lcd显示.txt

用ATmega8单片机驱动1602液晶显示

/*************************************************************
 LCD1602 Drive Program
 For 51 MCU
    by Donald
    2006-7-19
**************************************************************/
#include <reg52.h>

#define  LINE1     0
#define  LINE2     1
#define  LINE1_HEAD    0x01//0x80
#define  LINE2_HEAD    0x03//0xC0
#define  LCD_DELAY_TIME   40
#define  DATA_MODE    0x13//0x38
#define  OPEN_SCREEN    0x30//0x0C
#define  DISPLAY_ADDRESS   0x01//0x80
#define  CLR      0x80//0x01
#define  BUSY      0x01//0x80   //LCD Busy Tag

#define  LCDIO     P0
sbit   LCD1602_RS=P1^7; //Data Command Pin  1 data  0 command pin 4 
sbit   LCD1602_RW=P1^6; //Read Write Pin  1 read   0 write    pin 5
sbit   LCD1602_EN=P2^7; //LCD Enable Signal  pin 6

/****************************************************************/
void delay_5ms(void);           //LCD Delay Function 
void LCD_command(unsigned char command,unsigned char BusyC); //write command function
void LCD_data(unsigned char temp,unsigned char BusyC);   //write data function
void LCD_set_xy( unsigned char x, unsigned char y );   //set display address function
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat);//write lcd a character function
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);//write lcd string function
void LCD_init(void);           //lcd initize function
unsigned char ReadStatus(void);

void delay_400ms(void);           //delay function

/********************************************************************/
void main(void)
{
 LCD_init(); 
 while(1)    
 {
  LCD_command(CLR,0);
  LCD_write_string(0,LINE1,"Wellcome to DUT");
     LCD_write_string(0,LINE2,"www.dlut.edu.cn");
        
     delay_400ms();delay_400ms();
     LCD_command(CLR,0);
        
     LCD_write_string(0,LINE1,"   LCD Test     ");
     LCD_write_string(0,LINE2,"   Successful!  ");
         
     delay_400ms();delay_400ms();

  LCD_command(CLR,0);

  LCD_write_string(0,LINE1,"  I'm Donald.   ");
     LCD_write_string(0,LINE2,"   Thank You!   ");

     delay_400ms(); delay_400ms();            
 }
}
//
//
//
void delay_5ms(void)   
{
 unsigned int i=5552;
 while(i--);
}
//
//
//
void LCD_command(unsigned char command,unsigned char BusyC)
{
 if (BusyC) ReadStatus(); //Test it busy or not
 LCDIO=command;
 LCD1602_RS=0;   
 LCD1602_RW=0;
 LCD1602_EN=0;
 LCD1602_EN=0;
 LCD1602_EN=1;
}
//
//
//
void LCD_data(unsigned char dat,unsigned char BusyC)
{
 if (BusyC) ReadStatus(); //Test it busy or not
 LCDIO=dat;
 LCD1602_RS=1;
 LCD1602_RW=0;
 LCD1602_EN=0;
 LCD1602_EN=0;
 LCD1602_EN=1;
}
//
//
//
void LCD_set_xy( unsigned char x, unsigned char y )
{
 unsigned char address;
 if (y == LINE1) 
  address = LINE1_HEAD + x;
 else 
     address = LINE2_HEAD + x;
 LCD_command(address,1); 
}
//
//
//
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat)
{
 LCD_set_xy( x, y ); 
 LCD_data(dat,1);
}
//
//
//
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
{
    LCD_set_xy( X, Y ); //set address 
    while (*s)  // write character
    {
     LCDIO=*s;
     LCD_data(*s);   
     s++;
    }
}
//
//
//
void LCD_init(void)
{
 delay_400ms(); 
 LCD_command(CLR,0);//clear screen 
 LCD_command(DATA_MODE,1);//set 8 bit data transmission mode 
 LCD_command(OPEN_SCREEN,1);//open display (enable lcd display)
 LCD_command(DISPLAY_ADDRESS,1);//set lcd first display address 
 LCD_command(CLR,1);//clear screen
}
//
//LCD Delay Function
//
void delay_400ms(void)      
{
 unsigned char i = 5;
 unsigned int j;
 while(i--){
  j=7269;
  while(j--);
 };  
}

//
//Read the LCD State
//
unsigned char ReadStatus(void)
{
 LCDIO = 0xFF; 
 LCD1602_RS = 0;
 LCD1602_RW = 1;
 LCD1602_EN = 0;
 LCD1602_EN = 0;
 LCD1602_EN = 1;
 while (LCDIO & BUSY); //Test Busy State
 return(LCDIO);
}