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FMTimeout.cpp
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FMTimeout.cpp
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/*
* 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"
#if defined(MODE_FM)
#include "Globals.h"
#include "FMTimeout.h"
// 400 Hz sine wave at 24000 Hz sample rate
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,
21926, 19261, 16384, 13328, 10126, 6813, 3425, 0, -3425, -6813, -10126, -13328, -16384, -19261, -21926, -24351, -26510, -28378, -29935, -31164, -32052,
-32588, -32768, -32588, -32052, -31164, -29935, -28378, -26510, -24351, -21926, -19261, -16384, -13328, -10126, -6813, -3425};
const uint8_t BUSY_AUDIO_LEN = 60U;
CFMTimeout::CFMTimeout() :
m_level(128 * 128),
m_running(false),
m_pos(0U),
m_n(0U)
{
}
void CFMTimeout::setParams(uint8_t level)
{
m_level = q15_t(level * 5);
}
q15_t CFMTimeout::getAudio()
{
q15_t sample = 0;
if (!m_running)
return sample;
if (m_pos >= 12000U) {
q31_t sample31 = BUSY_AUDIO[m_n] * m_level;
sample = q15_t(__SSAT((sample31 >> 15), 16));
m_n++;
if (m_n >= BUSY_AUDIO_LEN)
m_n = 0U;
}
m_pos++;
if (m_pos >= 24000U)
m_pos = 0U;
return sample;
}
void CFMTimeout::start()
{
m_running = true;
m_pos = 0U;
m_n = 0U;
}
void CFMTimeout::stop()
{
m_running = false;
}
#endif