mirror of https://github.com/g4klx/MMDVM.git
126 lines
2.8 KiB
C++
126 lines
2.8 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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#include "Globals.h"
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#include "FMCTCSSTX.h"
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const struct CTCSS_TABLE {
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uint8_t frequency;
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uint16_t length;
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q15_t increment;
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} CTCSS_TABLE_DATA[] = {
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{ 67U, 358U, 92},
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{ 69U, 346U, 95},
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{ 71U, 334U, 99},
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{ 74U, 323U, 102},
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{ 77U, 312U, 106},
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{ 79U, 301U, 109},
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{ 82U, 291U, 113},
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{ 85U, 281U, 117},
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{ 88U, 271U, 121},
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{ 91U, 262U, 125},
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{ 94U, 253U, 130},
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{ 97U, 246U, 133},
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{100U, 240U, 137},
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{103U, 232U, 142},
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{107U, 224U, 147},
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{110U, 216U, 152},
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{114U, 209U, 157},
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{118U, 202U, 163},
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{123U, 195U, 168},
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{127U, 189U, 174},
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{131U, 182U, 180},
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{136U, 176U, 187},
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{141U, 170U, 193},
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{146U, 164U, 200},
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{151U, 159U, 207},
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{156U, 153U, 214},
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{159U, 150U, 219},
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{162U, 148U, 222},
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{165U, 145U, 226},
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{167U, 143U, 230},
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{171U, 140U, 234},
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{173U, 138U, 238},
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{177U, 135U, 243},
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{179U, 133U, 246},
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{183U, 131U, 251},
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{186U, 129U, 255},
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{189U, 126U, 260},
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{192U, 124U, 264},
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{196U, 122U, 269},
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{199U, 120U, 273},
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{203U, 118U, 278},
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{206U, 116U, 282},
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{210U, 114U, 288},
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{218U, 110U, 298},
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{225U, 106U, 309},
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{229U, 105U, 313},
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{233U, 103U, 319},
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{241U, 99U, 331},
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{250U, 96U, 342},
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{254U, 94U, 347}
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};
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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 CTCSS_TABLE* entry = NULL;
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for (uint8_t i = 0U; i < CTCSS_TABLE_DATA_LEN; i++) {
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if (CTCSS_TABLE_DATA[i].frequency == frequency) {
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entry = 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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m_values = new q15_t[m_length];
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q15_t arg = 0;
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for (uint16_t i = 0U; i < m_length; i++) {
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q31_t value = ::arm_sin_q15(arg) * q15_t(level * 13);
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m_values[i] = q15_t(__SSAT((value >> 15), 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()
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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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return sample;
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}
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