1602b_lcd.i

基于MEGA16单片机的1602液晶显示屏的程序

//编译器：ICC-AVR v6.31A 日期: 2005-11-24 20:29:57 
//目标芯片 : M16 
//时钟: 8.0000Mhz 
/*------------------------------------------------------------- 
LCD引脚定义 
1---GND  
2---VCC 
3---VO 
4---RS 
5---RW 
6---EN 
7到14--D0-D7 
15--背景灯+ 
16--背景灯- 
-----------------------------------------------------------------*/ 
//#include <mega16.h> 

/*--------------------------------------------------------------- 
下面是AVR与LCD连接信息 
PA2 ->RS 
PA3 ->EN 
地  ->RW 
PA4 ->D4 
PA5 ->D5 
PA6 ->D6 
PA7 ->D7 
要使用本驱动，改变下面配置信息即可 
-----------------------------------------------------------------*/ 
///////////////////////////////////////////////////////////////////

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 delay_nus(unsigned int n); 
void delay_nms(unsigned int n); 
//============================================================================== 


void LCD_init(void)         //液晶初始化 
{ 
  DDRA    |=((1<<4)|(1<<5)|(1<<6)|(1<<7)) ;   //数据口方向为输出 
  DDRA |=(1<<3) ;       //设置EN方向为输出 
  DDRA |=(1<<2) ;       //设置RS方向为输出 
  LCD_write_command(0x28);  
  LCD_en_write(); 
  delay_nus(40); 
  LCD_write_command(0x28);  //4位显示 
  LCD_write_command(0x0c);  //显示开 
  LCD_write_command(0x01);  //清屏 
  delay_nms(2); 
}