binary down counter.... using PIC16F84A : 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes

Forums

8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes :: Forums :: Discuss and Learn :: PIC Microcontroller Discussion		<< Previous thread \| Next thread >>
binary down counter.... using PIC16F84A


Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

Author

Post

jimmymax2020

Tue Mar 04 2008, 06:20AM

Registered Member #6427

Joined: Tue Mar 04 2008, 05:55AM

Posts: 4
Thanked 0 times in 0 posts

i having problem of my work with input from portA (controls the descending count from 16 to 0) to the output portB (dispaly the binary out by turning on the led)....

i want to get input state from port A( on/off), if on the down counter start from letting all 4 LED's and soon, then the program loop itself back after all Led is off (or count zero)... if the state if off ( it holds the Led's state )....

here is my work program....

CODE:

void main() {

  int i=0;

  PORTB = 0;

  TRISB = 0;           // PORTB is output

  TRISA = 1;           // PORTA is input

  do {

  if (PORTA != 0x01)

            i++;

  Delay_ms(1000);

  switch (i) {

  case 1: PORTB = 0x0F;

  case 2: PORTB = 0x0E;

  case 3: PORTB = 0x0D;

  case 4: PORTB = 0x0C;

  case 5: PORTB = 0x0B;

  case 6: PORTB = 0x0A;

  case 7: PORTB = 0x09;

  case 8: PORTB = 0x08;

  case 9: PORTB = 0x07;

  case 10: PORTB = 0x06;

  case 11: PORTB = 0x05;

  case 12: PORTB = 0x04;

  case 13: PORTB = 0x03;

  case 14: PORTB = 0x02;

  case 15: PORTB = 0x01;

  case 16: PORTB = 0x00;

}

  Delay_ms(1000);

  } while (1);

}

using mikroC compiler.... it display some error...

how can i solve this porblem???????.....

[ Edited Tue Mar 04 2008, 06:25AM ]

Ajay

Tue Mar 04 2008, 06:26AM

Rickey's World Admin

Registered Member #1

Joined: Fri Feb 24 2006, 04:56AM

Posts: 3753
Thanked 696 times in 655 posts

may i know what error your are getting?

www.rickeyworld.info
If you feel satisfied with the user's forum reply please click on the thank button.

Obey forum rules!
Respect others!

sashijoseph

Tue Mar 04 2008, 10:42AM

Registered Member #5870

Joined: Mon Feb 04 2008, 06:26PM

Posts: 554
Thanked 124 times in 117 posts

Well I just copy-pasted your code in MicroC and its compiling fine without errors.
So start a new project,select the proper controller and default configuration.....should compile without problems.

Let there be music........

jimmymax2020

Tue Mar 04 2008, 09:57PM

Registered Member #6427

Joined: Tue Mar 04 2008, 05:55AM

Posts: 4
Thanked 0 times in 0 posts

thnks... it was an error of setting the clock..... now i have finish compiling it with a new project...

my problem now is that no output was generated when i start to on the portA after i put it to the ciruit board.....
so i developed another program.....

CODE:

void main ()

        {

  int i=0;

        while(1) // loop forever //

        {

        TRISB=0;

        TRISA=1;

          if (PORTA != 0x01)

                  i++;

  if (i=1)

  {delay_ms(1000);

   PORTB = 0x0F;

   delay_ms(1000);

  }

  if (i=2)

  {delay_ms(1000);

   PORTB = 0x0E;

   delay_ms(1000);

  }

  if (i=3)

  {delay_ms(1000);

   PORTB = 0x0D;

   delay_ms(1000);

  }

  if (i=4)

  {delay_ms(1000);

   PORTB = 0x0C;

   delay_ms(1000);

  }

  if (i=5)

  {delay_ms(1000);

   PORTB = 0x0B;

   delay_ms(1000);

  }

  if (i=6)

  {delay_ms(1000);

   PORTB = 0x0A;

   delay_ms(1000);

  }

  if (i=7)

  {delay_ms(1000);

   PORTB = 0x09;

   delay_ms(1000);

  }

  if (i=8)

  {delay_ms(1000);

   PORTB = 0x08;

   delay_ms(1000);

  }

  if (i=9)

  {delay_ms(1000);

   PORTB = 0x07;

   delay_ms(1000);

  }

  if (i=10)

  {delay_ms(1000);

   PORTB = 0x06;

   delay_ms(1000);

  }

  if (i=11)

  {delay_ms(1000);

   PORTB = 0x05;

   delay_ms(1000);

  }

  if (i=12)

  {delay_ms(1000);

   PORTB = 0x04;

   delay_ms(1000);

  }

  if (i=13)

  {delay_ms(1000);

   PORTB = 0x03;

   delay_ms(1000);

  }

  if (i=14)

  {delay_ms(1000);

   PORTB = 0x02;

   delay_ms(1000);

  }

  if (i=15)

  {delay_ms(1000);

   PORTB = 0x01;

   delay_ms(1000);

  }

  if (i=16)

  {delay_ms(1000);

   PORTB = 0x00;

   delay_ms(1000);

   i=0;

  }

  }

}

i have compile this without error and it thus work in counting down (binary)...
when i input on(or 1) to portA..... but then it continues to count down.... my main objective is to control the output if i input signal to portA.... if not it holds the last state......

is there a problem with my new code ?

[ Edited Wed Mar 05 2008, 08:23AM ]

Ajay

Wed Mar 05 2008, 08:37AM

Rickey's World Admin

Registered Member #1

Joined: Fri Feb 24 2006, 04:56AM

Posts: 3753
Thanked 696 times in 655 posts

instead of writing this

CODE:

if (PORTA != 0x01)

write

CODE:

if (PORTA & 0x01 !=  0x01)

move the following statements out of while(1) loop because they are to be configured only once at the starting of main program.

CODE:

TRISB=0;

TRISA=1;

I really don't know why aren't you getting any kind of error or something.. coz your if statements are wrong..

instead of

CODE:

if (i=14)

you have to write

CODE:

if (i==14)

for all if statements... Please make the changes and try again

www.rickeyworld.info
If you feel satisfied with the user's forum reply please click on the thank button.

Obey forum rules!
Respect others!

jimmymax2020

Wed Mar 05 2008, 03:29PM

Registered Member #6427

Joined: Tue Mar 04 2008, 05:55AM

Posts: 4
Thanked 0 times in 0 posts

i have compiled the changes you give... i have also tested in my circuit..... i just make the code:

if (PORTA & 0x01 != 0x00)

to satisfy the circuitry connection........

thanks....

i really appreciate the help.....