ra8_pdm.h

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#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdint.h>
 
#include "ra8_err.h"

typedef enum : uint8_t {
  k_ra8_pdm_ch0      = 0U, 
  k_ra8_pdm_ch1      = 1U, 
  k_ra8_pdm_ch2      = 2U, 
  k_ra8_pdm_ch_count = 3U, 
} ra8_pdm_channel_t;

typedef enum : uint8_t {
  k_ra8_pdm_hpf_h_count  = 2U,  
  k_ra8_pdm_comp_h_count = 11U, 
  k_ra8_pdm_lpf_h1_count = 20U, 
} ra8_pdm_coeff_count_t;

typedef struct {
  uint8_t  sinc_order;                     
  uint8_t  clock_div;                      
  uint8_t  sinc_dec;                       
  uint8_t  sinc_range;                     
  uint8_t  data_shift;                     
  uint8_t  edge;                           
  uint8_t  hpf_shift;                      
  uint8_t  cf_shift;                       
  uint8_t  lpf_shift;                      
  uint8_t  rx_threshold;                   
  uint16_t hpf_s0;                         
  uint16_t hpf_k1;                         
  uint16_t hpf_h[k_ra8_pdm_hpf_h_count];   
  uint16_t comp_h[k_ra8_pdm_comp_h_count]; 
  uint16_t lpf_h0;                         
  uint16_t lpf_h1[k_ra8_pdm_lpf_h1_count]; 
} ra8_pdm_channel_cfg_t;

typedef void (*ra8_pdm_data_callback_t)(void* ctx, const int32_t* samples, uint32_t count);

[[nodiscard]] ra8_err_t ra8_pdm_init(void);

[[nodiscard]] ra8_err_t ra8_pdm_deinit(void);

[[nodiscard]] ra8_err_t ra8_pdm_configure(uint8_t ch, const ra8_pdm_channel_cfg_t* cfg);

[[nodiscard]] ra8_err_t ra8_pdm_start(uint8_t ch);

[[nodiscard]] ra8_err_t ra8_pdm_read_enable(uint8_t ch);

[[nodiscard]] ra8_err_t ra8_pdm_read(uint8_t ch, int32_t* out, uint32_t max, uint32_t* out_count);

[[nodiscard]] ra8_err_t
ra8_pdm_stream_enable(uint8_t ch, ra8_pdm_data_callback_t callback, void* ctx, uint8_t priority);

[[nodiscard]] ra8_err_t ra8_pdm_stream_disable(uint8_t ch);

[[nodiscard]] ra8_err_t ra8_pdm_stop(uint8_t ch);
 
#ifdef __cplusplus
}
#endif