计数器怎么重置

大家好，我正在制作一个应用程序，它通过Modbus通信到一个设备上，我想检测它们之间是否存在通信丢失，以便激活一个警报。好的，我已经实现了一个带有TMR2的计时器，如果没有20个以上的APROX，就可以激活警报。它可以正常工作，闹钟被激活，但是经过一段时间后，计数器复位，警报被解除，直到另一个20秒的通信丢失。我把代码的碎片留给了我，因为任何人都能告诉我问题是什么，因为我不能用FI。任何感觉…TMR2Y-中断复位到0 TMR2Y计数器，如果我收到任何数据，只有在RXI中断。当计数器复位时，没有RXI中断，我已经证明了。报警管理如果您需要更多信息，不要犹豫问我。希望有人能给我一些启示，因为我疯了…多谢



      以下为原文

    Hi everyone,

I am making an application that communicates by MODBUS to a device and I want to detect if there is a loss of communication between them so as to activate an alARM.
Ok, i have implemented a timer with TMR2 so as to activate the alarm if there are more than 20 seconds aprox without communication.
It works all right, the alarm is activated but after a period of time the counter resets itself and the alarm is desactivated untill another 20s of loss of communication.

I left you the fragment of code where I implement this so as anyone could show me what the problem is because i can´t find any sense....

TMR2_Interrupt

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//+INTERRUPT SERVICE ROUTINE
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//-----------------------------------------------------------------------------
//- HIGH INTERRUPT Addressing -
//-----------------------------------------------------------------------------
#pragma code HighInterruptVector = 0x0008
void HighInterruptVector (void)
{
  _asm
    goto HighInterruptRoutine
  _endasm
}
//-----------------------------------------------------------------------------
//- HIGH INTERRUPT Function -
//-----------------------------------------------------------------------------
#pragma interrupt HighInterruptRoutine

void HighInterruptRoutine (void)
{
if (PIR1bits.TMR2IF)
{
  if (TMR2_Counter <= 1250) //20 seconds
  {
   TMR2_Counter ++;
  }
  PIR1bits.TMR2IF = 0; //CLEAR TMR2 flag
}
}

I reset to 0 the TMR2_Counter if I receive any data, only in the Rx_Interrupt. When the counter resets there is not Rx_Interrupt, I have already proved that.

Alarm managing
if(Alarm1 != 0 | Alarm2 !=0)
{
  if (Alarm1 == 0x0003 & Alarm2 == 0x0000) //Loss of synchronism with the motor Alarm
  {
   alarmCounter = 0; //Reset Alarm counter
   syncAlarmCounter_Aux ++;
   if (syncAlarmCounter_Aux > 32000) //1 second
   {
    syncAlarmCounter_Aux = 0;
    syncAlarmCounter ++;
    if (syncAlarmCounter > 15) //Seconds of Time Out for loss of synchronism alarm
    {
     PORTCbits.RC0 = 0; //Activate Relay if loss of synchronism alarm detected while x period of time (Negative Logic)
     PORTCbits.RC1 = 0;
    }
   }
  }
  else //For any other alarm activate Relay
  {
   alarmCounter_Aux ++;
   syncAlarmCounter = 0; //Reset the loss of synchronism Alarm counter
   if (alarmCounter_Aux > alarmTimeOut_Aux)
   {
    alarmCounter_Aux = 0;
    alarmCounter ++;
    if (alarmCounter > alarmTimeOut)
    {
     PORTCbits.RC0 = 0; //Activate Relay if alarm detected (Negative Logic)
     PORTCbits.RC1 = 0;
    }
   }
  }
  if (TMR2_Counter > 1250) //20s without RS485 communication
  {
   PORTCbits.RC0 = 0; //Activate Relay if alarm detected (Negative Logic)
   PORTCbits.RC1 = 0;
  }
}
else
{
  alarmCounter = 0;
  syncAlarmCounter = 0; //Reset the loss of synchronism Alarm counter
  if (TMR2_Counter > 1250 ) //20s without RS485 communication
  {
   PORTCbits.RC0 = 0; //Activate Relay if alarm detected (Negative Logic)
   PORTCbits.RC1 = 0;
  }
  else
  {
   PORTCbits.RC0 = 1; //Desactivate Relay if no alarm detected
   PORTCbits.RC1 = 1;
  }
}

If you need more info don´t hesitate to ask me. Hope anyone could bring some light to this, because I´m getting mad... Many thanks