/* 用法：
   LCD_init();
   LCD_write_string(列,行,"字符串");
   LCD_write_char(列,行,'字符'); 
 ---------------------------------------------------------------
下面是AVR與LCD連接信息
PC4 ->RS
PC5 ->EN
地  ->RW
PC0 ->D4
PC1 ->D5
PC2 ->D6
PC3 ->D7
要使用本驅動，改變下面配置信息即可
-----------------------------------------------------------------*/
#define LCD_EN_PORT    PORTC   //以下2個要設為同一個口
#define LCD_EN_DDR     DDRC
#define LCD_RS_PORT    PORTC   //以下2個要設為同一個口
#define LCD_RS_DDR     DDRC
#define LCD_DATA_PORT  PORTA   //以下3個要設為同一個口
#define LCD_DATA_DDR   DDRA    //默認情況下連線必須使用高四位端口,如果不是請注意修改
#define LCD_DATA_PIN   PINA
#define LCD_RS         (1<<PC6) //0x20   portC6       out
#define LCD_EN         (1<<PC7) //0x40   portC7       out
#define LCD_DATA       ((1<<PA4)|(1<<PA5)|(1<<PA6)|(1<<PA7)) //0xf0   portA 4/5/6/7 out
/*--------------------------------------------------------------------------------------------------
函數說明
--------------------------------------------------------------------------------------------------*/
void LCD_init(void);
void LCD_en_write(void);
void LCD_write_command(unsigned  char command) ;
void LCD_write_data(unsigned char data);
void LCD_set_xy (unsigned char x, unsigned char y);
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data);

//-----------------------------------------------------------------------------------------

#include <macros.h>
#include "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_nus(40);
  LCD_write_command(0x28);  //4位顯示
  LCD_write_command(0x0c);  //顯示開
  LCD_write_command(0x01);  //清屏
  delay_nms(2);
  

  
}

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

void LCD_write_command(unsigned char command) //寫指令
{
  //連線為高4位的寫法
  delay_nus(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();
 
/*
  //連線為低四位的寫法
  delay_nus(16);
  LCD_RS_PORT&=~LCD_RS;        //RS=0
  LCD_DATA_PORT&=0xf0;         //清高四位
  LCD_DATA_PORT|=(command>>4)&0x0f; //寫高四位
  LCD_en_write();
  LCD_DATA_PORT&=0xf0;         //清高四位
  LCD_DATA_PORT|=command&0x0f; //寫低四位
  LCD_en_write(); 
*/
  
}

void LCD_write_data(unsigned char data) //寫數據
{
  //連線為高4位的寫法
  delay_nus(16);
  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();
  
/*
  //連線為低四位的寫法 
  delay_nus(16);
  LCD_RS_PORT|=LCD_RS;       //RS=1
  LCD_DATA_PORT&=0Xf0;       //清高四位
  LCD_DATA_PORT|=(data>>4)&0x0f;  //寫高四位
  LCD_en_write();
 
  LCD_DATA_PORT&=0Xf0;        //清高四位
  LCD_DATA_PORT|=data&0x0f;   //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);
  
}