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KTD-S0006-B Page 12 Watchdog and Backlight

MOPSlcdLX Software Guide

4.2 Backlight Example

#include <stdio.h>

#include <dos.h>

#include <conio.h>

#define JIDA16_INT 0x15

#define BACKL_OUT 0xEA29

#define BACKL_IN 0xEA28

#define JIDA_ID 0x4648

#define BOARD_NUM 1

void WriteBacklight (unsigned char value)

{

union REGS regs;

regs.x.ax = BACKL_OUT;

regs.x.dx = JIDA_ID;

regs.h.cl = BOARD_NUM;

regs.h.ch = value;

int86 (JIDA16_INT, &regs, &regs);

}

unsigned char ReadBacklight (void)

{

union REGS regs;

regs.x.ax = BACKL_IN;

regs.x.dx = JIDA_ID;

regs.h.cl = BOARD_NUM;

int86 (JIDA16_INT, &regs, &regs);

return regs.h.ch;

}

void main (void)

{

unsigned char val;

char str [32];

WriteBacklight (0x80);

val = ReadBacklight ();

sprintf (str, "\n%02X\n", val);

printf (str);

}

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