/*----------------------------------------------------
液晶LCD1602C  使用4條數據線(D4~D7)
編譯器：ICC-AVR v6.31A 日期: 2005-11-24 20:29:57
目標芯片 : M16
時鐘: 8.0000Mhz
作者：archeng504
---------------------------------------------------*/
#include "LCD.h"
#include"util/delay.h"



void LCD_init(void)         //液晶初始化
{
  LCD_DATA_DDR|=LCD_DATA;   //數據口方向為輸出
  LCD_EN_DDR|=LCD_EN;       //設置EN方向為輸出
  LCD_RS_DDR|=LCD_RS;       //設置RS方向為輸出
  LCD_write_command(0x28); 
  LCD_en_write();
  _delay_us(40);
  LCD_write_command(0x28);  //4位顯示
  LCD_write_command(0x0c);  //顯示開
  LCD_write_command(0x01);  //清屏
 // LCD_write_command(0x1c);
  _delay_ms(2);
}

void LCD_en_write(void)  //液晶使能
{
  LCD_EN_PORT|=LCD_EN;
  _delay_us(1);
  LCD_EN_PORT&=~LCD_EN;
}

void LCD_write_command(unsigned char command) //寫指令
{
  _delay_us(16);
  LCD_RS_PORT&=~LCD_RS;        //RS=0
  LCD_DATA_PORT&=0X0f;         //清高四位
  LCD_DATA_PORT|=command&0xf0; //寫高四位
  LCD_en_write();
  command=command<<4;          //低四位移到高四位
  LCD_DATA_PORT&=0x0f;         //清高四位
  LCD_DATA_PORT|=command&0xf0; //寫低四位
  LCD_en_write();
  
}

void LCD_write_data(unsigned char data) //寫數據
{
  _delay_us(1000);
  LCD_RS_PORT|=LCD_RS;       //RS=1
  LCD_DATA_PORT&=0X0f;       //清高四位
  LCD_DATA_PORT|=data&0xf0;  //寫高四位
  LCD_en_write();
  data=data<<4;               //低四位移到高四位
  LCD_DATA_PORT&=0X0f;        //清高四位
  LCD_DATA_PORT|=data&0xf0;   //寫低四位
  LCD_en_write();
}


void LCD_set_xy( unsigned char x, unsigned char y )  //寫地址函數
{
    unsigned char address;
    if (y==0) address=0x80+x;
    else   address=0xc0+x;
    LCD_write_command(address);
}
  
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) //列x=0~15,行y=0,1
   {
    LCD_set_xy( X, Y ); //寫地址    
    while (*s)  // 寫顯示字符
    {
      LCD_write_data(*s);
      s++;
    }
      
}

void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data) //列x=0~15,行y=0,1
{
  LCD_set_xy( X, Y ); //寫地址
  LCD_write_data(data);
  
}