1 #!/usr/bin/env python 2 3 # Author: Brendan Le Foll <brendan.le.foll (at] 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 25 import mraa as m 26 27 # this example will show the 'advanced' i2c functionality from python i2c 28 # read/write 29 30 x = m.I2c(0) 31 x.address(0x77) 32 33 # initialise device 34 if x.readReg(0xd0) != 0x55: 35 print("error") 36 37 # we want to read temperature so write 0x2e into control reg 38 x.writeReg(0xf4, 0x2e) 39 40 # read a 16bit reg, obviously it's uncalibrated so mostly a useless value :) 41 print(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 46 x.write(bytearray(b'0xf40x2e')) 47 48 x.writeByte(0xf6) 49 d = x.read(2) 50 51 # WARNING: python 3.2+ call 52 print(str(d)) 53 print(int.from_bytes(d, byteorder='little')) 54
