Omega OME-PIO-D144 manual Refer to Sec .5.2 for more information

outp(wBase+5,0);	/* disable all interrupt */
PIO_DriverClose();
}
/* ------------------------------------------------------------		*/
/* Use PC0 as external interrupt signal		*/
WORD init_high()
{
DWORD dwVal;
disable();
outp(wBase+5,0);	/* disable all interrupt */
if (wIrq<8)
{
irqmask=inp(A1_8259+1);
outp(A1_8259+1,irqmask & (0xff ^ (1 << wIrq)));
setvect(wIrq+8, irq_service);
}
else
{

irqmask=inp(A1_8259+1);		/* IRQ2 */
outp(A1_8259+1,irqmask & 0xfb);
outp(A1_8259+1,irqmask & (0xff ^ (1 << wIrq)));
irqmask=inp(A2_8259+1);
outp(A2_8259+1,irqmask & (0xff ^ (1 << (wIrq-8))));
setvect(wIrq-8+0x70, irq_service);
}
outp(wBase+5,1);	/* enable interrupt		*/
now_int_state=1;	/* now int_signal is low		*/
outp(wBase+0x2a,1);	/* select the inverte input */
enable();
}
void interrupt irq_service()
{
if (now_int_state==0)
{	/* find a high_pulse here		*/
outp(wBase+0x2a,1);
	/* select the inverte input */
now_int_state=1;	/* now int_signal is High		*/
}
else
{	/* find a low_pulse		*/
COUNT++;
outp(wBase+0x2a,0);	/* select the non-inverte input */
now_int_state=0;	/* now int_signal is High		*/
}

if (wIrq>=8) outp(A2_8259,0x20); outp(A1_8259,0x20);

}

Refer to Sec. 2.5.2 for more information.

OME-PIO-D144 User’s Manual (Ver.2.1, Sep/2001) ---- 42