AudioOutputCC3200I2S.h

/*
  AudioOutputCC3200I2S
  Base class for an I2S output port
  
  Copyright (C) 2017  Earle F. Philhower, III

  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 3 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, see <http://www.gnu.org/licenses/>.
*/

#ifndef _AUDIOOUTPUTCC3200I2S_H
#define _AUDIOOUTPUTCC3200I2S_H

#include <AudioOutput.h>

#include "BoxAudioBufferTriple.h"
#include <driverlib/i2s.h>
#include <driverlib/prcm.h>
#include <driverlib/rom_map.h>

class AudioOutputCC3200I2S : public AudioOutput
{
  public:
    AudioOutputCC3200I2S(BoxAudioBufferTriple* audioBuffer);
    virtual ~AudioOutputCC3200I2S() override;
    virtual bool SetRate(int hz) override;
    virtual bool SetBitsPerSample(int bits) override;
    virtual bool SetChannels(int channels) override;
    virtual bool ConsumeSample(int16_t sample[2]) override;
    virtual void flush() override;
    virtual bool stop() override;
    virtual bool begin() override;
    
    bool SetOutputModeMono(bool mono);  // Force mono output no matter the input

    int GetRate();

    bool resample;
    uint32_t resampleMaxRate;

  protected:
    virtual int AdjustI2SRate(int hz) { return hz; }
    uint8_t portNo;
    int output_mode;
    bool mono;
    bool i2sOn;
    int dma_buf_count;
    // We can restore the old values and free up these pins when in NoDAC mode
    uint32_t orig_bck;
    uint32_t orig_ws;

    BoxAudioBufferTriple* audioBuffer;

    bool writeEmptyBuffer();

    uint8_t resampleRate = 1;
};

#endif