Microblaze GPIO interrupt

I've hit a brick wall with this. I just can't figure out what I'm doing wrong, or not doing right!

I just want to generate an interrupt when the pushbutton (PB) is pressed. This is the only interrupt so far, but I'm using INTC because I want to expand this soon.

The MHS file has: BEGIN opb_intc PARAMETER INSTANCE = opb_intc_0 PARAMETER HW_VER = 1.00.c PARAMETER C_BASEADDR = 0x41200000 PARAMETER C_HIGHADDR = 0x4120ffff BUS_INTERFACE SOPB = mb_opb PORT Irq = Interrupt PORT Intr = Push_Buttons_1Bit_IP2INTC_Irpt END

BEGIN opb_gpio PARAMETER INSTANCE = Push_Buttons_1Bit PARAMETER HW_VER = 3.01.b PARAMETER C_INTERRUPT_PRESENT = 1 PARAMETER C_GPIO_WIDTH = 1 PARAMETER C_IS_DUAL = 0 PARAMETER C_ALL_INPUTS = 1 PARAMETER C_IS_BIDIR = 0 PARAMETER C_BASEADDR = 0x40040000 PARAMETER C_HIGHADDR = 0x4004ffff BUS_INTERFACE SOPB = mb_opb PORT OPB_Clk = sys_clk_s PORT IP2INTC_Irpt = Push_Buttons_1Bit_IP2INTC_Irpt PORT GPIO_in = fpga_0_Push_Buttons_1Bit_GPIO_in END

BEGIN microblaze (snip) PORT Interrupt = Interrupt (snip) END

This is my code:

microblaze_enable_interrupts(); /* Register the UART interrupt handler in the vector table */ XIntc_RegisterHandler(XPAR_OPB_INTC_0_BASEADDR,XPAR_OPB_INTC_0_PUSH_BUTTONS_1BIT_IP2INTC_IRPT_INTR, (XInterruptHandler)pb_int_handler,(void

*)XPAR_PUSH_BUTTONS_1BIT_BASEADDR); /* Start the interrupt controller */ XIntc_mMasterEnable(XPAR_OPB_INTC_0_BASEADDR); /* Enable PB interrupt requests in the interrupt controller */ XIntc_mEnableIntr(XPAR_OPB_INTC_0_BASEADDR,XPAR_PUSH_BUTTONS_1BIT_IP2INTC_IRPT_MASK); /* Enable PB interrupts */ XGpio_InterruptGlobalEnable(XPAR_PUSH_BUTTONS_1BIT_BASEADDR); XGpio_InterruptEnable(XPAR_PUSH_BUTTONS_1BIT_BASEADDR, XPAR_PUSH_BUTTONS_1BIT_IP2INTC_IRPT_MASK);

/* Wait for interrupts */ while (1){ if (num_interrupts >= 1){ xil_printf("-- Number of interrupts received : %x \n\r", num_interrupts); }

When debugging I can see that the IE bit in the MSR gets set. The code hangs on XGpio_InterruptGlobalEnable(XPAR_PUSH_BUTTONS_1BIT_BASEADDR);

The function in question from xgpio_intr.c:

void XGpio_InterruptGlobalEnable(XGpio *InstancePtr) { XASSERT_VOID(InstancePtr != XNULL); XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY); XASSERT_VOID(InstancePtr->InterruptPresent == XTRUE);

XIIF_V123B_GINTR_ENABLE(InstancePtr->BaseAddress + XGPIO_IPIF_OFFSET); }

Any help greatly appreciated.