stm32f106定时器中断问题

liyangjian1127

请教大神，我使用tim3扫描串口。出现了间隔一段时间就出现只接收串口一个字节就结束的情况，更改定时器时间无作用。
//ʹÄܶ¨Ê±Æ÷4,ʹÄÜÖжÏ.
void Timer4_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //TIM4ʱÖÓʹÄÜ

  //TIM4³õʼ»¯ÉèÖÃ
  TIM_TimeBaseStructure.TIM_Period = arr; //ÉèÖÃÔÚÏÂÒ»¸ö¸üÐÂʼþ×°Èë»î¶¯µÄ×Ô¶¯ÖØ×°ÔؼĴæÆ÷ÖÜÆÚµÄÖµ   ¼ÆÊýµ½5000Ϊ500ms
  TIM_TimeBaseStructure.TIM_Prescaler =psc; //ÉèÖÃÓÃÀ´×÷ΪTIMxʱÖÓƵÂʳýÊýµÄÔ¤·ÖƵֵ  10KhzµÄ¼ÆÊýƵÂÊ  
  TIM_TimeBaseStructure.TIM_ClockDivision = 0; //ÉèÖÃʱÖÓ·Ö¸î:TDTS = Tck_tim
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòÉϼÆÊýģʽ
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //¸ù¾ÝTIM_TimeBaseInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯TIMxµÄʱ¼ä»ùÊýµ¥Î»

  TIM_ITConfig( TIM4, TIM_IT_Update|TIM_IT_Trigger, ENABLE );//TIM4 ÔÊÐí¸üУ¬´¥·¢ÖжÏ
  //TIM4ÖжϷÖ×éÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;  //TIM3ÖжÏ
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;  //ÏÈÕ¼ÓÅÏȼ¶03¼¶
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //´ÓÓÅÏȼ¶3¼¶
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQͨµÀ±»Ê¹ÄÜ
  NVIC_Init(&NVIC_InitStructure);  //¸ù¾ÝNVIC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèNVIC¼Ä´æÆ÷
   TIM_Cmd(TIM4, ENABLE);  //ʹÄÜTIM4   
}
//¶¨Ê±Æ÷4·þÎñÖжϳÌÐò
void TIM4_IRQHandler(void)
{                        
  if(TIM4->SR&0X0001)
  {
    read_usart1();
    TIM4->CNT=0;   
    TIM4->ARR=1000;   
  }           
  TIM4->SR&=~(1<<0);   
}

原子哥

改为贴代码吧，