PIC12F615 Level Interrupt Debugging Notes

Yesterday, I was debugging a level interruption. I wanted to change the state of the LED on GP4 when GP1 was pressed. The program was done step by step. GP1 enabled weak pull-up and then connected the button to the ground line. However, when debugging on PICKit3, the LED on the PCB did not turn off. I always thought it was a problem with the code, but later I found that the power supply of PICKit3 was insufficient. It became normal after connecting 5V power. If you are afraid of trouble during debugging, you can connect a 1K~4.7K resistor to GP1 to pull it up and it can be used normally.

The relevant program codes are as follows:

unsigned char GPtemp; //level interrupt reading

void DebounceDelay(unsigned char us)

{

    while(us--);

}

void InitGPINT(void) //Level change interrupt See Datasheet page 44

{

    nGPPU=0; //The global GPPU bit must be enabled to enable the individual pull-up function.

    CMCON0=0B00000101;

    TRISIO1=1;

    AN1=0;  

    WPU1=1; //In input mode, internal weak pull-up can be set

    GPtemp=GP1;

    IOC1=1; //Enable level change interrupt        

    GPIF=0;

    GPIE=1;

}

void interrupt ISR(void) //interrupt processing function

{

/*

    if(T0IF) //timing interval 5mS

    {

        T0IF=0;

        MS++;

        PWMDelay++;

        if(MS>=200) //1 second is up.    

        {

           MS=0;

           SEC++;

           if(SEC>59)

           {

               SEC=0;

               MIN++;

           }

        }

        TMR0=T0Value; //Reassign value and enter the next cycle

    }

  */  

    if(GPIF) //level interrupt

    { 

        GPIE=0;

        GPtemp=GP1;

        DebounceDelay(255); //Debounce delay   

        if(GP1==0)

        {

            GP4=!GP4;

        }

        GPIF=0; 

        GPIE=1;

    }

    GIE=1; // Enable general interrupt

}

void main(void) 

{

    InitMCU();

    InitSW();

    InitGPINT();

    InitPWM();

    InitAD();

    InitT0();

//PEIE=1;

    GIE=1;

    while(1)

    {

        LEDBreathe();

    }

    return;

}