Hi there :)

I wrote a test application to work with the parallel port. The following code works, but after around 20k interrupts, 
the programm freezes.

I place an external source with these parameter :
 - period = 100us
 - pulse duration = 20us

I also increase these parameters, but the problem persists.


Can someone help me?




//******************************************************************************


#include <stdio.h>
#include <sys/neutrino.h>
#include <hw/inout.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/mman.h>



#define IRQ7                              0x07
#define BASE_ADDRESS_LPT1      0x378
#define INTR_BIT                        0x10
#define INIT_BIT			 0x04
#define MASK_OVLD                    0x01
#define MASK_RUN                      0x20
#define MASK_ACK                      0x10

struct sigevent event;
volatile int id1;

const struct sigevent *handler(void *area, int id);

int main(void){

	//variables
	int i;
	unsigned char reg;
	unsigned long lpt;


	ThreadCtl(_NTO_TCTL_IO, 0);
	event.sigev_notify = SIGEV_INTR;
	
        id1 = InterruptAttach(IRQ7, &handler, NULL, 0, 0 );
	lpt = mmap_device_io(3, BASE_ADDRESS_LPT1);


	reg = in8(lpt + 2);
	out8(lpt + 2, reg|INTR_BIT|INIT_BIT);

	

	while (in8(lpt + 1) & MASK_RUN){
		InterruptWait(0, NULL);
		i += 1;
		i %= 10000;
		printf("int %d.\n", i);

	}
	printf("end of test\n");
	
        munmap_device_io(lpt, 3);
	InterruptDetach(id1);

	return 0;

}

const struct sigevent *handler(void *area, int id) {
	if (id == id1)
            return &event;
        else
            return NULL;

}

//**********************************************************