lcd.h

基于单片机的程序设计

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char

sfr  db=0x80;
sbit rs=P2^0;
sbit rw=P2^1;
sbit en=P2^2;

// check whether the BF is busy or not //
uchar lcd_wait(void)
{
  rs=0;
  rw=1;  _nop_();
  en=1;  _nop_();
  while(db&0x80);
  en=0;
  return(db);
}

// write the data to lcd or read the directive from lcd //
#define lcd_command  0
#define lcd_data     1
#define lcd_clear_screen  0x01
#define lcd_homing        0x02
void lcd_write(bit byte,uchar inpute)
{
  rw=0;
  rs=byte;
  en=0;     _nop_();
  db=inpute; _nop_();
  en=1;     _nop_();
  en=0;     _nop_();
  lcd_wait();
}

// set display //
#define lcd_on        0x0c
#define lcd_off       0x08
#define lcd_cursor    0x0A
#define lcd_no_cursor 0x08
#define lcd_flash     0x09
#define lcd_no_flash  0x08
void lcd_setdisplay(uchar display)
{
  lcd_write(lcd_command,display);
}

// set input //
#define lcd_ac_up    0x06
#define lcd_ac_down  0x04
#define lcd_move     0x05
#define lcd_no_move  0x04
void lcd_setinput(uchar inputmode)
{
  lcd_write(lcd_command,inputmode);
}

// if the cursor move //
#define lcd_curson   0x02
#define lcd_screen   0x08
#define lcd_left     0x00
#define lcd_right    0x04
void lcd_movn(direction, object)
uchar direction,object;
{
  if(object==lcd_curson) 
    lcd_write(lcd_command,0x10|direction);
  if(object==lcd_screen)
    lcd_write(lcd_command,0x18|direction);
}
//  初始化lcd //
void lcd_initial(void)
{
  en=0;
  lcd_write(lcd_command,0x38);
  lcd_write(lcd_command,0x38);
  lcd_setdisplay(lcd_on|lcd_no_cursor);
  lcd_write(lcd_command,lcd_clear_screen);
  lcd_setinput(lcd_ac_up|lcd_no_move);
}

//  显示的位置 //
void gotoxy(uchar x,uchar y)
{
  if(y==0)
   lcd_write(lcd_command,0x80|x);
  if(y==1)
   lcd_write(lcd_command,0x80|(x-0x40));
}

// 输出 //
void print(uchar *str)
{
  while(*str!='\0')
  {
    lcd_write(lcd_data,*str);
    str++;
   }
}