mirror of
https://github.com/dj0abr/SSB_HighSpeed_Modem.git
synced 2024-11-25 13:48:47 -05:00
112 lines
3.0 KiB
C++
Executable File
112 lines
3.0 KiB
C++
Executable File
/*
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* High Speed modem to transfer data in a 2,7kHz SSB channel
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* =========================================================
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* Author: DJ0ABR
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*
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* (c) DJ0ABR
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* www.dj0abr.de
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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 2 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* tuning.c ... generate tuning tones and feed audio to TRX
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*
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*/
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#include "hsmodem.h"
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#define NUMFREQ 15
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int tunefreq[NUMFREQ] = { 100,300,500,700,900,1100,1300,1500,1700,1900,2100,2300,2500,2700,2900 };
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nco_crcf tunenco[NUMFREQ];
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uint32_t tuning_runtime = 0;
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void init_tune()
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{
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static int f = 1;
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if (f)
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{
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for (int i = 0; i < NUMFREQ; i++)
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tunenco[i] = NULL;
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f = 0;
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}
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printf("init tune tones to samprate: %d\n", caprate);
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for (int i = 0; i < NUMFREQ; i++)
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{
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if (tunenco[i] != NULL) nco_crcf_destroy(tunenco[i]);
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// create NCO for frequency
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float rad_per_sample = ((2.0f * (float)M_PI * (float)tunefreq[i]) / (float)caprate);
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tunenco[i] = nco_crcf_create(LIQUID_NCO);
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nco_crcf_set_phase(tunenco[i], 0.0f);
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nco_crcf_set_frequency(tunenco[i], rad_per_sample);
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}
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}
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// send= 1 ... send all frequencies to soundcard
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// send= 2,3,4 ... send a single freq to soundcard
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float do_tuning(int send)
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{
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if (send < 0 || send >= NUMFREQ) return 0.0f;
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float f = 0;
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if (send == 1)
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{
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for (int i = 0; i < NUMFREQ; i++)
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{
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nco_crcf_step(tunenco[i]);
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float v = nco_crcf_sin(tunenco[i]);
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f += v;
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}
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f /= 3;
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}
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else
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{
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nco_crcf_step(tunenco[send]);
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f = nco_crcf_sin(tunenco[send]);
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}
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// adapt speed to soundcard samplerate
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int fs;
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while (keeprunning)
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{
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fs = io_fifo_usedspace(io_pbidx);
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// wait until there is space in fifo
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if (fs < 48000) break;
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if (tuning == 0) return 0.0f;
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sleep_ms(10);
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}
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f *= 0.05f;
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kmaudio_playsamples(io_pbidx, &f, 1, pbvol);
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if (++tuning_runtime >= (48000 * 5 * 60))
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{
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// 5min max time
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printf("Maximum tuning time, switch off tuning\n");
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tuning = 0;
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}
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return f;
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}
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float singleFrequency()
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{
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int i = 0; // 100 Hz
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if (tunenco[i] == NULL) return 0.0f;
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nco_crcf_step(tunenco[i]);
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float f = nco_crcf_sin(tunenco[i]);
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return f;
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}
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