I was trying to get PCM value from a MEMS microphone and this is the program below. Can someone tell me what is wrong?

[SPaul.2]

#include "main.h"

#include "pdm2pcm.h"

/* Private includes ----------------------------------------------------------*/

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/

/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/

/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

CRC_HandleTypeDef hcrc;

I2S_HandleTypeDef hi2s2;

DMA_HandleTypeDef hdma_spi2_rx;

RTC_HandleTypeDef hrtc;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_DMA_Init(void);

static void MX_CRC_Init(void);

static void MX_I2S2_Init(void);

static void MX_RTC_Init(void);

uint16_t PDM_Buf[16];     

uint16_t PCM_Buf[16];

PDM_Filter_Handler_t Filterdb_handler;

int main(void)

{

 HAL_Init();

 SystemClock_Config();

 MX_GPIO_Init();

 MX_DMA_Init();

 MX_CRC_Init();

 MX_I2S2_Init();

 MX_RTC_Init();

 MX_PDM2PCM_Init();

 while (1)

 {

 HAL_I2S_Receive_DMA(&hi2s2, PDM_Buf,1);

 PDM_Filter(PDM_Buf,PCM_Buf, (PDM_Filter_Handler_t *)&Filterdb_handler);

 }

}

[waclawek.jan]

> Can someone tell me what is wrong?

No.

We don't know nohing about your hardware, and we don't know why are you writing here at all.

What are the symptoms and how are they different from expectations? Have you observed the signals using oscilloscope/logic analyzer? Have you observed the content of buffers?

JW