> XHC HB04 pendant has hal pin step-up, while it is more convienient way
> to approach some position by stepping increment down.
The hal component (src/hal/components/xhc-hb04.cc) provides
hal pins for button-step (output) and stepsize-up (input) that
are conventionally connected with the signal named pendant:step:
$ halcmd show signal pendant:step
Signals:
Type Value Name (linked to)
bit FALSE pendant:step
<== xhc-hb04.button-step
==> xhc-hb04.stepsize-up
With this connection, repeated presses of the step button will
increment the stepsize through one of the supported sequences:
(0.001,0.010,0.100,1.000) typ for mm-base machine
or
(0.001,0.005,0.010,0.020) typ for inch-base machine
After the largest increment, the sequence rolls over and restarts
at the smallest increment.
We could implement an additional stepsize-down input for use
instead of stepsize-up but I am not sure it is a good idea. If
the user does not carefully note the displayed increment value
and pushes the step button to do stepsize-down, a rollover to
the largest increment may be a big surprise when the user next
clicks the MPG.
When using the current implementation with stepsize-up, an
inadvertent rollover to the smallest increment may be a surprise
but is less likely to crash a machine.
The existing implementation aligns with the button names on the
pendant and is simple. Cycling throught four stepsize increments
is fairly quick and encourages the user to look at the displayed
increment value when choosing a smaller increment. It seems to me
that adding provisions for stepsize-down would add complexity and
increase chances for operator error.
--
Dewey Garrett
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