mirror of https://github.com/g4klx/MMDVM.git
81 lines
2.1 KiB
C++
81 lines
2.1 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 "FMTimeout.h"
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// 400 Hz sine wave at 24000 Hz sample rate
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const q15_t BUSY_AUDIO[] = {0, 3426, 6813, 10126, 13328, 16384, 19261, 21926, 24351, 26510, 28378, 29935, 31164, 32052, 32588, 32767, 32588, 32052, 31164, 29935, 28378, 26510, 24351,
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21926, 19261, 16384, 13328, 10126, 6813, 3425, 0, -3425, -6813, -10126, -13328, -16384, -19261, -21926, -24351, -26510, -28378, -29935, -31164, -32052,
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-32588, -32768, -32588, -32052, -31164, -29935, -28378, -26510, -24351, -21926, -19261, -16384, -13328, -10126, -6813, -3425};
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const uint8_t BUSY_AUDIO_LEN = 60U;
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CFMTimeout::CFMTimeout() :
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m_level(128 * 128),
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m_running(false),
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m_pos(0U),
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m_n(0U)
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{
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}
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void CFMTimeout::setParams(uint8_t level)
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{
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m_level = q15_t(level * 5);
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}
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q15_t CFMTimeout::getAudio()
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{
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q15_t sample = 0;
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if (!m_running)
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return sample;
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if (m_pos >= 12000U) {
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q31_t sample31 = BUSY_AUDIO[m_n] * m_level;
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sample = q15_t(__SSAT((sample31 >> 15), 16));
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m_n++;
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if (m_n >= BUSY_AUDIO_LEN)
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m_n = 0U;
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}
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m_pos++;
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if (m_pos >= 24000U)
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m_pos = 0U;
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return sample;
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}
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void CFMTimeout::start()
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{
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m_running = true;
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m_pos = 0U;
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m_n = 0U;
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}
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void CFMTimeout::stop()
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{
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m_running = false;
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}
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#endif
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