NAME

       counter - counts input pulses (DEPRECATED)

SYNOPSIS

       loadrt counter [num_chan=N]

DESCRIPTION

       counter is a deprecated HAL component and will be removed in a future release.  Use the encoder component
       with encoder.X.counter-mode set to TRUE.

       counter  is  a  HAL  component that provides software- based counting that is useful for spindle position
       sensing and maybe other things.  Instead of using a real encoder that  outputs  quadrature,  some  lathes
       have  a  sensor  that  generates  a  simple pulse stream as the spindle turns and an index pulse once per
       revolution.  This component simply counts up when a "count" pulse (phase-A) is received, and if reset  is
       enabled, resets when the "index" (phase-Z) pulse is received.

       This  is of course only useful for a unidirectional spindle, as it is not possible to sense the direction
       of rotation.

       counter conforms to the "canonical encoder" interface described in the HAL manual.

FUNCTIONS

       counter.capture-position (uses floating-point)
              Updates the counts, position and velocity outputs based on internal counters.

       counter.update-counters
              Samples the phase-A and phase-Z inputs and updates internal counters.

PINS

       counter.N.phase-A bit in
              The primary input signal.  The internal counter is incremented on each rising edge.

       counter.N.phase-Z bit in
              The index input signal.  When the index-enable pin is TRUE and a rising edge on phase-Z  is  seen,
              index-enable is set to FALSE and the internal counter is reset to zero.

       counter.N.index-enable bit io
       counter.N.reset bit io
       counter.N.counts signed out
       counter.N.position float out
       counter.N.velocity float out
              These pins function according to the canonical digital encoder interface.

       counter.N.position-scale float rw
              This parameter functions according to the canonical digital encoder interface.

       counter.N.rawcounts signed ro
              The  internal  counts  value, updated from update-counters and reflected in the output pins at the
              next call to capture-position.

SEE ALSO

       encoder(9). in the LinuxCNC documentation.

LinuxCNC Documentation                             2007-01-19                                         COUNTER(9)