Omega Engineering OME-PIO-D96 manual DEMO4

4.5DEMO4

/* demo 4 : Count high pulse of P2C0			*/
/*	(initial High & active Low)		*/
/* step 1 : run DEMO4.EXE			*/
/* --------------------------------------------------------------			*/
#include "PIO.H"
#define A1_8259 0x20
#define A2_8259 0xA0
#define EOI	0x20
WORD init_high();
WORD wBase,wIrq;
static void interrupt irq_service();
int COUNT_L,COUNT_H,irqmask,now_int_state;
int main()
{
int i,j;
WORD wBoards,wRetVal,t1,t2,t3,t4,t5,t6;
WORD wSubVendor,wSubDevice,wSubAux,wSlotBus,wSlotDevice;
char c;
clrscr();
/* step1 : find address-mapping of PIO/PISO cards			*/
.
.		/* select card_0 */
/* step2 : enable all D/I/O port
		/* /RESET -> 1	*/
outportb(wBase,1);			*/
/* step3 : configure I/O direction			*/
outportb(wBase+0xcc,0x00);		/* set CN1 as D/I ports */
init_high();
printf("\n\n***** show the count of Low_pulse *****\n");
for (;;)
{
gotoxy(1,7);
printf("\nCOUNT_L=%d",COUNT_L);
if (kbhit()!=0) break;
}		/* disable all interrupt */
outportb(wBase+5,0);
PIO_DriverClose();
}
/* Use P2C0 as external interrupt signal			*/
WORD init_high()
{
disable();		/* disable all interrupt */
outportb(wBase+5,0);
if (wIrq<8)
{
irqmask=inportb(A1_8259+1);
outportb(A1_8259+1,irqmask & 0xff ^ (1<<wIrq));
setvect(wIrq+8,irq_service);
}
else
OME-PIO-D96 User Manual (Ver.1.1, Mar/2003)			---- 43