[Gumstix-users] How to read in PWM on Robostix

[Marq R. <mar...@ya...>]

I have been researching how to input 7-channel RC (radio control) data into
the robostix but have come across a problem. I am working with a JR Propo
7-channel spcm receiver and after looking into the information Dave Hylands
gives for inputting RC data on the wiki I am not sure I can follow the same
procedure. I am unable to find any information on the chips inside my
receiver so that I can locate where each channel is output. 
The largest chip on the receiver has the following 3 part numbers on it:
402082,   sc442114,  xctab513e
Searching the SC part number I came up with a page that said Motorola but
was unable to find out anything about it. If anyone knows where I can find
some info about this chip that would be great.

Because I could not access the receiver like Dave did, I decided that I
would read in each channels PWM value and decode it this way. I tried to
read the values in on the a2d channels, but could not get anything. I
imagine it is because the signal is a PWM value, so I was wondering what
abilities do I have to read this signal in? Can I use the GPIO ports to
decode this? If so how would I calculate the value? Would I want to look for
the time in between each pulse or could I read the average voltage and do my
own a2d conversion?

Thanks for your help
-Marq 
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