Kontron JRexplus-LX Manual de usuario descargar pdf (Pagina 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);

}

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Kontron JRexplus-LX Manual de usuario Pagina 17