c code to use XINT1

I have modified one of Jess' old programs to attempt to use XINT1. The main program only loops and then the ISR also loops.

At the moment, the isr is not being accessed. See below for the diagram from the system control and interrupts guide p 6-2 that shows what needs to be set up.



I have setup the PIEIER:

// set up XINT1
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.XINT1 = &xint1_isr; //define where xint1_isr is in the vector table
PieCtrlRegs.PIEIER1.bit.INTx4=1; // PIE Group 1, INT4 (XINT1) sci rev guide p 6/23
EDIS;

however I have not set up INTM or IER which could be why it is not working

another good diagram is:



this should tell me how far through the interrupt is getting. I should be able to see if PIEACKx = 1 when I set off the interrupt.