112 lines
3.0 KiB
C++
Executable File
112 lines
3.0 KiB
C++
Executable File
/*
|
|
* High Speed modem to transfer data in a 2,7kHz SSB channel
|
|
* =========================================================
|
|
* Author: DJ0ABR
|
|
*
|
|
* (c) DJ0ABR
|
|
* www.dj0abr.de
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* tuning.c ... generate tuning tones and feed audio to TRX
|
|
*
|
|
*/
|
|
|
|
#include "hsmodem.h"
|
|
|
|
#define NUMFREQ 15
|
|
int tunefreq[NUMFREQ] = { 100,300,500,700,900,1100,1300,1500,1700,1900,2100,2300,2500,2700,2900 };
|
|
nco_crcf tunenco[NUMFREQ];
|
|
uint32_t tuning_runtime = 0;
|
|
|
|
void init_tune()
|
|
{
|
|
static int f = 1;
|
|
if (f)
|
|
{
|
|
for (int i = 0; i < NUMFREQ; i++)
|
|
tunenco[i] = NULL;
|
|
f = 0;
|
|
}
|
|
|
|
printf("init tune tones to samprate: %d\n", caprate);
|
|
for (int i = 0; i < NUMFREQ; i++)
|
|
{
|
|
if (tunenco[i] != NULL) nco_crcf_destroy(tunenco[i]);
|
|
|
|
// create NCO for frequency
|
|
float rad_per_sample = ((2.0f * (float)M_PI * (float)tunefreq[i]) / (float)caprate);
|
|
tunenco[i] = nco_crcf_create(LIQUID_NCO);
|
|
nco_crcf_set_phase(tunenco[i], 0.0f);
|
|
nco_crcf_set_frequency(tunenco[i], rad_per_sample);
|
|
}
|
|
}
|
|
|
|
// send= 1 ... send all frequencies to soundcard
|
|
// send= 2,3,4 ... send a single freq to soundcard
|
|
float do_tuning(int send)
|
|
{
|
|
if (send < 0 || send >= NUMFREQ) return 0.0f;
|
|
|
|
float f = 0;
|
|
if (send == 1)
|
|
{
|
|
for (int i = 0; i < NUMFREQ; i++)
|
|
{
|
|
nco_crcf_step(tunenco[i]);
|
|
float v = nco_crcf_sin(tunenco[i]);
|
|
f += v;
|
|
}
|
|
f /= 3;
|
|
}
|
|
else
|
|
{
|
|
nco_crcf_step(tunenco[send]);
|
|
f = nco_crcf_sin(tunenco[send]);
|
|
}
|
|
|
|
// adapt speed to soundcard samplerate
|
|
int fs;
|
|
while (keeprunning)
|
|
{
|
|
fs = io_fifo_usedspace(io_pbidx);
|
|
// wait until there is space in fifo
|
|
if (fs < 48000) break;
|
|
if (tuning == 0) return 0.0f;
|
|
sleep_ms(10);
|
|
}
|
|
|
|
f *= 0.05f;
|
|
kmaudio_playsamples(io_pbidx, &f, 1, pbvol);
|
|
|
|
if (++tuning_runtime >= (48000 * 5 * 60))
|
|
{
|
|
// 5min max time
|
|
printf("Maximum tuning time, switch off tuning\n");
|
|
tuning = 0;
|
|
}
|
|
return f;
|
|
}
|
|
|
|
float singleFrequency()
|
|
{
|
|
int i = 0; // 100 Hz
|
|
if (tunenco[i] == NULL) return 0.0f;
|
|
nco_crcf_step(tunenco[i]);
|
|
float f = nco_crcf_sin(tunenco[i]);
|
|
|
|
return f;
|
|
}
|