lcd1602.h

485多机通信+lcd液晶显示

#include <reg51.h>

//*******************LCD模块
//*******************LCD模块
#define LCD_DATA P1        //LCD的数据口

sbit LCD_BUSY=LCD_DATA^7;  //LCD忙信号位

sbit LCD_RW=P3^3;          //LCD读写控制
sbit LCD_RS=P3^2;          //LCD寄存器选择
sbit LCD_EN=P3^4;         //LCD使能信号

void LCD_check_busy(void)   //检测LCD状态，看它是不是还在忙呢
{
 while(1)
  {
   LCD_EN=0;
   LCD_RS=0; //指令寄存器通信
   LCD_RW=1;  //read data
   LCD_DATA=0xff;
   LCD_EN=1;
   if(!LCD_BUSY)break;
  }
 LCD_EN=0;
}

void LCD_cls(void)          //LCD清屏
{
 
 LCD_check_busy();
 LCD_RS=0;
 LCD_RW=0;
 LCD_DATA=1;
 LCD_EN=1;
 LCD_EN=0;
 
}

void LCD_write_instruction(unsigned char LCD_instruction)   //写指令到LCD
{
 LCD_check_busy();
 LCD_RS=0;
 LCD_RW=0;	//写数据
 
 LCD_DATA=LCD_instruction;
 LCD_EN=1;
 LCD_EN=0;
 }

void LCD_write_data(unsigned char LCD_data)      //输出一个字节数据到LCD
{
 LCD_check_busy();
 LCD_RS=1;
 LCD_RW=0;
 
 LCD_DATA=LCD_data;
 LCD_EN=1;
 LCD_EN=0;
 }
 
void LCD_set_position(unsigned char x)            //LCD光标定位第一行到x处
{
LCD_write_instruction(0x80+x);
}

void LCD_set_yposition(unsigned	char y)
{
LCD_write_instruction(0xc0+y);					//LCD光标定位到第二行y处
}

void LCD_printc(unsigned char lcd_data)          //输出一个字符到LCD
{
 	LCD_write_data(lcd_data);
}

void LCD_prints(unsigned char *lcd_string)       //输出一个字符串到LCD
{
 	unsigned char i=0;
 	
	while(lcd_string[i]!=0x00)
  	{
   		LCD_write_data(lcd_string[i]);
   		i++;
  	} 
}

//=========================================================================
// function : display one char in one position
// input	: chr --> display data
//			  posi --> display position
//			  row --> display row
// output	: void
// return	: void
// created date 2008-10-05
//=========================================================================
void	DispChrPosi(unsigned char chr, unsigned char posi,unsigned char row)
{
    unsigned char ch;

	if(row > 1)
	{
		LCD_prints("Error");
		return;
	}
	if(row == 1)
		ch = 0xc0+posi;
	else
	    ch = 0x80+posi;
	LCD_write_instruction(ch);
	LCD_write_data(chr);
}

//========================================================================
// function : display string
// input	: str --> display string
//			  posi--> first position
// output	: void
// return	: void
// created date  2008-10-05
//========================================================================
void	DispStrPosi(unsigned char *str, unsigned char posi, unsigned char row)
{
	unsigned char ch;
	unsigned char i = 0;

	if(row > 1)
	    return;	
	if(row == 1)
		ch = 0xc0+posi;
	else
	    ch = 0x80+posi;
	while(str[i] !=  0x00)
	{
		LCD_write_instruction(ch + i);
		LCD_write_data(str[i]);
		i ++;
	}
}

void LCD_initial(void)                        //初始化LCD
{
 LCD_write_instruction(0x3c);
 LCD_write_instruction(0x0c);
 LCD_write_instruction(0x06);//显示屏一定要不移动。
 LCD_cls();
}
//*************************LCD模块结束