |
| 215 | break; |
| 216 | case 2: |
| 217 | active[0] = true; |
| 218 | active[3] = true; |
| 219 | break; |
| 220 | case 3: |
| 221 | active[0] = true; |
| 222 | active[1] = true; |
| 223 | active[3] = true; |
| 224 | break; |
| 225 | default: |
| 226 | LOG(ALERT) << "Unsupported channel combination"; |
| 227 | return false; |
| 228 | } |
| 229 | |
| 230 | return true; |
| 231 | } |
| 232 | |
| 233 | /* Receive a timestamped chunk from the device */ |
Pau Espin Pedrol | 8e498bf | 2018-09-03 16:45:15 +0200 | [diff] [blame] | 234 | int RadioInterfaceMulti::pullBuffer() |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 235 | { |
| 236 | bool local_underrun; |
| 237 | size_t num; |
| 238 | float *buf; |
Pau Espin Pedrol | 1f15152 | 2018-08-30 20:52:22 +0200 | [diff] [blame] | 239 | unsigned int i; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 240 | |
| 241 | if (recvBuffer[0]->getFreeSegments() <= 0) |
Pau Espin Pedrol | 8e498bf | 2018-09-03 16:45:15 +0200 | [diff] [blame] | 242 | return -1; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 243 | |
| 244 | /* Outer buffer access size is fixed */ |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 245 | num = mDevice->readSamples(convertRecvBuffer, |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 246 | outerRecvBuffer->size(), |
| 247 | &overrun, |
| 248 | readTimestamp, |
| 249 | &local_underrun); |
| 250 | if (num != channelizer->inputLen()) { |
| 251 | LOG(ALERT) << "Receive error " << num << ", " << channelizer->inputLen(); |
Pau Espin Pedrol | 8e498bf | 2018-09-03 16:45:15 +0200 | [diff] [blame] | 252 | return -1; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | convert_short_float((float *) outerRecvBuffer->begin(), |
| 256 | convertRecvBuffer[0], 2 * outerRecvBuffer->size()); |
| 257 | |
Pau Espin Pedrol | e503c98 | 2019-09-13 18:56:08 +0200 | [diff] [blame] | 258 | osmo_trx_sync_or_and_fetch(&underrun, local_underrun); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 259 | readTimestamp += num; |
| 260 | |
| 261 | channelizer->rotate((float *) outerRecvBuffer->begin(), |
| 262 | outerRecvBuffer->size()); |
| 263 | |
| 264 | for (size_t pchan = 0; pchan < MCHANS; pchan++) { |
| 265 | if (!active[pchan]) |
| 266 | continue; |
| 267 | |
| 268 | int lchan = getLogicalChan(pchan, mChans); |
| 269 | if (lchan < 0) { |
| 270 | LOG(ALERT) << "Invalid logical channel " << pchan; |
| 271 | continue; |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Update history by writing into the head portion of the |
| 276 | * channelizer output buffer. For this to work, filter length of |
| 277 | * the polyphase channelizer partition filter should be equal to |
| 278 | * or larger than the resampling filter. |
| 279 | */ |
| 280 | buf = channelizer->outputBuffer(pchan); |
| 281 | size_t cLen = channelizer->outputLen(); |
| 282 | size_t hLen = dnsampler->len(); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 283 | |
Pau Espin Pedrol | 1f15152 | 2018-08-30 20:52:22 +0200 | [diff] [blame] | 284 | float *fdst = &buf[2 * -hLen]; |
| 285 | complex *src = history[lchan]->begin(); |
| 286 | for (i = 0; i < hLen; i++) { |
| 287 | fdst[0] = src->real(); |
| 288 | fdst[1] = src->imag(); |
| 289 | src++; |
| 290 | fdst += 2; |
| 291 | } |
| 292 | complex *dst = history[lchan]->begin(); |
| 293 | float *fsrc = &buf[2 * (cLen - hLen)]; |
| 294 | for (i = 0; i < hLen; i++) { |
Timo Jacobus | 18a6151 | 2019-09-05 12:12:16 +0200 | [diff] [blame] | 295 | *dst = complex(fsrc[0], fsrc[1]); |
Pau Espin Pedrol | 1f15152 | 2018-08-30 20:52:22 +0200 | [diff] [blame] | 296 | fsrc += 2; |
| 297 | dst++; |
| 298 | } |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 299 | |
| 300 | float *wr_segment = recvBuffer[lchan]->getWriteSegment(); |
| 301 | |
| 302 | /* Write to the end of the inner receive buffer */ |
| 303 | if (!dnsampler->rotate(channelizer->outputBuffer(pchan), |
| 304 | channelizer->outputLen(), |
| 305 | wr_segment, |
| 306 | recvBuffer[lchan]->getSegmentLen())) { |
| 307 | LOG(ALERT) << "Sample rate upsampling error"; |
| 308 | } |
| 309 | } |
Pau Espin Pedrol | 8e498bf | 2018-09-03 16:45:15 +0200 | [diff] [blame] | 310 | return 0; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | /* Send a timestamped chunk to the device */ |
| 314 | bool RadioInterfaceMulti::pushBuffer() |
| 315 | { |
Pau Espin Pedrol | 25383a3 | 2019-09-13 18:23:47 +0200 | [diff] [blame] | 316 | bool local_underrun; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 317 | if (sendBuffer[0]->getAvailSegments() <= 0) |
| 318 | return false; |
| 319 | |
| 320 | for (size_t pchan = 0; pchan < MCHANS; pchan++) { |
| 321 | if (!active[pchan]) { |
| 322 | synthesis->resetBuffer(pchan); |
| 323 | continue; |
| 324 | } |
| 325 | |
| 326 | int lchan = getLogicalChan(pchan, mChans); |
| 327 | if (lchan < 0) { |
| 328 | LOG(ALERT) << "Invalid logical channel " << pchan; |
| 329 | continue; |
| 330 | } |
| 331 | |
| 332 | if (!upsampler->rotate(sendBuffer[lchan]->getReadSegment(), |
| 333 | sendBuffer[lchan]->getSegmentLen(), |
| 334 | synthesis->inputBuffer(pchan), |
| 335 | synthesis->inputLen())) { |
| 336 | LOG(ALERT) << "Sample rate downsampling error"; |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | synthesis->rotate((float *) outerSendBuffer->begin(), |
| 341 | outerSendBuffer->size()); |
| 342 | |
| 343 | convert_float_short(convertSendBuffer[0], |
| 344 | (float *) outerSendBuffer->begin(), |
| 345 | 1.0 / (float) mChans, 2 * outerSendBuffer->size()); |
| 346 | |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 347 | size_t num = mDevice->writeSamples(convertSendBuffer, |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 348 | outerSendBuffer->size(), |
Pau Espin Pedrol | 25383a3 | 2019-09-13 18:23:47 +0200 | [diff] [blame] | 349 | &local_underrun, |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 350 | writeTimestamp); |
| 351 | if (num != outerSendBuffer->size()) { |
| 352 | LOG(ALERT) << "Transmit error " << num; |
| 353 | } |
| 354 | |
Pau Espin Pedrol | e503c98 | 2019-09-13 18:56:08 +0200 | [diff] [blame] | 355 | osmo_trx_sync_or_and_fetch(&underrun, local_underrun); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 356 | writeTimestamp += num; |
| 357 | |
| 358 | return true; |
| 359 | } |
| 360 | |
| 361 | /* Frequency comparison limit */ |
| 362 | #define FREQ_DELTA_LIMIT 10.0 |
| 363 | |
| 364 | static bool fltcmp(double a, double b) |
| 365 | { |
| 366 | return fabs(a - b) < FREQ_DELTA_LIMIT ? true : false; |
| 367 | } |
| 368 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 369 | bool RadioInterfaceMulti::verify_arfcn_consistency(double freq, size_t chan, bool tx) |
| 370 | { |
| 371 | double freq_i; |
| 372 | std::string str_dir = tx ? "Tx" : "Rx"; |
| 373 | std::vector<struct freq_cfg_state> &v = tx ? tx_freq_state : rx_freq_state; |
| 374 | |
| 375 | for (size_t i = 0; i < mChans; i++) { |
| 376 | if (i == chan) |
| 377 | continue; |
| 378 | if (!v[i].set) |
| 379 | continue; |
| 380 | |
| 381 | freq_i = v[i].freq_hz + (double) ((int)chan - (int)i) * MCBTS_SPACING; |
| 382 | if (!fltcmp(freq, freq_i)) { |
| 383 | LOGCHAN(chan, DMAIN, ERROR) |
| 384 | << "Setting " << str_dir << " frequency " << freq |
| 385 | << " is incompatible: already configured channel " |
| 386 | << i << " uses frequency " << v[i].freq_hz |
| 387 | << " (expected " << freq_i << ")"; |
| 388 | return false; |
| 389 | } |
| 390 | } |
| 391 | v[chan].set = true; |
| 392 | v[chan].freq_hz = freq; |
| 393 | return true; |
| 394 | } |
| 395 | |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 396 | bool RadioInterfaceMulti::tuneTx(double freq, size_t chan) |
| 397 | { |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 398 | double shift; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 399 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 400 | if (chan >= mChans) |
| 401 | return false; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 402 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 403 | if (!verify_arfcn_consistency(freq, chan, true)) |
| 404 | return false; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 405 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 406 | if (chan == 0) { |
| 407 | shift = (double) getFreqShift(mChans); |
| 408 | return mDevice->setTxFreq(freq + shift * MCBTS_SPACING); |
| 409 | } |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 410 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 411 | return true; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | bool RadioInterfaceMulti::tuneRx(double freq, size_t chan) |
| 415 | { |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 416 | double shift; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 417 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 418 | if (chan >= mChans) |
| 419 | return false; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 420 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 421 | if (!verify_arfcn_consistency(freq, chan, false)) |
| 422 | return false; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 423 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 424 | if (chan == 0) { |
| 425 | shift = (double) getFreqShift(mChans); |
| 426 | return mDevice->setRxFreq(freq + shift * MCBTS_SPACING); |
| 427 | } |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 428 | |
Pau Espin Pedrol | fd99c6c | 2019-12-21 00:40:09 +0100 | [diff] [blame] | 429 | return true; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | double RadioInterfaceMulti::setRxGain(double db, size_t chan) |
| 433 | { |
Pau Espin Pedrol | 17e6cd0 | 2019-09-13 16:19:58 +0200 | [diff] [blame] | 434 | if (chan == 0) |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 435 | return mDevice->setRxGain(db); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 436 | else |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 437 | return mDevice->getRxGain(); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 438 | } |
Pau Espin Pedrol | 6284524 | 2019-09-13 17:29:21 +0200 | [diff] [blame] | 439 | |
| 440 | double RadioInterfaceMulti::setTxGain(double dB, size_t chan) |
| 441 | { |
| 442 | if (chan == 0) |
| 443 | return mDevice->setTxGain(dB); |
| 444 | else |
| 445 | return mDevice->getTxGain(); |
| 446 | |
| 447 | } |