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4.4 DEMO3
/* demo 3 : Count high pulse of P2C0 */
/* (initial Low & active High) */
/* step 1 : run DEMO3.EXE */
/* -------------------------------------------------------------- */
#include "PIO.H"
#define A1_8259 0x20
#define A2_8259 0xA0
#define EOI 0x20
WORD init_low();
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 */
outportb(wBase,1); /* /RESET -> 1 */
/* step3 : configure I/O direction */
outportb(wBase+0xcc,0x00); /* set CN1 as D/I ports */
init_low();
printf("\n\n***** show the count of High_pulse *****\n");
for (;;)
{
gotoxy(1,8);
printf("\nCOUNT_H=%d",COUNT_H);
if (kbhit()!=0) break;
}
outportb(wBase+5,0); /* disable all interrupt */
PIO_DriverClose();
}
/* Use P2C0 as external interrupt signal */
WORD init_low()
{
disable();
se+5,0); /* disable all interrupt */
mask=inportb(A1_8259+1);
0xff ^ (1<<wIrq));
outportb(wBa
if (wIrq<8)
{
irq
outportb(A1_8259+1,irqmask &
setvect(wIrq+8,irq_service);
}
OME-PIO-D96 User Manual (Ver.1.1, Mar/2003) ---- 41
else