研究了好一段时间了，多次产生1000个脉冲的时候，会出现1001和1003等脉冲，感觉是两个定时器级联，存在一定的时间延迟，拜托那位兄弟，搞过，解惑一下！








void NVIC_Config(void)
{
   NVIC_InitTypeDef NVIC_InitStructure;
   NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;                               
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
         NVIC_Init(&NVIC_InitStructure);
}

void GPIO_Config(void)
{
   GPIO_InitTypeDef GPIO_InitStructure;
         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3, ENABLE);
         //PA1
   GPIO_PinAFConfig(GPIOA,GPIO_PinSource0,GPIO_AF_TIM2);
         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;           
         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;      
         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;       
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;      
         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;        
   GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void TIM2_Master__TIM3_Slave_Configuration(u32 PulseFrequency)
{
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
        TIM_OCInitTypeDef TIM_OCInitStructure;
       
        u16 nPDTemp ;

        TIM_Cmd(TIM2, DISABLE);
        nPDTemp = 168000UL/PulseFrequency;                            // ¸ü¸ÄÆμÂêê±￡¬×￠òa′|àí72000UL¼°TIM_Prescaler￡¬ê1TIM_Period2»òa3¬1y0xFFFF
       
        // ê±»ùÅäÖÃ￡oÅäÖ&#195WMêä3ö¶¨ê±Æ÷¡a¡aTIM2
        /* Time base configuration */
        TIM_TimeBaseStructure.TIM_Period = nPDTemp-1;
        TIM_TimeBaseStructure.TIM_Prescaler = 999;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
        TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
       
        // êä3öÅäÖÃ￡oÅäÖ&#195WMêä3ö¶¨ê±Æ÷¡a¡aTIM2
        /* PWM1 Mode configuration: Channel1 */   
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_Pulse = nPDTemp>>1;//50%
        TIM_OC1Init(TIM2, &TIM_OCInitStructure);
        TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
        TIM_ARRPreloadConfig(TIM2, ENABLE);

       
        // ê±»ùÅäÖÃ￡oÅäÖÃÂö3å¼Æêy¼Ä′æÆ÷¡a¡aTIM3
        TIM_TimeBaseStructure.TIM_Period = 0xFFFF;                      
        TIM_TimeBaseStructure.TIM_Prescaler = 0;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
        TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
       
        // Output Compare Active Mode configuration: Channel1
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Inactive;
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_Pulse = 0xFFFF; // ÕaàïμÄÅäÖÃÖμòaòå2»′ó   
        TIM_OC1Init(TIM3, &TIM_OCInitStructure);
       

        // ÅäÖÃTIM2ÎaÖ÷¶¨ê±Æ÷
        // Select the Master Slave Mode
        TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable); //Ö÷Ä￡ê½
        // Master Mode selection  
        TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update); //¸üDÂê¼t′￥·￠
       
        // ÅäÖÃTIM3Îa′ó¶¨ê±Æ÷
        // Slave Mode selection: TIM3
        TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Gated);     //′óÄ￡ê½
        TIM_SelectInputTrigger(TIM3, TIM_TS_ITR1);          //TIMÄú2¿′￥·￠1
        TIM_ITRxExternalClockConfig(TIM3, TIM_TS_ITR1);     //éèÖÃTIMÄú2¿′￥·￠Îaía2¿ê±ÖóÄ￡ê½
//        TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);                           
       
        TIM_Cmd(TIM2, DISABLE);
        TIM_Cmd(TIM3, DISABLE);

}

void Frequence_Setting(u32 PulseFrequency)
{
        u16 nPDTemp ;

        TIM_Cmd(TIM2, DISABLE);
        nPDTemp = 168000UL/PulseFrequency;

        TIM_SetAutoreload(TIM2,nPDTemp);
        TIM_GenerateEvent(TIM2,TIM_EventSource_Update);
        TIM_SetCompare1(TIM2,nPDTemp/2);
}

void Output_Pulse(u16 Num)
{
    TIM3->CCR1 = Num;
    TIM3->CNT = 0;
    TIM_Cmd(TIM3, ENABLE);
    TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
    TIM_Cmd(TIM2, ENABLE);
  //  TIM2_Pulse_TIM3_Counter_OK = 1;

}
void TIM3_IRQHandler(void)
{
        if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)            // TIM_IT_CC1
        {
                TIM_ClearITPendingBit(TIM3, TIM_IT_CC1); // Çå3yÖD¶Ï±ê־λ
                TIM_Cmd(TIM2, DISABLE); // 1رն¨ê±Æ÷
                TIM_Cmd(TIM3, DISABLE); // 1رն¨ê±Æ÷
                TIM_ITConfig(TIM3, TIM_IT_CC1, DISABLE);
                TIM2_Pulse_TIM3_Counter_OK = 1;
        }
}