54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
|
#!/usr/bin/env python
|
||
|
|
|
||
|
|
# Author: Brendan Le Foll <brendan.le.foll@intel.com>
|
||
|
|
# Copyright (c) 2014 Intel Corporation.
|
||
|
|
#
|
||
|
|
# Permission is hereby granted, free of charge, to any person obtaining
|
||
|
|
# a copy of this software and associated documentation files (the
|
||
|
|
# "Software"), to deal in the Software without restriction, including
|
||
|
|
# without limitation the rights to use, copy, modify, merge, publish,
|
||
|
|
# distribute, sublicense, and/or sell copies of the Software, and to
|
||
|
|
# permit persons to whom the Software is furnished to do so, subject to
|
||
|
|
# the following conditions:
|
||
|
|
#
|
||
|
|
# The above copyright notice and this permission notice shall be
|
||
|
|
# included in all copies or substantial portions of the Software.
|
||
|
|
#
|
||
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||
|
|
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||
|
|
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||
|
|
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
||
|
|
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
||
|
|
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||
|
|
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
|
||
|
|
|
||
|
|
import mraa as m
|
||
|
|
|
||
|
|
# this example will show the 'advanced' i2c functionality from python i2c
|
||
|
|
# read/write
|
||
|
|
|
||
|
|
x = m.I2c(0)
|
||
|
|
x.address(0x77)
|
||
|
|
|
||
|
|
# initialise device
|
||
|
|
if x.readReg(0xd0) != 0x55:
|
||
|
|
print("error")
|
||
|
|
|
||
|
|
# we want to read temperature so write 0x2e into control reg
|
||
|
|
x.writeReg(0xf4, 0x2e)
|
||
|
|
|
||
|
|
# read a 16bit reg, obviously it's uncalibrated so mostly a useless value :)
|
||
|
|
print(str(x.readWordReg(0xf6)))
|
||
|
|
|
||
|
|
# and we can do the same thing with the read()/write() calls if we wished
|
||
|
|
# thought I'd really not recommend it!
|
||
|
|
|
||
|
|
x.write(bytearray(b'0xf40x2e'))
|
||
|
|
|
||
|
|
x.writeByte(0xf6)
|
||
|
|
d = x.read(2)
|
||
|
|
|
||
|
|
# WARNING: python 3.2+ call
|
||
|
|
print(str(d))
|
||
|
|
print(int.from_bytes(d, byteorder='little'))
|