STM32F4定时器5 异常进不去中断问题

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STM32F4定时器5 中断异常进不去问题

出现问题现象：
用定时器5来发脉冲，有时候当指令发送后，定时器不发脉冲，debug时发现程序执行到打开定时器5后，进不去中断，之后就一直进不去中断，才导致发不了脉冲。

定时器5配置代码如下：
void TIM5_PWM_Init(u32 arr,u32 psc)
{
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE);          //TIM5时钟使能    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);         //使能PORTF时钟        GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_TIM5); //GPIOA3复用为定时5GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;           //GPIOA3GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;        //复用功能GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;        //速度100MHzGPIO_InitStructure.GPIO_OType = GPIO_OType_PP;      //推挽复用输出GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;        //上拉GPIO_Init(GPIOA,&GPIO_InitStructure);              //初始化PA3TIM_TimeBaseStructure.TIM_Prescaler=psc;  //定时器分频TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式TIM_TimeBaseStructure.TIM_Period=arr;   //自动重装载值TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;         TIM_TimeBaseInit(TIM5,&TIM_TimeBaseStructure);//初始化定时5

//初始化TIM5 Channe4 PWM模式
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_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低
TIM_OCInitStructure.TIM_Pulse = arr/2;//arr+1;
TIM_OC4Init(TIM5, &TIM_OCInitStructure); //根据T指定的参数初始化外设
TIM_OC4PreloadConfig(TIM5, TIM_OCPreload_Enable); //使能TIM5在CCR4上的预装载寄存器

TIM5->CNT = 0;TIM_ARRPreloadConfig(TIM5,ENABLE);//ARPE使能 TIM_ClearFlag(TIM5, TIM_FLAG_Update);TIM_ITConfig(TIM5,TIM_IT_Update,ENABLE); //允许定时器5更新中断TIM_ITConfig(TIM5,TIM_IT_CC4,DISABLE); //失能定时器5更新中断TIM_Cmd(TIM5, DISABLE);  //不使能TIM5NVIC_InitStructure.NVIC_IRQChannel=TIM5_IRQn; //定时器5中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00; //抢占优先级1NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01; //子优先级0NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_Init(&NVIC_InitStructure);

}