Kontron JRexplus-LX - Manual (Page 17)

KTD-S0004-A Page 14 Watchdog, Digital I/O and Backlight
JRexplus LX Software Guide
5.2 Digital I/O Example
#include <stdio.h>
#include <dos.h>
#include <conio.h>
#define JIDA16_INT 0x15
#define GPIO_OUTPUT 0xEA51
#define GPIO_INPUT 0xEA52
#define JIDA_ID 0x4648
#define GPIO_MASK 0x0F
#define BOARD_NUM 1
void WriteDigitalIO (unsigned char value)
// only lower nibble valid
{
union REGS regs;
regs.x.ax = GPIO_OUTPUT;
regs.x.dx = JIDA_ID;
regs.h.cl = BOARD_NUM;
regs.h.ch = (value & GPIO_MASK);
int86 (JIDA16_INT, &regs, &regs);
}
unsigned char ReadDigitalIO (void)
// only lower nibble valid
{
union REGS regs;
regs.x.ax = GPIO_INPUT;
regs.x.dx = JIDA_ID;
regs.h.cl = BOARD_NUM;
int86 (JIDA16_INT, &regs, &regs);
return (regs.h.bl & GPIO_MASK);
}
void main (void)
{
unsigned
char val;
char str [32];
WriteDigitalIO (0x05);
getch ();
WriteDigitalIO (0x0A);
getch ();
val = ReadDigitalIO ();
sprintf (str, "\n%02X\n", val);
printf (str);
}