51驱动1602液晶显示器的程序

//1602.h

#include

//数据类型定义

typedef unsigned char uchar;

typedef unsigned int uint;

//1602指令定义

//屏幕初始化

#define SCREEN_INIT 0x38 //屏幕设置:16*2行,5*7点阵,8位数据接口

//光标及屏幕显示设置

#define SHOW_SCREEN 0x0C //屏幕显示

#define HIDE_SCREEN 0x08 //屏幕不显示

#define SHOW_CURSOR 0x02 //显示光标

#define FLASH_CURSOR 0x01 //光标闪烁

//地址指针及滚动设置

#define DPTR_INC 0x06 //读/写一个字节地址指针+1,光标+1

#define DPTR_DEC 0x04 //读/写一个字节地址指针-1,光标-1

#define SCREEN_SCR 0x01 //写一个字符,整屏左移/右移

//ADDR设置

#define ADDR_LINE1 0x80 //第一行

#define ADDR_LINE2 0xC0 //第二行

#define LINE1_END 0x10

#define LINE2_END 0x50

//忙碌状态

#define BUSY 0x80

//清屏

#define CLR_SCR 0x01 //清屏

//DPTR清零

#define CLR_DPTR 0x02 //数据指针清零

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//1602.c

#include

#include

#include "1602.h"

//女孩不哭

//2012-10-25

//ts=sts=sw=4

//以下是端口定义,自行修改

sbit RS = P0^0; //数据/指令选择

sbit RW = P0^1; //读/写控制

sbit E = P0^2; //使能

#define DATA P2 //数据端口 P[0~7] -> DATA[0~7]

/*

函数:微秒延时

参数:

us[uchar]:微秒

返回:(无)

*/

void delay_us(uchar us)

{

for(; us>0; us--)

_nop_();

}

/*

函数:10毫秒延时

参数:

ms10[uint]:10毫秒

返回:(无)

*/

void delay_10ms(uint ms10)

{

uchar x,y,z;

while(ms10--){

for(x=5; x>0; x--);

for(y=4; y>0; y--);

for(z=248; z>0; z--);

}

}

/*

函数:读取1602状态

参数:(无)

返回:(无)

说明:最高位为忙碌状态位,1代表忙碌

*/

uchar read_state(void)

{

DATA = 0xff;

RW = 1;

RS = 0;

E = 1;

return DATA;

}

/*

函数:执行一条命令

参数:

cmd[uchar]:命令

返回:(无)

*/

void do_cmd(uchar cmd)

{

while(read_state()&BUSY)

_nop_();

RS = 0;

RW = 0;

DATA = cmd;

E = 1;

delay_us(50);

E = 0;

delay_us(50);

}

/*

函数:1602初始化

参数:(无)

返回:(无)

*/

void init_lcd(void)

{

do_cmd(CLR_SCR);//清屏

do_cmd(SCREEN_INIT);//显示模式设置

do_cmd(SHOW_SCREEN|SHOW_CURSOR/*|FLASH_CURSOR*/);

do_cmd(DPTR_INC);

}

/*

函数:写一个字节到显存

参数:

ch[uchar]:显示字符ASCII码

返回:(无)

*/

void write(uchar ch)

{

uchar addr;

while(read_state()&BUSY)

;

//换行处理

addr = read_state()&~BUSY;

if(addr == LINE1_END)

do_cmd(ADDR_LINE2);

else if(addr == LINE2_END)

do_cmd(ADDR_LINE1);

RW = 0;

RS = 1;

DATA = ch;

E = 1;

delay_us(50);

E = 0;

delay_us(50);

}

void write_str(uchar line, uchar pos, uchar* str)

{

uchar addr;

uchar* ptr;

if(line!=1 && line!=2)

return;//只能是第1,2行

if(pos>16)

return;//只能是第 1~16 个字符

//pos=0表示从当前位置开始写,忽略行

if(pos){

addr = (line==1?ADDR_LINE1:ADDR_LINE2)+pos-1;

do_cmd(addr);

}

for(ptr=str; *ptr; ptr++){

write(*ptr);

delay_10ms(80);

}

}

#if 0

void main(void)

{

uchar str[16] = {0};

uchar x;

delay_10ms(10);

init_lcd();

write_str(1,1,"012345671");

delay_10ms(200);

write_str(2,1,"AbCdEfGhIjK");

delay_10ms(200);

write_str(1,1,"Nv Hai Bu Ku!");

delay_10ms(200);

do_cmd(CLR_SCR);

do_cmd(SHOW_SCREEN|FLASH_CURSOR);

write_str(1,1,"this is a very very very long string!");

for(x=0; x<4; x++){

do_cmd(HIDE_SCREEN);

delay_10ms(300);

do_cmd(SHOW_SCREEN);

delay_10ms(300);

}

do_cmd(SHOW_SCREEN);

delay_10ms(200);

do_cmd(CLR_SCR);

write_str(1,1,"Screen will now Scroll....");

delay_10ms(300);

do_cmd(DPTR_INC|SCREEN_SCR);

write_str(1,0,"Screen Scrolling");

do_cmd(DPTR_DEC|SCREEN_SCR);

write_str(1,0,"Screen Scrolling");

do_cmd(DPTR_INC);

delay_10ms(200);

do_cmd(CLR_SCR);

for(x=0x20; x<0xdf; x++){

write(x);

delay_10ms(80);

}

delay_10ms(200);

do_cmd(CLR_SCR);

write_str(2,1," ... what??");

for(;;){

}

}

#endif