ADC sampling time measurement

[Muhammed Güler]

I have a reading problem with dmaWhen reading multi channel with ADC dma I need to know when to sample each channel. In the ADC input, I found a 2us transient in the oscilloscope output below. I considered this transient as adc sampling time and adjusted the delays. (I had to put 138us delay for 160us) are there any errors in my route?

Also, the transient contains 2 peaks, I couldn't understand where the second peak came from.

My code for ADC sampling(I have a reading problem with dma)

delayMicroseconds(IRDelay - 22);//22us adc start delay
HAL_ADC_Start_DMA(&hadc,ADC_Reads,2); // ADC_Reads is dummy

void DMA1_Channel1_IRQHandler(void)
{
  /* USER CODE BEGIN DMA1_Channel1_IRQn 0 */
	ADCReads[i] = (hadc.Instance->DR); //my reading point
	i = 1-i;
  /* USER CODE END DMA1_Channel1_IRQn 0 */
  HAL_DMA_IRQHandler(&hdma_adc);
  /* USER CODE BEGIN DMA1_Channel1_IRQn 1 */
	
  /* USER CODE END DMA1_Channel1_IRQn 1 */
}