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#fuses not working as expected - 18F24K22

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RLScott

Joined: 10 Jul 2007
Posts: 465

#fuses not working as expected - 18F24K22

Posted: Wed Dec 14, 2011 10:16 pm

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I am running the latest (4.128) PCH with MPLAB as the IDE, and #fuses don't seem to work on all the bits. In particular, I can't enable the WDT. My fuses statement is:

Code:

#fuses XT,NOPROTECT,NOLVP,NOFCMEN,NOIESO,WDT,WDT4096,PLLEN,BROWNOUT,NOPBADEN

The single source file has a #device PIC18F24K22 (instead of the full .h include) because I am not using any library functions.

After cleaning the project and doing a make (F10 on MPLAB) I look at the Config bits in MPLAB and they always say "Watchdog timer is always disabled. SWDTEN has no effect." Also this is confirmed by examining the .HEX file produced and seeing that it contains:

:0E0000000031193400BD000003C003E00340CE

The "34" after the "3119" is CONFIG2H.

Any idea what I am doing wrong? This always worked find on midrange projects (PCM) but this is my first PCH project.
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Robert Scott
Real-Time Specialties
Embedded Systems Consulting

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Thu Dec 15, 2011 12:03 am

See this post about fuses and Debug/Release mode. It may apply to your problem: http://www.ccsinfo.com/forum/viewtopic.php?t=46950&start=6

RLScott

Joined: 10 Jul 2007
Posts: 465

Posted: Thu Dec 15, 2011 5:00 am

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PCM programmer wrote:

See this post about fuses and Debug/Release mode. It may apply to
your problem:
http://www.ccsinfo.com/forum/viewtopic.php?t=46950&start=6

Yup, that was it. After changing the build configuration to "Release", all the config bit settings responded as expected to the #fuses statement. Thanks.
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Robert Scott
Real-Time Specialties
Embedded Systems Consulting

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