定时器TIM5进不了中断问题

Lure白 · 发表于 2021-7-7 14:03:04

我用F107的板子，准备每隔0.5进一次定时器中断，可是发现程序没有进中断，我用LED能否点亮来判断有没有进中断，结果灯不亮，我检查我的配置，也没发现什么问题，请大神帮我看看，分析分析，感谢！！！
//定时器5初始化
//定时0.5s,每0.5s进一次定时中断
void TIM5_Enable(u16 arr)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE);
TIM_TimeBaseStructure.TIM_ClockDivision=0;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period=arr;//arr=4999
TIM_TimeBaseStructure.TIM_Prescaler=7199;
TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
TIM_TimeBaseInit(TIM5,&TIM_TimeBaseStructure);

NVIC_InitStructure.NVIC_IRQChannel=TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;
NVIC_Init(&NVIC_InitStructure);
TIM_ClearITPendingBit(TIM5,TIM_IT_Update);
TIM_ITConfig(TIM5,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM5,ENABLE);
}

void TIM5_IRQHanler(void)//TIM5中断
{
if(TIM_GetITStatus(TIM5,TIM_IT_Update)==SET) //检查指定的TIM中断发生与否:TIM 中断源
{
TIM_ClearITPendingBit(TIM5,TIM_IT_Update);//清除TIMx的中断待处理位:TIM 中断源 ;
if(TX_RX_SET==0)
{
   LED_RUN=1;
        printf("1111/r/n");
   RS485_SendData();
   }
}
}