我看郭天祥的十天学会51单片机里的程序，买了块TX的51开发板 编写1602液晶显示的程序

所有人回答的都不对，其实是忘了将1602第5脚rw设置为0了，而郭天祥的板子是直接接地，所以不用设置，但是别的板子却不能照搬了。所以程序应改为

sbit lcdrw=P3^6;

void write_com(uchar com)

{

lcdrs=0;

lcdrw=0;//加这一条

P0=com;

delay(5);

lcden=1;

delay(5);

lcden=0;

}

void write_data(uchar date)

{

lcdrs=1;

lcdrw=0;//加这一条

P0=date;

delay(5);

lcden=1;

delay(5);

lcden=0;

}

void init_1602()

{

LCD_1602_EN=0;

LCD_1602_RW=0; //这句话你忘写了，液晶数据也不进去的。。

write_1602_com(0x38); //设置16X2显示，5X7点阵，8位数据接口

write_1602_com(0x0e); //设置开显示，不显示光标

write_1602_com(0x06); //写一个字符后地址指针加1

write_1602_com(0x01); //显示清0，数据指针清0

write_1602_com(0x80); //设置初始显示为第一行第一列

}

应该不是判断忙碌或者不只是判断忙碌，这个语句应该是送了一串命令进去

//HD44780 LCD DRIVER

#include <AT89X52H>

#include <ctypeh>

//LCD Commands

#define LCD_CLS 1 //Clears entire display and sets DDRAM address 0

#define LCD_HOME 2 //Sets DDRAM address 0 in address counter

#define LCD_SETMODE 4 //Sets cursor move direction and specifies display shift

#define LCD_SETVISIBLE 8 //Sets entire display (D) on/off,cursor on/off (C), and blinking of cursor position character (B)

#define LCD_SHIFT 16 //Moves cursor and shifts display without changing DDRAM contents

#define LCD_SETFUNCTION 32 //Sets interface data length (DL), number of display lines (N), and character font (F)

#define LCD_SETCGADDR 64 //Sets CGRAM addressCGRAM data is sent and received after this setting

#define LCD_SETDDADDR 128 //Sets DDRAM address DDRAM data is sent and received after this setting

#define TURE 1

#define FORSE 0

#define TMH 0xf8 //delay timeh 2ms

#define TML 0xCD //delay timel

//------------------------------------------

#define MAX_DISPLAY_CHAR 2

//-----------------------------------------

unsigned char code text[6]="hellow";

static unsigned char data counter,a;

void wcchar(unsigned char d); //write a command char

void wdchar(unsigned char i); //write a data char

char wtbusy(); //wait busy sign

void clrscr(void); //clear screen

void initime0(void); //initial time0

void delay(unsigned char i); //delay

//-------------------------------

unsigned char crc8(unsigned char pData,unsigned char count);

unsigned char pData[]={0x33,0x12,0x34,0x56,0x78,0x33,0x12,0x23,0x45,0x56};

unsigned char data crc;

static char outputbuffer[MAX_DISPLAY_CHAR];

char calc_decascii(char num);

//-------------------------------

void ISR_Timer0(void) interrupt 1

{

TL0=TML;

TH0=TMH;

counter--;

}

void ISR_Int0(void) interrupt 0

{

wdchar(text[a++]); //display "hellow"

if (a>=6)

{a=0;wdchar(' ');}

}

//main program display "hellow"

main(void)

{

unsigned char data k;

initime0();

wcchar(0x38); //initial lcd

wcchar(LCD_SETVISIBLE+6); //set lcd visible

clrscr(); //clear lcd

while(1)

{

crc8(&pData,10);

calc_decascii(crc);

wdchar (outputbuffer[1]);

wdchar (outputbuffer[2]);

wdchar (' ');

for(k=0;k<=6;k++)

{

// wdchar(text[k]); //display "hellow"

P1_2=0;

delay(55); //delay

P1_2=1;

delay(55); //delay

}

}

}

//sub function || display a char

void wdchar(unsigned char i) //write a char

{

unsigned char xdata j;

P1_0=1;

P1_1=0;

j=0x8000;

j=i;

while (wtbusy())

{}

}

void wcchar(unsigned char d) //write a command char

{

unsigned char xdata j;

P1_0=0;

P1_1=0;

j=0x8000;

j=d;

while (wtbusy())

{}

}

char wtbusy() //wait busy sign

{

unsigned char xdata j;

P1_0=0;

P1_1=1;

j=0x8000;

if(j&0x80)

{

return TURE;

}

else

{

return FORSE;

}

}

//clear screen

void clrscr()

{

wcchar(LCD_CLS);

}

//initial time0

void initime0()

{

TL0=TML;

TH0=TMH;

TR0=TURE;

IE=0x93; //Enable T0 and Serial Port

}

//sub function time delay

void delay(unsigned char i)

{

counter=i;

while (counter)

{}

}

unsigned char crc8(unsigned char pData,unsigned char count)

{

// unsigned char crc;

crc = 0;

while (count-- > 0)

{

crc ^= pData++;

}

return crc;

}

char calc_decascii(char num)

// A rather messy function to convert a floating

// point number into an ASCII string

{ long data temp = num;

char data arrayptr = &outputbuffer[MAX_DISPLAY_CHAR];

long data divisor = 10;

long data result;

char data remainder,asciival;

int data i;

// If the result of the calculation is zero

// insert a zero in the buffer and finish

if (!temp)

{ arrayptr = 48;

goto done;

}

// Handle Negative Numbers

if (temp < 0)

{ outputbuffer[0] = '-';

temp -= 2temp;

}

for (i=0 ; i < sizeof(outputbuffer) ; i++)

{ remainder = temp % divisor;

result = temp / divisor;

// If we run off the end of the number insert a space into

// the buffer

if ((!remainder) && (!result))

{ arrayptr = ' ';}

// We're in business - store the digit offsetting

// by 48 decimal to account for the ascii value

else

{ asciival = remainder + 48;

arrayptr = asciival;

}

temp /= 10;

// Save a place for a negative sign

if (arrayptr != &outputbuffer[1]) arrayptr--;

}

done: return outputbuffer;

}

我有 at89s52 的键盘 和1602初始化程序，你可以组装一下，

STC12C5A08AD单片机和at89s52 差不多。

#include<at89x52h>

#include<intrinsh>

sbit d_i=P1^0;

sbit r_w=P1^1;

sbit e=P1^2;

#define uchar unsigned char

#define nop _nop_()

void delay(unsigned int ttt) // 长延时，ttt为延时的mS数

{

unsigned int aaa;

while(ttt--) // 延时约1mS

{

aaa=89;

while(aaa--);

}

}

void wcom(uchar cmd);

void wddr(uchar dat);

void checkbusy();

void lcd_init();

void display();

void main()

{

delay(40);

lcd_init();

while(1){

display();}

}

void lcd_init()

{

delay(15);

wcom(0x01);

delay(5);

wcom(0x38);

delay(5);

wcom(0x38);

delay(10);

wcom(0x0c);

delay(5);

wcom(0x06);

delay(5);

wcom(0x01);

delay(5);

}

void wcom(uchar cmd)

{

checkbusy();

d_i=0;

r_w=0;

e=0;

P0=cmd;

nop;

nop;

nop;

nop;

e=1;

nop;

nop;

nop;

nop;e=0;

}

void wddr (uchar dat)

{

checkbusy();

d_i=1;

r_w=0;

e=0;

P0=dat;

nop;nop;

nop;nop;

e=1;

nop;nop;

nop;nop;

e=0;

}

void checkbusy ()

{ bit result;

d_i=0;

r_w=1;

P0=0xff;

e=0;

nop;nop;

e=1;

nop;

nop;nop;

nop;

do {delay(1);

result = (bit)(P0&0x80);}

while(result!=0);

e=0;}

void display()

{// wcom(0x80);

wddr(0x61);

delay(100);

}

/取键值函数/

uchar keyscan()

{

uchar hang=0x00,lie=0x01,i=0x00;

uchar lcode,hcode;

uchar keynumber=0xff;

P2=0xf0;

if((P2&0xf0)!=0xf0)

{

delay(15); //去抖动

if((P2&0xf0)!=0xf0)

{

hcode=0xfe; //从第一行开始查

while((hcode&0x10)!=0)

{ P2=hcode;

if((P2&0xf0)!=0xf0)

{

lcode=(P2&0xf0)|0x0f;

//nop;nop;nop;nop;

//shortdelay(2);

lcode=(~lcode)>>4;

while(lie!=lcode) //判断在第几列（通过移动到某一位，是否匹配）

{ lie=lie<<1; //变量移动后要赋值

i++;

}

lie=i;

keynumber=hang4+lie;// 键值

//shortdelay(5); //开始程序不健壮，加上延时就可以稳定显示了，现在去掉也没问题

// nop;nop;nop;nop;

return (keynumber);

//break; //当初以为返回值后，不能跳出故加上；现在也可去掉

}

else

{

hcode=(hcode<<1)|0x01;

hang++;//下一次扫描第hang行，行值

}

}

}

}

else return (keynumber);

}

你这个接线就不合理 引脚4、5、6是控制端竟然没接给你个图参考

再给你一个仿真中的接线图和程序 你自己试试看

程序：

RS EQU P37

RW EQU P36

E EQU P35

mov p3,#0ffh

MOV P1,#01H ;清除屏幕

ACALL ENABLE

MOV P1,#38H ;8位点阵

ACALL ENABLE

MOV P1,#0FH ;开显示

ACALL ENABLE

MOV P1,#06H ;移动光标

ACALL ENABLE

MOV P1,#80H ;显示位置

ACALL ENABLE

l3: mov p1,#01h

acall enable

mov dptr,#table1 ;送第一句话

call write1

call enable

MOV P1,#0C0H ;写入显示起始地址（第二行第一个位置）

ACALL ENABLE ;调用写入命令子程序

call write1

call enable

mov p1,#01h

call delay1

call delay1

call delay1

jmp l3

ENABLE: ;送命令

CLR RS

CLR RW

CLR E

ACALL DELAY

SETB E

RET

write1: ;送字符串

mov r1,#00h

a1:mov a,r1

movc a,@a+dptr

call write2

inc r1

cjne a,#00h,a1 ;以00H做字符串结束标志

ret

write2: ;送单个字符

mov p1,a

setb rs

clr rw

clr e

call delay

setb e

ret

delay: ;延时子程序

mov r7,#255

d1:mov r6,#255

d2:djnz r6,d2

djnz r7,d1

ret

delay1:

mov r7,#255

delay2:mov r6,#255

djnz r6,$

djnz r7,delay2

ret

table1: db 20h,20h,20h,57h,45h,4ch,43h,4fh,4dh,45h,20h,54h,4fh,20h,20h,20h,20h,00h

table2: db 20h,57h,57h,57h,2Eh,4dh,43h,55h,39h,39h,2Eh,43h,4Fh,4Dh,20h,20h,20h,00h

end

给你推荐一本书《MCS51单片机应用设计》哈尔滨工业大学出版社，里面很详细的

#include "reg52h"

#include "intrinsh"

unsigned char text1[] = "TTT TTTT add:qhd" ;

unsigned char text2[] = "TEL:13333333333 " ;

sbit RS = P2^0;

sbit RW = P2^1;

sbit EN = P1^2;

void delay_ms(unsigned char t);

void init_1602(void);

void write_command(unsigned char cmd);

void write_data(unsigned char dat);

void dsp_onechar(unsigned char pos,unsigned char c);

void dsp_string(unsigned char line,unsigned char p,unsigned char length);

void main(void)

{

init_1602();

delay_ms(15);

dsp_string(0,text1,16);

dsp_string(1,text2,16);

while(1);

}

void delay_ms(unsigned char t)//毫秒延时大约延时1ms

{

unsigned char i;

while(t--)

{

for(i=0;i<112;i++);

}

}

void write_command(unsigned char cmd)//写指令函数（按规定RS=0，RW=0为写指令）

{

delay_ms(5); // check busy flag

EN = 0;

RS = 0;

RW = 0;

_nop_();

EN = 1;

P0 = cmd;

EN = 0;

}

void write_data(unsigned char dat)//往1602写数据

{

delay_ms(5); //busy flag check

EN = 0;

RS = 1;

RW = 0;

_nop_();

EN = 1;

P0 = dat;

EN = 0;

RS = 0;

}

void dsp_onechar(unsigned char pos,unsigned char c)//写一个字节函数

{

unsigned char p;

if (pos>=0x10)

p=pos+0xb0;

else

p=pos+0x80;

write_command(p);

write_data(c);

}

void dsp_string(unsigned char line,unsigned char p,unsigned char length)

{

unsigned char l,i;

l=line<<4;

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

dsp_onechar(l++,(p+i));

}

void init_1602(void)//1602初始化

{

delay_ms(15);

write_command(0x38);

write_command(0x38);

write_command(0x38);

write_command(0x06);

write_command(0x0c);

write_command(0x01);

}

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