mcu: Remove max_stepper_error config parameter

Use a regular code constant - MAX_STEPCOMPRESS_ERROR in stepper.py.

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

docs/Config_Changes.md

@@ -8,6 +8,9 @@ All dates in this document are approximate.
 
 ## Changes
 
+20251003: Support for the undocumented `max_stepper_error` option in
+the `[printer]` config section has been removed.
+
 20250916: The definitions of EI, 2HUMP_EI, and 3HUMP_EI input shapers
 were updated. For best performance it is recommended to recalibrate
 input shapers, especially if some of these shapers are currently used.

klippy/mcu.py

@@ -603,9 +603,6 @@ class MCU:
         self._restart_cmds = []
         self._init_cmds = []
         self._mcu_freq = 0.
-        # Move command queuing
-        self._max_stepper_error = config.getfloat('max_stepper_error', 0.000025,
-                                                  minval=0.)
         self._reserved_move_slots = 0
         # Stats
         self._get_status_info = {}
@@ -871,8 +868,6 @@ class MCU:
         return self.print_time_to_clock(t) + slot
     def seconds_to_clock(self, time):
         return int(time * self._mcu_freq)
-    def get_max_stepper_error(self):
-        return self._max_stepper_error
     def min_schedule_time(self):
         return MIN_SCHEDULE_TIME
     def max_nominal_duration(self):

klippy/stepper.py

@@ -16,6 +16,7 @@ class error(Exception):
 
 MIN_BOTH_EDGE_DURATION = 0.000000500
 MIN_OPTIMIZED_BOTH_EDGE_DURATION = 0.000000150
+MAX_STEPCOMPRESS_ERROR = 0.000025
 
 # Interface to low-level mcu and chelper code
 class MCU_stepper:
@@ -122,8 +123,7 @@ class MCU_stepper:
         self._get_position_cmd = self._mcu.lookup_query_command(
             "stepper_get_position oid=%c",
             "stepper_position oid=%c pos=%i", oid=self._oid)
-        max_error = self._mcu.get_max_stepper_error()
-        max_error_ticks = self._mcu.seconds_to_clock(max_error)
+        max_error_ticks = self._mcu.seconds_to_clock(MAX_STEPCOMPRESS_ERROR)
         ffi_main, ffi_lib = chelper.get_ffi()
         ffi_lib.stepcompress_fill(self._stepqueue, self._oid, max_error_ticks,
                                   step_cmd_tag, dir_cmd_tag)