#ifndef __LCD_H__
#define __LCD_H__

/*---------------------------------------------------------
                   LCD數據、控制口定義
---------------------------------------------------------*/
#define LCD_DATA P1        //LCD的數據口

sbit LCD_BUSY=LCD_DATA^7;  //LCD忙信號位
sbit LCD_RS=P2^0;          //LCD讀寫控制
sbit LCD_RW=P2^1;          //LCD寄存器選擇
sbit LCD_EN=P2^2;          //LCD使能信號

#endif

#define LCD_GO_HOME               0x02         //AC=0，光標、畫面回HOME位

//輸入方式設置
#define LCD_AC_AUTO_INCREMENT     0x06         //數據讀、寫操作后，AC自動增一
#define LCD_AC_AUTO_DECREASE      0x04         //數據讀、寫操作后，AC自動減一
#define LCD_MOVE_ENABLE           0x05         //數據讀、寫操作，畫面平移
#define LCD_MOVE_DISENABLE        0x04         //數據讀、寫操作，畫面不動

//設置顯示、光標及閃爍開、關
#define LCD_DISPLAY_ON            0x0C         //顯示開
#define LCD_DISPLAY_OFF           0x08         //顯示關
#define LCD_CURSOR_ON             0x0A         //光標顯示
#define LCD_CURSOR_OFF            0x08         //光標不顯示
#define LCD_CURSOR_BLINK_ON       0x09         //光標閃爍
#define LCD_CURSOR_BLINK_OFF      0x08         //光標不閃爍

//光標、畫面移動，不影響DDRAM
#define LCD_LEFT_MOVE             0x18         //LCD顯示左移一位
#define LCD_RIGHT_MOVE            0x1C         //LCD顯示右移一位
#define LCD_CURSOR_LEFT_MOVE      0x10         //光標左移一位
#define LCD_CURSOR_RIGHT_MOVE     0x14         //光標右移一位

//工作方式設置
#define LCD_DISPLAY_DOUBLE_LINE   0x38         //兩行顯示
#define LCD_DISPLAY_SINGLE_LINE   0x30         //單行顯示

void LCD_check_busy(void)   //檢測LCD狀態，看它是不是還在忙呢
{
 while(1)
  {
   LCD_EN=0;
   LCD_RS=0;
   LCD_RW=1;
   LCD_DATA=0xff;
   LCD_EN=1;
   if(!LCD_BUSY)break;
  }
 LCD_EN=0;
}

void LCD_cls(void)          //LCD清屏
{
 
 LCD_check_busy();
 LCD_RS=0;
 LCD_RW=0;
 LCD_DATA=1;
 LCD_EN=1;
 LCD_EN=0;
 
}

void LCD_write_instruction(unsigned char LCD_instruction)   //寫指令到LCD
{
  LCD_check_busy();
 LCD_RS=0;
 LCD_RW=0;
 
 LCD_DATA=LCD_instruction;
 LCD_EN=1;
 LCD_EN=0;
 }

void LCD_write_data(unsigned char LCD_data)      //輸出一個字節數據到LCD
{
  LCD_check_busy();
 LCD_RS=1;
 LCD_RW=0;
 
 LCD_DATA=LCD_data;
 LCD_EN=1;
 LCD_EN=0;
 }
 
void LCD_set_position(unsigned char x)            //LCD光標定位到x處
{
 LCD_write_instruction(0x80+x);
}


/*void LCD_go_home(void)                         //LCD光標歸位
{
 LCD_write_instruction(LCD_GO_HOME);
}*/


void LCD_printc(unsigned char lcd_data)          //輸出一個字符到LCD
{
 LCD_write_data(lcd_data);
}

void LCD_prints(unsigned char *lcd_string)       //輸出一個字符串到LCD
{
 unsigned char i=0;
 while(lcd_string[i]!=0x00)
  {
   LCD_write_data(lcd_string[i]);
   i++;
  } 
}

void LCD_initial(void)                        //初始化LCD
{
 LCD_write_instruction(LCD_AC_AUTO_INCREMENT|LCD_MOVE_DISENABLE);
 LCD_write_instruction(LCD_DISPLAY_ON|LCD_CURSOR_OFF);
 LCD_write_instruction(LCD_DISPLAY_DOUBLE_LINE);
 LCD_cls();
}