mc68332 embedded programming problems

Apr 26, 2006 2 Replies
A

Hi all,



I am trying very unsuccessfully to load my code from my Flash into ram, and then jump to ram. I am finding 2 issues:



  1. I can only load so many bytes to ram before the system resets.
  2. when i make a jump to the code in ramspace, the chip wanders off and gets lost, not knowing where it is going. I have examined ram memory through the bdm port, and I find that the instructions are there just before the jump, but it hangs up when I jump.

Any help would be greatly appreciated.



Rob McPherson snipped-for-privacy@actarg.com



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R

This is not understood. Why does the system reset ? Is there a watchdog ?

Yes, this stuff is tricky. Consider interrupts, consider the stack, what code is loaded to RAM ? Was the code linked to run at the specified location ? With absolute or relative jumps within the code ? Are there segment registers ?

Rene

Ing.Buero R.Tschaggelar - http://www.ibrtses.com & commercial newsgroups - http://www.talkto.net
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A

Well, I fixed the first problem, it being a watchdog issue. Sorry about that part. The second is still an issue. Any help would be greatly appreciated.

Rob McPherson

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