Electronics > Microcontrollers

STM32 : ADC with DMA and Timer

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gab_22:
Hi!
I'm trying to convert 4 ADC channels with interrupt and DMA on my STM32 dev board (nucleo F303RE) the goal is to start a conversion periodically and transfer the results through the DMA. But unfortunately, it doesn't work :(

Here is the configuration, I use STM32CubeIDE.

ADC Conf
[attachimg=1]
[attachimg=2]
[attachimg=3]


TIM4 Conf
[attachimg=4]

And here my code

--- Code: ---/* USER CODE BEGIN PV */
uint16_t raw[4];
uint8_t ADDCPLT = 0;
/* USER CODE END PV */

--- End code ---


--- Code: ---/* USER CODE BEGIN 2 */
  HAL_ADC_Start_DMA(&hadc1, (uint16_t)*raw, 4);
  HAL_TIM_Base_Start_IT(&htim4);
  /* USER CODE END 2 */
--- End code ---

main loop

--- Code: ---while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  if(ADDCPLT)
  {
  HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
  ADDCPLT = 0;
  }
  }
  /* USER CODE END 3 */
--- End code ---


--- Code: ---/* USER CODE BEGIN 4 */
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
if(hadc->Instance == ADC1)
{
ADDCPLT = 255;
}
}
/* USER CODE END 4 */
--- End code ---

When I start the program on the target, I see LD2 blinking at ~10Hz as expected, but I don't see anything in raw[4] variables. (checked with STM32CubeIDE integrated debugger) I think I forgot something somewhere... Do you have any ideas?
Thanks

Georgy.Moshkin:
I think it should be
--- Code: --- HAL_ADC_Start_DMA(&hadc1, (uint16_t*)&raw, 4);
--- End code ---
And check this:

--- Code: ---/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init(); // <-- this should be placed before MX_ADC_Init()
MX_ADC1_Init(); // <-- this should be placed after MX_DMA_Init()
...

--- End code ---

MasterT:
Check it out:
https://github.com/STMicroelectronics/STM32CubeF3/tree/master/Projects/STM32F303RE-Nucleo/Examples/ADC/ADC_Sequencer

CubeMX has an examples worth to study

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