Provided by: linuxcnc-uspace_2.9.1-2ubuntu1_amd64
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.