DIGITAL CLOCK IN C ( NOT USING 'IF' Statements)

[brucelee2]

HI all,


Im trying to make a digital clock in using an 80515. I want to do it without using 'IF' conditions to check counters ect. I will then Display it on a 4X7segemnt display HDSP-B08G.

Apart from the Clock i also want to implement a BCD to 7-segment decoder without 'IF' statements.

I will need to use bitwise operators i assume but the technique im not sure of, any examples notes?.

OUTLINE:

TIMER -increment counter(needs to be reset with bitwise operators??)
Interrupt1 - To diaplay on the seven segments alternatly and fast enough for the human eye.


I WANT TO USE DIGITAL TECHNIQUES BUT WITH C :idea:


THANKS

 

[kender]

Out of curiosity, why do you want to avoid ifs? Is this constraint declared for exercise purposes?

 

[brucelee2]

I gather the use of bitwise operators for a task uses less 'processing power' from the Microcontroller. To become familier more familier with bitwise operators too.

Any ideas?

 

[brucelee2]

NEED TO BE REPLACED or different system with no IF statements. Does any body have an idea?

void Init_Timer(void)//timer zero
{

 TMOD=0x01;
 TR0=1;
 ET0=1;
 TH0=0xFC;  //64535 - 65535   
 TL0=0x17;  //

}

void Init_int(void)
{
//turn off interupts the configure priority then turn on. 
IEN0=0x00; //turn off interrupts.
           //3 interrupts-Timer1,-Button,-Display freq(most->least).
                                                                    

//NOT FINISHED YET




}

void ISR_timer(void) interrupt 1
{
 TH0=0xFC;    //xtal@12MHZ  ISR 12 machine cycles, timer reg incremented    every 1/1e6-->counter every ms

  TL0=0x17;
 counter++; 
}
                                          


void main(void)
{
  Init_int();
  Init_Timer();
  port_init();
 
 while (1) {      

             if(counter>=1000)  NEED TO BE REPLACED or different system with no IF statements
              {
	 	    //printf("Time=%2:%2d:%2d\n", h1,m1,s1);
               s1++; 
               counter=0; 
              }

             if(s1>59)
             {
               s1=0;
               m1++;
             }

             if(m1>59)
              {
               m1=0;
               h1++;

               if (h1 >23)
	        {
	         h1=0;
	        }

               }
      

            }


   
}

THANKS!

 

[kender]

Your code looks fine. I would probably write it in a similar fashion.

I gather the use of bitwise operators for a task uses less 'processing power' from the Microcontroller.

For a clock, which increments every second or every millisecond even. not much processing power is needed.

 

[garg29]

use ds1302