STM32G4 Dual Injected Simultaneous Mode ADC2 Returns 0

[batuhanky]

I'm using STM32G474 with dual ADC injected simultaneous mode. İndividual ADC injected mode works ok.

ADC1 is triggered by TIM1 Channel 4 and the interrupt is firing correctly, but ADC2 always returns zero.

Questions:

1. Why does ADC2->JDR1 always return 0 in dual injected simultaneous mode?
2. Is it correct that HAL_ADCEx_InjectedStart_IT(&hadc2) returns HAL_ERROR in dual mode?

You can see my ADC1 and ADC2 configuration.

void HAL_ADCEx_InjectedConvCpltCallback(ADC_HandleTypeDef* hadc)
{
    if (hadc->Instance == ADC1) {

    	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);
    	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);

        adc1 = ADC1->JDR1;

        adc2 = ADC2->JDR1;
    }

}

static void MX_ADC1_Init(void)
{

  /* USER CODE BEGIN ADC1_Init 0 */

  /* USER CODE END ADC1_Init 0 */

  ADC_MultiModeTypeDef multimode = {0};
  ADC_InjectionConfTypeDef sConfigInjected = {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_DIV4;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  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 = DISABLE;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.DMAContinuousRequests = DISABLE;
  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_DUALMODE_INJECSIMULT;
  multimode.DMAAccessMode = ADC_DMAACCESSMODE_DISABLED;
  multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_1CYCLE;
  if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Injected Channel
  */
  sConfigInjected.InjectedChannel = ADC_CHANNEL_2;
  sConfigInjected.InjectedRank = ADC_INJECTED_RANK_1;
  sConfigInjected.InjectedSamplingTime = ADC_SAMPLETIME_2CYCLES_5;
  sConfigInjected.InjectedSingleDiff = ADC_SINGLE_ENDED;
  sConfigInjected.InjectedOffsetNumber = ADC_OFFSET_NONE;
  sConfigInjected.InjectedOffset = 0;
  sConfigInjected.InjectedNbrOfConversion = 1;
  sConfigInjected.InjectedDiscontinuousConvMode = DISABLE;
  sConfigInjected.AutoInjectedConv = DISABLE;
  sConfigInjected.QueueInjectedContext = DISABLE;
  sConfigInjected.ExternalTrigInjecConv = ADC_EXTERNALTRIGINJEC_T1_CC4;
  sConfigInjected.ExternalTrigInjecConvEdge = ADC_EXTERNALTRIGINJECCONV_EDGE_RISING;
  sConfigInjected.InjecOversamplingMode = DISABLE;
  if (HAL_ADCEx_InjectedConfigChannel(&hadc1, &sConfigInjected) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_2;
  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 ADC2 Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_ADC2_Init(void)
{

  /* USER CODE BEGIN ADC2_Init 0 */

  /* USER CODE END ADC2_Init 0 */

  ADC_InjectionConfTypeDef sConfigInjected = {0};

  /* USER CODE BEGIN ADC2_Init 1 */

  /* USER CODE END ADC2_Init 1 */

  /** Common config
  */
  hadc2.Instance = ADC2;
  hadc2.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
  hadc2.Init.Resolution = ADC_RESOLUTION_12B;
  hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc2.Init.GainCompensation = 0;
  hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc2.Init.LowPowerAutoWait = DISABLE;
  hadc2.Init.ContinuousConvMode = DISABLE;
  hadc2.Init.NbrOfConversion = 1;
  hadc2.Init.DiscontinuousConvMode = DISABLE;
  hadc2.Init.DMAContinuousRequests = DISABLE;
  hadc2.Init.Overrun = ADC_OVR_DATA_PRESERVED;
  hadc2.Init.OversamplingMode = DISABLE;
  if (HAL_ADC_Init(&hadc2) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Injected Channel
  */
  sConfigInjected.InjectedChannel = ADC_CHANNEL_9;
  sConfigInjected.InjectedRank = ADC_INJECTED_RANK_1;
  sConfigInjected.InjectedSamplingTime = ADC_SAMPLETIME_2CYCLES_5;
  sConfigInjected.InjectedSingleDiff = ADC_SINGLE_ENDED;
  sConfigInjected.InjectedOffsetNumber = ADC_OFFSET_NONE;
  sConfigInjected.InjectedOffset = 0;
  sConfigInjected.InjectedNbrOfConversion = 1;
  sConfigInjected.InjectedDiscontinuousConvMode = DISABLE;
  sConfigInjected.AutoInjectedConv = DISABLE;
  sConfigInjected.QueueInjectedContext = DISABLE;
  sConfigInjected.InjecOversamplingMode = DISABLE;
  if (HAL_ADCEx_InjectedConfigChannel(&hadc2, &sConfigInjected) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN ADC2_Init 2 */

  /* USER CODE END ADC2_Init 2 */

}