这是12864型lcd的驱动和测试程序，采用并行方式。LCD型号是：JM12864M，支持串、并两种接口
//FileName:12864lcdp.h
/*************************************
** start51 study board test software
** test 12864LCD
** using parallel interface
** author:bluehacker<kernelpaniccrash AT gmail.com>
** QQ:282074921
** Date:2007-11-17
**************************************/
#ifndef _LZP_START51_12864LCDP_H
#define _LZP_START51_12864LCDP_H
#include "reg52.h"
//设置波特率
#define OSC_FREQ 11059200L
#define BAUD_115200 256 - (OSC_FREQ/192L)/115200L // 255
#define BAUD_57600 256 - (OSC_FREQ/192L)/57600L // 254
#define BAUD_38400 256 - (OSC_FREQ/192L)/38400L // 253
#define BAUD_28800 256 - (OSC_FREQ/192L)/28800L // 252
#define BAUD_19200 256 - (OSC_FREQ/192L)/19200L // 250
#define BAUD_14400 256 - (OSC_FREQ/192L)/14400L // 248
#define BAUD_9600 256 - (OSC_FREQ/192L)/9600L // 244
#define LCD_DATA P0
sbit LCDRS="P2"^0;
sbit LCDRW="P2"^1;
sbit LCDE="P2"^2;
//12864LCD指令定义
#define CMD_CLEAR 0x01
#define CMD_RESET 0x02
void Delay_us(unsigned char nUs);
void Delay_ms(unsigned int nMs);
void lcd_busy(void);
void write_command(unsigned char cmd);
unsigned char read_data(void);
void write_data(unsigned char dat);
void clear_lcd();
void lcd_init();
void lcd_setxy(unsigned char x,unsigned char y);
void lcd_display_str(unsigned char x, unsigned char y,unsigned char *str);
#endif
//FileName:delay.c
/********************************************
** start51 study board
** delay function implementation
** author:bluehacker<kernelpaniccrash AT gmail.com>
** QQ:282074921
**********************************************/
#include "12864lcdp.h"
void Delay_us(unsigned char nUs)//微秒级延时<255us
{
TH0=0;
TL0=0;
TR0=1;
while(TL0<nUs)//利用T0做定时计数器，循环采样，直到达到定时值
{
}
TR0=0;
}
void Delay_ms(unsigned int nMs)//豪秒级的延时<65535ms
{
unsigned int cnt="0";
TR0=1;
while(cnt<nMs)////利用T0做定时计数器，循环采样，直到达到定时值
{
TH0=0;
TL0=20;
while(TH0<4)
{
}
cnt++;
}
TR0=0;
}
//FileName:12864lcdp.c
/*************************************
** start51 study board test software
** test 12864LCD
** using parallel interface
** author:bluehacker<kernelpaniccrash AT gmail.com>
** QQ:282074921
** Date:2007-11-17
**************************************/
#include "12864lcdp.h"
void lcd_busy(void)
{
unsigned char dat="0";
LCDRS=0;
LCDRW=1;
LCDE=0;
do{
LCD_DATA=0xff;
LCDE=1;
dat=LCD_DATA;
LCDE=0;
}while(dat&0x80);
}
void write_command(unsigned char cmd)
{
lcd_busy();
LCDRS=0;
LCDRW=0;
LCD_DATA=cmd;
LCDE=1;
Delay_us(1);
LCDE=0;
}
unsigned char read_data(void)
{
unsigned char dat;
lcd_busy();
LCDRS=1;
LCDRW=1;
LCDE=1;
Delay_us(1);
dat=LCD_DATA;
LCDE=0;
return dat;
}
void write_data(unsigned char dat)
{
lcd_busy();
LCDRS=1;
LCDRW=0;
LCD_DATA=dat;
LCDE=1;
Delay_us(1);
LCDE=0;
}
void clear_lcd()
{
write_command(CMD_CLEAR);
}
void lcd_setxy(unsigned char x,unsigned char y)
{
unsigned char addr;
switch(y)
{
case 0:
addr=0x80+x;
break;
case 1:
addr=0x90+x;
break;
case 2:
addr=0x88+x;
break;
case 3:
addr=0x98+x;
break;
}
write_command(addr);
}
void lcd_display_str(unsigned char x, unsigned char y,unsigned char *str)
{
unsigned char i;
lcd_setxy(x,y);
for(i=0;str!='\0';i++)
{
write_data(str);
}
}
void lcd_init()
{
write_command(CMD_RESET);
write_command(0x0d);//设置显示状态，整体显示ON,游标与游标位置ON
write_command(0x30);//功能设置，基本指令
write_command(0x18);//游标与显示移位控制
clear_lcd();
//write_command(0x80);//设置DDRAM位址,并不必须
}
void main()
{
TCON=0;
SCON=0x50;/*mode 1,1 start bit ,8 data bit ,1 stop bit,enable receive*/
PCON=0x80;/*SMOD=1, Baud Rate twice*/
TMOD=0x21;/*timer 0--mode 1 and timer 1 ---mode2*/
//set baud rate,use timer 1 as baud rate generator
TH1=BAUD_19200;
TL1=TH1;
TR1=1;
// ET1=0;//disable timer 1 interrupt
EA=0;
lcd_init();
//显示武林外传
lcd_setxy(1,2);
write_data(0xce);
write_data(0xe4);
lcd_setxy(2,2);
write_data(0xc1);
write_data(0xd6);
lcd_setxy(3,2);
write_data(0xcd);
write_data(0xe2);
lcd_setxy(4,2);
write_data(0xb4);
write_data(0xab);
Delay_ms(5000);
clear_lcd();
write_command(CMD_RESET);
Delay_ms(5000);
lcd_display_str(1,0,"bluehacker");
lcd_display_str(0,1,"QQ:282074921");
lcd_display_str(3,2,"李正平");
while(1)
{
}
}
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