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PWM problem with a PIC18f87 and PicKit3

 
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Microchiper



Joined: 01 Apr 2011
Posts: 1

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PWM problem with a PIC18f87 and PicKit3
PostPosted: Fri Apr 01, 2011 6:17 pm     Reply with quote

Dear all,

I'm using Pickit3 to interface my board, and when using the debugger, there is a strange behavior (or, let's say, one I don't understand). Indeed, when using the "watch" feature in MPLAB, and considering the CCP4 for example (pin n°3 of Port G), I always have:

PORTG = 0000 0000

even when my voltmeter proves me that it changes merely as expected.

But if, in the code, I add:

Code:
state = PORTGbits.CCP4;


then, the variable "state" switches regularly in a normal way in the "watch" window.

Note that when using the SIM mode of MPLAB, PORTG has at each time the correct output.

I need to understand what's wrong because I can see that my motor does not run the way it is supposed to do, and this is maybe a good start to find a solution.

Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Apr 03, 2011 3:28 pm     Reply with quote

There is no 18F87.

Since your question is mostly about MPLAB and Pickit3, you might get
more replies if you try the Pickit3 forum:
http://www.microchip.com/forums/f15.aspx
temtronic



Joined: 01 Jul 2010
Posts: 9226
Location: Greensville,Ontario

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PostPosted: Sun Apr 03, 2011 6:41 pm     Reply with quote

You should show us a complete but small program that shows the problem.

One item you must understand with MPLAB, is that you MUST recompile your program after you select 'release' in the build configuration menu.
You cannot properly program a PIC with your code while in the 'debug' mode.
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