So i have been trying to set up my ADC conversion on my Nucleo-L432KC and have been having a hard time. i recently have been working on a Nucleo-F303RE which is a 64 pin nucleo and my 5 channel ADC conversions using DMA where working great.
I then decided to downgrade to a nucleo-L432KC (32 pin nucleo). i used the same steps i did for the F303 but this time it doesn't work. I looked in to it a bit and found that it would never enter the HAL\_ADC\_ConvCpltCallback. another post talking about it [What is missing to make stm32 ADC DMA work? Transfer Compete does not occur](https://stackoverflow.com/questions/44537901/what-is-missing-to-make-stm32-adc-dma-work-transfer-compete-does-not-occur/49818141#49818141). the solution of this post says that the core clock was to slow compared to the adc conversion clock and so did not wave the time to call the function. i was looking into the clock systeme on CubeMx and have a hard time with the clock set up. the f303RE was more strait forward and this one i get kinda lost. any one have some tips on what i should change to make this work. here is the cube mx set up: [voila](https://i.stack.imgur.com/hveX3.png).
here is my DMA set up:

```
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);

}

```

and here is my adc set up:

```
static void MX_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig;

     /**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_ENABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc1.Init.LowPowerAutoWait = DISABLE;
  hadc1.Init.ContinuousConvMode = DISABLE;
  hadc1.Init.NbrOfConversion = 5;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.NbrOfDiscConversion = 1;
  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(__FILE__, __LINE__);
 }

  /**Configure Regular Channel 
   */
  sConfig.Channel = ADC_CHANNEL_8;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_47CYCLES_5;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    //_Error_Handler(__FILE__, __LINE__);
  }

    /**Configure Regular Channel 
    */
  sConfig.Channel = ADC_CHANNEL_9;
  sConfig.Rank = ADC_REGULAR_RANK_2;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    //_Error_Handler(__FILE__, __LINE__);
  }

    /**Configure Regular Channel 
    */
  sConfig.Channel = ADC_CHANNEL_10;
  sConfig.Rank = ADC_REGULAR_RANK_3;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    //_Error_Handler(__FILE__, __LINE__);
  }

    /**Configure Regular Channel 
    */
  sConfig.Channel = ADC_CHANNEL_11;
  sConfig.Rank = ADC_REGULAR_RANK_4;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    //_Error_Handler(__FILE__, __LINE__);
  }

    /**Configure Regular Channel 
    */
  sConfig.Channel = ADC_CHANNEL_12;
  sConfig.Rank = ADC_REGULAR_RANK_5;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    //_Error_Handler(__FILE__, __LINE__);
  }

}

```

and finally my code:

```
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef& hadc){
    if(hadc.Instance == ADC1){
        adc_IT_flag = 1;
    }
}
void filtreRead(void){
    fenGlisflex(ADC_BUF[0],flex0);
    fenGlisflex(ADC_BUF[1],flex1);
    fenGlisflex(ADC_BUF[2],flex2);
    fenGlisflex(ADC_BUF[3],flex3);
    fenGlisflex(ADC_BUF[4],flex4);
    data_stable(flex0);
    data_stable(flex1);
    data_stable(flex2);
    data_stable(flex3);
    data_stable(flex4);
    adc_IT_flag = 0;
    HAL_ADC_Start_IT(&hadc1);
}
int main(void)
{
  HAL_Init();

  SystemClock_Config();

  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USART2_UART_Init();
  MX_I2C1_Init();
  MX_USART1_UART_Init();
  MX_ADC1_Init();

  HAL_ADC_Start_DMA(&hadc1,(uint32_t*)ADC_BUF,5);
  HAL_ADC_Start_IT(&hadc1);

  while (1)
  {
      if(adc_IT_flag){
          filtreRead();
      }
  }
}

```

here is my new DMA Init function :

```
static void MX_DMA_Init(void) 
{
  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

   hdma_adc1.Instance = DMA1_Channel1;
   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_WORD;
   hdma_adc1.Init.MemDataAlignment = DMA_PDATAALIGN_WORD;
   hdma_adc1.Init.Mode = DMA_CIRCULAR;
   hdma_adc1.Init.Priority = DMA_PRIORITY_LOW;
   HAL_DMA_DeInit(&hdma_adc1);
   HAL_DMA_Init(&hdma_adc1);

   //__HAL_LINKDMA(hadc, DMA_Handle, hdma_adc1);
  /* DMA interrupt init */
  /* DMA1_Channel1_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);

}

```