目前是实现了所需功能但是有点小问题，一直想不明白（下面的红字部分）

void timer1_init(void)
{
        TIM_TimeBaseInitTypeDef   TIM_TimeBaseStructure;
        TIM_OCInitTypeDef         TIM_OCInitStructure;

  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Period = 800-1;   // 这个地方设置成小于100之后  dma中断就进不去 不知道为什么     
  TIM_TimeBaseStructure.TIM_Prescaler = 9-1;   //   
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;   
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  /* TIM1 channel1 configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;               
  TIM_OCInitStructure.TIM_Pulse = 0x10;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;         
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
       
}

顺带问一下如何检查触发时间，感觉设置的定时器值和实际的值不太一样

附上所有的初始化
void  Adc_Init(void)
{        
        ADC_InitTypeDef ADC_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

       
       
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1        , ENABLE ); //ê1Äüadc1ê±Öó
       
        RCC_ADCCLKConfig(RCC_PCLK2_Div6);   //éèÖÃADC·ÖÆμòò×ó6 72M/6=12,ADC×î′óê±¼ä2»Äü3¬1y14M


        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;               
        GPIO_Init(GPIOA, &GPIO_InitStructure);       
       
        ADC_DeInit(ADC1);  //¸′λADC1,½«íaéè ADC1 μÄè«2¿¼Ä′æÆ÷ÖØéèÎaè±ê¡Öμ

        ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  /* ADC1 regular channel14 configuration */
  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_1Cycles5);
  /* Set injected sequencer length */
  ADC_InjectedSequencerLengthConfig(ADC1, 1);
       
  /* Enable automatic injected conversion start after regular one */
  ADC_AutoInjectedConvCmd(ADC1, ENABLE);

  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);

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

////  /* Enable JEOC interrupt */
////  ADC_ITConfig(ADC1, ADC_IT_JEOC, 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));

}                               

//ADC_DMA初始化
void ADC_DMA_Config(void)
{
  DMA_InitTypeDef DMA_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr =  (uint32_t)&ADC_RegularConvertedValueTab;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 16;
  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 DMA1 channel1 */
  DMA_Cmd(DMA1_Channel1, ENABLE);

  DMA_ITConfig(DMA1_Channel1,DMA_IT_TC, ENABLE);       

//  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
//  NVIC_InitStructure.NVIC_IRQChannel =DMA1_Channel1_IRQn;  
//  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
//  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
//  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//  NVIC_Init(&NVIC_InitStructure);

}

void Adc_gpio_init(void)
{
       
        GPIO_InitTypeDef GPIO_InitStructure;
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1        , ENABLE );         

       
                           
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;               
        GPIO_Init(GPIOA, &GPIO_InitStructure);       

}

void  DMA1_Channel1_IRQHandler(void)
{
   if(DMA_GetITStatus(DMA1_IT_TC1)!=RESET)
   {
                          
                 DMA_ClearITPendingBit(DMA1_IT_TC1);
         }
}