MMDVM/FMCTCSSTX.cpp

137 lines
3.0 KiB
C++

/*
* Copyright (C) 2020 by Jonathan Naylor G4KLX
*
* 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.
*/
#include "Config.h"
#include "Globals.h"
#include "FMCTCSSTX.h"
const struct CTCSS_TABLE {
uint8_t frequency;
uint16_t length;
q15_t increment;
} CTCSS_TABLE_DATA[] = {
{ 67U, 358U, 92},
{ 69U, 346U, 95},
{ 71U, 334U, 99},
{ 74U, 323U, 102},
{ 77U, 312U, 106},
{ 79U, 301U, 109},
{ 82U, 291U, 113},
{ 85U, 281U, 117},
{ 88U, 271U, 121},
{ 91U, 262U, 125},
{ 94U, 253U, 130},
{ 97U, 246U, 133},
{100U, 240U, 137},
{103U, 232U, 142},
{107U, 224U, 147},
{110U, 216U, 152},
{114U, 209U, 157},
{118U, 202U, 163},
{123U, 195U, 168},
{127U, 189U, 174},
{131U, 182U, 180},
{136U, 176U, 187},
{141U, 170U, 193},
{146U, 164U, 200},
{151U, 159U, 207},
{156U, 153U, 214},
{159U, 150U, 219},
{162U, 148U, 222},
{165U, 145U, 226},
{167U, 143U, 230},
{171U, 140U, 234},
{173U, 138U, 238},
{177U, 135U, 243},
{179U, 133U, 246},
{183U, 131U, 251},
{186U, 129U, 255},
{189U, 126U, 260},
{192U, 124U, 264},
{196U, 122U, 269},
{199U, 120U, 273},
{203U, 118U, 278},
{206U, 116U, 282},
{210U, 114U, 288},
{218U, 110U, 298},
{225U, 106U, 309},
{229U, 105U, 313},
{233U, 103U, 319},
{241U, 99U, 331},
{250U, 96U, 342},
{254U, 94U, 347}
};
const uint8_t CTCSS_TABLE_DATA_LEN = 50U;
CFMCTCSSTX::CFMCTCSSTX() :
m_values(NULL),
m_length(0U),
m_n(0U)
{
}
uint8_t CFMCTCSSTX::setParams(uint8_t frequency, uint8_t level)
{
const CTCSS_TABLE* entry = NULL;
for (uint8_t i = 0U; i < CTCSS_TABLE_DATA_LEN; i++) {
if (CTCSS_TABLE_DATA[i].frequency == frequency) {
entry = CTCSS_TABLE_DATA + i;
break;
}
}
if (entry == NULL)
return 4U;
m_length = entry->length;
m_values = new q15_t[m_length];
q15_t arg = 0;
for (uint16_t i = 0U; i < m_length; i++) {
q31_t value = ::arm_sin_q15(arg) * q15_t(level * 128);
m_values[i] = q15_t(__SSAT((value >> 15), 16));
arg += entry->increment;
}
return 0U;
}
void CFMCTCSSTX::getAudio(q15_t* samples, uint8_t length)
{
for (uint8_t i = 0U; i < length; i++) {
samples[i] += m_values[m_n];
m_n++;
if (m_n >= m_length)
m_n = 0U;
}
}
q15_t CFMCTCSSTX::getAudio(q15_t sample)
{
sample += m_values[m_n++];
if(m_n >= m_length)
m_n = 0U;
return sample;
}