1#!/usr/bin/env python 2 3# Author: Brendan Le Foll <brendan.le.foll@intel.com> 4# Copyright (c) 2014 Intel Corporation. 5# 6# Permission is hereby granted, free of charge, to any person obtaining 7# a copy of this software and associated documentation files (the 8# "Software"), to deal in the Software without restriction, including 9# without limitation the rights to use, copy, modify, merge, publish, 10# distribute, sublicense, and/or sell copies of the Software, and to 11# permit persons to whom the Software is furnished to do so, subject to 12# the following conditions: 13# 14# The above copyright notice and this permission notice shall be 15# included in all copies or substantial portions of the Software. 16# 17# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 21# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 22# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 23# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE 24 25import mraa as m 26 27# this example will show the 'advanced' i2c functionality from python i2c 28# read/write 29 30x = m.I2c(0) 31x.address(0x77) 32 33# initialise device 34if x.readReg(0xd0) != 0x55: 35 print("error") 36 37# we want to read temperature so write 0x2e into control reg 38x.writeReg(0xf4, 0x2e) 39 40# read a 16bit reg, obviously it's uncalibrated so mostly a useless value :) 41print(str(x.readWordReg(0xf6))) 42 43# and we can do the same thing with the read()/write() calls if we wished 44# thought I'd really not recommend it! 45 46x.write(bytearray(b'0xf40x2e')) 47 48x.writeByte(0xf6) 49d = x.read(2) 50 51# WARNING: python 3.2+ call 52print(str(d)) 53print(int.from_bytes(d, byteorder='little')) 54