mirror of https://github.com/g4klx/MMDVM.git
135 lines
3.1 KiB
C++
135 lines
3.1 KiB
C++
/*
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* Copyright (C) 2020 by Jonathan Naylor G4KLX
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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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#include "Config.h"
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#if defined(MODE_FM)
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#include "Globals.h"
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#include "FMCTCSSTX.h"
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const struct TX_CTCSS_TABLE {
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uint8_t frequency;
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uint16_t length;
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q31_t increment;
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} TX_CTCSS_TABLE_DATA[] = {
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{ 67U, 358U, 5995059},
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{ 69U, 346U, 6200860},
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{ 71U, 334U, 6433504},
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{ 74U, 323U, 6657200},
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{ 77U, 312U, 6889844},
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{ 79U, 301U, 7131436},
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{ 82U, 291U, 7381976},
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{ 85U, 281U, 7641463},
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{ 88U, 271U, 7918846},
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{ 91U, 262U, 8187282},
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{ 94U, 253U, 8482561},
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{ 97U, 246U, 8715205},
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{100U, 240U, 8947849},
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{103U, 232U, 9261024},
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{107U, 224U, 9592094},
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{110U, 216U, 9923165},
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{114U, 209U, 10272131},
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{118U, 202U, 10630045},
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{123U, 195U, 11005854},
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{127U, 189U, 11390612},
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{131U, 182U, 11793265},
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{136U, 176U, 12213814},
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{141U, 170U, 12643310},
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{146U, 164U, 13081755},
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{151U, 159U, 13547043},
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{156U, 153U, 14021279},
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{159U, 150U, 14298662},
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{162U, 148U, 14513411},
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{165U, 145U, 14808690},
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{167U, 143U, 15023438},
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{171U, 140U, 15327665},
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{173U, 138U, 15551361},
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{177U, 135U, 15864536},
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{179U, 133U, 16097180},
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{183U, 131U, 16419303},
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{186U, 129U, 16660894},
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{189U, 126U, 16991965},
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{192U, 124U, 17251452},
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{196U, 122U, 17591471},
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{199U, 120U, 17850958},
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{203U, 118U, 18208872},
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{206U, 116U, 18477308},
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{210U, 114U, 18853117},
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{218U, 110U, 19515258},
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{225U, 106U, 20195295},
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{229U, 105U, 20499521},
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{233U, 103U, 20902175},
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{241U, 99U, 21635898},
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{250U, 96U, 22396465},
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{254U, 94U, 22736484}};
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const uint8_t CTCSS_TABLE_DATA_LEN = 50U;
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CFMCTCSSTX::CFMCTCSSTX() :
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m_values(NULL),
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m_length(0U),
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m_n(0U)
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{
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}
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uint8_t CFMCTCSSTX::setParams(uint8_t frequency, uint8_t level)
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{
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const TX_CTCSS_TABLE* entry = NULL;
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for (uint8_t i = 0U; i < CTCSS_TABLE_DATA_LEN; i++) {
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if (TX_CTCSS_TABLE_DATA[i].frequency == frequency) {
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entry = TX_CTCSS_TABLE_DATA + i;
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break;
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}
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}
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if (entry == NULL)
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return 4U;
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m_length = entry->length;
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delete[] m_values;
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m_values = new q15_t[m_length];
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q31_t arg = 0;
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for (uint16_t i = 0U; i < m_length; i++) {
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q63_t value = ::arm_sin_q31(arg) * q63_t(level * 13);
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m_values[i] = q15_t(__SSAT((value >> 31), 16));
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arg += entry->increment;
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}
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return 0U;
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}
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q15_t CFMCTCSSTX::getAudio(bool reverse)
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{
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q15_t sample = m_values[m_n++];
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if (m_n >= m_length)
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m_n = 0U;
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if (reverse)
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return -sample;
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else
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return sample;
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}
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#endif
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