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PIC18F26K80 strange delay_ms() problem

 
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kahnm



Joined: 30 Apr 2007
Posts: 9

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PIC18F26K80 strange delay_ms() problem
PostPosted: Fri Dec 19, 2014 11:10 am     Reply with quote
Processor PIC18F26K80
Compiler Version 4.141

delay_ms(250) seems to work in the following LED blink demo code but delay_ms(500) does not. No blinking occurs.

What's going on?

In other code (not for this processor) I've used more than a byte in delay_ms.

Any help will be greatly appreciated.

Code:

//PIC18F26JK80
#include <18F26K80.h>

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES WDT128                   //Watch Dog Timer uses 1:128 Postscale
#FUSES VREGSLEEP_SW             //Ultra low-power regulator is enabled
#FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES LP                       //Low power osc < 200 khz
#FUSES NOBROWNOUT               //No brownout reset
#FUSES WDT_NOSLEEP              //Watch Dog Timer, disabled during SLEEP
#FUSES INTRC_IO                  //RA6 & RA7 are IO

#use delay(clock=16000000)

#use FIXED_IO( A_outputs=PIN_A7)



void main()
{

   setup_oscillator(OSC_16MHZ|OSC_INTRC|OSC_31250|OSC_PLL_OFF);

   while(1)
   {
   
      OUTPUT_LOW(PIN_A7);
   
      delay_ms(500); 
   
      OUTPUT_HIGH(PIN_A7);
   
      delay_ms(500); 
   
   }

}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Dec 19, 2014 11:30 am     Reply with quote
Get rid of the fuse shown in bold below. You are enabling the WDT:
Quote:
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES VREGSLEEP_SW //Ultra low-power regulator is enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES LP //Low power osc < 200 khz
#FUSES NOBROWNOUT //No brownout reset
#FUSES WDT_NOSLEEP //Watch Dog Timer, disabled during SLEEP
#FUSES INTRC_IO //RA6 & RA7 are IO
Ttelmah



Joined: 11 Mar 2010
Posts: 19339

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PostPosted: Fri Dec 19, 2014 12:07 pm     Reply with quote
also LP. There should only be one oscillator fuse.
kahnm



Joined: 30 Apr 2007
Posts: 9

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PostPosted: Fri Dec 19, 2014 1:09 pm     Reply with quote
Took out the watchdog and that solved it.
Also took out LP.

Thanks a million!
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