Aww heck. May as well throw in my novice mistake. The only thing in my 
favour is that I am a novice... !

Took a few days getting my home-rolled C18 Code to work for driving an 
HD44780 based LCD Module (remember that Contrast thread a short while 
back...).
Anyways, I got it all working, then decided to "neaten" it up a bit. I 
changed the Crystal as well (from a 4MHz to 4.194304Mhz + PLL). One of 
the neatinging things I did was to migrate from using PORTD to LATD for 
the LCD pins.

Well, everything LCD stopped working even though it all looked good 
still in the Simulator. Just could not figure it out even though my 
flashing LED was flashing.

Took me a day to realize that using LATD for the setting LCD data lines 
was fine, just so long as you then use PORTD to read the busy flag! It 
so happened that because most (all) of my LCD code was writing the low 
128 characters, that LATDbits.LATD7 was always "not busy"... even though 
PORTDbits.RD7 was, so my init routine was way messed up...

Rolf

Wouter van Ooijen wrote:
>> Or were you specifically interested in electrical mistakes? :)
>>     
>
> I prefer bug-finding mistakes, but of course one sometimes has to debug
> his own mindset.
>
> Wouter van Ooijen
>
> -- -------------------------------------------
> Van Ooijen Technische Informatica: www.voti.nl
> consultancy, development, PICmicro products
> docent Hogeschool van Utrecht: www.voti.nl/hvu
>   

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