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Copy pathAudioInI2S.cpp
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113 lines (86 loc) · 2.09 KB
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/*
Copyright (c) 2016 Arduino LLC. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <I2S.h>
#include "AudioInI2S.h"
AudioInI2SClass::AudioInI2SClass() :
_sampleRate(-1),
_bitsPerSample(-1),
_callbackTriggered(true)
{
}
AudioInI2SClass::~AudioInI2SClass()
{
}
int AudioInI2SClass::begin(long sampleRate, int bitsPerSample)
{
if (!I2S.begin(I2S_PHILIPS_MODE, sampleRate, bitsPerSample)) {
return 0;
}
_sampleRate = sampleRate;
_bitsPerSample = bitsPerSample;
// add the receiver callback
I2S.onReceive(AudioInI2SClass::onI2SReceive);
// trigger a read to kick things off
I2S.read();
return 1;
}
void AudioInI2SClass::end()
{
_sampleRate = -1;
_bitsPerSample = -1;
_callbackTriggered = true;
I2S.end();
}
long AudioInI2SClass::sampleRate()
{
return _sampleRate;
}
int AudioInI2SClass::bitsPerSample()
{
return _bitsPerSample;
}
int AudioInI2SClass::channels()
{
return 2;
}
int AudioInI2SClass::begin()
{
_callbackTriggered = false;
return 0;
}
int AudioInI2SClass::read(void* buffer, size_t size)
{
int read = I2S.read(buffer, size);
if (read) {
samplesRead(buffer, read);
}
return read;
}
int AudioInI2SClass::reset()
{
return 0;
}
void AudioInI2SClass::onReceive()
{
if (_callbackTriggered) {
uint8_t data[512];
read(data, sizeof(data));
}
}
void AudioInI2SClass::onI2SReceive()
{
AudioInI2S.onReceive();
}
AudioInI2SClass AudioInI2S;