/
glue.py
49 lines (42 loc) · 1.5 KB
/
glue.py
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
#
# libms5803 - MS5803 pressure sensor library
#
# Copyright (C) 2014-2016 by Artur Wroblewski <wrobell@pld-linux.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
from _ms5803 import ffi
class Sensor(object):
"""
MS5803 sensor communication interface.
"""
def __init__(self, f_dev, address):
"""
Initialize pressure sensor and read its calibration coefficients.
:param f_dev: I2C device filename, i.e. /dev/i2c-0.
:param address: I2C device address, i.e. 0x77.
"""
self._lib = ffi.dlopen('libms5803.so.0')
self._lib.ms5803_init(f_dev, address)
self._p_value = ffi.new('int32_t *')
self._t_value = ffi.new('int32_t *')
def read(self):
"""
Read pressure and temperature from sensor.
"""
px = self._p_value
tx = self._t_value
self._lib.ms5803_read(px, tx)
return px[0], tx[0]
# vim: sw=4:et:ai