Would you like the ARM I2C interface to be enabled?: Yes
I2C関連のツール、ライブラリをインストールします。
sudo apt-get install i2c-tools python-smbus
sudo reboot
I2Cインターフェースが有効になっていることを確認します。
ls /dev/i2c*
「/dev/i2c-1」が表示されればOKです。
デバイスの接続を確認します。
i2cdetect -y 1
認識されたデバイスのアドレスが表示されます。（応答しないデバイスもあります。）
OLEDキャラクターディスプレイモジュールをpythonで制御してみます。
i2c_hello.py
#!/usr/bin/python # -*- coding: utf-8 -*-
#Copyright (c) 2017, miya #All rights reserved. # #Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: # #1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. # #2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. # #THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. #IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, #PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import smbus
import time
def str2ascii(string):
out = []
for char in string:
out.append(ord(char))
return out
def i2c_out(i2c_if, addr, reg, data, wait):
for value in data:
i2c_if.write_byte_data(addr, reg, value)
time.sleep(wait)
