lcdtest.c

这个是LCD1602的测试程序

#include<reg51.h>
#include "intrins.h"
#define uchar unsigned char
#define uint unsigned int
#define nop _nop_()
void CheckLcdBusy();
uchar code table[]="I LOVE MCU!";
uchar code table1[]="WWW.TXMCU.COM";
sbit lcden=P2^7;	//液晶使能端
sbit lcdrw=P2^6;
sbit lcdrs=P2^5;	//液晶数据命令选择端
uchar num;
void delay(uint z)
{
	uint x,y;
	for(x=z;x>0;x--)
		for(y=110;y>0;y--);
}
void write_com(uchar com)
{
    CheckLcdBusy();
	lcdrw=0;
	lcdrs=0;
    lcden=1;
	P0=com;
    delay(1);
    lcden=0;
    delay(1);
   lcden=1;
    P0=(com<<4);
	delay(5);
	lcden=0;
}
void write_data(uchar date)
{
    CheckLcdBusy();
    lcdrw=0;
	lcdrs=1;
    lcden=1;
	P0=date;
    delay(1);
    lcden=0;
    delay(1);
    lcden=1;
    P0=(date<<4);
	delay(5);
	lcden=0;
}
void init()
{
 delay(20);
lcdrw=0;
lcdrs=0;nop;
lcden=0;nop;
lcden=1;nop;
P0=0x20;nop;
lcden=0;delay(5);
lcden=1;nop;
P0=0x20;nop;
lcden=0;delay(1);
lcden=1;nop;
P0=0x20;nop;
lcden=0;
//delay(1);
write_com(0x01);//清屏
write_com(0x28);//设置4位操作，1行显示，5x8
write_com(0x02);//光标归位
write_com(0x06);//AC自动加1，画面不动
write_com(0x0c);//0x0f:光标闪烁开；  
write_com(0x01);//清屏	
}

void main()
{
    delay(15);
	init();
	write_com(0x80);
	for(num=0;num<11;num++)
	{
		write_data(table[num]);
		delay(5);
	}
	write_com(0x80+0x40);
	for(num=0;num<13;num++)
	{
		write_data(table1[num]);
		delay(5);
	}
	while(1);
}
void CheckLcdBusy()
{uchar Temp,t;
    P0=0xff;
    lcdrw=1;
    lcdrs=0;nop;
    lcden=0;nop;
do
 {nop;
 lcden=1;nop;
 Temp=P0;
 nop;nop;nop;
 lcden=0;nop;nop;
delay(1);
lcden=1;nop;
t=P0;
nop;nop;nop;
lcden=0;nop;nop;

 Temp&=0x80;
 }while(Temp==0x80);
}