HAL_ADC_PollForConversion gets stuck

[dfshea]

I'm writing software that involves reading a single ADC value from my STM32H7R3V8H6, however it is getting stuck in HAL_ADC_PollForConversion(&hadc1, HAL_MAX_DELAY);.

If i switch the delay to a smaller value it runs through but it still returns a timeout.

while (1)
  {
		HAL_ADC_Start(&hadc1);
		HAL_ADC_PollForConversion(&hadc1, 100);
		adc1Data = HAL_ADC_GetValue(&hadc1);
		HAL_ADC_Stop(&hadc1);
		//readT(&engine, 0);
		//readP(&engine, 0);
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }

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_ASYNC_DIV1;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc1.Init.LowPowerAutoWait = DISABLE;
  hadc1.Init.ContinuousConvMode = DISABLE;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.SamplingMode = ADC_SAMPLING_MODE_NORMAL;
  hadc1.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DR;
  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_0;
  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;
  sConfig.OffsetSign = ADC_OFFSET_SIGN_NEGATIVE;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN ADC1_Init 2 */

  /* USER CODE END ADC1_Init 2 */

}

[dfshea]

I misspoke, it doesn't return a timeout, it simply stays there forever. I looked into the code and it gets stuck in the loop that I put previously. That loop looks like it will return HAL_ERROR after some time, but its a very large amount of time.

[Karl Yamashita]

The ADC clock is enable from calling  MX_ADC1_Init>HAL_ADC_Init>HAL_ADC_MspInit

[Chris21]

Looks like the H7 is a bit different as far as the ADC Clock, it's set in RCC domain 3 kernel clock configuration register (RCC_D3CCIPR):

[Karl Yamashita]

---

@dfshea wrote:

I misspoke, it doesn't return a timeout, it simply stays there forever. I looked into the code and it gets stuck in the loop that I put previously. That loop looks like it will return HAL_ERROR after some time, but its a very large amount of time.

---

Did you use 100ms for the timeout?

[dfshea]

For the ADC calibration I didn't see any option for a timeout, just inputting the ADC handle and ADC_SINGLE_ENDED.

[Saket_Om]

Hello @dfshea 

Could you please share your project so that we can assist you more effectively?

[Karl Yamashita]

---

@dfshea wrote:

For the ADC calibration I didn't see any option for a timeout, just inputting the ADC handle and ADC_SINGLE_ENDED.

---

No, i'm at talking about when you call HAL_ADC_PollForConversion

If you pass 100ms and it doesn't timeout, then you have two issues. 

1. the ADC_FLAG_EOC flag isn't being set so you're stuck in the while loop.

2. HAL Tick isn't incrementing so it doesn't timeout.

Sounds like maybe something wasn't set up correctly or modified from default. Upload your IOC file

[dfshea]

I see, yes, when I call HAL_ADC_PollForConversion it does indeed time out after 100ms. I've attached the IOC below, let me know if you need anything else.