lcd1602.c

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#include<at89x52.h>
#include <intrins.h>
#define uchar unsigned char
#define LCM_Data P1
 

sbit rs = P3^7; 
sbit rw = P3^6;
sbit ep = P3^4;

void delay_ms(unsigned int);

void lcd_wcmd(uchar);
void lcd_bz();
void lcd_pos(uchar);
void lcd_wdat(uchar);
void display(uchar,uchar *);

uchar code dis1[] = {" www.willar.com "};
uchar code dis2[] = {"WELCOME TO WEINA"};


void delay_ms(unsigned int i)
{
	unsigned char j;
	while (i--)
	{
		for( j=0;j<123;j++);
	}
}



void lcd_bz()
{       // ??LCD????
bit result;
LCM_Data |= 0x80 ;
	do
	{
		rs = 0;
		rw = 1;
		ep = 1;
		result = (bit)(LCM_Data & 0x80);////
		ep = 0;
	}while (result == 1);
}



void lcd_wcmd(uchar cmd)
{       // ???????LCD
 lcd_bz();
  rs = 0;
  rw = 0;
  ep = 0;
  LCM_Data = cmd;
  ep = 1;
  ep = 0;  
}

void lcd_pos(uchar pos)
{       //??????
 lcd_wcmd(pos | 0x80);
}

void lcd_wdat(uchar dat) 
{       //?????????LCD
 lcd_bz();
  rs = 1;
  rw = 0;
  ep = 0;
  LCM_Data = dat;
  ep = 1;
  ep = 0; 
}

void lcd_init()
{       //LCD?????
 delay_ms(15);
 lcd_wcmd(0x38);   //function set
 delay_ms(5);
 lcd_wcmd(0x38);   //function set
 delay_ms(5);
 lcd_wcmd(0x38);
 
 lcd_wcmd(0x38); 
 lcd_wcmd(0x08);   //display on/off
 lcd_wcmd(0x01);   //??LCD?????
  delay_ms(5);
 lcd_wcmd(0x06);   //entry mode set
 lcd_wcmd(0x0c);   //entry mode set

}

/*---------------
????:display()
?? :?LCD????????
?? :??????,??????
?? :lcd_wcmd(), lcd_pos()
????:pos ?????,q?????????????
??? :?
----------------*/
void display(uchar pos, uchar *q)
{ 
 uchar i;
 //lcd_wcmd(0x01); //clear 
 delay_ms(5);
 lcd_pos(pos);
 for(i=0;i<16;i++)
 {
  lcd_wdat(*q);
  q++;
 delay_ms(250);
 } 
}

main()
{
 //delay_ms(500);
 lcd_init();    // ???LCD   
 delay_ms(10);

 display(0x00,dis1);
 display(0x40,dis2);
 //display(0x14,dis1);
 //display(0x54,dis2);
 //lcd_wcmd(0x07);   //entry mode set
 //delay(1);
 while(1)
 { ;
  //display(0x00,dis1);
  //display(0x40,dis2);
  //display(0x14,dis1);
  //display(0x54,dis2);
 }
}