EOFFSET_PER_ANGLE(9)

NAME
eoffset_per_angle - Compute External Offset Per Angle

SYNOPSIS

loadrt eoffset_per_angle [count=N|names=name1[,name2...]]

DESCRIPTION

An offset is computed (from one of several functions) based on an input angle in degrees. The angle could be a rotary coordinate value or a spindle angle.

The computed offset is represented as an s32 kcounts output pin that is a compatible input to external offset pins like axis.L.eoffset-counts where L is the coordinate letter. Scaling of the s32 kcounts is controlled by the input (k) — its reciprocal value is presented on an output pin kreciprocal for connection to axis.L.eoffset-scale. The default value for k should be suitable for most uses.

The built-in functions use pins fmult and rfraction to control the output frequency (or number of polygon sides) and amplitude respectively. The rfraction pin controls the offset amplitude as a fraction of the radius-ref pin.

One of the four built-in functions is specified by the fnum pin:

    • 0: f0 inside polygon (requires fmult == nsides ≥ 3)

    • 1: f1 outside polygon (requires fmult == nsides ≥ 3)

    • 2: f2 sinusoid

    • 3: f3 square wave

Unsupported fnum values default to use function f0.

FUNCTIONS

eoffset-per-angle.N (requires a floating-point thread)

PINS

eoffset-per-angle.N.active bit in (default: 0)
    From: motion.eoffset-active

eoffset-per-angle.N.is-on bit in (default: 0)
    From: halui.machine.is-on

eoffset-per-angle.N.enable-in bit in (default: 0)
    Enable Input

eoffset-per-angle.N.radius-ref float in (default: 1)
    Radius reference (see notes)

eoffset-per-angle.N.angle float in (default: 0)
    Input angle (in degrees)

eoffset-per-angle.N.start-angle float in (default: 0)
    Start angle (in degrees)

eoffset-per-angle.N.fnum s32 in (default: 0)
    Function selector (default 0)

eoffset-per-angle.N.rfraction float in (default: 0.1)
    Offset amplitude (+/- fraction of radius_ref)

eoffset-per-angle.N.fmult float in (default: 6)
    Offset frequency multiplier

eoffset-per-angle.N.k u32 in (default: 10000)
    Scaling Factor (if 0, use 10000)

eoffset-per-angle.N.is-off bit out
    invert is_on (for convenience)

eoffset-per-angle.N.enable-out bit out
    To: axis.L.eoffset-enable

eoffset-per-angle.N.clear bit out
    To: axis.L.eoffset-clear

eoffset-per-angle.N.kcounts s32 out
    To: axis.L.eoffset-counts

eoffset-per-angle.N.kreciprocal float out
    To: axis.L.eoffset-scale (1/k)

eoffset-per-angle.N.eoffset-dbg float out
    offset (debug pin—use kcounts & kreciprocal)

eoffset-per-angle.N.state-dbg u32 out
    state (debug pin)

EXAMPLES

An example simulation configuration is provided at: configs/sim/axis/external_offsets/opa.ini. A simulated XZC machine uses the C coordinate angle to offset the transverse X coordinate according to the selected fnum function.

NOTES

radius-ref
    The computed offsets are based on the radius-ref pin value. This pin may be set to a constant radius value or controlled by a user interface or by g code program (using M68 and a motion.analog-out-NN pin for instance).

Stopping
    When the enable-in pin is deasserted, the offset is returned to zero respecting the allocated acceleration and velocity limits. The allocations for coordinate L are typically controlled by an ini file setting:

    [AXIS_L]
    OFFSET_AV_RATIO=...

If unsupported parameters are supplied to a function (for instance a polygon with fewer than three sides), the current offset will be returned to zero (respecting velocity and acceleration constraints). After correcting the offending parameter, the enable-in pin must be toggled to resume offset computations.

AUTHOR

Dewey Garrett

LICENSE

GPL