blob: aae4b596de584917735affcfef08801481b02215 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
# SPDX-License-Identifier: LGPL-3.0-or-later
# Copyright (C) 2020 Daniel Thompson
"""Bosch BMA421 accelerometer driver
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"""
import bma42x
import time
class BMA421:
"""BMA421 driver
.. automethod:: __init__
"""
def __init__(self, i2c):
"""Configure the driver.
:param machine.I2C i2c: I2C bus used to access the sensor.
"""
self._dev = bma42x.BMA42X(i2c)
def reset(self):
"""Reset and reinitialize the sensor."""
dev = self._dev
# Init, reset, wait for reset, enable I2C watchdog
dev.init()
dev.set_command_register(0xb6)
time.sleep(0.20)
dev.set_reg(bma42x.NV_CONFIG_ADDR, 6);
# Configure the sensor for basic step counting
dev.write_config_file()
dev.set_accel_enable(True)
dev.set_accel_config(odr=bma42x.OUTPUT_DATA_RATE_100HZ,
range=bma42x.ACCEL_RANGE_2G,
bandwidth=bma42x.ACCEL_NORMAL_AVG4,
perf_mode=bma42x.CIC_AVG_MODE)
dev.feature_enable(bma42x.STEP_CNTR, True)
@property
def steps(self):
"""Report the number of steps counted."""
return self._dev.step_counter_output()
@steps.setter
def steps(self, value):
if value != 0:
raise ValueError()
# TODO: There is a more efficient way to reset the step counter
# but I haven't looked it up yet!
self.reset()
|
