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/* UHD device access
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*
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* (C) 2017 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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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 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <math.h>
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#include <uhd.h>
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#include <uhd/usrp/usrp.h>
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#include "uhd.h"
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#include "debug.h"
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static uhd_usrp_handle usrp = NULL;
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static uhd_tx_streamer_handle tx_streamer = NULL;
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static uhd_rx_streamer_handle rx_streamer = NULL;
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static uhd_tx_metadata_handle tx_metadata = NULL;
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static uhd_rx_metadata_handle rx_metadata = NULL;
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static uhd_tune_request_t tune_request;
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static uhd_tune_result_t tune_result;
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static uhd_stream_args_t stream_args;
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static uhd_stream_cmd_t stream_cmd;
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static size_t tx_samps_per_buff, rx_samps_per_buff;
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static double samplerate;
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static int check_rate; /* flag to check sample rate matches time stamp increment */
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static time_t rx_time_secs = 0;
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static double rx_time_fract_sec = 0.0;
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static time_t tx_time_secs = 0;
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static double tx_time_fract_sec = 0.0;
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int uhd_open(const char *device_args, double tx_frequency, double rx_frequency, double rate, double rx_gain, double tx_gain)
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{
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uhd_error error;
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double got_frequency, got_rate, got_gain;
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size_t channel = 0;
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samplerate = rate;
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check_rate = 1;
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#warning HACK
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if (tx_frequency < 200000000) tx_frequency = 463000000, rx_frequency = 463000000;
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/* create USRP */
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PDEBUG(DUHD, DEBUG_INFO, "Creating USRP with args \"%s\"...\n", device_args);
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error = uhd_usrp_make(&usrp, device_args);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to create USRP\n");
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uhd_close();
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return -EIO;
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}
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/* create streamers */
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error = uhd_tx_streamer_make(&tx_streamer);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to create TX streamer\n");
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uhd_close();
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return -EIO;
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}
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error = uhd_rx_streamer_make(&rx_streamer);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to create RX streamer\n");
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uhd_close();
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return -EIO;
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}
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/* create rx metadata */
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error = uhd_rx_metadata_make(&rx_metadata);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to create RX metadata\n");
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uhd_close();
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return -EIO;
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}
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/* set rate */
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error = uhd_usrp_set_tx_rate(usrp, rate, channel);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to set TX rate to %.0f Hz\n", rate);
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uhd_close();
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return -EIO;
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}
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error = uhd_usrp_set_rx_rate(usrp, rate, channel);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to set RX rate to %.0f Hz\n", rate);
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uhd_close();
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return -EIO;
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}
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/* see what rate actually is */
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error = uhd_usrp_get_tx_rate(usrp, channel, &got_rate);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to get TX rate\n");
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uhd_close();
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return -EIO;
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}
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if (got_rate != rate) {
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PDEBUG(DUHD, DEBUG_ERROR, "Given TX rate %.0f Hz is not supported, try %0.f Hz\n", rate, got_rate);
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uhd_close();
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return -EINVAL;
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}
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error = uhd_usrp_get_rx_rate(usrp, channel, &got_rate);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to get RX rate\n");
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uhd_close();
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return -EIO;
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}
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if (got_rate != rate) {
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PDEBUG(DUHD, DEBUG_ERROR, "Given RX rate %.0f Hz is not supported, try %0.f Hz\n", rate, got_rate);
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uhd_close();
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return -EINVAL;
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}
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/* set gain */
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error = uhd_usrp_set_tx_gain(usrp, tx_gain, channel, "");
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to set TX gain to %.0f\n", tx_gain);
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uhd_close();
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return -EIO;
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}
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error = uhd_usrp_set_rx_gain(usrp, rx_gain, channel, "");
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to set RX gain to %.0f\n", rx_gain);
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uhd_close();
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return -EIO;
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}
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/* see what gain actually is */
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error = uhd_usrp_get_tx_gain(usrp, channel, "", &got_gain);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to get TX gain\n");
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uhd_close();
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return -EIO;
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}
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if (got_gain != tx_gain) {
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PDEBUG(DUHD, DEBUG_NOTICE, "Given TX gain %.0f is not supported, we use %0.f\n", tx_gain, got_gain);
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tx_gain = got_gain;
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}
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error = uhd_usrp_get_rx_gain(usrp, channel, "", &got_gain);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to get RX gain\n");
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uhd_close();
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return -EIO;
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}
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if (got_gain != rx_gain) {
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PDEBUG(DUHD, DEBUG_NOTICE, "Given RX gain %.3f is not supported, we use %.3f\n", rx_gain, got_gain);
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rx_gain = got_gain;
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}
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/* set frequency */
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memset(&tune_request, 0, sizeof(tune_request));
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tune_request.target_freq = tx_frequency;
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tune_request.rf_freq_policy = UHD_TUNE_REQUEST_POLICY_AUTO;
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tune_request.dsp_freq_policy = UHD_TUNE_REQUEST_POLICY_AUTO;
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error = uhd_usrp_set_tx_freq(usrp, &tune_request, channel, &tune_result);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to set TX rate to %.0f Hz\n", tx_frequency);
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uhd_close();
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return -EIO;
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}
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tune_request.target_freq = rx_frequency;
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error = uhd_usrp_set_rx_freq(usrp, &tune_request, channel, &tune_result);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to set RX rate to %.0f Hz\n", rx_frequency);
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uhd_close();
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return -EIO;
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}
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/* see what frequency actually is */
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error = uhd_usrp_get_tx_freq(usrp, channel, &got_frequency);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to get TX frequency\n");
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uhd_close();
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return -EIO;
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}
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if (got_frequency != tx_frequency) {
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PDEBUG(DUHD, DEBUG_ERROR, "Given TX frequency %.0f Hz is not supported, try %0.f Hz\n", tx_frequency, got_frequency);
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uhd_close();
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return -EINVAL;
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}
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error = uhd_usrp_get_rx_freq(usrp, channel, &got_frequency);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to get RX frequency\n");
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uhd_close();
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return -EIO;
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}
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if (got_frequency != rx_frequency) {
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PDEBUG(DUHD, DEBUG_ERROR, "Given RX frequency %.0f Hz is not supported, try %0.f Hz\n", rx_frequency, got_frequency);
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uhd_close();
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return -EINVAL;
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}
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/* set up streamer */
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memset(&stream_args, 0, sizeof(stream_args));
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stream_args.cpu_format = "fc32";
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stream_args.otw_format = "sc16";
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stream_args.args = "";
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stream_args.channel_list = &channel;
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stream_args.n_channels = 1;
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error = uhd_usrp_get_tx_stream(usrp, &stream_args, tx_streamer);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to set TX streamer args\n");
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uhd_close();
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return -EIO;
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}
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error = uhd_usrp_get_rx_stream(usrp, &stream_args, rx_streamer);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to set RX streamer args\n");
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uhd_close();
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return -EIO;
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}
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/* get buffer sizes */
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error = uhd_tx_streamer_max_num_samps(tx_streamer, &tx_samps_per_buff);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to get TX streamer sample buffer\n");
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uhd_close();
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return -EIO;
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}
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error = uhd_rx_streamer_max_num_samps(rx_streamer, &rx_samps_per_buff);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to get RX streamer sample buffer\n");
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uhd_close();
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return -EIO;
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}
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/* enable rx stream */
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memset(&stream_cmd, 0, sizeof(stream_cmd));
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stream_cmd.stream_mode = UHD_STREAM_MODE_START_CONTINUOUS;
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stream_cmd.stream_now = true;
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error = uhd_rx_streamer_issue_stream_cmd(rx_streamer, &stream_cmd);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to issue RX stream command\n");
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uhd_close();
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return -EIO;
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}
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return 0;
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}
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void uhd_close(void)
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{
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PDEBUG(DUHD, DEBUG_DEBUG, "Clean up UHD\n");
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if (tx_metadata)
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uhd_tx_metadata_free(&tx_metadata);
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if (rx_metadata)
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uhd_rx_metadata_free(&rx_metadata);
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if (tx_streamer)
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uhd_tx_streamer_free(&tx_streamer);
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if (rx_streamer)
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uhd_rx_streamer_free(&rx_streamer);
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if (usrp)
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uhd_usrp_free(&usrp);
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}
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int uhd_send(float *buff, int num)
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{
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const void *buffs_ptr[1];
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int chunk;
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size_t sent = 0, count;
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uhd_error error;
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while (num) {
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chunk = num;
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if (chunk > (int)tx_samps_per_buff)
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chunk = (int)tx_samps_per_buff;
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/* create tx metadata */
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error = uhd_tx_metadata_make(&tx_metadata, true, tx_time_secs, tx_time_fract_sec, true, false);
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if (error)
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to create TX metadata\n");
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buffs_ptr[0] = buff;
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count = 0;
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error = uhd_tx_streamer_send(tx_streamer, buffs_ptr, chunk, &tx_metadata, 0.0, &count);
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if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to write to TX streamer\n");
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break;
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}
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if (count == 0)
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break;
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/* increment time stamp */
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tx_time_fract_sec += (double)count / samplerate;
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while (tx_time_fract_sec >= 1.0) {
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tx_time_secs++;
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tx_time_fract_sec -= 1.0;
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}
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//printf("adv=%.3f\n", ((double)tx_time_secs + tx_time_fract_sec) - ((double)rx_time_secs + rx_time_fract_sec));
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sent += count;
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buff += count * 2;
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num -= count;
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}
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return sent;
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}
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/* read what we got, return 0, if buffer is empty, otherwise return the number of samples */
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int uhd_receive(float *buff, int max)
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{
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void *buffs_ptr[1];
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size_t got = 0, count;
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uhd_error error;
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time_t last_secs = rx_time_secs;
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double last_fract_sec = rx_time_fract_sec;
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if (max < (int)rx_samps_per_buff) {
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PDEBUG(DUHD, DEBUG_ERROR, "SDR rx buffer too small, please fix!\n");
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return 0;
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}
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while (max >= (int)rx_samps_per_buff) {
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buffs_ptr[0] = buff;
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count = 0;
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error = uhd_rx_streamer_recv(rx_streamer, buffs_ptr, rx_samps_per_buff, &rx_metadata, 0.0, false, &count);
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|
if (error) {
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PDEBUG(DUHD, DEBUG_ERROR, "Failed to read from UHD device.\n");
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|
break;
|
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|
}
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if (count == 0)
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break;
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|
uhd_rx_metadata_time_spec(rx_metadata, &rx_time_secs, &rx_time_fract_sec);
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|
|
/* check sample rate matches time stamp increment */
|
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|
|
if (last_secs || last_fract_sec) {
|
|
|
|
|
double got = ((double)rx_time_secs + rx_time_fract_sec) - ((double)last_secs + last_fract_sec);
|
|
|
|
|
double expect = (double)count / samplerate;
|
|
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|
|
double diff = fabs(got - expect);
|
|
|
|
|
if (diff > 0.000000000001) {
|
|
|
|
|
if (check_rate) {
|
|
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|
|
PDEBUG(DUHD, DEBUG_ERROR, "Received rate (%.0f) does not match defined rate (%.0f), use diffrent sample rate that UHD device can handle!\n", (double)count / got, samplerate);
|
|
|
|
|
return -EPERM;
|
|
|
|
|
}
|
|
|
|
|
int gap = diff * (double)samplerate;
|
|
|
|
|
PDEBUG(DUHD, DEBUG_ERROR, "Detected a gap of %.6f secods (%d samples), \n", diff, gap);
|
|
|
|
|
#warning fill gap
|
|
|
|
|
}
|
|
|
|
|
check_rate = 0;
|
|
|
|
|
}
|
|
|
|
|
// printf("s = %d time = %.12f samples = %.12f\n", count, ((double)rx_time_secs + rx_time_fract_sec) - ((double)last_s + last_f), (double)count / samplerate);
|
|
|
|
|
|
|
|
|
|
got += count;
|
|
|
|
|
buff += count * 2;
|
|
|
|
|
max -= count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return got;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* estimate current unsent number of samples */
|
|
|
|
|
int uhd_get_inbuffer(void)
|
|
|
|
|
{
|
|
|
|
|
double advance;
|
|
|
|
|
|
|
|
|
|
/* we need the rx time stamp to determine how much data is already sent in advance */
|
|
|
|
|
if (rx_time_secs == 0 && rx_time_fract_sec == 0.0)
|
|
|
|
|
return -EAGAIN;
|
|
|
|
|
|
|
|
|
|
/* if we have not yet sent any data, we set initial tx time stamp */
|
|
|
|
|
if (tx_time_secs == 0 && tx_time_fract_sec == 0.0) {
|
|
|
|
|
tx_time_secs = rx_time_secs;
|
|
|
|
|
tx_time_fract_sec = rx_time_fract_sec;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* we check how advance our transmitted time stamp is */
|
|
|
|
|
advance = ((double)tx_time_secs + tx_time_fract_sec) - ((double)rx_time_secs + rx_time_fract_sec);
|
|
|
|
|
/* in case of underrun: */
|
|
|
|
|
if (advance < 0)
|
|
|
|
|
advance = 0;
|
|
|
|
|
|
|
|
|
|
return (int)(advance * samplerate);
|
|
|
|
|
}
|
|
|
|
|
|
Andreas Eversberg