clude "intrins.h"

sbit io_LCD12864_RS = P1^0

sbit io_LCD12864_RW = P1^1

sbit io_LCD12864_EN = P1^2

#define io_LCD12864_DATAPORT P0

#define SET_DATAio_LCD12864_RS = 1

#define SET_INC io_LCD12864_RS = 0

#define SET_READ io_LCD12864_RW = 1

#define SET_WRITE io_LCD12864_RW = 0

#define SET_EN io_LCD12864_EN = 1

#define CLR_EN io_LCD12864_EN = 0

void v_Lcd12864CheckBusy_f( void ) //忙检测函数

{

unsigned int nTimeOut = 0

SET_INC

SET_READ

CLR_EN

SET_EN

while( ( io_LCD12864_DATAPORT &0x80 ) &&( ++nTimeOut != 0 ) )

CLR_EN

SET_INC

SET_READ

}

void v_Lcd12864SendCmd_f( unsigned char byCmd ) //发送命令

{

v_Lcd12864CheckBusy_f()

SET_INC

SET_WRITE

CLR_EN

io_LCD12864_DATAPORT = byCmd

_nop_()

_nop_()

SET_EN

_nop_()

_nop_()

CLR_EN

SET_READ

SET_INC

}

void v_Lcd12864SendData_f( unsigned char byData ) //发送数据

{

v_Lcd12864CheckBusy_f()

SET_DATA

SET_WRITE

CLR_EN

io_LCD12864_DATAPORT = byData

_nop_()

_nop_()

SET_EN

_nop_()

_nop_()

CLR_EN

SET_READ

SET_INC

}

void v_DelayMs_f( unsigned int nDelay ) //延时

{

unsigned int i

for( nDelay >0 nDelay-- )

{

for( i = 125 i >0 i-- )

}

}

void v_Lcd12864Init_f( void ) //初始化

{

v_Lcd12864SendCmd_f( 0x30 ) //基本指令集

v_DelayMs_f( 50 )

v_Lcd12864SendCmd_f( 0x01 ) //清屏

v_DelayMs_f( 50 )

v_Lcd12864SendCmd_f( 0x06 ) //光标右移

v_DelayMs_f( 50 )

v_Lcd12864SendCmd_f( 0x0c )//开显示

}

void v_Lcd12864SetAddress_f( unsigned char x, y )//地址转换

{

unsigned char byAddress

switch( y )

{

case 0 : byAddress = 0x80 + x

break

case 1 : byAddress = 0x90 + x

break

case 2 : byAddress = 0x88 + x

break

case 3 : byAddress = 0x98 + x

break

default :

break

}

v_Lcd12864SendCmd_f( byAddress )

}

void v_Lcd12864PutString_f( unsigned char x, unsigned char y, unsigned char *pData )

{

v_Lcd12864SetAddress_f( x, y )

while( *pData != '\0' )

{

v_Lcd12864SendData_f( *pData++ )

}

}

void main( void )

{

v_Lcd12864Init_f()

v_Lcd12864PutString_f( 0,0, "快乐随行")

v_Lcd12864PutString_f( 2,1, "分都不给")

v_Lcd12864PutString_f( 0,2, "*LCD12864ST7920*")

v_Lcd12864PutString_f( 0,3, "辛苦回答了半天")

while( 1 )

}

标准的一般都是这个程序

#include <reg52.h>

#include <math.h>

#define lcd_data P1

sbit cs1=P2^3

sbit cs2=P2^4

sbit di=P2^0

sbit rw=P2^1

sbit e=P2^2

void delay(int t)

{

int i,j,k

for(i=0i<ti++)

{ for(j=0j<255j++)

k++}

}

void write_com_l(unsigned int command)

{

cs1=1

rw=0

di=0

lcd_data=command

e=1

e=0

cs1=0

}

void write_data_l(unsigned int data0)

{

cs1=1

rw=0

di=1

lcd_data=data0

e=1

e=0

cs1=0

}

void write_com_r(unsigned int command)

{

cs2=1

rw=0

di=0

lcd_data=command

e=1

e=0

cs2=0

}

void write_data_r(unsigned int data0)

{

cs2=1

rw=0

di=1

lcd_data=data0

e=1

e=0

cs2=0

}

void disp0()

{

unsigned int i,j

for (i=0i<8i++)

{write_com_l(0xb8+i)

write_com_r(0xb8+i)

write_com_l(0x40)

write_com_r(0x40)

for (j=0j<64j++)

{write_data_l(0xaa)

write_data_r(0xaa)

}

}

}

void disp1()

{

unsigned int i,j

for (i=0i<8i++)

{write_com_l(0xb8+i)

write_com_r(0xb8+i)

write_com_l(0x40)

write_com_r(0x40)

for (j=0j<64j++)

{write_data_l(0x55)

write_data_r(0x55)

}

}

}

void disp2()

{

unsigned int i,j

for (i=0i<8i++)

{write_com_l(0xb8+i)

write_com_r(0xb8+i)

write_com_l(0x40)

write_com_r(0x40)

for (j=0j<64j++)

{write_data_l(0x0f)

write_data_r(0x0f)

}

}

}

void disp3()

{

unsigned int i,j

for (i=0i<8i++)

{write_com_l(0xb8+i)

write_com_r(0xb8+i)

write_com_l(0x40)

write_com_r(0x40)

for (j=0j<64j++)

{write_data_l(0xf0)

write_data_r(0xf0)

}

}

}

void init_lcd() //初始化LCD清屏

{

write_com_l(0x3e)

write_com_r(0x3e)

write_com_l(0x3f)

write_com_r(0x3f)

write_com_l(0xc0)

write_com_r(0xc0)

write_com_l(0xb8)

write_com_r(0xb8)

write_com_l(0x40)

write_com_r(0x40)

for(1)

{

disp0()

delay(0x0ff)

disp1()

delay(0x0ff)

disp2()

delay(0x0ff)

disp3()

delay(0x0ff)

}

}

void main()

{

IE=0x81

init_lcd()

}

void innt0 () interrupt 0

{

do {}while(1)

}

一行的显示位置的地址只有八个，就是每个汉字的开始位置，但是可以通过加显空白的方式将字母从一个汉字的第二字节的位置上开始显示。注意，这个方法只是用于单字节字符和字母显示，不适合汉字以及其它双字节字符显示。

---