#include <avr/io.h>
#include <avr/delay.h>

//控制端口
#define LCD_CTRL_DDR  DDRB
#define LCD_CTRL_PORT PORTB
#define LCD_CTRL_PIN  PINB
#define LCD_RS   0X01
#define LCD_RW   0X02
#define LCD_EN   0X04
//读取类型
#define read_comm   0
#define read_data   1
//数据端口
#define LCD_DATA_DDR  DDRA
#define LCD_DATA_PORT PORTA
#define LCD_DATA_PIN  PINA

void lcd_init(void);                       //LCD初始化
void lcd_write_comm(unsigned char comm);  //写命令
void lcd_write_data(unsigned char data);  //写数据
void lcd_write_str(unsigned char x,unsigned char y,unsigned char *p);     //写字符串
unsigned char lcd_read_char(unsigned char read_type);  //读取
void lcd_posion(unsigned char x,unsigned char y);     //位置设定
void lcd_busy_chek(void);
void lcd_en_signal(void);

void lcd_init(void)
{   
   LCD_CTRL_PORT=0x00;
   LCD_CTRL_DDR= 0xff;   
   LCD_DATA_PORT=0X00;
   LCD_DATA_DDR=0XFF;   
   lcd_write_comm(0x3f); //功能设置,8位数据，两行显示，5X10  
   lcd_write_comm(0x06); //输入方式设置   
   lcd_write_comm(0x0f); //显示开关设置   
   lcd_write_comm(0x01); //清屏  
}

void lcd_write_comm(unsigned char comm)
{  
   lcd_busy_chek();
   
   LCD_CTRL_PORT&=~LCD_RW; //WRITE
   LCD_CTRL_PORT&=~LCD_RS; //RS=0
   
   LCD_DATA_PORT=comm;
   lcd_en_signal();
   
   LCD_CTRL_PORT^=LCD_RS; //CONVERSE RS
   LCD_CTRL_PORT^=LCD_RW; //WRITE
}

void lcd_posion(unsigned char x,unsigned char y)
{
    unsigned char address;
    if(y == 0) 
	   address = 0x80 + x; 
    else   
	   address = 0xc0 + x; 
    lcd_write_comm(address); 
}

void lcd_write_data(unsigned char data)
{
   lcd_busy_chek();
   
   LCD_CTRL_PORT&=~LCD_RW; //WRITE
   LCD_CTRL_PORT|=LCD_RS; //RS=0
   
   LCD_DATA_PORT = data;
   lcd_en_signal();
   
   LCD_CTRL_PORT^=LCD_RS; //CONVERSE RS
   LCD_CTRL_PORT^=LCD_RW; //WRITE
}

void lcd_write_str(unsigned char x,unsigned char y,unsigned char *p)  //写数据
{
   lcd_posion(x,y);
   
   while(*p)
   {
      lcd_write_data(*p);
	  p++;
   }

}

unsigned char lcd_read_char(unsigned char read_type)
{
    unsigned char temp;
	
	lcd_busy_chek();
	
    if(read_type==read_comm)   //read comm
	{
	   LCD_CTRL_PORT&=~LCD_RS;
	}
	else                      //read data
	{
	   LCD_CTRL_PORT|=LCD_RS;
	}
	LCD_CTRL_PORT|=LCD_RW; //read
	
	lcd_en_signal();
    temp=LCD_DATA_PIN;
	
	LCD_CTRL_PORT^=LCD_RW; //CONVERSE RW
	LCD_CTRL_PORT^=LCD_RS; //CONVERSE RS
	
	return temp;
}

void lcd_busy_chek(void)
{
   LCD_DATA_DDR  = 0X00;
   LCD_DATA_PORT = 0XFF;
   
   LCD_CTRL_PORT&=~LCD_RS;
   LCD_CTRL_PORT|=LCD_RW; //read
   
   //为什么这里换成函数lcd_en_signal()却不行？？？
   LCD_CTRL_PORT&=~LCD_EN;
   _delay_us(1);
   LCD_CTRL_PORT|=LCD_EN;
   _delay_us(1);
   LCD_CTRL_PORT&=~LCD_EN; 
   while( LCD_DATA_PIN&0X80 )
   {
      LCD_CTRL_PORT&=~LCD_EN;
      _delay_us(1);
      LCD_CTRL_PORT|=LCD_EN;
      _delay_us(1);
      LCD_CTRL_PORT&=~LCD_EN; 
   }
   /*
    lcd_en_signal();
    while( LCD_DATA_PIN&0X80 )
    {
       lcd_en_signal();
    }
   */
   //为什么这里换成函数lcd_en_signal()却不行？？？
   
   LCD_CTRL_PORT^=LCD_RW; //CONVERSE RW
   LCD_CTRL_PORT^=LCD_RS; //CONVERSE RS
   
   LCD_DATA_PORT = 0X00;
   LCD_DATA_DDR  = 0XFF;
}

void lcd_en_signal(void)
{   
   LCD_CTRL_PORT&=~LCD_EN;
   _delay_us(1);
   LCD_CTRL_PORT|=LCD_EN;
   _delay_us(1);
   LCD_CTRL_PORT&=~LCD_EN;   
}

main()
{
   PORTD=0X00;
   DDRD=0XFF;
   unsigned count=0;
   lcd_init();      
   
   while(1)
   {
       lcd_write_comm(0x01); //清屏 
       lcd_write_str(0,0,"dfgfhfgj");
       lcd_write_str(0,1,"shfghjhgkgk");
	   PORTD=1<<(count++%8);
       for(unsigned char i=0;i<200;i++)
	   _delay_ms(88);
	   
	   lcd_write_comm(0x01); //清屏 
	   lcd_write_str(0,0,"remember mydream");
       lcd_write_str(0,1,"I will be winner");
       PORTD=1<<(count++%8);
	   for(unsigned char j=0;j<200;j++)
	   _delay_ms(88); 
         
   }
}