linux-c/51/液晶显示/液晶.c

#include<reg51.h>
#include<intrins.h>
sbit RS=P3^0;
sbit RW=P3^1;                    
sbit E= P3^2;                    
void lcd_w_cmd(unsigned char com);
void lcd_w_dat(unsigned char dat);  
unsigned char lcd_r_start();      
void lcd_init();              
void delay100us(unsigned char t);    
void delay5us(unsigned char n);    
void main()              
{
unsigned char Disp[]="Hello Everyone";
unsigned char i;
P1=0xff;                          
lcd_init();                      
delay100us(255);
lcd_w_cmd(0x82);                  
delay100us(255);
for(i=0;i<14;i++)                  
{                  
lcd_w_dat(Disp[i]);
delay100us(200);
}
while(1);                      
}

void delay100us(unsigned char t)    
{
unsigned char j,i;
for(i=0;i<t;i++)
for(j=0;j<10;j++);
}

void delay5us(unsigned char n)
{   do
{
_nop_();
_nop_();
_nop_();
n--;
}
while(n);
}

void lcd_init()          
{
lcd_w_cmd(0x3c);
lcd_w_cmd(0x0c);	
lcd_w_cmd(0x01);              
lcd_w_cmd(0x06);            
lcd_w_cmd(0x80);              
}

unsigned char lcd_r_start()        
{
unsigned char s;
RW=1;              
delay5us(1);
RS=0;
delay5us(1);
E=1;            
delay5us(1);
s=P1;            
delay5us(1);
E=0;
delay5us(1);
RW=0;
delay5us(1);
return(s);        
}

void lcd_w_cmd(unsigned char com)  
{
unsigned char i;
do{                    
i=lcd_r_start();    
i=i&0x80;                
delay100us(2);
}while(i!=0);            
RW=0;
delay5us(1);
RS=0;            
delay5us(1);
E=1;            
delay5us(1);
P1=com;          
delay5us(1);
E=0;
delay5us(1);
RW=1;
delay100us(255);
}

void lcd_w_dat(unsigned char dat)  
{
unsigned char i;
do{                  
i=lcd_r_start();    
i=i&0x80;                  
delay100us(2);          
}while(i!=0);                
RW=0;
delay5us(1);
RS=1;            
delay5us(1);
E=1;          
delay5us(1);
P1=dat;          
delay5us(1);
E=0;
delay5us(1);
RW=1;
delay100us(255);
}