micCapture_saiPdm.c

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/*
* 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
*
*/
 
#include "micCapture_saiPdm.h"
#include "pdm2pcm.h"
#include "micCapture_task.h"
#include "stdio.h"
#define MIC_CAPTURE_PDM_BUFF_SIZE_BYTES          (MIC_CAPTURE_IT_MS * 2 * 2048 / 8) /* 256 kHz frequency expected on SAI ; 2x for pingPong */
#define MIC_CAPTURE_PCM_BUFF_SIZE_SAMPLES        (MIC_CAPTURE_IT_MS * 16)           /* ms @16kHz */
#define MIC_CAPTURE_MEMORY_SECTION_HW_BUFFERS    ".NOCACHE_Section"
 
 
 
#if defined ( __ICCARM__ ) 
  #pragma data_alignment=4
  #ifdef MIC_CAPTURE_MEMORY_SECTION_HW_BUFFERS
    __ALIGN_BEGIN uint8_t PDM_Buffer[MIC_CAPTURE_PDM_BUFF_SIZE_BYTES] __ALIGN_END @ MIC_CAPTURE_MEMORY_SECTION_HW_BUFFERS;
  #else
    __ALIGN_BEGIN uint8_t PDM_Buffer[MIC_CAPTURE_PDM_BUFF_SIZE_BYTES] __ALIGN_END;
  #endif
 
 
#else /* keil & (__GNUC__)*/
  __attribute__((__section__(MIC_CAPTURE_MEMORY_SECTION_HW_BUFFERS)))
  __ALIGN_BEGIN uint8_t PDM_Buffer[MIC_CAPTURE_PDM_BUFF_SIZE_BYTES] __ALIGN_END;
#endif
 
int16_t PCM_Buffer[MIC_CAPTURE_PCM_BUFF_SIZE_SAMPLES];
 
 
 
int mic_capture_start(void)
{
  mic_capture_createTask();
  return HAL_SAI_Receive_DMA(&hsai_BlockA4, PDM_Buffer, (uint16_t)MIC_CAPTURE_PDM_BUFF_SIZE_BYTES);
}
 
 
void HAL_SAI_RxHalfCpltCallback(SAI_HandleTypeDef *hsai)
{
  /* Call the record update function to get the second half */
  /* Invalidate Data Cache to get the updated content of the SRAM*/
  SCB_InvalidateDCache_by_Addr(PDM_Buffer, MIC_CAPTURE_PDM_BUFF_SIZE_BYTES / 2);
  MX_PDM2PCM_Process((uint16_t *)PDM_Buffer, (uint16_t *)PCM_Buffer);
  mic_capture_processTask();
}
 
 
void HAL_SAI_RxCpltCallback(SAI_HandleTypeDef *hsai)
{
  /* Call the record update function to get the second half */
  /* Invalidate Data Cache to get the updated content of the SRAM*/
  SCB_InvalidateDCache_by_Addr(&PDM_Buffer[MIC_CAPTURE_PDM_BUFF_SIZE_BYTES / 2], MIC_CAPTURE_PDM_BUFF_SIZE_BYTES / 2);
  MX_PDM2PCM_Process((uint16_t *)(&PDM_Buffer[MIC_CAPTURE_PDM_BUFF_SIZE_BYTES / 2]), (uint16_t *)PCM_Buffer);
  mic_capture_processTask();
}
 
 
void HAL_SAI_ErrorCallback(SAI_HandleTypeDef *hsai)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hsai);
  while (1);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_SAI_ErrorCallback could be implemented in the user file
   */
}