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View Full Version : YASD (yet another servo driver)



JonnyMac
04-07-2009, 07:50 AM
I didn't find anything in the object exchange that would float my boat so -- to fill a need and as a learning exercise -- I wrote a Propeller servo driver. The driver portion is is Assembly and closely mimics they my servo VP for the SX works; just one servo pulse at a time. The driver supports from one to eight servos and position timing is expressed in microseconds.

I've been doing non-stop SX coding for the last three years so please go easy on me if you find something really silly; while I feel pretty confident in the code I'll wait to post in in OBEX to allow others that might be interested to wring it out.

Mike Green
04-07-2009, 07:59 AM
What features distinguish your servo driver from the other ones in the ObEx?

JonnyMac
04-07-2009, 08:11 AM
For my needs I wanted to specify 1 to 8 servos, a starting pin for the group, and set position in microseconds. Frankly, other than Beau's very advanced module I was a little surprised at what I found vis-a-vis servos for the Propeller. Honestly, I didn't think I'd have to write this but am glad I did because it turned into a useful education experience -- perhaps others will benefit from my code, and I'll learn more from the comments others may post.

shanghai_fool
04-07-2009, 01:00 PM
I don't know what more you could need that Beau's does not do. It will do from 1 to 32 servos and set position from 1000-2000 microseconds. You just have to give the set start position and which pin before calling the servo start command.

JonnyMac
04-07-2009, 01:24 PM
As I stated, a big part of this was as an educational exercise for myself. My projects will not require more than eight servos, and I wanted to have a driver that I could understand (Beau's a great coder and has a big head start on me).

Nick McClick
04-07-2009, 01:49 PM
I'm pretty good with SPIN but I'm still a PASM beginner - this looks like a good project to sharpen one's skills. Good stuff!

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