Hi Thomas, 

Thank you for the advice,

I did missed ThreadCtl(_NTO_TCTL_IO) , now I added following lines in the main() function.

	if (ThreadCtl(_NTO_TCTL_IO, 0) == -1) {
		printf("ThreadCtl\r\n");
		return (!EOK);
	}

return result =5. 

However, I still didn't get interrupt yet. Exact same thing happened as previous post on beaglebone black, i.e., gpio 
pin bears correct value when button pushed, however, the program never enters interrupt handler.

http://community.qnx.com/sf/discussion/do/listPosts/projects.core_os/discussion.newcode.topc27325

My question is whether this IRQ number 61 is acknowledged by QNX when I used InterruptAttach, or QNX tends to assign its
 own IRQ number.

                    /* Definitions for Fabric interrupts connected to ps7_scugic_0 */
                    #define XPAR_FABRIC_AXI_GPIO_0_IP2INTC_IRPT_INTR 61

Please advise, thanks in advance

Mike

Hi QNX,

I made more progress, but still not there yet. Now, the program will hang whenever I push the button. Below is the 
source code,


#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <sys/neutrino.h>
#include <sys/syspage.h>
#include <sys/mman.h>
#include <hw/inout.h>
#include <hw/gpio.h>

#define XPAR_GPIO_0_BASEADDR 0x41200000		// buttons

int irq  = 61;
static uint32_t irqcount = 0;

static void Delay1(volatile unsigned int count)
{
    while(count--);
}

static const struct sigevent *handler(void *area, int id)
{
	irqcount++;
	return NULL;
}


int main(int argc, char *argv[])
{
	if (ThreadCtl(_NTO_TCTL_IO, 0) == -1) {
		printf("ThreadCtl\r\n");
		return (!EOK);
	}

    	// pin configuration ...
    	uintptr_t gpio_base = mmap_device_io(0x10000, XPAR_GPIO_0_BASEADDR);
        if(gpio_base == MAP_DEVICE_FAILED)
        {
            perror("Can't map device I/O");
            return 0;
        }

        out32(gpio_base + 0x4, 0xFF); 			// 1 as inputs.
        out32(gpio_base + 0x0128, 0x1); 		        // IP IER: channel 1 enable
        out32(gpio_base + 0x011C, 0x80000000);     // GIER global enable

//        InterruptEnable();

    	int result = InterruptAttach( irq, &handler, &gpio_base, 0x10000, _NTO_INTR_FLAGS_PROCESS);
    	if(result == -1)
    	{
    		printf("InterruptAttach wrong\r\n");
    	}
    	else
    	{
    		printf("Attached IRQ ID0 = %d\r\n", result);
    	}

    	while(1)
    	{
            Delay1(0xFFFFFF);
            Delay1(0xFFFFFF);
            Delay1(0xFFFFFF);
            Delay1(0xFFFFFF);

	    printf("connected %u\n", irqcount);

    	}

    munmap_device_io(gpio_base, 0x10000);

    return 1;
}

Please advise, thanks in advance

Mike