audio_i2s.h

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/*
 *  Copyright (c) 2021, PACKETCRAFT, INC.
 *
 *  SPDX-License-Identifier: LicenseRef-PCFT
 */
 
#ifndef _AUDIO_I2S_H_
#define _AUDIO_I2S_H_
 
#include <zephyr/kernel.h>
#include <stdint.h>
 
/*
 * Calculate the number of bytes of one frame, as per now, this frame can either
 * be 10 or 7.5 ms. Since we can't have floats in a define we use 15/2 instead
 */
 
#define HFCLKAUDIO_12_288_MHZ 0x9BA6
#define HFCLKAUDIO_12_165_MHZ 0x8FD8
#define HFCLKAUDIO_12_411_MHZ 0xA774
 
#if ((CONFIG_AUDIO_FRAME_DURATION_US == 7500) && CONFIG_SW_CODEC_LC3)
 
#define FRAME_SIZE_BYTES                                                                           \
        ((CONFIG_I2S_LRCK_FREQ_HZ / 1000 * 15 / 2) * CONFIG_I2S_CH_NUM *                           \
         CONFIG_AUDIO_BIT_DEPTH_OCTETS)
#else
#define FRAME_SIZE_BYTES                                                                           \
        ((CONFIG_I2S_LRCK_FREQ_HZ / 1000 * 10) * CONFIG_I2S_CH_NUM * CONFIG_AUDIO_BIT_DEPTH_OCTETS)
#endif /* ((CONFIG_AUDIO_FRAME_DURATION_US == 7500) && CONFIG_SW_CODEC_LC3) */
 
#define BLOCK_SIZE_BYTES (FRAME_SIZE_BYTES / CONFIG_FIFO_FRAME_SPLIT_NUM)
 
/*
 * Calculate the number of samples in a block, divided by the number of samples
 * that will fit within a 32-bit word
 */
#define I2S_SAMPLES_NUM                                                                            \
        (BLOCK_SIZE_BYTES / (CONFIG_AUDIO_BIT_DEPTH_OCTETS) / (32 / CONFIG_AUDIO_BIT_DEPTH_BITS))
 
typedef void (*i2s_blk_comp_callback_t)(uint32_t frame_start_ts, uint32_t *rx_buf_released,
                                        uint32_t const *tx_buf_released);
 
void audio_i2s_set_next_buf(const uint8_t *tx_buf, uint32_t *rx_buf);
 
void audio_i2s_start(const uint8_t *tx_buf, uint32_t *rx_buf);
 
void audio_i2s_stop(void);
 
void audio_i2s_blk_comp_cb_register(i2s_blk_comp_callback_t blk_comp_callback);
 
void audio_i2s_init(void);
 
#endif /* _AUDIO_I2S_H_ */