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"The Codeloader" with application

 
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JBM



Joined: 12 May 2004
Posts: 54
Location: edinburgh, Scotland

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"The Codeloader" with application
PostPosted: Fri Nov 05, 2004 10:49 am     Reply with quote

I was pointed to The Codeloader yesterday, and have had great success so far, loading an application with it to my 18F452.

I saw a post a while ago about including the application code in the same .HEX file as the bloader, and now I can't find the it! If anyone knows how to do this, (i.e. make the application code over-writable and not the bloader) I'd appreciate some help.
Thanks in advance

-JBM
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Nov 08, 2004 3:30 pm     Reply with quote

If you want to prevent your application code from using the ROM
locations assigned to the bootloader, then do this:

#org 0x7C00, 0x7FFF {}

This is just an example. Edit the start address to reflect the
true starting address of your bootloader.
JBM



Joined: 12 May 2004
Posts: 54
Location: edinburgh, Scotland

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Clarification
PostPosted: Tue Nov 09, 2004 12:51 pm     Reply with quote

Thanks for your reply, but I probably should clarify:
I have the bootaloder compiled to one file ( codeloader.HEX ) and my application in another ( app.HEX ). I've #ORGed out the necessary memory locations so my app doens't overwrite the bloader, but this still means I have to program the PIC with the bloader, and then load the application separately. I can access the bloader from my application, but what I want is to be able to have one .HEX file with the application and the bloader ( to allow for future updates ).

Going down to the assumbly level is *icky* I feel, so any tips here would be appreciated.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Nov 09, 2004 1:49 pm     Reply with quote

I don't didn't look at the Codeloader source, but the web page
says it's written in CCS C. So you probably should be able to
include it in your application.

I once posted some bootloader code, in which the bootloader
and the application are in one project. Maybe if you look at
this page, it will answer your questions.
http://www.ccsinfo.com/forum/viewtopic.php?t=7791
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Tue Nov 09, 2004 2:33 pm     Reply with quote

The trick is to have the bootloader protect itself. Then you can include the bootloader in your application.
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