[En-Nut-Discussion] External interrupts on Ethernut 3

[Petri Hyötylä]

Hi all,

I have been porting my application from Ethernut 2 to Ethernut 3and I have
one final thing to do before I can start final testing: Enable one external
interrupt in an MCP2515 driver which I wrote.
I followed the way it was done in
http://www.ethernut.de/api/ax88796_8c-source.html#l00961 but there is a part
that confuses me. What function pointer should I give to the
interrupt/exception handler? This is also the first time I write for the ARM
architecture so if there is something wrong or suboptimal in the code,
please comment.

    //Register the interrupt to Nut/OS
    NutRegisterIrqHandler(&CAN_SIGNAL, CAN_Interrupt, NULL);

    #ifdef ETHERNUT2

    ....

    #endif

    #ifdef ETHERNUT3

    NutEnterCritical();

    // Register interrupt handler and enable interrupts.
    // Disable FIQ interrupts.
    outr(AIC_IDCR, _BV(FIQ_ID));


****************************
    What should I put here?
    In http://www.ethernut.de/api/ax88796_8c-source.html#l00961
    a pointer to the interrupt handler was given as follows:
    /* Set the TC0 IRQ handler address */
    outr(AIC_SVR(IRQ0_ID), (unsigned int) NicInterruptEntry);
*******************************

    /* Set FIQ to low level sensitive
     * This is the default so this part is done just in case
     * something has changed the register value
     */
    outr(AIC_SMR0, 0);
    // Clear FIQ interrupt
    outr(AIC_ICCR, _BV(FIQ_ID));
    // Enable FIQ interrupt
    outr(AIC_IECR, _BV(FIQ_ID));
    // Enable PIO interrupt for the P12(FIQ). Redundant?
    outr(PIO_IER, _BV(12));

    NutExitCritical();

    #endif

Regards,
Petri