-----------------------------------------
DMA setup
-----------------------------------------


static void MX_DMA_Init(void)
{

  /* DMA controller clock 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);

}


-----------------------------------------
ADC setup
-----------------------------------------

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 = ENABLE;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.NbrOfDiscConversion = 1;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
  hadc1.Init.OversamplingMode = ENABLE;											/* Oversampling enabled */
  hadc1.Init.Oversampling.Ratio = ADC_OVERSAMPLING_RATIO_64;					/* Oversampling ratio */
  hadc1.Init.Oversampling.RightBitShift = ADC_RIGHTBITSHIFT_3;					/* Right shift of the oversampled summation */
  hadc1.Init.Oversampling.TriggeredMode = ADC_TRIGGEREDMODE_SINGLE_TRIGGER;   	/* Specifies whether or not a trigger is needed for each sample */
  hadc1.Init.Oversampling.OversamplingStopReset = ADC_REGOVERSAMPLING_CONTINUED_MODE; /* Specifies whether or not the oversampling buffer is maintained during injection sequence */
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }

  if (HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED) !=  HAL_OK)
  {
	  Error_Handler();
  }
  /** Configure Regular Channel 
  */
  sConfig.Channel = ADC_CHANNEL_4;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_640CYCLES_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 */

}

-----------------------------------------
further stm32l4xx_hal_msp.c setup code
-----------------------------------------


void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(hadc->Instance==ADC1)
  {
	  /* USER CODE BEGIN ADC1_MspInit 0 */

	  /* USER CODE END ADC1_MspInit 0 */
		/* Peripheral clock enable */
		HAL_RCC_ADC_CLK_ENABLED++;
		if(HAL_RCC_ADC_CLK_ENABLED==1){
		  __HAL_RCC_ADC_CLK_ENABLE();
		}

		__HAL_RCC_GPIOC_CLK_ENABLE();
		/**ADC1 GPIO Configuration
		PC4     ------> ADC1_INx
		*/
		GPIO_InitStruct.Pin = GPIO_PIN_4;
		GPIO_InitStruct.Mode = GPIO_MODE_ANALOG_ADC_CONTROL;
		GPIO_InitStruct.Pull = GPIO_NOPULL;
		HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

		/* ADC1 DMA Init */
		/* ADC1 Init */
		hdma_adc1.Instance = DMA1_Channel1;
		hdma_adc1.Init.Request = DMA_REQUEST_0;
		hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
		hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
		hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
		hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
		hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
		hdma_adc1.Init.Mode = DMA_NORMAL;
		hdma_adc1.Init.Priority = DMA_PRIORITY_MEDIUM;
		if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
		{
		  Error_Handler();
		}

		__HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1);

	  /* USER CODE BEGIN ADC1_MspInit 1 */

	  /* USER CODE END ADC1_MspInit 1 */
  }
  

-----------------------------------------
DMA interrupt handler
-----------------------------------------

void DMA1_Channel1_IRQHandler(void)
{
  /* USER CODE BEGIN DMA1_Channel1_IRQn 0 */

  /* USER CODE END DMA1_Channel1_IRQn 0 */
  HAL_DMA_IRQHandler(hadc1.DMA_Handle);	//(&hdma_adc1);
  /* USER CODE BEGIN DMA1_Channel1_IRQn 1 */

  /* USER CODE END DMA1_Channel1_IRQn 1 */
}