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16F88 bootloader problem

 
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SB



Joined: 15 Jan 2004
Posts: 10

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16F88 bootloader problem
PostPosted: Thu Oct 13, 2005 8:27 am     Reply with quote
I have looked at a selection of bootloaders (SparkFun Screamer, Tinybootloader, MicroCode Loader etc) all requiring the first 4 bytes to be a long jump to the start of my code. These all work fine when downloading nice little programs but unfortunately my program isn't!

I think my problem is that the start of my code is not on the first page. Because I am using part of my ROM as RAM and have some interrupt code.

Below is the top of my list file. (main() is actually at 0x0B3D)
Code:

0000:  MOVLW  08
0001:  MOVWF  0A
0002:  GOTO   33D


One solution I thought of was to jump to a location in the first page which then jumps to the start of my code. However I don't know how to implement this.

I've got a bit bogged down by this and would appreciate any suggestions.

I'm using the 16F88 with the latest CCS compiler.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Oct 14, 2005 1:52 pm     Reply with quote
Look at the last two posts in this thread on the Sparkfun forum.
It's something to try.
http://www.sparkfun.com/cgi-bin/phpbb/viewtopic.php?t=413&highlight=ccs
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