pdm.h

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/*
 * SPDX-FileCopyrightText: 2020 Inria
 * SPDX-FileCopyrightText: 2024-2026 HAW Hamburg
 * SPDX-License-Identifier: LGPL-2.1-only
 */
 
#pragma once

 
#include <stdint.h>
 
#include "periph_cpu.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#ifndef HAVE_PDM_MODE_T
typedef enum {
    PDM_MODE_MONO = 0,      
    PDM_MODE_STEREO,        
} pdm_mode_t;
#endif

#ifndef PDM_GAIN_MIN
#  define PDM_GAIN_MIN        (-20)
#endif

#ifndef PDM_GAIN_MAX
#  define PDM_GAIN_MAX        (20)
#endif

#ifndef PDM_BUF_SIZE
#  define PDM_BUF_SIZE        (64U)
#endif

typedef void (*pdm_data_cb_t)(void *arg, int16_t *buf);

#ifndef HAVE_PDM_ISR_CTX_T
typedef struct {
    pdm_data_cb_t cb;       
    void *arg;              
} pdm_isr_ctx_t;
#endif

int32_t pdm_init(pdm_mode_t mode, uint32_t rate, int8_t gain,
                 pdm_data_cb_t cb, void *arg);

void pdm_start(void);

void pdm_stop(void);

void pdm_deinit(void);
 
#ifdef __cplusplus
}
#endif