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delay_ms wrong time execution

 
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aasanchez



Joined: 17 May 2013
Posts: 8

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delay_ms wrong time execution
PostPosted: Fri May 17, 2013 2:48 pm     Reply with quote
a couple of days I'm trying ccs, but tests have been somewhat unproductive, I'm trying to make a basic code test, something simple like a flashing LED, but delay_ms time base does not work properly ...

Annex the code:

Code:
#include <18F2550.h>
#fuses HS,NOWDT,NOPUT,NOLVP,BROWNOUT,NOCPD,NOWRT
#use delay(clock=20000000)

void main()
{
   while (TRUE)
   {
   output_HIGH(PIN_B0);
   delay_ms(100);
   output_LOW(PIN_B0);
   delay_ms(100);
   }
}


Picture of schematic:
http://uploadpie.com/DsMtv

Video: http://telly.com/NF37WS

CCS Version: 4.140
Mike Walne



Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK

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PostPosted: Fri May 17, 2013 3:19 pm     Reply with quote
Several things.

1) What is the measured LED blink frequency?
2) What is the measured oscillator frequency?
3) You haven't got a power supply decoupling capacitor close to the PIC!

Mike
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri May 17, 2013 3:27 pm     Reply with quote
Add this to your #fuses statement:
Code:
CPUDIV1
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