Thank u .Pls find the code bellow.
// Program to make a clock with time setting functionality.
#include<reg51.h>
sbit dig_ctrl_4=P1^0; //Declare the control pins of the seven segment
sbit dig_ctrl_3=P1^1;
sbit dig_ctrl_2=P1^2;
sbit dig_ctrl_1=P1^3;
sbit reset=P1^4; // Reset pin to reset the clock.
sbit start=P1^7; //Start pin to start the clock after the time is set.
sbit incr=P1^6; //Increment pin to increase the digits during time setting.
sbit set=P1^5; // Set pin to set the time.
int sel_seg_to_incr=0;
int ret_seg_to_incre=0;
int recnt_incr_seg;
unsigned char dig_disp=0;
int min2=0;
int min1=0;
int sec2=0;
int sec1=0;
char dig_val[10]={0x40,0xF9,0x24,0x30,0x19,0x12,0x02,0xF8,0x00,0x10}; // to store values corresponding to digits 0 to 9
void delay(int a) // Function to provide a time delay of approx. 1 second using Timer1.
{
int i;
for(i=0;i<a;i++)
{
TL1=0xFD;
TH1=0x4B;
TR1=1;
while(TF1==0);
TR1=0;
TF1=0;
}
}
int setfn() // Function to select minute and seconds digit to be set.
{
while(set==0)
{
switch(recnt_incr_seg)
{
case 1:
if(set==0) //select the min2 digit
{
dig_ctrl_4=1;
dig_ctrl_3=0;
dig_ctrl_2=0;
dig_ctrl_1=0;
recnt_incr_seg=1;
ret_seg_to_incre=1;
P2=dig_val[min2];
delay(20);
}
case 2:
if(set==0) // Select the min1 digit
{
dig_ctrl_4=0;
dig_ctrl_3=1;
dig_ctrl_2=0;
dig_ctrl_1=0;
recnt_incr_seg=2;
ret_seg_to_incre=2;
P2=dig_val[min1];
delay(20);
}
case 3:
if(set==0) //Select the sec 2 digit
{
dig_ctrl_4=0;
dig_ctrl_3=0;
dig_ctrl_2=1;
dig_ctrl_1=0;
recnt_incr_seg=3;
ret_seg_to_incre=3;
P2=dig_val[sec2];
delay(20);
}
case 4:
if(set==0) //Select the sec1 digit
{
recnt_incr_seg=1;
dig_ctrl_4=0;
dig_ctrl_3=0;
dig_ctrl_2=0;
dig_ctrl_1=1;
ret_seg_to_incre=4;
P2=dig_val[sec1];
delay(20);
recnt_incr_seg=1;
}
}
}
return(ret_seg_to_incre);
}
void increase(int a) //Function to set the minute or seconds digit
{
while(incr==0)
{
switch(a)
{
case 1: // To set the min2 digit.
P2=dig_val[min2]; //Display the value of min2
delay(15);
min2++;
if(min2==6)
min2=0;
P2=dig_val[min2];
delay(5);
break;
case 2: //To set the min1 digit.
P2=dig_val[min1];
delay(15);
min1++;
if(min1==10)
min1=0;
P2=dig_val[min1];
delay(5);
break;
case 3: // To set the sec2 digit.
P2=dig_val[sec2];
delay(15);
sec2++;
if(sec2==6)
sec2=0;
P2=dig_val[sec2];
delay(5);
break;
case 4: //To set the sec1 digit.
P2=dig_val[sec1];
delay(15);
sec1++;
if(sec1==10)
sec1=0;
P2=dig_val[sec1];
delay(5);
break;
}
}
}
void resetfn() // This function brings the clock to reset or set mode.
{
IE=0x80; //Disable timer0 interrupt to stop the display of the clock
sel_seg_to_incr=1;
recnt_incr_seg=1;
dig_ctrl_4=1;
dig_ctrl_3=0;
dig_ctrl_2=0;
dig_ctrl_1=0;
P2=dig_val[min2];
delay(5);
while(1)
{
if(start==0) //check if start pin is pressed
{
TMOD=0x11; //reset the timer0
TL0=0xf6;
TH0=0xFf;
IE=0x82; //enabling again the timer0 interrupt to start displaying of the clock
TR0=1;
break; // break loop and return to main program
}
if(set==0) //if set pin is pressed call set function
sel_seg_to_incr=setfn();
if(incr==0) // if incr pin is pressed call incr function
increase(sel_seg_to_incr);
}
}
void display() interrupt 1 // function to display the values on seven segmnet. For more details refer seven segment multiplexing.
{
TL0=0x36; //reloading timer0
TH0=0xf6;
P2=0xFF;
dig_ctrl_1 = dig_ctrl_3 = dig_ctrl_2 = dig_ctrl_4 = 0;
dig_disp++;
dig_disp=dig_disp%4;
switch(dig_disp)
{
case 0:
P2=dig_val[sec1];
dig_ctrl_1 = 1;
break;
case 1:
P2= dig_val[sec2];
dig_ctrl_2 = 1;
break;
case 2:
P2= dig_val[min1];
dig_ctrl_3 = 1;
break;
case 3:
P2= dig_val[min2];
dig_ctrl_4 = 1;
break;
}
}
void main() //main function the programs begins from here
{
set=1; //delaring set, reset, start and incr as input pins
reset=1;
start=1;
incr=1;
TMOD=0x11; //enabling timer0
TL0=0xf6; //loading timer0
TH0=0xFf;
IE=0x82; //initialize timer0 interrupt
TR0=1; //triggering timer0
while(1) //forward counting of clock
{
while(min2<6)
{
while(min1<10)
{
while(sec2<6)
{
while(sec1<10)
{
if(reset==0)
resetfn();
delay(20);
sec1++;
}
sec1=0;
sec2++;
}
sec1=0;
sec2=0;
min1++;
}
sec1=0;
sec2=0;
min1=0;
min2++;
}
min2=0;
}
}