lcd1602.txt

LCD16*2系列LCD是一款字符液晶显示模块。常见于单片机实验的显示设备中,绝对实用

#include <avr/io.h> 

#define LCD_EN_PORT    PORTC 
#define LCD_RW_PORT    PORTC 
#define LCD_RS_PORT    PORTC 
#define LCD_DATA_PORT  PORTA 
#define LCD_DATA_DDR   DDRA 
#define LCD_DATA_PIN   PINA 

//LCD的 r/w 脚直接接 GND 
#define LCD_EN         0x80   //portd7        out 
#define LCD_RS         0x40   //portc6        out 
#define LCD_DATA       0xF0   //porta 4/5/6/7   out 

/*-------------------------------------------------------------------------------------------------- 
Public function prototypes 
--------------------------------------------------------------------------------------------------*/ 
void LCD_init         (void); 
void LCD_en_write     (void); 
void LCD_write_char   (unsigned command,unsigned 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 delay_nus        (unsigned int n); 
void delay_nms        (unsigned int n); 


void LCD_init(void)       //液晶初始化 
{ 
 delay_nms(15); 
  
 DDRA |= LCD_DATA;   // 数据为输出 
 DDRC |= LCD_RS | LCD_EN;  //置位RS.EN 
  
 LCD_write_char(0x28,0);  //4位显示 
 LCD_write_char(0x0c,0);  //显示开 
 LCD_write_char(0x01,0);  //清屏 
  
 delay_nms(60); 
} 

void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) 
{ 
 LCD_set_xy( X, Y ); //写地址 
    
 while (*s) { 
    LCD_write_char( 0, *s ); 
   s ++; 
 } 
} 
   
void LCD_set_xy( unsigned char x, unsigned char y )  //写地址函数 
{ 
 unsigned char address; 
  
 if (y == 0) 
   address = 0x80 + x; 
 else  
   address = 0xc0 + x; 
       
 LCD_write_char(address, 0 ); 
} 

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_char(unsigned command,unsigned data) // 写数据 
{ 
 unsigned command_temp,data_temp; 
  
 command_temp = command; 
 data_temp = data; 
 delay_nus(16); 
  
 if(command == 0) { 
   LCD_RS_PORT |= LCD_RS;  //RS=1 
   LCD_DATA_PORT &= 0X0f; 
   LCD_DATA_PORT |= data_temp & 0xf0;  //写高四位 
    
   LCD_en_write(); 
    
   data_temp = data_temp << 4;   
   LCD_DATA_PORT &= 0X0f; 
   LCD_DATA_PORT |= data_temp & 0xF0;   //写低四位 
    
   LCD_en_write(); 
 } 
 else { 
   LCD_RS_PORT &= ~LCD_RS;   //RS=0 
   LCD_DATA_PORT &= 0X0f; 
   LCD_DATA_PORT |= command_temp & 0xF0; //写高四位 
    
   LCD_en_write(); 
    
   command_temp = command_temp << 4; 
   LCD_DATA_PORT &= 0x0F; 
   LCD_DATA_PORT |= command_temp & 0xF0;  //写低四位 
    
   LCD_en_write(); 
  } 
} 



int main(void) 
{ 

 LCD_init(); 
  
 LCD_write_string(0,0,"Hello,AVR WORLD!!!"); 
 LCD_write_string(0,1,"[e-mail]"); 

 while(1); 
  
} 
   /*----------------------------------------------------------------------- 
延时函数 
系统时钟：8M 
-----------------------------------------------------------------------*/ 
void delay_1us(void)                 //1us延时函数 
  { 
   asm("nop"); 
  } 

void delay_nus(unsigned int n)       //N us延时函数 
  { 
   unsigned int i=0; 
   for (i=0;i<n;i++) 
   delay_1us(); 
  } 
   
void delay_1ms(void)                 //1ms延时函数 
  { 
   unsigned int i; 
   for (i=0;i<1356;i++); 
  } 
   
void delay_nms(unsigned int n)       //N ms延时函数 
  { 
   unsigned int i=0; 
   for (i=0;i<n;i++) 
   delay_1ms(); 
  } 
 
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