(original) make an electronic clock with LCD1602 display to display the current time on the LCD. The display format is "hour: minute: Second: second". There are four function keys K1 ~ K4, and the fun

（ original ） Make one using LCD1602 Display electronic clock , stay LCD The current time is displayed on . Display format is “ always : Points... Points : Seconds seconds ”. Equipped with 4 Function keys k1～k4, Function as follows ：

（1）k1—— Enter time modification .

（2）k2—— Modification hours , Click k2, Current hours increase 1.

（3）k3—— Revise the score , Click k3, The current score increases 1.

（4）k4—— Confirm that the modification is complete , The electronic clock runs and displays according to the modified time .

Source code and simulation link

link : Click to download
The following is the program code

// Header file section   See the main program for the name   Need to create  .h  file 
// If you can't use it, please download the source code directly   Links are at the beginning and end of the article 
#include<intrins.h>
sbit RS=P2^6;
sbit RW=P2^5;
sbit E=P2^7;
unsigned char j=20;
unsigned char hour = 23;
unsigned char minute = 59;
unsigned char second = 58;
sbit P30=P3^0;
sbit P31=P3^1;
sbit P32=P3^2;
sbit P33=P3^3;
void delay(unsigned char time){
    
	unsigned char i,j,k;
	for(k=0;k<time;k++){
    
		for(i=0;i<20;i++)
			for(j=0;j<15;j++);
	}
}
void delay1(unsigned char time){
    
	unsigned char i,j,k;
	for(k=0;k<time;k++){
    
		for(i=0;i<255;i++)
			for(j=0;j<255;j++);
	}
}
void delay2(){
    
	unsigned char i,j;
	for(i=0;i<255;i++)
		for(j=0;j<255;j++);
}
void write_command(unsigned char com){
    
	E=0;
	RS=0;
	RW=0;
	P0=com;
	E=1;
	_nop_();
	E=0;
	delay(1);
}
void lcd_initial(void){
    
	write_command(0x38);
	write_command(0x0c);
	write_command(0x06);
	write_command(0x01);
	delay(1);	
}
void write_data(unsigned char dat){
    
	E=0;
	RS=1;
	RW=0;
	P0=dat;
	E=1;
	_nop_();
	E=0;
	delay(1);
}
void string(unsigned char ad,unsigned char *s){
    
	write_command(ad);
	while(*s>0){
    
		write_data(*s++);
		delay(4);
	}
}
void string1(unsigned char ad,unsigned char s){
    
	unsigned char ge = s%10;
	unsigned char shi = s/10;
	write_command(ad);
	write_data(shi+48);
	delay(4);
	write_data(ge+48);
	delay(4);
}
void showSchHo(void){
    
	string(0x80,"schooling hours");
	string(0xc0,"Time");
	string1(0xc5,hour);
	string(0xc7,":");
	string1(0xc8,minute);
	string(0xca,":");
	string1(0xcb,second);
}
void showOK(void){
    
	string(0x80,"...IT IS OK!...");
	string(0xc0,"Time");
	string1(0xc5,hour);
	string(0xc7,":");
	string1(0xc8,minute);
	string(0xca,":");
	string1(0xcb,second);
}
void showCa(void){
    
	string(0x80,".....Casio.....");
	string(0xc0,"Time");
	string1(0xc5,hour);
	string(0xc7,":");
	string1(0xc8,minute);
	string(0xca,":");
	string1(0xcb,second);
}

#include<reg51.h>
#include<LCD1602Time.h>
void main(){
    
	IT0=1;
	EA=1;
	EX0=1;
	TR0=1;
	ET0=1;
	TMOD=0x01;
	TH0=0x4c;
	TL0=0x00;
	lcd_initial();
	while(1){
    
		showCa();
	}
}
void int0(void) interrupt 0 {
    
	unsigned char key = 1;
	showSchHo();
	while(key){
    
		if(P30 == 0){
    
			delay2();
			if(P30 == 0){
    
				hour++;
				showSchHo();
				if(hour == 24){
    
					hour = 0;
					showSchHo();
				}
			}
		}
		if(P31 == 0){
    
			delay2();
			if(P31 == 0){
    
				minute++;
				showSchHo();
				if(minute == 60){
    
					minute = 0;
					showSchHo();
				}
			}
		}
		if(P33 == 0){
    
			delay2();
			if(P33 == 0){
    
				key = 0;
				showOK();
				delay1(3);
			}
		}
	}
}

void time(void) interrupt 1	{
    
	TH0=0x4c;
	TL0=0x00;
	j--;
	if(j==0){
    
		second++;
		if(second == 60){
    
			second = 0;
			minute++;
			if(minute == 60){
    
				minute = 0;
				hour++;
				if(hour == 24){
    
					hour = 0;
				}
			}
		}
		j = 20;
	}
}

Simulation picture :

summary

When the main program is always displayed , branch , Seconds three variables to 1602 On , Whether the values of the three variables change , Every time the number display task is completed, it will be refreshed immediately . such , As long as the time, minute and second variables change , The program will respond immediately . The value of the three variables of time, minute and second is determined by timing and int0 Interrupt to complete together . In the normal counting state , The value of the three variables is increased by a timed interrupt / Zeroing . When the button is pressed 1（ That is to say int0 interrupt ） after , The value of three variables depends on P30、P31、P33 Connected buttons to change .

Source code and simulation link

link : Click to download