Interrupt priorities

[Hayee]

Hi
I am working on interrupts and without settings the priorities of interrupts the code is working fine. following is the code without defining priority of TIMER3 interrupt.

void __interrupt() ISR(void){
    //===Timer3 Interrupt Routine============================================//
    /*
     * Timer3 is used to create a 1 Sec delay.
     * This 1 Sec delay can be used by different tasks.
     */
    if(PIR2bits.TMR3IF){
        _1sec++;
        
        if(_1sec == 10)
        {
            RED_LED = !RED_LED;    // Toggle LED after every sec
            if(backlight_timeout) backlight_timeout--;
            if(serial_timeout) serial_timeout--;
            _1sec = 0;
        }
        
        PIR2bits.TMR3IF = 0;
        TMR3H = 0x3C;
        TMR3L = 0xB0;
    }
}

but when i assign low priority to the interrupt it does not works, I also defined the IP flag for Timer3

IPR2bits.TMR3IP = 0; // Timer3 Interrupt: Low Priority

code for low priority

void __interrupt(__low_priority) LowPriorityISR(void){
    //===Timer3 Interrupt Routine============================================//
    /*
     * Timer3 is used to create a 1 Sec delay.
     * This 1 Sec delay can be used by different tasks.
     */
    if(PIE2bits.TMR3IE && PIR2bits.TMR3IF){
        _1sec++;
        
        if(_1sec == 10)
        {
            RED_LED = !RED_LED;
            if(backlight_timeout) backlight_timeout--;
            if(serial_timeout) serial_timeout--;
            _1sec = 0;
        }
        
        PIR2bits.TMR3IF = 0;
        TMR3H = 0x3C;
        TMR3L = 0xB0;
    }
}

I am using MPLAB XC8 compiler version 6.15 and microcontroller is PIC18f46k22

Kindly guide me what is wrong or missing in the code

 

[FvM]

You don't show the main level code. Both GIEH and GIEL must be set to allow low level interrupt to occur.

 

[Hayee]

working now. actually i haven't set this bit

RCONbits.IPEN = 1;

Thanks.