/**
 * @file
 * @ingroup Audio
 * @brief I2S Driver
 *
 * This uses the SPI hardware and DMA to pull I2S words (one channel only)
 * into a circular buffer.
 *
 *  @date   2018-04-21
 *  @author Chris Pflieger
 */

#ifndef I2S_H_
#define I2S_H_

#include "stdinc.h"
#include "cic_filter.h"


//! In words, keep as a power of two (I think).
#define I2S_BUFFER_SIZE         (64U)






//! 640000 is the slowest this will go.
#define PDM_BITRATE             (CIC_DECIMATION_RATIO * AUDIO_SAMPLE_RATE_HERTZ)


/**
 *  Start the non-stop I2S process.
 *
 */
void i2s_init(void);



#endif /* I2S_H_ */