fix - KL46Z cmsis header (v2.2), shared interrupt PORTCD

[0xc0170]

The ollder KL46Z CMSIS header file falsely named IRQ vector PORTD which is actually PORTC and PORTD interrupt vector. I changed gpio irq implementation to reflect this header file update.

I also added a small comment to enable/disable_irq in the interruptIN class for users awareness of what it can do.

Please keep this request open until Sam's approval. Thanks.

Regards,
0xc0170

[sg-]

I tried to add a this change using github edit but cant seem to get the tool to work ;( Anyways, all seems good with one change needed.

In gpio_irq_api.c the implementation of qpio_irqCD need to test for the PORT being powered:

void gpio_irqCD(void) {
    /* PORTC and PORTD share same vector - Make sure the PORT is powered before reading or HARD FAULT!! */
    if ((SIM->SCGC5 & (1 << SIM_SCGC5_PORTC_SHIFT)) == (1 << SIM_SCGC5_PORTC_SHIFT))
        handle_interrupt_in(PORTC, 32);
    if ((SIM->SCGC5 & (1 << SIM_SCGC5_PORTD_SHIFT)) == (1 << SIM_SCGC5_PORTD_SHIFT))
        handle_interrupt_in(PORTD, 64);
}

This will avoid hard faulting if the user doesn't have a pin created on both PORTC and PORTD since they both share a handler.

I guess you could also enable power to PORTC when PORTD pins are created and the other way around to save a few instructions in the IRQ.