Hi again ;)

Sorry to disturb you... I still have issues with interrupts and parrallel port.

In a few words : 

My program await on a lpt interrupt (IRQ7), its period is 1ms and the pulse duration is half of this period.

An input pin gives the start and stop signal ("MASK_RUN").

Every time the program catch an interrupt, it toggles one output pin.

This pin state is displayed on a oscilloscope and after around fifteen seconds the execution freezes...

Is it a kind of overflow?

I read some internet pages about lpt port, but didn't find anything about particular servicing.




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


#define IRQ7                              0x07
#define BASE_ADDRESS_LPT1      0x378
#define INTR_BIT                        0x10
#define MASK_RUN                      0x20
#define MASK_TOGGLE		 0x02


struct sigevent event;
volatile int id1;

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

int main(void){

	unsigned char reg;
	unsigned long lpt;

	ThreadCtl(_NTO_TCTL_IO, 0);
	event.sigev_notify = SIGEV_INTR;

	id1 = InterruptAttach(IRQ7, &handler, NULL, 0, 0 );
	/*access to parallel port bytes... to write, read and configure...*/
	lpt = mmap_device_io(3, BASE_ADDRESS_LPT1);

       /* lpt irq activation */
	reg = in8(lpt + 2);
	out8(lpt + 2, reg|INTR_BIT);


	while(~in8(lpt + 1) & MASK_RUN);
	while(in8(lpt + 1) & MASK_RUN){
		InterruptWait(0, NULL);
		reg = in8(lpt);
		out8(lpt, reg ^ MASK_TOGGLE);
	}

	munmap_device_io(lpt, 3);
	InterruptDetach(id1);

	return 0;

}

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

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


I also tried to replace InterruptAttach by InterruptAttachEvent without any succes :/.


Thanks for your help and hints!

Cédric