1602.c

lcd1602的四位数据线用法

#include<REG51.h>
#include<ABSACC.H>
#include <intrins.h>
#include"1602.h"

void inst_lcd(void)
{
LCD_E=0;
LCD_RS=0;

//LCD_RW=0 ; //已经接地，恒为0//
/////////////////////////
//三次显示模式设置
com_h(0x30,10);
com_h(0x30,10);
com_h(0x30,10);
com_h(0x20,10);	//4总线模式

delay_lcd(100);//延时5ms//

com_f(0x28);	  	//4总线模式，双行显示


delay_lcd(100);//延时5ms//
com_f(0x01);		 //清屏
delay_lcd(50);//延时5ms//

com_f(0x02);		 //光标复位
delay_lcd(50);//延时5ms//

com_f(0x0C);		   //开显示
delay_lcd(50);//延时5ms//
	

com_f(0x06);			 //文字不动,光标右移
delay_lcd(50);//延时5ms//

com_f(0x40);			 //文字不动,光标右移
delay_lcd(50);//延时5ms// 


}

void disp(unsigned char x,unsigned char y,unsigned char dec)
{
 unsigned char ge,shi;
 shi=dec/10;
 ge=dec%10;
 shi|=0x30;
 ge|=0x30;
 dispchar(x,y,shi);
 dispchar(x+1,y,ge);
}


void disp_bcd(unsigned char x,unsigned char y,unsigned char bcd)
{
 unsigned char ge,shi;
 ge=(bcd&0x0f);
 shi=(bcd>>4);
 shi|=0x30;
 ge|=0x30;
 dispchar(x,y,shi);
 dispchar(x+1,y,ge);
}



void dispchar(unsigned char x,unsigned char y,unsigned char ddat)
{
 y&=0x01;
 x&=0x0f;
 if(y) x|=0x40;
 x|=0x80;
 com_f(x);
 dat(ddat);
}

void com_f(unsigned char ch_temp)
{

unsigned char tt,te;
LCD_RS=0;
delay_lcd(5);
te=P1&0x0f;
tt=ch_temp&0xf0;
//tt=tt>>2;
P1=te|tt;
_nop_();
_nop_();
LCD_E=1;
_nop_();
_nop_();
LCD_E=0;
//写入高4位//

te=P1&0x0f;
tt=ch_temp&0x0f;
tt=tt<<4;
P1=te|tt;
_nop_();
_nop_();
LCD_E=1;
_nop_();
_nop_();
LCD_E=0;
//低4位//
delay_lcd(5);
}


void dat(unsigned char dat_temp)
{

unsigned char tt,te;
LCD_RS=1;
delay_lcd(5);
te=P1&0x0f;
tt=dat_temp&0xf0;
//tt=(tt>>2);
P1=te|tt;
_nop_();
_nop_();
LCD_E=1;
_nop_();
_nop_();
LCD_E=0;
//写入高4位//
delay_lcd(5);
te=P1&0x0f;
tt=dat_temp&0x0f;
tt=tt<<4;
P1=te|tt;
_nop_();
_nop_();
LCD_E=1;
_nop_();
_nop_();
LCD_E=0;
//低4位//
}

void com_h(unsigned char temp,unsigned char time)
{
unsigned char te;
LCD_RS=0;
te=P1&0x0f;
temp&=0xf0;
//temp=temp>>2;
P1=te|temp;
delay_lcd(time);
LCD_E=1;
_nop_();
_nop_();
LCD_E=0;
}

void delay_lcd(unsigned char time)
{
  unsigned char i,j;
 for (i=0;i<time;i++)
 { 
   j=100;
   while(j--);
 }
 
}