extruder: Initial support for "smoothed pressure advance"

Support averaging the extruder position over a time range to "smooth
out" the velocity changes that occur during pressure advance.

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

1 files changed, 6 insertions, 7 deletions

diff --git a/config/example.cfg b/config/example.cfg
index 25280a9b..ec648d77 100644
--- a/config/example.cfg
+++ b/config/example.cfg
@@ -130,13 +130,12 @@ filament_diameter: 3.500
 #   during deceleration. It is measured in millimeters per
 #   millimeter/second. The default is 0, which disables pressure
 #   advance.
-#pressure_advance_lookahead_time: 0.010
-#   A time (in seconds) to "look ahead" at future extrusion moves when
-#   calculating pressure advance. This is used to reduce the
-#   application of pressure advance during cornering moves that would
-#   otherwise cause retraction followed immediately by pressure
-#   buildup. This setting only applies if pressure_advance is
-#   non-zero. The default is 0.010 (10 milliseconds).
+#pressure_advance_smooth_time: 0.040
+#   A time range (in seconds) to use when calculating the average
+#   extruder velocity for pressure advance. A larger value results in
+#   smoother extruder movements. This parameter may not exceed 200ms.
+#   This setting only applies if pressure_advance is non-zero. The
+#   default is 0.040 (40 milliseconds).
 #
 # The remaining variables describe the extruder heater.
 heater_pin: ar10