EventLinkInterrupt

This code is to allow use of event link interrupts on the UNO-R4 boards. It works by hijacking the mechanism in IRQManager class that attaches the RTC Carry interrupt. This code includes RTC.h from the core in order to get the RTC configuration struct. I'm not sure what that will break in your code.

It includes four functions:

int attachEventLinkInterrupt(uint8_t eventCode, Irq_f func);

attaches an interrupt handler in the Interrupt Link Controller

eventCode - The 8 bit code for the event link (See User's Manual Table 13.4)

func - void () function to attach as a handler.

returns int - the index of the event link that was used. You need to save this to call resetEventLink in the interrupt handler.

void detachEventLinkInterrupt(int eventLinkInterrupt);

detaches an interrupt by clearing its entry in the IELSR registers This does not remove the entry from the vector table, so you can reattach an interrupt to the same handler with reattachEventLinkInterrupt This is necessary since the IRQManager will not re-use slots

eventLinkIndex - the index of the event link to dettach

int reattachEventLinkInterrupt(uint8_t eventCode, int eventLinkIndex);

reattach an interrupt handler that was prevously detached with detachEventLinkInterrupt

eventCode - The 8 bit code for the event link (See User's Manual Table 13.4)

eventLinkIndex - the index of the event link to reattach

returns int - the index of the event link that was used.

void resetEventLink(int eventLinkIndex);

clears the IR flag in the event link register to clear the interrupt This must be called from the interrupt handler or the board will hang There is probably also another interrupt flag for the event you linked in the registers for the peripheral you are linking

eventLinkIndex - The index of the event