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[SOLVED] Interrupt On Change and Delay Loop problem

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speedEC

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Dear All,

I have a problem to read Interrupt On Change while the device in software delay loop (using "for loop"). First, if I found any change in RB4-RB7 (IOC) pins, GREEN LED will be ON. if interrupt RB0 (INT0) occurred While GREEN LED is in ON Status, then ON another RED LED for 5 minutes and OFF the RED LED after 5 minutes. I have used "for loop" for 5 minutes delay. If any change in RB0 -RB7 found, while RED LED is in ON Status (in for loop), I have to come out from the "for loop" and OFF the Red LED. How can do that? I have tried but failed. I could not able to OFF the RED LED. Should I use tiimer instead of "for loop"?

thanks
pmk
 

good problem.... don't worry I'll give you a great trick..

>> first define a global variable..

ex : int n =0;

>> Then add a if statementin the for loop in the RB0 interrupt..
ex:
if(INTF==1){ //RB0 interrupt occurred
for(i = 0; i < max;i++){
if(n==1) i=max; //when n=1 loop will be stop
//rest
}
}

>> Then upadate variable n to 1 when RB4-RB7 was occurred..

ex:

if(RBIF==1){ //if RB4-7 interrupt was occurred, n will change to 1
n=1;
}

Result:

when RB4-7 interrupt was occurred n will be 1 and then for loop in RB0 interrupt will be end.

that's all... :grin:
 
Last edited:
Thanks smeety. I have tried. But didn't work. Because, if INT0 occurred then goes into loop (for 5 min). So, while in loop, it didn't respond to Int on change interrupt.

thanks
pmk
 

I'll add some changes to Smeety's reply, It'll solve your problem..

don't use a variable to control the loop, just check RB4-7 value in the loop..

if(INTF==1){ //RB0 interrupt occurred

x = <RB4-7 value>

for(i = 0; i < max;i++){
y= <RB4-7 value>
if(x!=y) i=max; //when <RB4-7 value> changed, loop will be stop
//rest
}
}

this will be work..! good luck.. :razz:
 
Thanks ajex. Actually, I want to lights-up RED LED continuously only for 5 minutes. In between the 5 minutes delay, If interrupt occurred on RB0-RB7, then RED LED should be OFF. In your reference code, the RED LED lights-up continuously until interrupt occurred on RB0-RB7. Am I right? If I wrong pl update me.

Thanks
pmk
 

Thanks smeety and ajax,

As you told, I have modified code as follows. Now its work fine as that I was expected. Great Thanks to both of you for help you provided.

Code C - [expand]
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void ALARM_ON(void){
    T1CON=0b00000001;
    count = mSecDelay;  // Reset Counter
    while (1){
        while (! TMR1IF);
        TMR1IF = 0;
        if (RBIF){
            RBIF = 0;
            n = 1;
            count = mSecDelay;  // Reset Counter
            ALARM = 0;  // OFF the Alarm
            TMR1IF = 0; // Clear Timer Flag
            TMR1IE = 0; //disable timer1
          break;
        }
        count--;
        if (count == 0){
            count = mSecDelay;  // Reset Counter
            ALARM = 0;  // OFF the Alarm
            TMR1IF = 0; // Clear Timer Flag
            TMR1IE = 0; //disable timer1
          break;
        }
    }
}
main(){
while(1){
        if (RBIE && RBIF){   // If IOC (RB4-RB7) occurred or Timer1
            delay_ms(10);   // To find Switch Debounce
            if(RB4 == 1){
                if (n == 1){
                    n = 0;
                    mismatch_Clr = PORTB;
                    RBIF = 0;
                    RBIE = 1;
                  break;
                }
                if(LED == 1){
                   LED = 0;
                   beep_Off();
                }
                else{
                    LED = 1;
                    beep_On();
                    delay_ms(300);
                    
                    beep_On();
                }
            }
        mismatch_Clr = PORTB;
        RBIF = 0;
        RBIE = 1;
        }
        
        if (INTE && INTF) { // If interrupt INT0 occurred
            delay_ms(10);
            if(RB0 == 0){
                if (LED == 1){
                    LED = 0;    // GREEN LED OFF
                    ALARM = 1;  // ON ALARM
                    ALARM_ON();
                }
            }
        INTF = 0;
        INTE = 1;
        }
    }
}


thanks
pmk
 

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