timer输入捕获测频率，偶尔会得到真实值的一半

tvrgt · 发表于 2020-9-6 17:10:35

用了定时器的输入捕获功能来测得频率，有两个中断，上升沿中断和溢出中断，第一次溢出后开始取数，用上这次上升沿的数值减去一次上升沿的数值得出信号源频率值，第二次计数器溢出后关闭中断和定时器。现在偶尔会出现捕获值翻倍，好像漏掉了一次上升沿一样，我开启了捕获溢出判断也并没有进入贴一下中断服务函数
void TIMER2_IRQHandler(void)
{
         if(SET == timer_interrupt_flag_get(TIMER2,TIMER_INT_UP))
               {
                     timer_interrupt_flag_clear(TIMER2,TIMER_INT_UP);
                     timer2_counter_overflow++;
   timer2_interrupt_clear();
                     update_flag++;
               if(timer2_counter_overflow==2)
                     {
                     timer2_interrupt_disable(); //double time capture,????????g???????2.????????
               timer_disable(TIMER2);
                     timer2_counter_overflow=0;
   timer2_interrupt_clear();
               }
               }

if(SET == timer_interrupt_flag_get(TIMER2,TIMER_INT_CH0))
{
      /* clear channel 0 interrupt bit */
      timer_interrupt_flag_clear(TIMER2,TIMER_INT_CH0);
/* !!!!!!!!!! */interrupt_flag1++; /* !!!!!!!!!!!!!! */
         /* read channel 0 capture value */
      /* read channel 0 capture value */
                     if((timer2_counter_overflow==1) && (RESET == timer_flag_get(TIMER2,TIMER_INTF_CH0OF)))//wu yi chu
                              {
      if(0 == ccnumber0)
      {
      CH0_CAPTURE_OLD = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_0)+1;
      ccnumber0 = 1;
      }
      else if(1 == ccnumber0)
      {
      CH0_CAPTURE_NEW = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_0)+1;
      if(CH0_CAPTURE_NEW > CH0_CAPTURE_OLD)
      {
      ic1value = CH0_CAPTURE_NEW - CH0_CAPTURE_OLD;
      }
      else{
                                             ic1value = ((0xFFFF - CH0_CAPTURE_OLD) + CH0_CAPTURE_NEW);
                                             }
                                             fre_highcapture_1= 10000000/ ic1value;
/* !!!!!!!!!! */fre_highcapture_1_OLD=fre_highcapture_1;
         if(fre_highcapture_1<9980)
         {
/* !!!!!!!!!! */int_CH0_flag=1;  /* !!!!!!!!!!!!!!!!! */
         }
         if(fre_highcapture_1>10012)
         {
/* !!!!!!!!!! */int_CH0_flag=1;  /* !!!!!!!!!!!!!!!!! */
         }
            int_CH0_flag=1;
            ccnumber0 = 0;
      }
      }

               if((timer2_counter_overflow==1) &&(SET == timer_flag_get(TIMER2,TIMER_INTF_CH0OF)))//you yi chu
               {
                        timer_flag_clear(TIMER2,TIMER_INTF_CH0OF);
/* !!!!!!!!!! */fre_highcapture_1=fre_highcapture_1_OLD;
/* !!!!!!!!!! */timer2_interrupt_disable();  /* !!!!!!!!!! */
/* !!!!!!!!!! */timer_disable(TIMER2);    /* !!!!!!!!!!!!!!! */
                        int_CH0_flag=1;
                        ccnumber0 = 0;
               }
   }
if(SET == timer_interrupt_flag_get(TIMER2,TIMER_INT_CH1))
                     {
      /* clear channel 0 interrupt bit */
      timer_interrupt_flag_clear(TIMER2,TIMER_INT_CH1);
/* !!!!!!!!!! */ interrupt_flag2++; /* !!!!!!!!!!!! */
      /* read channel 0 capture value */
                     if((timer2_counter_overflow==1) && (RESET == timer_flag_get(TIMER2,TIMER_INTF_CH1OF)))
                              {
      if(0 == ccnumber1)
      {
      CH1_CAPTURE_OLD = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_1)+1;
      ccnumber1 = 1;
      }
      else if(1 == ccnumber1)
      {
      CH1_CAPTURE_NEW = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_1)+1;
      if(CH1_CAPTURE_NEW > CH1_CAPTURE_OLD)
         {
                     ic2value = CH1_CAPTURE_NEW - CH1_CAPTURE_OLD;
         }
   else{
      ic2value = ((0xFFFF - CH1_CAPTURE_OLD) + CH1_CAPTURE_NEW);
         }
         fre_highcapture_2= 10000000/ ic2value;
/* !!!!!!!!!! */fre_highcapture_2_OLD=fre_highcapture_2;
         if(fre_highcapture_2<9980)
         {
/* !!!!!!!!!! */int_CH1_flag=1;  /* !!!!!!!!!!!!!!!!! */
         }
         if(fre_highcapture_2>10012)
         {
/* !!!!!!!!!! */int_CH1_flag=1;  /* !!!!!!!!!!!!!!!!! */
         }
         int_CH1_flag=1;
         ccnumber1 = 0;
      }
   }

               if((timer2_counter_overflow==1) &&(SET == timer_flag_get(TIMER2,TIMER_INTF_CH1OF)))
         {
                  timer_flag_clear(TIMER2,TIMER_INTF_CH1OF);
                  fre_highcapture_2=fre_highcapture_2_OLD;
/* !!!!!!!!!! */timer2_interrupt_disable();  /* !!!!!!!!!! */
/* !!!!!!!!!! */timer_disable(TIMER2);    /* !!!!!!!!!!!!!!! */
                  int_CH1_flag=1;
                  ccnumber1 = 0;
         }
}
if(SET == timer_interrupt_flag_get(TIMER2,TIMER_INT_CH2))
{
      /* clear channel 0 interrupt bit */
   timer_interrupt_flag_clear(TIMER2,TIMER_INT_CH2);
/* !!!!!!!!!! */ interrupt_flag3++;/* !!!!!!!!!! */
                     if((timer2_counter_overflow==1) && (RESET == timer_flag_get(TIMER2,TIMER_INTF_CH2OF)))
                     {
      if(0 == ccnumber2)
      {
      CH2_CAPTURE_OLD = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_2)+1;
      ccnumber2 = 1;
      }
      else if(1 == ccnumber2)
      {
      CH2_CAPTURE_NEW = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_2)+1;
      if(CH2_CAPTURE_NEW > CH2_CAPTURE_OLD)
      {
                  ic3value = CH2_CAPTURE_NEW - CH2_CAPTURE_OLD;
      }
                  else
      {
                        ic3value = ((0xFFFF - CH2_CAPTURE_OLD) + CH2_CAPTURE_NEW);
                              }
                              fre_highcapture_3= 10000000/ ic3value;
                              if(fre_highcapture_3<9980)
                              {
/* !!!!!!!!!! */int_CH2_flag=1;  /* !!!!!!!!!!!!!!!!! */
                              }
                              if(fre_highcapture_3>10012)
                              {
/* !!!!!!!!!! */int_CH2_flag=1;  /* !!!!!!!!!!!!!!!!! */
                              }
                              int_CH2_flag=1;
                              ccnumber2 = 0;
   }
   }
            if((timer2_counter_overflow==1) && (SET == timer_flag_get(TIMER2,TIMER_INTF_CH2OF)))
               {
                     timer_flag_clear(TIMER2,TIMER_INTF_CH2OF);
/* !!!!!!!!!! */fre_highcapture_3=fre_highcapture_3_OLD;
/* !!!!!!!!!! */timer2_interrupt_disable();  /* !!!!!!!!!! */
/* !!!!!!!!!! */timer_disable(TIMER2);    /* !!!!!!!!!!!!!!! */
                     int_CH2_flag=1;
                     ccnumber2 = 0;
               }

}
if(SET == timer_interrupt_flag_get(TIMER2,TIMER_INT_CH3))
{
      /* clear channel 0 interrupt bit */
      timer_interrupt_flag_clear(TIMER2,TIMER_INT_CH3);
/* !!!!!!!!!! */interrupt_flag4++;/* !!!!!!!!!! */
                     if((timer2_counter_overflow==1) && (RESET == timer_flag_get(TIMER2,TIMER_INTF_CH3OF)))
                     {
      if(0 == ccnumber3)
      {
      CH3_CAPTURE_OLD = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_3)+1;
      ccnumber3 = 1;
      }
      else if(1 == ccnumber3)
      {
      CH3_CAPTURE_NEW = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_3)+1;
      if(CH3_CAPTURE_NEW > CH3_CAPTURE_OLD)
         {
                     ic4value = CH3_CAPTURE_NEW - CH3_CAPTURE_OLD;
         }
      else{
         ic4value = ((0xFFFF - CH3_CAPTURE_OLD) + CH3_CAPTURE_NEW);
         }
      fre_highcapture_4 = 10000000/ ic4value;
/* !!!!!!!!!! */fre_highcapture_4_OLD=fre_highcapture_4;
         if(fre_highcapture_4<9980)
         {
/* !!!!!!!!!! */int_CH3_flag=1;  /* !!!!!!!!!!!!!!!!! */
         }
         if(fre_highcapture_4>10012)
         {
/* !!!!!!!!!! */int_CH3_flag=1;  /* !!!!!!!!!!!!!!!!! */
         }
         int_CH3_flag=1;
         ccnumber3 = 0;
      }
   }

               if((timer2_counter_overflow==1) && (SET == timer_flag_get(TIMER2,TIMER_INTF_CH3OF)))
               {
                     timer_flag_clear(TIMER2,TIMER_INTF_CH3OF);
/* !!!!!!!!!! */fre_highcapture_4=fre_highcapture_4_OLD;/* !!!!!!!!!! */
/* !!!!!!!!!! */timer2_interrupt_disable();  /* !!!!!!!!!! */
/* !!!!!!!!!! */timer_disable(TIMER2);    /* !!!!!!!!!!!!!!! */
                     int_CH3_flag=1;
                     ccnumber3 = 0;
               }
}
}

[经验] timer输入捕获测频率，偶尔会得到真实值的一半

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