Subject:
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RE: CPR for RCX?
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Newsgroups:
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lugnet.robotics.rcx.pbforth
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Date:
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Mon, 1 Jul 2002 23:39:26 GMT
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Reply-To:
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<RHEMPEL@BMTS.COMspamless>
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Viewed:
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2723 times
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> I knew Assembler would come into play sooner or later. I have downloaded a
> copy of the H8/300 Assembly language spec. What I still don't understand is
> how you turn the object code into 'S'-type records with 'ld'?
ld is a linker. It takes the object code generated by the assebles
and "links" it together to form an image that can be loaded. The file:
ld/h8300_rcx.ld
specifies how the objects are stiched together.
> Can I assume the RCX has a ROM function to read the 'S' records from the IR
> port, convert them back into binary and load them into the firmware's memory
> locations?
No, the firmware uploader splits the S records into a special binary
format that the RCX ROM can understand.
> This helps. I can make out the assembly language syntax within the files, as
> long as TCL doesn't do anything fancy with the instructions, I should be okay.
> I'm glad you have chosen to use an ANS-compliant indirect threaded model with
> minimal core word set. This is makes it a lot easier to work with although the
> system as a whole will be slower.
Thank goodness I made ONE good decision :-) And yes it is slower but the
platform independence is a good thing. This is for educational purposes, not
crunching numbers in a reactor process. If you time some of the loops, you;ll
be surprised at how fast pbForth really is...
> The next thing I have to overcome is multi-tasking. I will gladly take on the
> challenge of writing an LCD updating, button monitoring application, but I need
> some way of keeping it independent of whatever main application is running. I
> might even try my hand at the WORKSHOP 3D Lego RCX Challenge when I get things
> working correctly.
There's some clues to multi-tasking in this tutorial. It's a simple method
of tasking but will do the job nicely...
<http://www.hempeldesigngroup.com/lego/pbForth/scripts/howtoRCXMusic.html>
Also, for clues on reading buttons and such, see:
<http://www.hempeldesigngroup.com/lego/pbForth/scripts/howtoRCXMonitor1.html>
Hope this helps.
Cheers, Ralph
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Message is in Reply To:
 | | Re: CPR for RCX?
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| (...) I knew Assembler would come into play sooner or later. I have downloaded a copy of the H8/300 Assembly language spec. What I still don't understand is how you turn the object code into 'S'-type records with 'ld'? (...) Can I assume the RCX has (...) (22 years ago, 1-Jul-02, to lugnet.robotics.rcx.pbforth)
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