stm32f100c8t6b,ADC-DMA,PA4采样时间过高引发误中断

afeng-366650

当开启PA0外部中断，ADC，DMA传输采样，PA4脚串联电阻拉低，会一直PA0外部中断，PA4脚上的ADC采样时间低于等于7.5周期才不会一直误中断，这难道是BUG吗？
 
switch (s){
    case Tmp_Samp:
   {
    ADC_Channels = 5;//通道数
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode =  ENABLE;//扫描方式
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//单次。连续转换选择
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//外部中断选择
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//数据右对齐
    ADC_InitStructure.ADC_NbrOfChannel = ADC_Channels;//指定多少通道转换
    ADC_Init(ADC1, &ADC_InitStructure);
    /* ADC1 regular channels configuration [规则模式通道配置]*/
    ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_55Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_55Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 3, ADC_SampleTime_55Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 4, ADC_SampleTime_55Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 5, ADC_SampleTime_55Cycles5);
   
    ADC1_1 = TRUE;
    ADC1_2 = TRUE;
    ADC1_5 = TRUE;
    ADC1_6 = TRUE;
    ADC1_7 = TRUE;
   
   break;
   }
    case Pwr_Samp:
   {
    ADC_Channels = 2;//通道数
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
     ADC_InitStructure.ADC_ScanConvMode =  ENABLE;//扫描方式
     ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//单次。连续转换选择
     ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//外部中断选择
     ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//数据右对齐
     ADC_InitStructure.ADC_NbrOfChannel = ADC_Channels;//指定多少通道转换
     ADC_Init(ADC1, &ADC_InitStructure);
    /* ADC1 regular channels configuration [规则模式通道配置]*/
     ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 1, ADC_SampleTime_239Cycles5);
     ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 2, ADC_SampleTime_7Cycles5); 
 
    ADC1_3 = TRUE;
    ADC1_4 = TRUE;
   //ADC_Channels = 2;//通道数
   break;
   }
    default:
            break;
      }
 
  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);
 
  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);
  /* Enable ADC1 reset calibaration register */  
  ADC_ResetCalibration(ADC1);
  /* Check the end of ADC1 reset calibration register */
  while(ADC_GetResetCalibrationStatus(ADC1));
  /* Start ADC1 calibaration */
  ADC_StartCalibration(ADC1);
  /* Check the end of ADC1 calibration */
  while(ADC_GetCalibrationStatus(ADC1));
 
  /* Enable DMA1 channel1 */
  DMA_Cmd(DMA1_Channel1, ENABLE);
    
  /* Start ADC1 Software Conversion */
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);
 
下面是配置的中断，因PA4下拉引起一直中断
void SW_Init(void)
{
  EXTI_InitTypeDef  EXTI_InitStructure;
 GPIO_InitTypeDef GPIO_InitStructure;
 NVIC_InitTypeDef NVIC_InitStructure;
 
 /* Enable ADC1 and GPIOC clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
 
 
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PA0中断输入 
 //GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//GPIO_Mode_IPU;//
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
   /* Enable the RTC Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
 
  /*将EXTI线0连接到PA0*/
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);
  /*配置EXTI线0上出现下降沿，则产生中断*/
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
  EXTI_GenerateSWInterrupt(EXTI_Line0);
}

蓝调街口-366393

可能中断处理时间大于7.5周期所致，那样的话中断还没来得及处理完就再次触发采样中断，导致一直中断现象

luweitang

stm32的ADC的DMA模式好像有问题，原先准备用DMA传输，但不行，后来直接用ADC的中断源了