ADC channel 0 with DMA ?

Dear Members,

I tried to initialize ADC1 channel 0 with DMA but I got not output yet,

Init code :

ADC_HandleTypeDef hadc;
DMA_HandleTypeDef hdma_adc;
 
/* ADC init function */
void MX_ADC_Init(void)
{
 ADC_ChannelConfTypeDef sConfig = {0};
 
 /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) 
 */
 hadc.Instance = ADC1;
 hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
 hadc.Init.Resolution = ADC_RESOLUTION_12B;
 hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
 hadc.Init.ScanConvMode = ADC_SCAN_ENABLE;
 hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
 hadc.Init.LowPowerAutoWait = ADC_AUTOWAIT_DISABLE;
 hadc.Init.LowPowerAutoPowerOff = ADC_AUTOPOWEROFF_DISABLE;
 hadc.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
 hadc.Init.ContinuousConvMode = ENABLE;
 hadc.Init.NbrOfConversion = 1;
 hadc.Init.DiscontinuousConvMode = DISABLE;
 hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
 hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
 hadc.Init.DMAContinuousRequests = ENABLE;
 if (HAL_ADC_Init(&hadc) != HAL_OK)
 {
 Error_Handler();
 }
 /**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. 
 */
 sConfig.Channel = ADC_CHANNEL_0;
 sConfig.Rank = ADC_REGULAR_RANK_1;
 sConfig.SamplingTime = ADC_SAMPLETIME_384CYCLES;
 if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 
}
 
void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{
 
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 if(adcHandle->Instance==ADC1)
 {
 /* USER CODE BEGIN ADC1_MspInit 0 */
 
 /* USER CODE END ADC1_MspInit 0 */
 /* ADC1 clock enable */
 __HAL_RCC_ADC1_CLK_ENABLE();
 
 __HAL_RCC_GPIOA_CLK_ENABLE();
 /**ADC GPIO Configuration 
 PA0-WKUP1 ------> ADC_IN0
 PA1 ------> ADC_IN1
 PA6 ------> ADC_IN6
 PA7 ------> ADC_IN7 
 */
 GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_6|GPIO_PIN_7;
 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
 /* ADC1 DMA Init */
 /* ADC Init */
 hdma_adc.Instance = DMA1_Channel1;
 hdma_adc.Init.Direction = DMA_PERIPH_TO_MEMORY;
 hdma_adc.Init.PeriphInc = DMA_PINC_DISABLE;
 hdma_adc.Init.MemInc = DMA_MINC_ENABLE;
 hdma_adc.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
 hdma_adc.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
 hdma_adc.Init.Mode = DMA_CIRCULAR;
 hdma_adc.Init.Priority = DMA_PRIORITY_LOW;
 if (HAL_DMA_Init(&hdma_adc) != HAL_OK)
 {
 Error_Handler();
 }
 
 __HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc);
 
 /* ADC1 interrupt Init */
 HAL_NVIC_SetPriority(ADC1_IRQn, 0, 0);
 HAL_NVIC_EnableIRQ(ADC1_IRQn);
 /* USER CODE BEGIN ADC1_MspInit 1 */
 
 /* USER CODE END ADC1_MspInit 1 */
 }
}

on main

 HAL_ADC_Start_DMA (&hadc1, (uint32_t *) adc_buf, 2); 			

inside while :

display_value[0] = adc_val[0];
 display_value[1] = adc_val[1];	
			printf("ADC value 0 %u \r\n",display_value[0]);
			printf("ADC value 1 %u \r\n",display_value[1]);

on callback

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) 
{ 
 
	if (hadc->Instance == ADC1)
	{
				for (int i=0;i<2;i++)
					{
						adc_val[i] = adc_buf[i];
					}
					
 
	}		
 
}

variable :

	ADC_HandleTypeDef hadc1;
		uint32_t adc_buf[2], adc_val[2], display_value[2];
 

Anything I should add ?

thanks