pdm2pcm.c

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/* USER CODE BEGIN Header */
/* USER CODE END Header */
 
/* Includes ------------------------------------------------------------------*/
#include "pdm2pcm.h"
 
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
 
/* Global variables ---------------------------------------------------------*/
PDM_Filter_Handler_t PDM1_filter_handler;
PDM_Filter_Config_t PDM1_filter_config;
 
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
 
/* PDM2PCM init function */
void MX_PDM2PCM_Init(void)
{
  /* USER CODE BEGIN 2 */
  /* USER CODE END 2 */
 
  PDM1_filter_handler.bit_order = PDM_FILTER_BIT_ORDER_MSB;
  PDM1_filter_handler.endianness = PDM_FILTER_ENDIANNESS_LE;
  PDM1_filter_handler.high_pass_tap = 2104533974;
  PDM1_filter_handler.in_ptr_channels = 1;
  PDM1_filter_handler.out_ptr_channels = 1;
  PDM_Filter_Init(&PDM1_filter_handler);
 
  PDM1_filter_config.decimation_factor = PDM_FILTER_DEC_FACTOR_128;
  PDM1_filter_config.output_samples_number = 240;
  PDM1_filter_config.mic_gain = 24;
  PDM_Filter_setConfig(&PDM1_filter_handler, &PDM1_filter_config);
 
  /* USER CODE BEGIN 3 */
  /* USER CODE END 3 */
 
}
 
/* USER CODE BEGIN 4 */
 
/*  process function */
uint8_t MX_PDM2PCM_Process(uint16_t *PDMBuf, uint16_t *PCMBuf)
{
  /*
  uint8_t BSP_AUDIO_IN_PDMToPCM(uint16_t * PDMBuf, uint16_t * PCMBuf)
 
  Converts audio format from PDM to PCM.
  Parameters:
    PDMBuf : Pointer to PDM buffer data
    PCMBuf : Pointer to PCM buffer data
  Return values:
    AUDIO_OK in case of success, AUDIO_ERROR otherwise
  */
  /* this example return the default status AUDIO_ERROR */
  PDM_Filter((void*)PDMBuf, (void*)PCMBuf, &PDM1_filter_handler);
  return (uint8_t) 0;
 
}
 
/* USER CODE END 4 */
 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/