rt-thread/bsp/stm32/stm32f469-st-disco/board/CubeMX_Config/Src/pdm2pcm.c

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
  * File Name          : pdm2pcm.c
  * Description        : This file provides code for the configuration
  *                      of the pdm2pcm instances.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2019 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                             www.st.com/SLA0044
  *
  ******************************************************************************
  */
/* 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_LSB;
  PDM1_filter_handler.endianness = PDM_FILTER_ENDIANNESS_BE;
  PDM1_filter_handler.high_pass_tap = 2104533974;
  PDM1_filter_handler.in_ptr_channels = 2;
  PDM1_filter_handler.out_ptr_channels = 2; 
  PDM_Filter_Init(&PDM1_filter_handler);

  PDM1_filter_config.decimation_factor = PDM_FILTER_DEC_FACTOR_64;
  PDM1_filter_config.output_samples_number = 16;
  PDM1_filter_config.mic_gain = 0; 
  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 */
  return (uint8_t) 1;
}

/* USER CODE END 4 */

/**
  * @}
  */

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