lcd1602.h

关于LCD1602字符液晶显示器的驱动程序

#ifndef _LCD1602_H_
#define _LCD1602_H_
/********************************************************************/
#include "reg51.h"
#include "stdio.h"
//lcd part
#define  LINE1     0
#define  LINE2     1
#define  LINE1_HEAD    0x80
#define  LINE2_HEAD    0xC0
#define  LCD_DELAY_TIME   40
#define  SET_DATA_MODE    LCD_en_command(0x38)
#define  LCD_SHOW    LCD_en_command(0x0C)				//显示
#define  LCD_HIDE    LCD_en_command(0x00)				//隐藏
//模式设定	 移位  输入方式	  一般不用
#define  CURSOR_L_SHIFT		LCD_en_command(0x04)		 // 输入1bit数据，光标左移
#define  CURSOR_R_SHIFT		LCD_en_command(0x06)		  //	 光标右移
#define  CHAR_L_SHIFT		LCD_en_command(0x05)	 //光标不动，字符左移
#define  CHAR_R_SHIFT		LCD_en_command(0x07)	 //光标不动，字符右移
////////////////////////
#define  SET_DISPLAY_ADDRESS    LCD_en_command(0x80)
#define  CLEAR_SCREEN           LCD_en_command(0x01)				//清屏
#define	 CURSOR_ON              LCD_en_command(0x0e)				//光标开
#define	 CURSOR_OFF             LCD_en_command(0x0c)			//光标关
#define	 CURSOR_FLASH           LCD_en_command(0x0f)	//光标闪烁
#define	 CURSOR_NO_FLASH        LCD_en_command(0x0e)//光标不闪烁
#define	 CURSOR_TO_HOME         LCD_en_command(0x02)  //光标复位
//使动操作   移位
#define  CURSOR_L_MOVE		LCD_en_command(0x10)      // 光标左移
#define  CURSOR_R_MOVE		LCD_en_command(0x14)	 //	 光标右移
#define  CHAR_L_MOVE		LCD_en_command(0x18)	 //光标不动，字符左移
#define  CHAR_R_MOVE		LCD_en_command(0x1C)	 //光标不动，字符右移 
///////////////////////////////											   
//common part 
#define  HIGH   1
#define  LOW    0
#define  TRUE   1
#define  ZERO   0 

/*******************************************************************/
//不同的电路修改为相应引脚即可
#define  LCDIO     P3
sbit LCD1602_RS=P2^2;   //data command select  1 data  0 command  pin 4 
sbit LCD1602_RW=P2^1;   //read write select   1 read   0 write     pin 5
sbit LCD1602_EN=P2^0;   //LCD enable signal             pin 6

/********************************************************************/
void LCD_delay(void);//lcd delay 
void LCD_en_command(unsigned char command);//write command 
void LCD_en_dat(unsigned char temp);//write data 
void LCD_set_xy( unsigned char x, unsigned char y );//set display address 
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat);//write lcd a character 
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);//write lcd string 
void LCD_init(void);//lcd initize 
void LCD_write_number(unsigned char X,unsigned char Y,double number);//write a number
/********************************************************************/
void delay_nms(unsigned int n);//delay 

/********************************************************************/
char buffer[8]={0};
/******************** LCD PART *************************************/
void LCD_delay(void)   
{
 unsigned char i;
 for(i=LCD_DELAY_TIME;i>ZERO;i--)  //be sure lcd reset
   ;
}
/********************************************************************写指令*/  
void LCD_en_command(unsigned char command)
{
 LCDIO=command;
 LCD1602_RS=LOW;   
 LCD1602_RW=LOW;
 LCD1602_EN=LOW;
 LCD_delay();
 LCD1602_EN=HIGH;
}
/********************************************************************写数据*/
void LCD_en_dat(unsigned char dat)
{
 LCDIO=dat;
 LCD1602_RS=HIGH;
 LCD1602_RW=LOW;
 LCD1602_EN=LOW;
 LCD_delay();
 LCD1602_EN=HIGH;
}
/********************************************************************设置显示位置x列y行*/
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_en_command(address); 
}
/*******************************************************************写字符*/
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat)
{
 LCD_set_xy( x, y ); 
 LCD_en_dat(dat);
}
/*******************************************************************写字符串*/
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_en_dat(*s);   
     s ++;
    }
}
/*******************************************************************初始化LCD显示器，设置工作方式*/
void LCD_init(void)
{ 
 CLEAR_SCREEN;//clear screen 
 SET_DATA_MODE;//set 8 bit data transmission mode 
 CURSOR_FLASH;
 //CURSOR_L_SHIFT;
 SET_DISPLAY_ADDRESS;//set lcd first display address 
 CLEAR_SCREEN;//clear screen
}
/********************************************************************/
/*********************** OTHER PART ********************************延时*/
void delay_nms(unsigned int n)      
{
    unsigned int i=0,j=0;
    for (i=n;i>0;i--)
     for (j=0;j<1140;j++);  
}

///////////////////////////////////////////////////////////////////////////////写数字(慎用，占用较多内存)
/*void LCD_write_number(unsigned char X,unsigned char Y,double number)
{
 sprintf(buffer,"%6.3f",number);
 LCD_write_string(X,Y,buffer);
}	  */
#endif