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04-29-2003 08:24 PM  16 years ago
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Angelos

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nr Oxford, OX11, UK

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PCM1024Z protocol
I am happy to say that after weeks of extensive testing I have
figured out all the details of PCM1024Z protocol and I have developed
I fully working 10 channel PCM decoder. All features of PCM receivers
are implemented including battery failsafe, DSC, etc. See pictures of
the prototype here:

http://www.model-gadgets.com/tmp/pcm.htm

The decoder performed flawlessly for several hours with my computer
monitoring its outputs so I paired it with a GWS receiver front end
and took it in the air in my Zagi. Everything worked fine. The range
check is excellent (in fact better than my Futaba R149DP) so it is
time to go higher with an power model.

-Angelos
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04-29-2003 08:41 PM  16 years ago
irq

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San Diego, CA

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*drool*, Amazing. What can you do with the debug port? Actually, I'd really appreciate hearing any extra information you have on this
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04-29-2003 08:43 PM  16 years ago
z11355

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New England

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Really very impressive reverse engineering.
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04-29-2003 08:57 PM  16 years ago
Angelos

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nr Oxford, OX11, UK

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irq,
the debug port has ground and two programmable pins that help me check how the firmware works. I connect these to the oscilloscope and get the firmware to drive them so I can observe internal operations. One of these is programmed to generate one pulse for each frame that was received with errors so I can hook up a counter there and see how it performed in flight. The other pin generates a synchronization pulse that triggers the oscilloscope in order to lock at the beginning of the frame that I want. There are 4 different types of frames containing different information.

z11355,
don't call it reverse engineering because it is illegal In fact I did nothing more than observing the data stream then re-engineer a decoder
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04-29-2003 09:05 PM  16 years ago
z11355

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New England

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but thats allowed if that is how you did it (ie.
clean room external visibility)
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