Problem with Servo control or Servo32v3

GeorgeCollins

I am using the Prop Object Servo32v3 to control servos. I using a spin studio board connected to a CrustCrawler Quadruped, which has 8 hobby servos.

If I do the following code:

CON
    _clkmode = xtal1 + pll16x                           
    _xinfreq = 5_000_000                                'Note Clock Speed for your setup!!


OBJ
  Servo : "Servo32v3"

PUB Main
  Servo.start
  Servo.Set(0,1000)
  Servo.Set(2,1000)

Servo 0 sets but Servo 2 doesn't

If I reverse the order

CON
    _clkmode = xtal1 + pll16x                           
    _xinfreq = 5_000_000                                'Note Clock Speed for your setup!!


OBJ
  Servo : "Servo32v3"

PUB Main
  Servo.start
  Servo.Set(2,1000)
  Servo.Set(0,1000)

Servo 2 sets but not servo 1. Both servos obviously work and are connected. Why does it matter what order I set the servos in? How do I set multiple servos at the same time?

The prop and servos have different power supplies, and I do not think current drain is the issue.

Thank you for your help.
George Collins

Mike Green

I believe you have to call Servo.set once for each servo's initial position prior to calling Servo.start.
Read the comments in the source code for the included demo program.

Beau Schwabe

GeorgeCollins,

Mike is correct, The Servo's must be preset to a known position before you start the servo routine. Doing this also provides information as to what pins you will be using for servo's creating a mask so that the other pins will be ignored from within the servo routine.

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

GeorgeCollins

Thank you, that solves it.