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How do I blink an LED?...

 
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Guest
How do I blink an LED?...
PostPosted: Sat Oct 14, 2006 12:12 am     Reply with quote
New to the world of PICs... Ive got a 16f628A, how do I blink an LED so many times? Ive got VSS and VDD connected,wanna use internal clock, and LED is connected to RA2..

Can someone show me an example?
Guest
PostPosted: Sat Oct 14, 2006 1:53 am     Reply with quote
I wrote this code for it but I don't know whats going on but it seems to just hang at the delay.. am I missing something? The LED goes on, but doesnt go off =/

Code:
#include <16F628A.h>
#use delay (clock=4000000)
#fuses INTRC

 main()

 {
int x = 0;

   output_high(PIN_A2);
   delay_ms(1000);
   output_low(PIN_A2);

 }
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Oct 14, 2006 1:59 am     Reply with quote
Use the program in this post as a guide:
http://www.ccsinfo.com/forum/viewtopic.php?t=24160&start=5
Ttelmah
Guest
PostPosted: Sat Oct 14, 2006 2:47 am     Reply with quote
As a comment to 'why is the LED staying on', it isn't, but the 'off' period is only going to be perhaps 3uSec, so you will never see it...

Best Wishes
linux123



Joined: 09 Oct 2006
Posts: 17

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Ok
PostPosted: Tue Oct 24, 2006 8:44 am     Reply with quote
This code, it's correct:

#include <16F628A.h>
#use delay (clock=4000000)
#fuses INTRC

main()

{
output_high(PIN_A2);
delay_ms(1000);
output_low(PIN_A2);
delay_ms(1000);
}
sjbaxter



Joined: 26 Jan 2006
Posts: 141
Location: Cheshire, UK

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PostPosted: Tue Oct 24, 2006 10:24 am     Reply with quote
Almost there linux123....

The LED will only flash once then hit a sleep statement (added by the compiler). You need to put the code in a 'never ending' while loop. i.e

Code:
#include <16F628A.h>
#use delay (clock=4000000)
#fuses INTRC

main()
{
    while(TRUE)
    {
        output_high(PIN_A2);
        delay_ms(1000);
        output_low(PIN_A2);
        delay_ms(1000);
    }
}


or use a for loop to stop a 'condition always TRUE' compiler warning

Code:

    for (;;)
    {
        ....
    }

_________________
Regards,
Simon.
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