/
data_logger.py
139 lines (113 loc) · 3.97 KB
/
data_logger.py
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from serial import Serial
import logging
class DataLogger(object):
def __init__(self, device=None):
if device == None:
# TODO: Look for device more intelligently
device = '/dev/ttyACM0'
self._dev = Serial(device, baudrate=115200)
def _write_cmd(self, cmd):
logging.debug('command: %s' % cmd)
self._dev.write(cmd + '\n')
def _read_reply(self):
while True:
l = self._dev.readline().strip()
if len(l.strip()) == 0:
return
else:
logging.debug('reply: %s' % l)
yield l
def _read_single_reply(self):
""" Read a single-line reply """
reply = list(self._read_reply())
if len(reply) != 1:
raise RuntimeError('invalid reply: %s' % reply)
return reply[0]
def _read_reply_value(self):
reply = self._read_single_reply()
return reply.split('=')[1].strip()
def get_firmware_version(self):
self._write_cmd('V')
return self._read_reply_value()
def get_device_id(self):
self._write_cmd('I')
return self._read_reply_value()
def set_verbose(self, verbose):
self._write_cmd('v=%d' % verbose)
return bool(int(self._read_reply_value()))
def get_sample_count(self):
self._write_cmd('n')
return int(self._read_reply_value())
def _parse_sample(self, line):
l = line.split()
if len(l) != 4:
raise RuntimeError("Invalid sample line")
time = int(l[0])
sensor = int(l[1])
measurable = int(l[2])
value = float(l[3])
return (time, sensor, measurable, value)
def fetch_sample_chunk(self, start, count):
self._write_cmd('g %d %d' % (start, count))
for l in self._read_reply():
yield self._parse_sample(l)
def fetch_samples(self, start, count):
chunk_sz = 100
i = start
while i < start+count:
c = min(chunk_sz, i-start+count)
for s in self.fetch_sample_chunk(i, c):
yield s
i += c
def erase_samples(self):
self._write_cmd('n!')
return self._read_reply_value()
def set_acquisition_state(self, running):
self._write_cmd('a=%d' % running)
return bool(int(self._read_reply_value()))
def get_acquisition_state(self):
self._write_cmd('a')
return bool(int(self._read_reply_value()))
def identify_flash(self):
self._write_cmd('Fi')
return self._read_single_reply()
def get_rtc_time(self):
self._write_cmd('t')
return int(self._read_reply_value())
def set_rtc_time(self, time):
self._write_cmd('t=%d' % time)
return self._read_single_reply()
def get_last_sample(self):
self._write_cmd('l')
for l in self._read_reply():
yield self._parse_sample(l)
def force_sample(self):
self._write_cmd('f')
self._read_reply()
def set_sample_period(self, period):
""" set sample period in seconds """
self._write_cmd('T=%d' % (period * 1000))
self._read_reply()
def get_sample_period(self):
""" get sample period in seconds """
self._write_cmd('T')
return int(self._read_reply_value()) / 1000.
def list_sensors(self):
self._write_cmd('s')
for l in self._read_reply():
parts = l.split('\t')
sensor_id = int(parts[0])
name = parts[1]
yield (sensor_id, name)
def list_sensor_measurables(self, sensor_id):
self._write_cmd('m %d' % sensor_id)
for l in self._read_reply():
parts = l.split('\t')
meas_id = int(parts[0])
name = parts[1]
unit = parts[2]
yield (meas_id, name, unit)
def get_last_sample(self):
self._write_cmd('l')
for l in self._read_reply():
yield self._parse_sample(l)