STM32F407 Discovery INMP441 MEMS Read Problem

[gşen.1]

int main(void)
{
  /* USER CODE BEGIN 1 */
arm_cfft_radix4_instance_f32 S;    
float32_t maxValue;               
uint32_t maxIndex;                
uint16_t i;
uint16_t height[128];
  /* USER CODE END 1 */
 
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DAC_Init();
  MX_TIM2_Init();
  MX_I2S3_Init();
  /* USER CODE BEGIN 2 */
	HAL_Delay(100);
 
  HAL_TIM_Base_Start_IT(&htim2);
	
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
		HAL_I2S_Receive(&hi2s3,(uint16_t *)buffer,512,100);
 
//		for(uint16_t y=0;y<SAMPLES;y++)
//		{
//			buffer[y] >>= 14;
//		}
		
		
		for (i = 0; i < SAMPLES; i++) {
     
			Input[(uint16_t)i] = (float32_t)((buffer[i] - (float32_t)16777215.0) / (float32_t)16777215.0);
            
//      Input[(uint16_t)(i+1)] = 0;
		}
		
		arm_cfft_radix4_init_f32(&S, FFT_SIZE, 0, 1);
		
		arm_cfft_radix4_f32(&S, Input);
		
		arm_cmplx_mag_f32(Input, Output, FFT_SIZE);
		
		arm_max_f32(Output, FFT_SIZE, &maxValue, &maxIndex);
		
 
		for(uint16_t k=0;k<FFT_SIZE/2;k++)
		{
			deger[k]=(float32_t)Output[k];
		}
 
  }
  /* USER CODE END 3 */
}
 
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
 
  /** Configure the main internal regulator output voltage 
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 4;
  RCC_OscInitStruct.PLL.PLLN = 168;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S;
  PeriphClkInitStruct.PLLI2S.PLLI2SN = 98;
  PeriphClkInitStruct.PLLI2S.PLLI2SR = 2;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
}
 
/**
  * @brief DAC Initialization Function
  * @param None
  * @retval None
  */
static void MX_DAC_Init(void)
{
 
  /* USER CODE BEGIN DAC_Init 0 */
 
  /* USER CODE END DAC_Init 0 */
 
  DAC_ChannelConfTypeDef sConfig = {0};
 
  /* USER CODE BEGIN DAC_Init 1 */
 
  /* USER CODE END DAC_Init 1 */
  /** DAC Initialization 
  */
  hdac.Instance = DAC;
  if (HAL_DAC_Init(&hdac) != HAL_OK)
  {
    Error_Handler();
  }
  /** DAC channel OUT1 config 
  */
  sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
  if (HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN DAC_Init 2 */
 
  /* USER CODE END DAC_Init 2 */
 
}
 
/**
  * @brief I2S3 Initialization Function
  * @param None
  * @retval None
  */
static void MX_I2S3_Init(void)
{
 
  /* USER CODE BEGIN I2S3_Init 0 */
 
  /* USER CODE END I2S3_Init 0 */
 
  /* USER CODE BEGIN I2S3_Init 1 */
 
  /* USER CODE END I2S3_Init 1 */
  hi2s3.Instance = SPI3;
  hi2s3.Init.Mode = I2S_MODE_MASTER_RX;
  hi2s3.Init.Standard = I2S_STANDARD_MSB;
  hi2s3.Init.DataFormat = I2S_DATAFORMAT_24B;
  hi2s3.Init.MCLKOutput = I2S_MCLKOUTPUT_DISABLE;
  hi2s3.Init.AudioFreq = I2S_AUDIOFREQ_44K;
  hi2s3.Init.CPOL = I2S_CPOL_LOW;
  hi2s3.Init.ClockSource = I2S_CLOCK_PLL;
  hi2s3.Init.FullDuplexMode = I2S_FULLDUPLEXMODE_DISABLE;
  if (HAL_I2S_Init(&hi2s3) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2S3_Init 2 */
 
  /* USER CODE END I2S3_Init 2 */
 
}

I am trying to read data from INMP441 mems sensor with I2S protocol with stm32f407 discovery, with 24bit 32 frame configuration at 44khz, but I think I have a problem in reading my codes above, can you help me?

[Vangelis Fortounas]

Hello

A value 96 to PLLI2S.PLLI2SN gives less clock error than 98. (for 44kHz clock freq)

>>HAL_I2S_Receive(&hi2s3,(uint16_t *)buffer,512,100);

this function asks for 256 samples. Is SAMPLES 256?

[gşen.1]

As you said, I ran it at 96 Mhz. My problem is solved. I concluded the process by reading 2 times in I2S and combining 16-bit data. Thank you.