[PIC] PIC 16F84A Dual display counter

[nav28ge]

Hi Every one,

can any one help me, my 7 segment dual display counter is counting from 0-99 how to make it start from 0 once it reaches 99 I am using PIC 16F84A

my code is

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void main()
{
 int loop = 0;                  /* Initialising loop variable to zero */
 
 PORTA = 0;                     /* Initialising PORTA and PORTB as OUTPUT PORTS*/
 trisa = 0b00000;
 PORTB = 0;
 trisb = 0b00000000;
 asm BCF PORTA,3
 PORTB= 0b11111111;             /* Blanking the LED2  */
 asm BSF PORTA,3
 asm BCF PORTA,3
 asm BCF PORTA,4
 PORTB= 0b11111111;              /* Blanking the LED1  */
 asm BSF PORTA,4
 asm BCF PORTA,4;
 
 while(1)
 {
  PORTB= 0b11111111;           /*Making portB bits as high */
  PORTA = 0b00000;             /*Making portA bits as LOW */
  asm BCF PORTA,3
  PORTB=0b00000011;            /*Sending  the data '0' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
    Delay_ms(500);
  asm BCF PORTA,3
   PORTB=0b10011111;             /*Sending the data '1' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
 
  PORTB=0b00100101;             /*Sending the data '2' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
  PORTB=0b00001101;             /*Sending the data '3' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
  PORTB= 0b10011001;            /*Sending the data '4' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
  PORTB = 0b01001001;           /*Sending the data '5' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
  PORTB = 0b11000001;          /*Sending the data '6' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
  PORTB = 0b00011111;          /*Sending the data '7' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
  PORTB = 0b00000001;          /*Sending the data '8' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
  PORTB = 0b00011001;          /*Sending the data '9' to LED2 and enabling the clock to display it */
  asm BSF PORTA,3
  Delay_ms(500);
  asm BCF PORTA,3
  Delay_ms(500);
 
  loop = loop + 1 ;       /*incrementing the loop variable */
 
  if(loop == 1)          /* checking the loop condition   */
  {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b10011111;     /*Sending the data '1' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
  }
 
  if(loop == 2)
  {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b00100101;      /*Sending the data '2' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
   }
 
   if(loop == 3)
   {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b00001101;    /*Sending the data '3' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
   }
 
   if(loop == 4)
   {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b10011001;    /*Sending the data '4' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
   }
 
  if(loop == 5)
  {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b01001001;   /*Sending the data 5' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
  }
 
 
  if(loop == 6)
  {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b11000001;    /*Sending the data '6' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
  }
 
 
  if(loop == 7)
  {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b00011111;    /*Sending the data '7' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
  }
 
 
  if(loop == 8)
  {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b00000001;    /*Sending the data '8' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
  }
 
 
  if(loop == 9)
  {
   asm BCF PORTA,4
   Delay_ms(500);
   PORTB=0b00011001;    /*Sending the data '9' to LED1 and enabling the clock to display it */
   asm BSF PORTA,4
   asm BCF PORTA,4;
  }
 
 
   }
 }

---

 

[betwixt]

1. What does the clock signal do? You have given no indication of the hardware you are using.
2. Did you intend to write this in 'C' or in assembly language, it is a curious mix of the two.

Brian.

 

[nav28ge]

1. What does the clock signal do? You have given no indication of the hardware you are using.
2. Did you intend to write this in 'C' or in assembly language, it is a curious mix of the two.

Brian.

Hi brian,

Thank you for reply, my programme is in micro c, regarding my circuit is a 7segment counter. it counts from 0 to 99 I have used pic16F84A and a flip flop connected to it, everything working it is counting from 0-99. It is not reseting after it counts 99. Give me some idea how to reset it back yo start grom 0 again.

 

[betwixt]

It is VERY far from well written but I think what you are needing is an extra step at the end of all your loops saying:

if(loop == 10) loop = 0;

Take my advice and get rid of all those 'asm' statements and replace them with instructions in 'C' instead. Also use names for the bits instead of their values and consider a switch(loop) construct instead of lots of 'if' lines. You can make the program much smaller and far more readble if you do these simple things.

Brian.