STM32中TIM定时器中断的一个细节问题记录

今天调试的时候发现,当使用TIM定时器作为计时器使用的时候,TIM定时器的中断服务函数第一次执行,是在TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE );语句后就开始执行的,而不是到达第一个计数周期的时候。

这对仅利用一次定时器的程序有一定影响。

 

void TIM4_Int_Init(u16 period,void (*__TIM4_IRQHandler_Inside__)(void))
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    RCC_ClocksTypeDef RCC_ClocksStatus;
    uint16_t prescaler;         
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); 
    RCC_GetClocksFreq(&RCC_ClocksStatus);
    prescaler = RCC_ClocksStatus.SYSCLK_Frequency / 1000000 ;       
    TIM_TimeBaseStructure.TIM_Period = period-1;                                    //ÉèÖÃÔÚÏÂÒ»¸ö¸üÐÂʼþ×°Èë»î¶¯µÄ×Ô¶¯ÖØ×°ÔؼĴæÆ÷ÖÜÆÚµÄÖµ     ¼ÆÊýµ½5000Ϊ5000ms
    TIM_TimeBaseStructure.TIM_Prescaler =(prescaler*1000)-1;            //ÏÖÔÚÿ´Î+1ÊÇ1ms 32000·ÖƵ  32000000/32000=1000 ÿÃëÖÓ¸üÐÂ1000´Î£¬Ã¿´Î¸üÐÂÊÇ1ms
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;                                    //ÉèÖÃʱÖÓ·Ö¸î:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;     
    TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);                             //¸ù¾ÝTIM_TimeBaseInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯TIMxµÄʱ¼ä»ùÊýµ¥Î»
print_d("1\n");
    TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE ); 
    
    NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;  
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;  
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
    NVIC_Init(&NVIC_InitStructure);  
print_d("2\n");
    TIM4_IRQHandler_Inside=__TIM4_IRQHandler_Inside__;
    TIM_Cmd(TIM4, ENABLE); 
print_d("3\n");
    EXTIstatus.Tim4IsUsing=1;
    print_d("TIM4 init finished\n");
}

串口调试输出:

1

进入中断

2

3

TIM4 init finished

 

要解决这个问题,可以在TIM4_Int_Init最后改变一个isFinished标志位,在中断服务函数里面检查标志位。这样就可以丢弃掉那个无用的初始化中断。

 

 

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    The president dealing with Assad reminds me of a story: Once upon a time, there was a man taking a walk in the forest. He came upon a wounded snake. He picked the snake up, took him home, nursed him back to health. He loved the snake, talked to it, cuddled it, fed it and nurtured it. The snake (although deadly) became a part of his family. One day, when giving his pet snake food, it bit him. As the man was dying, he asked: “Why did you do that? I saved your life, I brought you into my home, I loved you and treated you like family!” The snake replied: “Because I’m a snake. I always have been and I always will be.” Assad’s a snake. The president just needs to find the best way to deal with his snake’s venom.

  81. Norris

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    But after last season became so unwatchable, when you watched the deconstruction of Sanchez and nearly saw Rex Ryan fire himself, the Jets really are interesting again, and not just for being clowns.

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