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External interrupt for trigger ADC

Question asked by shams.hamed on Jul 7, 2016
Latest reply on Jul 8, 2016 by waclawek.jan
Hi
I use EXTI for trigger ADC for stm32f103.
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
  /* DMA1 Channel1 Configuration ----------------------------------------------*/
  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC3ConvertedValue;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 300;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);
 
    /* Enable DMA Stream Half / Transfer Complete interrupt */
  //DMA_ITConfig(DMA1_Channel1, DMA_IT_TC | DMA_IT_HT, ENABLE);
     
  /* Enable DMA1 channel1 */
  DMA_Cmd(DMA1_Channel1, ENABLE);
//////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////
 
 
     /* ADC1 configuration ------------------------------------------------------*/
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConv =ADC_ExternalTrigConv_Ext_IT11_TIM8_TRGO ;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1, &ADC_InitStructure);
//////////////////////////////////////////////////////////////////////////////////////////////////

  ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 1, ADC_SampleTime_1Cycles5); //c2 ==for voltage /* Regular discontinuous mode channel number configuration */
  ADC_DiscModeChannelCountConfig(ADC1, 1);
  /* Enable regular discontinuous mode */
  ADC_DiscModeCmd(ADC1, ENABLE);

  /* Enable ADC1 external trigger conversion */
  ADC_ExternalTrigConvCmd(ADC1, ENABLE);
    
  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);
    
     

  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);

  /* Enable ADC1 reset calibration register */   
  ADC_ResetCalibration(ADC1);
  /* Check the end of ADC1 reset calibration register */
  while(ADC_GetResetCalibrationStatus(ADC1));

  /* Start ADC1 calibration */
  ADC_StartCalibration(ADC1);
  /* Check the end of ADC1 calibration */
  while(ADC_GetCalibrationStatus(ADC1));
//////////////////////////////////////////////////////////////////////////////////////////////////

The below code is for configuring EXTI.

void EXTI11_Config(void)
{
     GPIO_InitTypeDef GPIO_InitStructure;
     
  /* Enable GPIOA clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
   
  /* Configure PA.00 pin as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
   
  /* Enable AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
 
  /* Connect EXTI0 Line to PB.11 pin */
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource11);
 
  /* Configure EXTI0 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line11;
  EXTI_InitStructure.EXTI_Mode =EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling; 
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
 
//  /* Enable and set EXTI0 Interrupt to the lowest priority */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}
It works. When I connect the EXTI_Line11 to the square wave the ADC convert the analog input and put them into the ADC3ConvertedValue.
I adjust EXTI for rising and falling edge.

I want to calculate data between two rising and falling edge of the external interrupt .

But I dont know which section of the ADC3ConvertedValue is linked to the time of converting between two rising and falling edge of external interrupt?
conv1.png
Regards

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