Writing own bootloader

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liak
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Writing own bootloader

Post by liak » Tue May 12, 2009 12:24 pm

Dear all,

I am in need of a bootloader for 18F26K20. I have tried asking for it from Microcode studio. Earlier they responded to my requests for other PICs. But this time no response at all. Hmm. Guess I will have to work out one all by myself.. I am not familiar with this at all.

I remember reading someone from the forum writing his own bootloader. But the thread I have gotten showed me to "tiny bootloader" which doesn't help me much.

I wonder anyone who can remember can point me to the exact thread or give me a new guide on how to do this. Hopefully one which can explain it clearly enough for someone like me.
:oops:


Thanks.

Regards,
Liak

Doj
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Post by Doj » Tue May 12, 2009 4:04 pm

Hello liak,
Have a look on Microchip website for AN851.
This will tell you everything.

liak
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Post by liak » Tue May 12, 2009 10:49 pm

Dear Mark,

Thanks for the rescue.
Hmm. Didn't find that when I tried looking.

Regards,
Liak :)

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RadioT
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Post by RadioT » Tue May 12, 2009 11:56 pm

Hi Liak,

Try:

http://www.microchip.com/Stellent/idcpl ... e=en012031

I'm working on a bootloader myself for the 18F87J11.

73's,

de Tom

liak
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Post by liak » Sun May 17, 2009 11:05 pm

Dear Tom and Doj,
Thanks for the link. Already read the related AN851. But unfortunately not very good in C nor asm. Thinking of modifying the sample codes given in AN851 rather than writing it up from scratch. I think the 18F family basically shares all the same features, so this should be feasible, right? :?:
Haven't dived into the codes yet. How are you approaching this? If you are using same approach, can offer opinion on which segments to modify (meaning processor variable segments)?

Regards,
Liak

Doj
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Post by Doj » Mon May 18, 2009 12:44 am

I am soon to work on this for a commercial product.
It will be the hard way and learn the method and convert the code to SF.
If there are any real stumbling blocks I can let you know.

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