单片机实现液晶显示

主要器件：

1、AT89C52作为液晶显示的控制芯片。

2、选用内含KS0108B/HD61202控制器的图形液晶显示模块CXM12864，实现128点*64点大小的平板显示，可以满足一般的显示要求。

3、双电压输出升压芯片MAX1677专用LCD电源芯片。

试验电路图：

试验程序代码：

//lcd_show.h程序

#ifndef_LCD_SHOW_H//防止lcd_show.h被重复引用

#define_LCD_SHOW_H

#include <at89c51.h>

#include

unsigned char code QING[32]={

/*请*/

0x20,0x22,0xEC,0x00,0x20,0x22,0xAA,0xAA,

0xAA,0xBF,0xAA,0xAA,0xEB,0xA2,0x20,0x00,

0x00,0x00,0x7F,0x20,0x10,0x00,0xFF,0x0A,

0x0A,0x0A,0x4A,0x8A,0x7F,0x00,0x00,0x00

};

unsigned char code CHA[32]={

/*插*/

0x10,0x10,0x10,0xFF,0x90,0x24,0x24,0xA4,

0x24,0xFC,0x22,0x23,0x22,0xB0,0x20,0x00,

0x02,0x42,0x81,0x7F,0x00,0xFF,0x49,0x48,

0x40,0x7F,0x40,0x49,0x49,0xFF,0x01,0x00

};

unsigned char code KA[32]={

/*卡*/

0x40,0x40,0x40,0x40,0x40,0x40,0xFF,0x44,

0x44,0x44,0x46,0x44,0x40,0x60,0x40,0x00,

0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,

0x02,0x04,0x0C,0x18,0x00,0x00,0x00,0x00

};

#define LCD XBYTE[0xffff] /* LCD端口*/

#endif

//lcd_show.c程序实现显示“请插卡”

#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"

}