NetBurner Community Forum

Code: Select all

void ClearISR(PinIO pin)
{
    int idx = &(pin.pio) - PIOA;                // PIO controller index
    volatile uint32_t isr = pin.pio.PIO_ISR;    // Interrupt Status Register, clears on read
    uint32_t imr = pin.pio.PIO_IMR;             // Interrupt Mask Register

    // Since up to 32 pins are grouped into a PIO controller, interrupts for each pin in the given PIO must be handled upon reading the PIO_ISR reg
    if (isr & imr)  // check if any interrupts are enabled and if any interrupt events occurred
    {
        for (int i = 0; i < 32; i++)
        {
            // if the interrupt is enabled, an interrupt event occurred, an ISR function is registered, and
            // the interrupt pin is NOT the pin given as a parameter, then call the ISR function.
            if ((isr & imr & (1U << i) & ~pin.mask) && PIO_Vects[(idx * 32) + i]) { PIO_Vects[(idx * 32) + i](idx, i); }
        }
    }
}

Code: Select all

#ifdef MODM7AE70
/**
 * @brief Clears the Interrupt Status Register (PIO_ISR) for a given pin.
 *
 * This function will clear the interrupt for a given pin by accessing the PIO_ISR
 * register, which is cleared upon reading. Since up to 32 pins are grouped into
 * a PIO controller and reading the PIO_ISR clears the interrupt for all pins in
 * a given PIO, interrupts for every pin that are grouped into the given pin's PIO
 * are handled by this function.
 *
 * @param pin   A PinIO object that is to be configured as an IRQ Pin.
 *
 * @returns     the contents of the status register (PIO_ISR) for a given pin.
 */
uint32_t ClearISR(PinIO pin);
#endif // end MODM7AE70