lcd_show.c

本程序的主要功能是利用51单片机实现液晶显示

/*****************************************/
/* Copyright (c) 2005, 通信工程学院        */
/* All rights reserved.                  */
/* /* 作    者：戴佳				      */
/*****************************************/

#include "lcd_show.h"

#define uint unsigned int
#define uchar unsigned char

#define CSA P2_1
#define CSB P2_0
#define E P2_3
#define RW P2_5
#define DI P2_6

sbit busy_bit=ACC^7;		//lcd state byte bit 7

/*下面是对液晶屏gxm12864d操作的函数, 128x64点阵，汉字显示，CSA,CSB用来进行左右显示区的选择。*/

/*  发命令i到主窗口*/
void lcd_mwc(uchar i)
{	 
     CSA=1;
     CSB=0;
     RW=1;
     DI=0;
     do {ACC=LCD;} 
	 while (busy_bit) ;//wait for lcd not busy
     RW=0;
     LCD=i;
}

/*  写数据i到主窗口*/
void lcd_mwd(uchar i)
{	 
     CSA=1;
     CSB=0;
     RW=1;
     DI=0;
     do {ACC=LCD;} while (busy_bit);//wait for lcd not busy
     RW=0;
     DI=1;
     LCD=i;
}

/*   清屏                                */
void lcd_clear(void)
{
     uchar i;
     uchar page;
     for (page=0xb8;page<0xc0;page++)
         {
             lcd_mwc(page);       /*设置显示页面*/

             lcd_mwc(0x40);       /*设置列地址*/
 
             for (i=0;i<64;i++)
             {
   
                 lcd_mwd(0);
             }
         }
}

//初始化lcd
void lcd_init(void)
{
	lcd_mwc(0xc0);

	lcd_mwc(0x3f);

}

//dispm_hz_up() display up half of a hanzi in left area
void dispm_hz_up(uchar code * hz)
{
	uchar i;
	for (i=0;i<16;i++) lcd_mwd(*(hz+i));
}

//dispm_hz_down() display down half of a hanzi in left area
void dispm_hz_down(uchar code * hz)
{
	uchar i;
	for (i=16;i<32;i++) lcd_mwd(*(hz+i));
}


void main(void)
{
	E=1;
	lcd_clear();
	lcd_init();

	lcd_mwc(0xb8);
	lcd_mwc(0x40);
	
	dispm_hz_up(&QING);
	dispm_hz_up(&CHA);
	dispm_hz_up(&KA);
	
	lcd_mwc(0xb9);
	lcd_mwc(0x40);
	
	dispm_hz_down(&QING);
	dispm_hz_down(&CHA);
	dispm_hz_down(&KA);//display "请插卡"	

}