ADC DMA does not work

[FTrom]

I m trying to configure the ADC1 in DMA modality with STM32F303K8

when I debug the values does not change at all.

With the breakpoint i could see that DMA1_Channel1_IRQHandler is called.

/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim2;
TIM_HandleTypeDef htim3;
 
UART_HandleTypeDef huart1;
 
/* USER CODE BEGIN PV */
int32_t enc_value1;
int32_t enc_value2;
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(void);
static void MX_TIM3_Init(void);
static void MX_USART1_UART_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 */
	int32_t Count1=0;
	int32_t Count2=0;
  /* 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_TIM2_Init();
  MX_TIM3_Init();
  MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
  HAL_TIM_Encoder_Start_IT(&htim2, TIM_CHANNEL_ALL);
  HAL_TIM_Encoder_Start_IT(&htim3, TIM_CHANNEL_ALL);
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

void DMA1_Channel1_IRQHandler(void)
 
{
 
 /* USER CODE BEGIN DMA1_Channel1_IRQn 0 */
 
 
 
 /* USER CODE END DMA1_Channel1_IRQn 0 */
 
 HAL_DMA_IRQHandler(&hdma_adc1);
 
 /* USER CODE BEGIN DMA1_Channel1_IRQn 1 */
 
 
 
 /* USER CODE END DMA1_Channel1_IRQn 1 */
 
}

[Imen.D]

Hello @FTrom​ ,

You are missing the DMA initialization MX_DMA_Init(); which should be before other peripheral initialization.

Please try this, then let me know if this solved your issue, if so please "Select as Best" button.

Imen

[FTrom]

Hi Imen

if I understand correctly I should modify as

  HAL_Init();
 
  SystemClock_Config();
 
  MX_GPIO_Init();
  MX_USART2_UART_Init();
  MX_DMA_Init();
  MX_ADC1_Init();

But unfortunately, the values are stoked as before

Thanks

[TDK]

The code you posted in the OP doesn't initialize the ADC or the DMA.

[Imen.D · Accepted solution]

The DMA initialization MX_DMA_Init(); should be before other peripheral initialization.