Nucleo STM32G431KB I2S

[AntoR]

Hello

I tried to implement I2S on the chip in question to send the data acquired by the on-board ADC (I tried both 8-bit and 12-bit) with DMA active on a curved buffer and half-word data size. The data should be read by an ESP32, connected to it on the ws, bclk and din lines configured as I2S Master that provides the clock and the ws and that should momentarily only print the received data on the serial monitor. However, despite having set the I2S channel of the STM32 to 8Khz 16 bit only right with Philips standard, equating it to that of the ESP32, I do not get the expected data, I can print only zeros or numbers that apparently are not synchronous data. I also tried to transmit static arrays with predefined values ​​instead of the ADC to have a clear feedback on the receiving end but nothing. I wonder if the STM32G431KB core is the right board to do these tests or should I look at another model?

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2024 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.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 */


#define BUFFERSIZE_DATA 64
#define I2S_DATA_SIZE 64
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;

I2S_HandleTypeDef hi2s2;
DMA_HandleTypeDef hdma_spi2_tx;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */
uint16_t adc_value;
uint16_t bufferI2S_TX[I2S_DATA_SIZE];
uint16_t bufferI2S_RX[I2S_DATA_SIZE];

uint16_t bufferADC[BUFFERSIZE_DATA];

uint16_t bufferTest[BUFFERSIZE_DATA];


//uint16_t bufferTest[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

//uint16_t bufferTest[]={1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};

//uint16_t bufferTest[]={5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5};

/* 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_USART2_UART_Init(void);
static void MX_ADC1_Init(void);
static void MX_I2S2_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{

  /* USER CODE BEGIN 1 */

  /* 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_DMA_Init();
  MX_USART2_UART_Init();
  MX_ADC1_Init();
  MX_I2S2_Init();
  /* USER CODE BEGIN 2 */

  //HAL_TIM_Base_Start(&htim2);

  HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED);
  HAL_ADC_Start_DMA(&hadc1,(uint32_t*)&bufferADC,BUFFERSIZE_DATA);
  //HAL_I2S_Transmit_DMA(&hi2s2, (uint16_t*)bufferADC, I2S_DATA_SIZE);
  //HAL_I2S_Transmit_DMA(&hi2s2, (uint16_t*)bufferTest, I2S_DATA_SIZE);

  // Start SPI in DMA mode
  //HAL_SPI_TransmitReceive_DMA(&hspi1, bufferSPI_TX,bufferSPI_RX,BUFFERSIZE_DATA);
  //HAL_SPI_TransmitReceive_DMA(&hspi1, bufferSPI_TX,bufferSPI_RX,SPI_DATA_SIZE);
  //HAL_SPI_Transmit_DMA(&hspi1, bufferSPI_TX,BUFFERSIZE_DATA);



  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {


    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV2;
  RCC_OscInitStruct.PLL.PLLN = 25;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses 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_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief ADC1 Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_ADC1_Init(void)
{

  /* USER CODE BEGIN ADC1_Init 0 */

  /* USER CODE END ADC1_Init 0 */

  ADC_MultiModeTypeDef multimode = {0};
  ADC_ChannelConfTypeDef sConfig = {0};

  /* USER CODE BEGIN ADC1_Init 1 */

  /* USER CODE END ADC1_Init 1 */

  /** Common config
  */
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
  hadc1.Init.Resolution = ADC_RESOLUTION_8B;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.GainCompensation = 0;
  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc1.Init.LowPowerAutoWait = DISABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
  hadc1.Init.OversamplingMode = DISABLE;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure the ADC multi-mode
  */
  multimode.Mode = ADC_MODE_INDEPENDENT;
  if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_1;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN ADC1_Init 2 */

  /* USER CODE END ADC1_Init 2 */

}

/**
  * @brief I2S2 Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_I2S2_Init(void)
{

  /* USER CODE BEGIN I2S2_Init 0 */

  /* USER CODE END I2S2_Init 0 */

  /* USER CODE BEGIN I2S2_Init 1 */

  /* USER CODE END I2S2_Init 1 */
  hi2s2.Instance = SPI2;
  hi2s2.Init.Mode = I2S_MODE_SLAVE_TX;
  hi2s2.Init.Standard = I2S_STANDARD_PHILIPS;
  hi2s2.Init.DataFormat = I2S_DATAFORMAT_16B;
  hi2s2.Init.MCLKOutput = I2S_MCLKOUTPUT_DISABLE;
  hi2s2.Init.AudioFreq = I2S_AUDIOFREQ_8K;
  hi2s2.Init.CPOL = I2S_CPOL_LOW;
  if (HAL_I2S_Init(&hi2s2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2S2_Init 2 */

  /* USER CODE END I2S2_Init 2 */

}

/**
  * @brief USART2 Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_USART2_UART_Init(void)
{

  /* USER CODE BEGIN USART2_Init 0 */

  /* USER CODE END USART2_Init 0 */

  /* USER CODE BEGIN USART2_Init 1 */

  /* USER CODE END USART2_Init 1 */
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetTxFifoThreshold(&huart2, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetRxFifoThreshold(&huart2, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_DisableFifoMode(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART2_Init 2 */

  /* USER CODE END USART2_Init 2 */

}

/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)
{

  /* DMA controller clock enable */
  __HAL_RCC_DMAMUX1_CLK_ENABLE();
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Channel1_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
  /* DMA1_Channel3_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel3_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel3_IRQn);

}

/**
  * @brief GPIO Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(LEDOnBoard_GPIO_Port, LEDOnBoard_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin : PA12 */
  GPIO_InitStruct.Pin = GPIO_PIN_12;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : LEDOnBoard_Pin */
  GPIO_InitStruct.Pin = LEDOnBoard_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(LEDOnBoard_GPIO_Port, &GPIO_InitStruct);

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */

/*void HAL_ADC_ConvHalfCallback(ADC_HandleTypeDef* hadc1)  {

	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_SET);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_RESET);

}*/

/*void HAL_ADC_ConvHalfCallback(ADC_HandleTypeDef* hadc1)  {

	//HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_SET);
	HAL_I2S_Transmit_DMA(&hi2s2, (uint16_t*)bufferADC, I2S_DATA_SIZE);
    //HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_RESET);

}

void HAL_ADC_ConvHalfCallback(ADC_HandleTypeDef* hadc1)  {

	//HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_SET);
	HAL_I2S_Transmit_DMA(&hi2s2, (uint16_t*)bufferADC, I2S_DATA_SIZE);
    //HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_RESET);

}*/

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc1)  {

	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_SET);

    for(int i=0;i<I2S_DATA_SIZE;i++){
    	bufferTest[i]=127;
    }
	// Riavvia la ricezione per il prossimo byte
	//HAL_SPI_TransmitReceive_DMA(&hspi1,(uint8_t*)bufferSPI_TX,(uint8_t*)bufferSPI_RX, SPI_DATA_SIZE);
	// Trasmetti i dati dell'ADC tramite I2S
	HAL_I2S_Transmit_DMA(&hi2s2, (uint16_t*)bufferTest, I2S_DATA_SIZE);
	//HAL_I2S_Transmit_DMA(&hi2s2, (uint16_t*)bufferADC, I2S_DATA_SIZE);

	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_RESET);


}

/*void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef *hspi1)
  {
     //for(int i=0;i<BUFFERSIZE_DATA;i+=2){
	//	  // Quando viene ricevuto un byte, invia il valore dell'ADC
	//	  bufferSPI_TX[i] = (uint8_t)((bufferADC[i] >> 8) & 0xFF); // MSB
	//	  bufferSPI_TX[i+1] = (uint8_t)(bufferADC[i] & 0xFF);        // LSB



    // }
     // Riavvia la ricezione per il prossimo byte
	 //HAL_SPI_TransmitReceive_DMA(hspi1,(uint8_t*)bufferSPI_TX,(uint8_t*)bufferSPI_RX, SPI_DATA_SIZE);


	for(int i=0;i<SPI_DATA_SIZE;i++){

	    	 bufferSPI_TX[i]=bufferADC[i];
			 //bufferSPI_TX[i]=sinus_data[i];


	}

     // Riavvia la ricezione per il prossimo byte
	 HAL_SPI_TransmitReceive_DMA(hspi1,(uint8_t*)bufferSPI_TX,(uint8_t*)bufferSPI_RX, SPI_DATA_SIZE);
  }*/

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @PAram  file: pointer to the source file name
  * @PAram  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

[MOBEJ]

Hello @AntoR , 

Please insure  that Both  STM32G431KB and ESP32 need to have matching configurations:

• Sample Rate: Ensure both are set to 8kHz.
• Data Format: Both should be set to 16-bit.
• I2S Standard: Both should use the Philips standard.
• Master/Slave Configuration: Ensure the ESP32 is configured as the I2S master and the STM32 as the slave

and verify if the DMA is correctly configured on the STM32 to handle the data transfer efficiently. Double-check the circular buffer settings and ensure that the DMA is set to transfer half-word (16-bit) data, 

You can review the I2S example available under STM32CubeF4 package ( it can help for STM32G431KB )

STM32CubeF4/Projects/STM324xG_EVAL/Examples/I2S at master · STMicroelectronics/STM32CubeF4 · GitHub

Br

[AntoR]

thanks for the reply. I checked the operating modes and the connections are correct, if on ESP32 for example I connect a PCM5102 DAC it works correctly and then I repeated the configuration on the STM32 but this time as Slave TX without success. I also tried to configure the STM32 as Master Half Duplex TX to see if with the oscilloscope I obtained a bckl and ws signal from it both with mclk flagged and not flagged but neither of these two signals comes out and the thing is very strange. What else can I check?
Thanks

[AntoR]

basically I need to know if this card model is able to generate ws and bclk (with or without mclock) autonomously with I2S in MASTER Transmit mode?

[MOBEJ · Accepted solution]

Hello @AntoR  ,

DO you use an oscilloscope or logic analyzer to check the BCLK and WS signals in STM32G431KB ?

If these signals are not present, it indicates an issue with the clock configuration or peripheral initialization.

BR