【求助】关于stm32两个通用定时器的问题。。。。。

我是寻水鱼 · 发表于 2017-11-14 15:48:45

本帖最后由我是寻水鱼于 2017-11-14 17:02 编辑

在做一个课题，用到tim3 tim4定时器中断，本意是先是定时器3打开，然后进入中断，当条件满足后，进入定时器4中断，然后在定时器4中断内，当另一条件满足后再次进入定时器3中断，这样循环，为啥3就是进不去4，4也进不去3，每个单独使用都没有问题。求解答。。

1.中断配置
[mw_shl_code=c,true]void NVIC_Configuration()
{
NVIC_InitTypeDef NVIC_InitStructure;

            NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

            NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
            NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
            NVIC_Init(&NVIC_InitStructure);

            NVIC_InitStructure.NVIC_IRQChannel=TIM4_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
            NVIC_InitStructure.NVIC_IRQChannelSubPriority=2;
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
            NVIC_Init(&NVIC_InitStructure);

}[/mw_shl_code]
2. 定时器3， 4 配置

[mw_shl_code=c,true]void time_init()
{
      TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;       //

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

      TIM_ClearITPendingBit(TIM3,TIM_IT_Update);//

      TIM_TimeBaseInitStructure.TIM_Period = 2000;//
      TIM_TimeBaseInitStructure.TIM_Prescaler = 35999;//
      TIM_TimeBaseInitStructure.TIM_ClockDivision = 0; //
      TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;//
      TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);
      TIM_Cmd(TIM3,ENABLE); //

      TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE );       //

}[/mw_shl_code]

[mw_shl_code=c,true]void time_init4()
{
      TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;       //éùÃ÷ò»¸ö½á11ìå±äá¿￡¬óÃà′3õê¼»ˉGPIO

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);

      TIM_ClearITPendingBit(TIM4,TIM_IT_Update);

      TIM_TimeBaseInitStructure.TIM_Period = 2000;
      TIM_TimeBaseInitStructure.TIM_Prescaler = 35999;
      TIM_TimeBaseInitStructure.TIM_ClockDivision = 0;
      TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM4,&TIM_TimeBaseInitStructure);
      TIM_Cmd(TIM4,ENABLE);

      TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE );       //ê1Äü»òÕßê§ÄüÖ¸¶¨μÄTIMÖD¶Ï

}[/mw_shl_code]

3.定时器3中断函数
[mw_shl_code=c,true]void TIM3_IRQHandler()       //
{
      static u16 showw1,showw2;
      static u32 i1=0;
      static u8 a,b,c,d,e,f,g;
      static u8 temp1[20];
      TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
      i1++;
      if(i1%10==0)

               showw2=a*100+b*10+c;
               if(showw1>=showw2)//
                     {
                        TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
                              TIM_Cmd(TIM3,DISABLE);//关闭定时器3
                        delay_ms(20);
                              time_init4();;//定时器4初始化

                     }
      }
      else if(i1==1)
      {

         sprintf((char*)temp1,"%d",showw1);
                     display_GB2312_string(149,1,temp1);

      }
}[/mw_shl_code]

4.定时器4中断函数
[mw_shl_code=c,true]void TIM4_IRQHandler()       //
{
      static u32 showw1,showw2,showw3,aa,bb,cc;
      static u32 i1=0;
      static u8 a,b,c,d,e,f,g,p,q;
      static u8 temp1[20],temp2[20];
      TIM_ClearITPendingBit(TIM4,TIM_IT_Update);

      showw1=i1++;

      showw2=a*100+b*10+c;
      showw3=p*10+q;
      if(showw3==2)       //
      {
                     if(showw1==(2*showw2))//
                     {
                        TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
                              TIM_Cmd(TIM4,DISABLE);//关闭定时器4
                              GPIO_SetBits(GPIOB,GPIO_Pin_11); //PB11à-¸ß
                              delayms(1000);
      delay_ms(20);
                              clear_screen();//½øèë×Ô¶ˉ1yÂË½çÃæ
                              zidongmoshixianshi11();
                              TIM_Cmd(TIM3,ENABLE);//打开定时器3
                              zidongmoshiyunxing1();
                     }
                     else if(showw1>=showw2&&showw1<(2*showw2))/
                     {
                              aa=showw1-showw2;
                              sprintf((char*)temp2,"%2d",aa);
            display_GB2312_string(149,1,temp2);
                              display_GB2312_string(144,7,"2");//
                              GPIO_SetBits(GPIOB,GPIO_Pin_10);
                              GPIO_ResetBits(GPIOB,GPIO_Pin_11);
                     }
                     else if(showw1>=0&&showw1<showw2)//
                     {

                              sprintf((char*)temp1,"%2d",showw1);
            display_GB2312_string(149,1,temp1);
                              display_GB2312_string(144,7,"1");//
                              GPIO_ResetBits(GPIOB,GPIO_Pin_10); /
                     }

  }[/mw_shl_code]