单片机驱动2004液晶测试程序，4线 8线控制器HD44780 -

/*=========================================================
LCD2004模拟口线接线方式连接线图: =
---------------------------------------------------- =
| LCM-----51 | LCM-----51 | LCM------51 | | =
---------------------------------------------------| =
| | RS -------P3.5 | | =
| | RW------- GND | | =
| | E --------P3.4 | | =
| | | | =
| DB4-----P0.4 | | | =
| DB5-----P0.5 | | | =
| DB6-----P0.6 | | | =
| DB7-----P0.7 | | | =
---------------------------------------------------- =
[注:AT89S51 使用 11.0592M 晶体震荡器] =
=========================================================*/
#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit LCM_RS=P3^5; //定义引脚
sbit LCM_E =P3^4;
sbit LED =P2^5;//LED 的输出锁存端
sbit dula =P2^6;//数码管的段锁存端 74HC573
sbit wela =P2^7;//数码管的位锁存端
#define LCM_Data P0
#define Busy 0x80 //用于检测 LCM 状态字中的 Busy 标识
uchar num;
uchar code table0[]="ABCDEFGHIJKLMNOPQRST";
uchar code table1[]="01234567890123456789";
uchar code table2[]="UVWXYZ!@#%&?+<[>]*-;";
uchar code table3[]="abcdefghijklmnopqrst";
void delay(uint z)//延时函数
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
//写数据 RS=H,RW=L,D0~D7=数据,E=高脉冲
void WriteDataLCM(uchar Data)
{
LCM_RS = 1;
LCM_E = 0;
LCM_Data =(Data & 0xF0);
LCM_E = 1;
delay(5);
LCM_E = 0;
LCM_Data =(Data & 0x0F)<<4;
LCM_E = 1;
delay(5);
LCM_E = 0;
}
//写指令 RS=L,RW=L,D0~D7=指令码,E=高脉冲
void WriteCommandLCM(uchar Command)
{
delay(5); //短暂延时，代替检测忙状态
LCM_RS = 0;
LCM_E = 0;
LCM_Data =( Command & 0xF0);
LCM_E = 1;
delay(5);
LCM_E = 0;
LCM_Data =( Command & 0x0F )<<4;
LCM_E = 1;
delay(5);
LCM_E = 0;
}
//读数据 RS=H,RW=H,E=H
//读状态 RS=L,RW=H,E=H
//由于不要检测忙，所以读数据和读状态两个函数省略
void LCMInit(void) //LCM 初始化
{
WriteCommandLCM(0x03);
delay(5);
WriteCommandLCM(0x02);
delay(5);
WriteCommandLCM(0x28); //显示模式设置,开始要求每次检测忙信号
WriteCommandLCM(0x0C);
WriteCommandLCM(0x06); // 显示光标移动设置
WriteCommandLCM(0x01);
delay(5);
}
void main(void)
{
LED=0; //将LED的锁存端关闭
dula=0;//将数码管的段锁存端关闭
wela=0;//将数码管的位锁存端关闭
LCMInit(); //LCM 初始化
//第一行显示
WriteCommandLCM(0x80+0x00);
for(num=0;num<20;num++)
{
WriteDataLCM(table0[num]);
delay(250);
}
//第二行显示
WriteCommandLCM(0x80+0x40);
for(num=0;num<20;num++)
{
WriteDataLCM(table1[num]);
delay(250);
}
//第三行显示
WriteCommandLCM(0x80+0x14);
for(num=0;num<20;num++)
{
WriteDataLCM(table2[num]);
delay(250);
}
//第四行显示
WriteCommandLCM(0x80+0x54);
for(num=0;num<20;num++)
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