Module servo - Servo wrapper functions

Servo wrapper functions.

Index

Declarations

servo.module:27Protocol SERVO

PROTOCOL SERVO

Servo control protocol.

servo.module:31Tag max

max ; INT

Maximum time active; in microseconds.

Parameters:

INT max Initially 2300. must be less than frequency.

servo.module:34Tag min

min ; INT

Minimum time active; in microseconds.

Parameters:

INT min Initially 700. must be more than 0.

servo.module:37Tag div

div ; INT

Number of divisions in the span between max - min.

Parameters:

INT div Initially 180. Must be <= max - min.

servo.module:40Tag pos

pos ; INT

Positition of the servo; This is what you will be using the most.

Parameters:

INT pos Initially 90. Must be between 0:pos.

servo.module:47Tag usec

usec ; INT

Number of microseconds (greater than min) the pulse to the servo will last.

We strongly recommend using [@code div] and [@code pos] to effect the position of the servo.

Parameters:

INT usec Automatically calculated when pos is reset.

servo.module:53Tag frequency

frequency ; INT

Frequency of the servo pulse.

Do not change this casually. Most servos require a pulse once every 20 milliseconds, which is what frequency defaults to.

Parameters:

INT frequency Initially 20000. Measured in microseconds.

servo.module:59Tag start

start

Starts servo operations.

We recommened setting div and pos before sending the start signal, and not changing div after.

servo.module:62Tag stop

stop

Supposed to stop servo operations. We've not added that functionality yet.

servo.module:75Process servo

PROC servo (VAL INT board.pin, CHAN SERVO s?)

General servo control. Pass a PWM pin and SERVO channel into this process, and all signals sent over the channel will be acted upon properly.

Parameters:

VAL INT board.pin The board pin to be used for servo operations. For the time being, only PWM pins connected to a 16 bit timer can be used to operate servos.
CHAN SERVO s The servo channel used for controlling servo operations.

servo.module:150Process simple.servo

Stepping-stone servo control process. The idea is this is a simpler process to work with servos than the PROTOCOL. You need to know your servo's bounds for this one, but it does allow for a single-channel servo control.

Parameters:

VAL INT board.pin The board pin to be used for servo operations. For the time being, only PWM pins connected to a 16 bit timer can be used to operate servos.
VAL INT umin The shortest pulse the servo is designed to recieve.
VAL INT umax The longest pluse the servo is designed to recieve.