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TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;            //重复计数，一定要=0！！！

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TIM_CtrlPWMOutputs(TIM1, ENABLE);   //高级定时器一定要加上，主输出使能

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/***定时器1主模式***/
void TIM1_config(u32 Cycle)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_TIM1 , ENABLE); 

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;                   //TIM1_CH4 PA11
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;             //复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = Cycle-1;                                                   
    TIM_TimeBaseStructure.TIM_Prescaler =71;                    //设置用来作为TIMx时钟频率除数的预分频值                                                     
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;     //设置时钟分割：TDTS= Tck_tim            
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;            //重复计数，一定要=0！！！
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);                                       

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;          //选择定时器模式：TIM脉冲宽度调制模式1       
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
    TIM_OCInitStructure.TIM_Pulse = Cycle/2-1;                    //设置待装入捕获寄存器的脉冲值                                   
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;      //输出极性       

    TIM_OC4Init(TIM1, &TIM_OCInitStructure);                                                         

    TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
    TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update);
    

    TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);                              
    TIM_ARRPreloadConfig(TIM1, ENABLE);                                                          
}
/***定时器4从模式***/
void TIM4_config(u32 PulseNum)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure; 
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = PulseNum-1;   
    TIM_TimeBaseStructure.TIM_Prescaler =0;    
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;     
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
    TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);  

    TIM_SelectInputTrigger(TIM4, TIM_TS_ITR0);
    //TIM_InternalClockConfig(TIM4);
    TIM4->SMCR|=0x07;                                  //设置从模式寄存器 
    //TIM_ITRxExternalClockConfig(TIM4, TIM_TS_ITR0);

    //TIM_ARRPreloadConfig(TIM4, ENABLE);         
    TIM_ITConfig(TIM4,TIM_IT_Update,DISABLE);

   // NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);
    NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;        
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;     
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
    NVIC_Init(&NVIC_InitStructure);
}
void Pulse_output(u32 Cycle,u32 PulseNum)
{
    TIM4_config(PulseNum);
    TIM_Cmd(TIM4, ENABLE);
    TIM_ClearITPendingBit(TIM4,TIM_IT_Update);
    TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
    TIM1_config(Cycle);
    
    TIM_Cmd(TIM1, ENABLE);
    TIM_CtrlPWMOutputs(TIM1, ENABLE);   //高级定时器一定要加上，主输出使能
}


void TIM4_IRQHandler(void) 
{ 
    if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)     // TIM_IT_CC1
    { 
        TIM_ClearITPendingBit(TIM4, TIM_IT_Update); // 清除中断标志位 
        TIM_CtrlPWMOutputs(TIM1, DISABLE);  //主输出使能
        TIM_Cmd(TIM1, DISABLE); // 关闭定时器 
        TIM_Cmd(TIM4, DISABLE); // 关闭定时器 
        TIM_ITConfig(TIM4, TIM_IT_Update, DISABLE); 
        
    } 
}

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#include "delay.h"
#include "sys.h"
#include "timer.h"
 

 int main(void)
 {      
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 
    delay_init();            //延时函数初始化    
    uart_init(115200);   //串口初始化为115200
    Pulse_output(1000,8000);//1KHZ，8000个脉冲
    while(1)
    {
    }     
}