ICP DAS USA PIO-D144 User Manual page 9

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Example 2: assume initial level=High, PC0 is used as interrupt source:
Initial=High
Iniaial_sub()
{ now_int_state=1
_outpd(wBase+0x2a,1)
/*(select the inverted signal)*/
ISR_sub()
{
If (now_int_state==0) /* old state=low ! change to high now */
{
now_int_state=1;
/*** application codes are given here ***/
_outpd(wBase+0x2a,1);
}
else
{
now_int_state=0;
/*** application codes are given here ***/
_outpd(wBase+0x2a,0);
}
if (wIrq>=8) outp(A2_8259,0x20);
outp(A1_8259,0x20);
}
Refer to DEMO4.C for source code.
Inverted=Low
/* now int_signal is High
/* select the inverted signal
/* old state=high! change to low now */
/* now int_signal is Low
/* select the non-inverted signal */
Version: 2.1 Date: 1999/10
PIO-D144 User's Manual
*/
*/
*/
/* EOI */
/* EOI */
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