Futaba PCM strucutre

[iter]

I wonder if anyone has a description of Futaba's PCM protocol, either official or reverse-engineered. I cannot find anything useful on Google.

Ari.

[Alan Hopper]

Ari,
I decoded it on a pic a while ago

http://www.flightsense.nl/pcm1024/docs/pcm1024_signal_analyzed.pdf
I had another document but cannot find it now

I think there is some code somewhere in the sticky usb joystick thread at the top of this forum

My code had to jump through lots of extra hoops to fit it on a small pic and avoid the lookup table decoding. As a result it is very messy and not a good starting place.
Alan

[Alan Hopper]

Ari, just found the other document, I'm afraid I don't know where I originally found it. I vaguely remember that there were errors in one or other of these, I think to do with checksums. Also there are some descriptions on the web that state the frame rate is double the speed it really is.
Alan

[iter]

Alan, thank you for the documents! I feel stupid having asked for this info. I don't have any Futaba equipment to test this on if I implement it, and I have other features I want to add to my encoder before PCM1024.

Thank you again for your fast answer. I save these two documents on my disk so I can implement this protocol when it propagates to the top of the stack.

Ari.