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adxl345: Apply correct scaling for X,Y and Z axes 

According to ADXL345/ADXL343 datasheets, at 3.3V supply voltage,
which is most frequent in the various boards, the sensitivity of
X and Y axes changes to 265 LSB/g from 256 LSB/g at 2.5V.

Signed-off-by: Dmitry Butyugin <dmbutyugin@google.com>
This commit is contained in:
Dmitry Butyugin 2022-10-17 19:28:41 +02:00 committed by KevinOConnor
parent d46c95b758
commit 96ea871b35
1 changed files with 4 additions and 3 deletions
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7
klippy/extras/adxl345.py
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@ -24,7 +24,8 @@ ADXL345_DEV_ID = 0xe5
SET_FIFO_CTL = 0x90 SET_FIFO_CTL = 0x90
FREEFALL_ACCEL = 9.80665 * 1000. FREEFALL_ACCEL = 9.80665 * 1000.
SCALE = 0.0039 * FREEFALL_ACCEL # 3.9mg/LSB * Earth gravity in mm/s**2 SCALE_XY = 0.003774 * FREEFALL_ACCEL # 1 / 265 (at 3.3V) mg/LSB
SCALE_Z = 0.003906 * FREEFALL_ACCEL # 1 / 256 (at 3.3V) mg/LSB
Accel_Measurement = collections.namedtuple( Accel_Measurement = collections.namedtuple(
'Accel_Measurement', ('time', 'accel_x', 'accel_y', 'accel_z')) 'Accel_Measurement', ('time', 'accel_x', 'accel_y', 'accel_z'))
@ -231,8 +232,8 @@ class ADXL345:
self.printer = config.get_printer() self.printer = config.get_printer()
AccelCommandHelper(config, self) AccelCommandHelper(config, self)
self.query_rate = 0 self.query_rate = 0
am = {'x': (0, SCALE), 'y': (1, SCALE), 'z': (2, SCALE), am = {'x': (0, SCALE_XY), 'y': (1, SCALE_XY), 'z': (2, SCALE_Z),
'-x': (0, -SCALE), '-y': (1, -SCALE), '-z': (2, -SCALE)} '-x': (0, -SCALE_XY), '-y': (1, -SCALE_XY), '-z': (2, -SCALE_Z)}
axes_map = config.getlist('axes_map', ('x','y','z'), count=3) axes_map = config.getlist('axes_map', ('x','y','z'), count=3)
if any([a not in am for a in axes_map]): if any([a not in am for a in axes_map]):
raise config.error("Invalid adxl345 axes_map parameter") raise config.error("Invalid adxl345 axes_map parameter")