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trigger_analog: Support scaling the filter's initial start state

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Add a new set_start_state() method to MCU_SosFilter that can arrange
for the filter to better handle a non-zero initial starting state.

Also, this removes the previous 1.0 gram initial start state for load
cells as it tares the initial value.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2026-01-23 18:38:12 -05:00
parent 58cc059e31
commit 16755481cc
1 changed files with 8 additions and 1 deletions
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9
klippy/extras/trigger_analog.py
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@ -82,6 +82,7 @@ class MCU_SosFilter:
self._coeff_frac_bits = coeff_frac_bits
self._value_frac_bits = self._scale_frac_bits = 0
self._design = None
self._start_value = 0.
self._offset = 0
self._scale = 1
self._set_section_cmd = self._set_state_cmd = None
@ -154,10 +155,16 @@ class MCU_SosFilter:
% (nun_states,))
fixed_state = []
for col, value in enumerate(section):
fixed_state.append(to_fixed_32(value, self._value_frac_bits))
adjval = value * self._start_value
fixed_state.append(to_fixed_32(adjval, self._value_frac_bits))
sos_state.append(fixed_state)
return sos_state
# Set expected state when filter first starts (avoids filter
# "ringing" if sensor data has a known static offset)
def set_start_state(self, start_value):
self._start_value = start_value
# Set conversion of a raw value 1 to a 1.0 value processed by sos filter
def set_offset_scale(self, offset, scale, scale_frac_bits=0,
value_frac_bits=0):