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.