pdm_filter.h

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/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __PDM_FILTER_H
#define __PDM_FILTER_H

#ifdef __cplusplus
 extern "C" {
#endif

/* Includes ------------------------------------------------------------------*/
#include <stdint.h>


/* Exported types ------------------------------------------------------------*/
typedef struct {
  uint16_t Fs;
  float LP_HZ;
  float HP_HZ;
  uint16_t In_MicChannels;
  uint16_t Out_MicChannels;
  char InternalFilter[34];
} PDMFilter_InitStruct;

/* Exported constants --------------------------------------------------------*/
/* Exported macros -----------------------------------------------------------*/
#define HTONS(A)  ((((uint16_t)(A) & 0xff00) >> 8) | \
                   (((uint16_t)(A) & 0x00ff) << 8))

/* Exported functions ------------------------------------------------------- */
void PDM_Filter_Init(PDMFilter_InitStruct * Filter);

int32_t PDM_Filter_64_MSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
int32_t PDM_Filter_80_MSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
int32_t PDM_Filter_128_MSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
int32_t PDM_Filter_64_LSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
int32_t PDM_Filter_80_LSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
int32_t PDM_Filter_128_LSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);

#ifdef __cplusplus
}
#endif

#endif /* __PDM_FILTER_H */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/