Using halscope, determine whether the problem could be contact bounce.
Display the home switch signal, trigger on rising or falling edge, and
then activate the switch (either by poking it manually or by running the
homing procedure)
If it is contact bounce, then consider using hal's debounce component as
a fix.
Here are some hal fragments related to debouncing a home switch:
loadrt debounce cfg=3
...
addf parport.read-all
addf debounce.0 servo-thread
...
net xhome-raw <= parport.0.pin-15-in => debounce.0.0.in
net xhome-filtered debounce.0.1.out => axis.0.home-sw-in
If necessary, you can
setp debounce.0.delay NNN
to change the amount of debounce; the default is apparently 5, which
means the switch input to emc has to be stable for 5 servo periods
before the debounce output changes.
Jeff
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