原创 1602的AVR的C驱动(4线方式)

参考了OURAVR的程序，自己写了一个，加上光标和屏幕滚动代码
#define LCD_EN_PORT    PORTA   //以下2个要设为同一个口
#define LCD_EN_DDR     DDRA
#define LCD_RS_PORT    PORTA   //以下2个要设为同一个口
#define LCD_RS_DDR     DDRA
#define LCD_DATA_PORT  PORTA   //以下3个要设为同一个口
#define LCD_DATA_DDR   DDRA    //一定要用高4位
#define LCD_DATA_PIN   PINA
#define LCD_RS         (1<<PA1) //0x02  portA1       out
#define LCD_EN         (1<<PA3) //0x08   portA3       out
#define LCD_DATA       ((1<<PA4)|(1<<PA5)|(1<<PA6)|(1<<PA7)) //0xf0   portA4/5/6/7 out
uchar  LCD="1"  ; //是否让LCD显示   0，不显示;;;1显示
/*--------------------------------------------------------------------------------------------------
函数说明
--------------------------------------------------------------------------------------------------*/
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);

void LCD_Init(void)         //液晶初始化
{
 LCD_DATA_DDR|=LCD_DATA;   //数据口方向为输出
  LCD_EN_DDR|=LCD_EN;       //设置EN方向为输出
  LCD_RS_DDR|=LCD_RS;       //设置RS方向为输出

  CLI();
 PORTA&=~0x04;//RW=0
 DDRA=0xff;
 LCD_write_command(0x30);
 Delay_nms(10);
 LCD_write_command(0x30);
 Delay_nms(5);
 LCD_write_command(0x30);
 Delay_nms(5);
  LCD_write_command(0x28);//写指令，４位数据线，５＊１０字体
  LCD_en_write();
  Delay_nms(4);
  LCD_write_command(0x28);  //4位显示
  LCD_en_write();
  LCD_write_command(0x0c);  //显示开　光标关，字符不闪烁
  LCD_en_write();
  SEI();
  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;  //  给出下降沿
}

void LCD_write_command(unsigned char command) //写指令   E下降，RS=0,RW=0
{
 Delay_nms(6);
  LCD_RS_PORT&=~LCD_RS;        //RS=0
  LCD_DATA_PORT&=0X0f;         //清高四位
  LCD_DATA_PORT|=command&0xf0; //写高四位
  LCD_en_write();               //E下降
  command="command"<<4;          //低四位移到高四位
  LCD_DATA_PORT&=0x0f;         //清高四位
  LCD_DATA_PORT|=command&0xf0; //写这次低四位到数据线高４位
  LCD_en_write();
 
}

void LCD_write_data(unsigned char data) //写数据     E下降，RS=1,RW=0
{
  Delay_nms(6);
  LCD_RS_PORT|=LCD_RS;       //RS=1
  LCD_DATA_PORT&=0X0f;       //清高四位
  LCD_DATA_PORT|=data&0xf0;  //写高四位
  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;   //写低四位
  LCD_en_write();
}

void LCD_set_xy( unsigned char x, unsigned char y )  //写地址函数
{
    unsigned char address;
    if (y == 0) address = 0x80 + x;  // 最高位是１，另七位才是地址　故有+0x80
    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 ); //写地址   
    while (*s)  // 写显示字符
    {
      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 ); //写地址
  LCD_write_data( data);
 
}
/*光标移动*/
void CursorScroll(void)
{
 
 
 LCD_write_command(0x10); //光标左移
  
}
/*画面滚动*/
void ScreenScroll(void)
{
 //while(1)
 {
 LCD_write_command(0x18);  //画面左滚
 Delay_nms(300);
 } 
}