probe: Create a probe:z_virtual_endstop pin

Create a virtual pin that may be used as the z endstop pin on
cartesian printers that use the probe in place of a z endstop.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 8 insertions, 1 deletions

diff --git a/config/example-extras.cfg b/config/example-extras.cfg
index 9a792afa..bd39e99b 100644
--- a/config/example-extras.cfg
+++ b/config/example-extras.cfg
@@ -2,11 +2,18 @@
 # additional devices that may be configured on a printer. The snippets
 # in this file may be copied into the main printer.cfg file. See the
 # "example.cfg" file for description of common config parameters.
+#
+# Note, where an extra config section creates additional pins, the
+# section defining the pins must be listed in the config file before
+# any sections using those pins.
 
 
 # Z height probe. One may define this section to enable Z height
 # probing hardware. When this section is enabled, PROBE and
-# QUERY_PROBE extended g-code commands become available.
+# QUERY_PROBE extended g-code commands become available. The probe
+# section also creates a virtual probe:z_virtual_endstop pin. One may
+# set the stepper_z endstop_pin to this virtual pin on cartesian style
+# printers that use the probe in place of a z endstop.
 #[probe]
 #pin: ar15
 #   Probe detection pin. This parameter must be provided.