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# SPDX-License-Identifier: LGPL-3.0-or-later
# Copyright (C) 2020 Daniel Thompson
"""Step logger
~~~~~~~~~~~~~~
Capture and record data from the step counter
"""
import array
import os
import time
import wasp
from micropython import const
TICK_PERIOD = const(6 * 60)
DUMP_LENGTH = const(30)
DUMP_PERIOD = const(DUMP_LENGTH * TICK_PERIOD)
class StepIterator:
def __init__(self, fname, data=None):
self._fname = fname
self._f = None
self._d = data
def __del__(self):
self.close()
def __iter__(self):
self.close()
self._f = open(self._fname, 'rb')
self._c = 0
return self
def __next__(self):
self._c += 1
if self._c > (24*60*60) // TICK_PERIOD:
raise StopIteration
if self._f:
spl = self._f.read(2)
if spl:
return spl[0] + (spl[1] << 8)
self.close()
self._i = 0
if self._d and self._i < len(self._d):
i = self._i
self._i += 1
return self._d[i]
return 0
def close(self):
if self._f:
self._f.close()
self._f = None
class StepLogger:
def __init__(self, manager):
self._data = array.array('H', (0,) * DUMP_LENGTH)
self._steps = wasp.watch.accel.steps
try:
os.mkdir('logs')
except:
pass
# Queue a tick
self._t = int(wasp.watch.rtc.time()) // TICK_PERIOD * TICK_PERIOD
manager.set_alarm(self._t + TICK_PERIOD, self._tick)
def _tick(self):
"""Capture the current step count in N minute intervals.
The samples are queued in a small RAM buffer in order to reduce
the number of flash access. The data is written out every few hours
in a binary format ready to be reloaded and graphed when it is
needed.
"""
t = self._t
# Work out where we are in the dump period
i = t % DUMP_PERIOD // TICK_PERIOD
# Get the current step count and record it
steps = wasp.watch.accel.steps
self._data[i] = steps - self._steps
self._steps = steps
# Queue the next tick
wasp.system.set_alarm(t + TICK_PERIOD, self._tick)
self._t += TICK_PERIOD
if i < (DUMP_LENGTH-1):
return
# Record the data in the flash
walltime = time.localtime(t)
yyyy = walltime[0]
mm = walltime[1]
dd = walltime[2]
# Find when (in seconds) "today" started
then = int(time.mktime((yyyy, mm, dd, 0, 0, 0, 0, 0, 0)))
elapsed = t - then
# Work out how dumps we expect to find in today's dumpfile
dump_num = elapsed // DUMP_PERIOD
# Update the log data
try:
os.mkdir('logs/' + str(yyyy))
except:
pass
fname = 'logs/{}/{:02d}-{:02d}.steps'.format(yyyy, mm, dd)
offset = dump_num * DUMP_LENGTH * 2
try:
sz = os.stat(fname)[6]
except:
sz = 0
f = open(fname, 'ab')
# This is a portable (between real Python and MicroPython) way to
# grow the file to the right size.
f.seek(min(sz, offset))
for _ in range(sz, offset, 2):
f.write(b'\x00\x00')
f.write(self._data)
f.close()
# Wipe the data
data = self._data
for i in range(DUMP_LENGTH):
data[i] = 0
def data(self, t):
try:
yyyy = t[0]
except:
t = time.localtime(t)
yyyy = t[0]
mm = t[1]
dd = t[2]
fname = 'logs/{}/{:02d}-{:02d}.steps'.format(yyyy, mm, dd)
try:
os.stat(fname)
except:
return None
# Record the data in the flash
now = time.localtime(self._t)
if now[:3] == t[:3]:
latest = self._data
# Work out where we are in the dump period and update
# with the latest counts
i = self._t % DUMP_PERIOD // TICK_PERIOD
latest[i] = wasp.watch.accel.steps - self._steps
else:
latest = None
return StepIterator(fname, latest)
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