LCD1602显示电路图及程序

程序：

#include "reg52.h"

#define uchar unsigned char

typedef bit BOOL ;

sbit rs = P2^6 ;

sbit rw = P3^6 ;

sbit ep = P2^7 ;

void delay(uchar ms)

{ // 延时子程序

uchar i ;

while(ms--)

{

for(i = 0 ; i<250;i++) ;

}

}

void longdelay(uchar s) //长延时

{

while(s--)

{

delay(60) ;

}

}

BOOL lcd_bz()//测试LCD忙碌状态

{

BOOL result ;

rs = 0 ;

rw = 1 ;

ep = 1 ;

result = (BOOL)(P0 & 0x80) ;

ep = 0 ;

return result ;

}

void write_cmd(uchar cmd)// 写指令

{

while(lcd_bz()) ;

rs = 0 ;

rw = 0 ;

ep = 0 ;

P0 = cmd ;

ep = 1 ;

ep = 0 ;

}

void write_addr(uchar addr)//写地址

{

write_cmd(addr|0x80) ;

}

void write_byte(uchar dat)//写字节

{

while(lcd_bz()) ;

rs = 1 ;

rw = 0 ;

ep = 0 ;

P0 = dat ;

ep = 1 ;

ep = 0 ;

}

void lcd_init()// 初始化

{

write_cmd(0x38) ;

delay(1);

write_cmd(0x08) ;

delay(1);

write_cmd(0x01) ;

delay(1);

write_cmd(0x06) ;

delay(1);

write_cmd(0x0c) ;

delay(1);

}

void display(uchar addr, uchar q)//在某一地址上显示一字节

{

delay(10) ;

write_addr(addr) ;

write_byte(q) ;

longdelay(2) ;

}

main()

{

lcd_init() ; // 初始化LCD

delay(10) ;

// lcd_wcmd(0x07) ; //entry mode set

delay(1) ;

while(1)

{

display(0x00,'R') ;//在第一个位置显示R

display(0x01,0x31)// 在第二个位置显示1，(1的ASCII码为31)

}

}