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Prioritary interrupts on PIC (XC8 compiler)

Discussion in 'Microcontrollers, Programming and IoT' started by Anard, Mar 7, 2018.

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  1. Anard


    Feb 21, 2018
    I'm trying to run a µC (PIC18f26K22) with prioritary interrupts. It generally works fine but it's like when an high priority interrupt stops a low priority interrupt, the µC never returns to the low priority one.
    My program is a little heavy (65ko), so I won't post it here, but is there anything I didn't understand well on using prioritary interrupts ?
    I see in documentation :
    Do I have to save anything when entering in a low interrupt routine or is XC8 compiler handle the problem itself ?
    Thanks for your answers.
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Does this help?
    On another site someone wrote that the XC8 compiler should manage the saving and restoring by itself.
  3. Anard


    Feb 21, 2018
    Thanks. I see that I didn't understand well the way to code interrupts. For example, when I detect a button action, I launch a debounce timer as it
    static void Debounce(void) {
        iCompteurTmr0 = -1;
        TMR0 = 0;                   // Init Timer0
        T0CONbits.TMR0ON = 1;       // Démarre Timer0
    I found clearer in code to call Debouce() for each button, but they advice not using function calls inside the interrupt routines. Maybe using a macro would be more efficient.
    I'll read all this and correct my code, it could be more optimized.
    Last edited: Mar 8, 2018
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