Design of LCD Electronic Clock Based on C51 Single Chip Computer

A school curriculum

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1 LCD electronic clock design
1. Make an electronic clock based on LCD display and display the current time on the LCD display.
2. Use character LCD display to display time.
3. Display format: "Hours: Minutes: Seconds Seconds".
4. Use 4 function keys to set the current time. The functions of function keys K1~K4 are as follows:
(1) K1: enter the current time setting;
(2) K2: modify the hour and display the modification result;
(3) K3: modify the minute and display the modification result;
(4) K4: confirm Complete the settings.

Code

#include<reg52.h>
#include<stdlib.h>
#include<stdio.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
 
uint num,A_num,x,y=0;
uint h,m,s,year=2020,month=7,day=4,lcd_x=0,lcd_y=0;
 
uchar code Zifu[]="0123456789";
 
 
sbit LCD_EN = P3^4;
sbit LCD_RS = P3^5;
 
 
sbit key_A = P1^0;
sbit key_B = P1^1;
sbit key_C = P1^2;
sbit key_D = P1^3;

void delay_1ms(uchar x){
    
    
	uchar i,j;
	for(j=0;j<x;j++)
		for(i=0;i<110;i++);
}
 
void write_command(uchar command){
    
    
	LCD_RS = 0;
	LCD_EN = 0;
	P0 = command;
	delay_1ms(2);
	LCD_EN = 1;	 		//EN ?1 -- 0 ?? ???? ? ??
	delay_1ms(2);
	LCD_EN = 0;
}
 
void write_data(uchar fuck){
    
    
	LCD_RS = 1;
	LCD_EN = 0;
	P0 = fuck;
	delay_1ms(2);
	LCD_EN = 1;
	delay_1ms(2);
	LCD_EN = 0;
}
 
void lcd_post(int X,int Y){
    
    			//0,1?? ??? ? ???
	write_command(0x80+X*(0x40)+Y);
}
 
void init(){
    
    
	h=m=s=0;
	num=A_num=0;
 
	LCD_EN=0;
	write_command(0x38);
	write_command(0x0c);
	//write_command(0x06); //??????????
	write_command(0x01);
 
	TMOD = 0x02;
	TH0 = 6;
	TL0 = 6;
	EA = 1;
	ET0 = 1;
	TR0 = 1;
 
/*???*/	
	lcd_post(0,0); write_data(Zifu[h/10]);
	lcd_post(0,1); write_data(Zifu[h%10]);
 
	lcd_post(0,2); write_data(':');
 
	lcd_post(0,3); write_data(Zifu[m/10]);
	lcd_post(0,4); write_data(Zifu[m%10]);
 
	lcd_post(0,5); write_data(':');
 
	lcd_post(0,6); write_data(Zifu[s/10]);
	lcd_post(0,7); write_data(Zifu[s%10]);
 
/*???*/
	lcd_post(1,6); write_data(Zifu[year/1000]);
	lcd_post(1,7); write_data(Zifu[(year%1000)/100]);
	lcd_post(1,8); write_data(Zifu[(year%100)/10]);
	lcd_post(1,9); write_data(Zifu[year%10]);
 
	lcd_post(1,10); write_data('-');
 
	lcd_post(1,11); write_data(Zifu[month/10]);
	lcd_post(1,12); write_data(Zifu[month%10]);
 
	lcd_post(1,13); write_data('-');
 
	lcd_post(1,14); write_data(Zifu[day/10]);
	lcd_post(1,15); write_data(Zifu[day%10]);
}
 
 
void keyscan(){
    
    

			if(key_A==0){
    
    
			delay_1ms(3);
			if(key_A==0){
    
    	

					m=(++m)%60;
					lcd_post(0,3); write_data(Zifu[m/10]);
					lcd_post(0,4); write_data(Zifu[m%10]);

			while(!key_A);
		}
	}
	

	

		if(key_B==0){
    
    
			delay_1ms(3);
			if(key_B==0){
    
    	


					h=(++h)%24;
					lcd_post(0,0); write_data(Zifu[h/10]);
					lcd_post(0,1); write_data(Zifu[h%10]);

			while(!key_B);
		}
	}		
}
 
void main()
{
    
    
	init();
	y = 0;
	while(1){
    
    
		
		
if(key_D==0){
    
      
		delay_1ms(3);
		if(key_D==0){
    
    
			y = 1;
		}
		while(!key_D);
	}
if(key_C==0){
    
      
		delay_1ms(3);
		if(key_C==0){
    
    
			y = 0;
		}
		while(!key_C);
}
		


		
		if(num==3686){
    
    
			num=0;
			s++;
			if(s==60){
    
    
				s=0;
				m++;
				if(m==60){
    
    
					m=0;
					h++;
					if(h==24)h=0;
					lcd_post(0,0); write_data(Zifu[h/10]);
					lcd_post(0,1); write_data(Zifu[h%10]);
				}
				lcd_post(0,3); write_data(Zifu[m/10]);
				lcd_post(0,4); write_data(Zifu[m%10]);
			}
			lcd_post(0,6); write_data(Zifu[s/10]);
			lcd_post(0,7); write_data(Zifu[s%10]);
		}
		
		if(y == 1)
		{
    
    
		keyscan();
		}
		
		
		
	}
}
 
void T0_time() interrupt 1
{
    
    
	num++;
}

//	if(key_A==0){  //??????
//		delay_1ms(3);
//		if(key_A==0){
    
    

//		}
//		while(!key_A);
//	}