分享一个89C51驱动st7920的例子，亲测可用。
lcd12864.h 文件；#ifndef __LCD12864_H__
#define __LCD12864_H__
#include <reg52.h>
#include <intrins.h>
sbit RS = P0 ^ 0;
sbit RW = P0 ^ 1;
sbit EN = P0 ^ 2;
sbit PSB = P3 ^ 0;
sbit RST = P3 ^ 1;
#define _NOP() _nop_()
/* 12864 ?????? */
#define RS_CLR RS = 0 /* RS ?? */
#define RS_SET RS = 1 /* RS ?? */
#define RW_CLR RW = 0 /* RW ?? */
#define RW_SET RW = 1 /* RW ?? */
#define EN_CLR EN = 0 /* E ?? */
#define EN_SET EN = 1 /* E ?? */
#define PSB_CLR PSB = 0 /* PSB ??,???? */
#define PSB_SET PSB = 1 /* PSB ??,???? */
#define RST_CLR RST = 0 /* RST ?? , ??? */
#define RST_SET RST = 1 /* RST ?? */
/* 12864 ?????? */
#define DataPort P2 /*??? */
#define LcdData P2
void Delay_1ms( void );
void Delay_Nms( unsigned int n );
void LCD_write_com( unsigned char cmd );
void LCD_write_data( unsigned char dat );
void Ini_Lcd( void );
void Lcd_WriteStr( unsigned char x, unsigned char y, unsigned char *Str );
unsigned char Lcd_CheckBusy( void );
unsigned char Lcd_ReadData( void );
#endif
lcd12864.c 文件；
#include "LCD12864.h"
void delay_us( unsigned int t ) /* @11.0592MHz */
{
while ( t-- ) {
_nop_();
_nop_();
_nop_();
}
}
void delay_ms( unsigned int t ) /* @11.0592MHz */
{
unsigned char i, j;
while ( t-- ) {
_nop_();
_nop_();
_nop_();
i = 11;
j = 190;
do {
while ( --j )
;
} while ( --i );
}
}
void Delay_1ms( void )
{
delay_ms( 1 );
}
/*
* ***********************************************************************
*?????????
* ***********************************************************************
*/
void LCD_write_com( unsigned char cmd )
{
while ( Lcd_CheckBusy() ) {}
RS_CLR;
RW_CLR;
EN_SET;
DataPort = cmd;
EN_CLR;
}
/*
* ***********************************************************************
*?????????
* ***********************************************************************
*/
void LCD_write_data( unsigned char dat )
{
while ( Lcd_CheckBusy() )
;
RS_SET;
RW_CLR;
EN_SET;
DataPort = dat;
/* delay_us( 1 ); */
EN_CLR;
}
/*
* *************************************************************************
* ??? IO ????
* *************************************************************************
*/
void Port_init_12864( void )
{
delay_ms( 50 );
PSB_SET; /*?????? */
RST_CLR;
delay_ms( 100 );
RST_SET;
}
/*******************************************
*????: Ini_Lcd
*? ?:???????
*? ?:?
*??? :?
********************************************/
void Ini_Lcd( void )
{
Port_init_12864(); /*??????????? */
LCD_write_com( 0x30 ); /*????? */
Delay_1ms();
LCD_write_com( 0x02 ); /*???? */
Delay_1ms();
LCD_write_com( 0x0c ); /*?????? , ???? */
Delay_1ms();
LCD_write_com( 0x01 ); /*???? */
Delay_1ms();
LCD_write_com( 0x06 ); /*???? */
Delay_1ms();
LCD_write_com( 0x80 ); /*????????? */
}
/*
* ***********************************************************************
*??????????????
* ***********************************************************************
*/
void Lcd_WriteStr( unsigned char x, unsigned char y, unsigned char *Str )
{
if ( (y > 3) || (x > 7) )
return; /*???????? */
if ( y == 0 ) {
LCD_write_com( 0x80 + x ); /*????? */
}
if ( y == 1 ) {
LCD_write_com( 0x90 + x ); /*????? */
}
if ( y == 2 ) {
LCD_write_com( 0x88 + x ); /*????? */
}
if ( y == 3 ) {
LCD_write_com( 0x98 + x ); /*????? */
}
delay_us( 1 );
while ( *Str > 0 ) {
LCD_write_data( *Str );
Str++;
delay_us( 1 );
}
}
unsigned char Lcd_CheckBusy( void )
{
unsigned char Busy;
RS_CLR;
RW_SET;
EN_SET;
delay_us( 5 );
Busy = LcdData & 0x80;
EN_CLR;
return(Busy);
}
/***********************************
*? LCD ?????
************************************/
unsigned char Lcd_ReadData( void )
{
unsigned char Temp;
while ( Lcd_CheckBusy() )
;
P0 = 0XFF;
RS_SET;
RW_SET;
EN_SET;
delay_us( 10 );
Temp = LcdData;
EN_CLR;
return(Temp);
}
main.c 文件
#include "reg52.h"
#include <intrins.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "LCD12864.h"
void main( void )
{
Ini_Lcd();
Lcd_WriteStr(0,0,"12345678");
while ( 1 )
{
}
}
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