YASD (yet another servo driver)

JonnyMac

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

What features distinguish your servo driver from the other ones in the ObEx?

JonnyMac

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

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

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

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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