107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
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/*
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* Adalm Pluto Driver
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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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* =========================
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* SSB Transmitter
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* =========================
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*
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*/
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/*
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* reads len samples from device id into psamp
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* returns: number of values written to psamp , -1=error
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* id ... device id returned by kmaudio_startCapture
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* psamp ... float array of length len getting the audio data (mono)
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* len ... number of float values to write into psamp
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* volume ... 0.0f..2.0f will be multiplied with the input sample
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* wait ... 1=wait for data, 0=return if not enough data available (in this case psamp will return 0,0,0...)
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*
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* if resampling is required the number of returned samples may differ from the number of requested samples
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* it can be larger, so the buffer psamp should be larger than "len" by factor 1.1
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*/
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int kmaudio_readsamples(int id, float* psamp, int len, float volume, int wait);
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#include "qo100trx.h"
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int TXoffsetfreq = 280000;
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void* tx_threadfunction(void* param);
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float sinus[4800];
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void init_tx()
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{
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pthread_t txthread;
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pthread_create(&txthread, NULL, tx_threadfunction, NULL);
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#ifdef SINUSTEST
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for(int i=0; i<4800; i++)
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{
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sinus[i] = (float)sin((double)(i%24)*2.0*M_PI/4800.0);
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sinus[i] *= 10;
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}
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#endif
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}
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void* tx_threadfunction(void* param)
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{
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pthread_detach(pthread_self());
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printf("entering TX loop, *** PID:%ld ***\n",syscall(SYS_gettid));
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while(keeprunning)
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{
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float f[4800];
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if(capidx != -1)
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{
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int ret = kmaudio_readsamples(capidx, f, 4800, 1.0f, 0);
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if(ret)
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{
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if(audioloop)
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{
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// send back to sound output
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if(pbidx != -1)
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kmaudio_playsamples(pbidx,f,ret,1.0f);
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}
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else
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{
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#ifdef SINUSTEST
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memcpy(f,sinus,sizeof(float)*4800);
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#endif
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// send to modulator
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if(ptt)
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{
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upmix(f,ret,TXoffsetfreq);
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}
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}
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}
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else
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usleep(1000);
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}
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else
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usleep(1000);
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}
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printf("exit TX loop\n");
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pthread_exit(NULL); // self terminate this thread
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return NULL;
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}
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