阅读目录(Content)
Qemu: 2.8.0
开发板：vexpress-ca9
前面的博文已经使我们的虚拟开发板具备了访问外网的目的，离物联网越来越近了。要玩物联网，Yeelink不得不说，它提供了云平台，可以将设备的数据上传到云端，然后可以通过手机客户端或在网页端查看或修改，从而达到用手机客户端跟嵌入式设备通信的目的。
下面我们实现一个非常简单的功能： 添加一个虚拟开关，通过Yeelink的手机客户端或在网页端可以查看和修改这个开端的状态，而我们的板子会每隔2s联网读取一次这个虚拟开关的状态，最后板子根据开关的状态打印不同的提示。
一、首先登陆Yeelink官网，手动添加一个device，然后在该device下面再创建一个sensor用来代表虚拟开关。
二、为Python添加requests模块
Requests 是用Python语言编写，基于urllib，采用Apache2 Licensed开源协议的HTTP库。它比urllib更加方便，可以节约我们大量的工作，完全满足HTTP测试需求。
1、下载requests模块
下载地址： https://pypi.python.org/pypi/requests/2.3.0 或 requests-2.3.0.tar.gz
解压后：
$lsHISTORY.rst NOTICE requests/ setup.cfg LICENSE PKG-INFO requests.egg-info/ setup.py* MANIFEST.in README.rst requirements.txt test_requests.py*
其中的requests既可以用于Python2也可以用于Python3，然后将这个requests目录拷贝到对应Python的site-packages下面。
在导入requests模块的时候，会提示找不到zlib模块。
2、重新编译Python，支持zlib
下载zlib： http://www.zlib.net/zlib-1.2.11.tar.gz 或 zlib-1.2.11.tar.gz
编译zlib：
1 #!/bin/bash2 3 export CC=arm-none-linux-gnueabi-gcc4 5 ../zlib-1.2.11/configure \6 --prefix=`pwd`
修改Makefile，修改AR和RANLIB如下：
AR=arm-none-linux-gnueabi-arRANLIB=arm-none-linux-gnueabi-ranlib
然后执行make && make install， 安装完成之后不要忘了把lib下的so和include下的头文件拷贝到板子上。
编译Python3：
1 #!/bin/bash 2 3 ../Python-3.6.0/configure \ 4 --host=arm-none-linux-gnueabi \ 5 --build=armv7 \ 6 --prefix=`pwd` \ 7 --enable-ipv6 \ 8 --enable-shared \ 9 ac_cv_file__dev_ptmx="yes" \10 ac_cv_file__dev_ptc="no" \11 LDFLAGS="-L/home/pengdonglin/disk_ext/Third_Part/SQlite3/aarch32/lib \12 -L/home/pengdonglin/disk_ext/Third_Part/Readline/aarch32/lib \13 -L/home/pengdonglin/disk_ext/Third_Part/Termcap/aarch32/lib \14 -L/home/pengdonglin/disk_ext/Third_Part/Zlib/aarch32/lib"\15 CPPFLAGS="-I/home/pengdonglin/disk_ext/Third_Part/SQlite3/aarch32/include \16 -I/home/pengdonglin/disk_ext/Third_Part/Readline/aarch32/include \17 -I/home/pengdonglin/disk_ext/Third_Part/Termcap/aarch32/include \18 -I/home/pengdonglin/disk_ext/Third_Part/Zlib/aarch32/include"\19 LDLAST="-L/home/pengdonglin/disk_ext/Third_Part/Readline/aarch32/lib \20 -L/home/pengdonglin/disk_ext/Third_Part/Termcap/aarch32/lib \21 -L/home/pengdonglin/disk_ext/Third_Part/Zlib/aarch32/lib"22 23 make -j424 make install
安装完成后，也可以直接将lib/python3.6/lib-dynload/zlib.cpython-36m-arm-linux-gnueabi.so拷贝到板子上面的/usr/lib/python3.6/lib-dynload/下面即可， 而不必全部更新
编译Python2：
mk1_conf.sh:
1 #!/bin/bash 2 3 ../Python-2.7.13/configure --prefix=`pwd` \ 4 --host=arm-none-linux-gnueabi \ 5 --build=x86_64-linux-gnu \ 6 --enable-ipv6 \ 7 --enable-shared \ 8 ac_cv_file__dev_ptmx="yes" \ 9 ac_cv_file__dev_ptc="no" \10 LDFLAGS="-L/home/pengdonglin/disk_ext/Third_Part/SQlite3/aarch32/lib \11 -L/home/pengdonglin/disk_ext/Third_Part/Readline/aarch32/lib \12 -L/home/pengdonglin/disk_ext/Third_Part/Termcap/aarch32/lib \13 -L/home/pengdonglin/disk_ext/Third_Part/Zlib/aarch32/lib"\14 CPPFLAGS="-I/home/pengdonglin/disk_ext/Third_Part/SQlite3/aarch32/include \15 -I/home/pengdonglin/disk_ext/Third_Part/Readline/aarch32/include \16 -I/home/pengdonglin/disk_ext/Third_Part/Termcap/aarch32/include \17 -I/home/pengdonglin/disk_ext/Third_Part/Zlib/aarch32/include"\18 LDLAST="-L/home/pengdonglin/disk_ext/Third_Part/Readline/aarch32/lib \19 -L/home/pengdonglin/disk_ext/Third_Part/Termcap/aarch32/lib \20 -L/home/pengdonglin/disk_ext/Third_Part/Zlib/aarch32/lib"\
mk2_make.sh:
1 #!/bin/bash 2 3 make HOSTPYTHON=../x86_64/python \ 4 HOSTPGEN=../x86_64/Parser/pgen \ 5 BLDSHARED="arm-none-linux-gnueabi-gcc -shared" \ 6 CROSS_COMPILE=arm-none-linux-gnueabi- \ 7 CROSS_COMPILE_TARGET=yes \ 8 HOSTARCH=arm-none-linux-gnueabi \ 9 BUILDARCH=x86_64-linux-gnu \10 -j4
mk3_install.sh:
1 #!/bin/bash2 3 make install HOSTPYTHON=../x86_64/python \4 BLDSHARED="arm-none-linux-gnueabi-gcc -shared" \5 CROSS_COMPILE=arm-none-linux-gnueabi- \6 CROSS_COMPILE_TARGET=yes \7 prefix=`pwd`
安装完成后，也可以直接将lib/python2.7/lib-dynload/zlib.so拷贝到开发板的/usr/lib/python2.7/lib-dynload/下面，而不用全部更新
然后修改mk_ramdisk.sh:
1 #!/bin/bash 2 3 thiry_part=/home/pengdonglin/disk_ext/Third_Part/ 4 cross_compile=/home/pengdonglin/disk_ext/Cross_Compiler/aarch32/ 5 6 sudo rm -rf rootfs 7 sudo rm -rf tmpfs 8 sudo rm -rf ramdisk* 9 sudo losetup -d /dev/loop010 sudo losetup /dev/loop0 ./fs_vexpress_1G.img11 sudo partprobe /dev/loop012 13 sudo mkdir rootfs14 sudo cp ${thiry_part}/Busybox/aarch32/_install/* rootfs/ -raf15 16 sudo mkdir -p rootfs/proc/17 sudo mkdir -p rootfs/sys/18 sudo mkdir -p rootfs/tmp/19 sudo mkdir -p rootfs/root/20 sudo mkdir -p rootfs/var/21 sudo mkdir -p rootfs/mnt/22 23 sudo cp etc rootfs/ -arf24 25 sudo cp -arf ${cross_compile}/arm-2014.05/arm-none-linux-gnueabi/libc/lib rootfs/26 27 #Python328 sudo mkdir -p rootfs/usr29 pushd rootfs/usr30 sudo cp -raf /home/pengdonglin/disk_ext/Python/Python3/aarch32/bin .31 sudo cp -raf /home/pengdonglin/disk_ext/Python/Python3/aarch32/lib .32 sudo cp -raf /home/pengdonglin/disk_ext/Python/Python3/aarch32/include .33 sudo cp -raf /home/pengdonglin/disk_ext/Python/Python3/aarch32/share .34 35 #Python236 sudo cp -raf /home/pengdonglin/disk_ext/Python/Python2/aarch32/bin .37 sudo cp -raf /home/pengdonglin/disk_ext/Python/Python2/aarch32/lib .38 sudo cp -raf /home/pengdonglin/disk_ext/Python/Python2/aarch32/include .39 sudo cp -raf /home/pengdonglin/disk_ext/Python/Python2/aarch32/share .40 popd41 42 #SQlite343 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/SQlite3/aarch32/bin/* rootfs/bin/44 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/SQlite3/aarch32/include/* rootfs/include/45 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/SQlite3/aarch32/lib/* rootfs/lib/46 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/SQlite3/aarch32/share/* rootfs/usr/share47 48 #Readline49 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/Readline/aarch32/include/ rootfs/include/50 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/Readline/aarch32/lib/* rootfs/lib/51 52 #Zlib53 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/Zlib/aarch32/include/* rootfs/include/54 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/Zlib/aarch32/lib/* rootfs/lib/55 56 #BeautifulSoup457 sudo cp -raf /home/pengdonglin/disk_ext/Python/BeautifulSoup4/beautifulsoup4-4.5.3/bs4 rootfs/usr/lib/python2.7/site-packages58 sudo cp -raf /home/pengdonglin/disk_ext/Python/BeautifulSoup4/beautifulsoup4-4.5.3/py3k/bs4 rootfs/usr/lib/python3.6/site-packages59 60 #Requests61 sudo cp -raf /home/pengdonglin/disk_ext/Python/Requests/requests-2.3.0/requests rootfs/usr/lib/python2.7/site-packages62 sudo cp -raf /home/pengdonglin/disk_ext/Python/Requests/requests-2.3.0/requests rootfs/usr/lib/python3.6/site-packages63 64 #Boa65 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/WebServer/Boa/boa-0.94.13/src/boa rootfs/bin66 sudo mkdir -p rootfs/usr/lib/boa67 sudo cp -raf /home/pengdonglin/disk_ext/Third_Part/WebServer/Boa/boa-0.94.13/src/boa_indexer rootfs/usr/lib/boa68 sudo mkdir -p rootfs/var/www/cgi-bin69 sudo mkdir -p rootfs/var/log/boa70 71 sudo rm -rf rootfs/lib/*.a72 sudo arm-none-linux-gnueabi-strip rootfs/lib/* rootfs/bin/*73 sudo arm-none-linux-gnueabi-strip rootfs/usr/lib/boa/*74 sudo arm-none-linux-gnueabi-strip rootfs/usr/lib/*75 sudo arm-none-linux-gnueabi-strip rootfs/usr/bin/*76 sudo arm-none-linux-gnueabi-strip rootfs/bin/*77 78 sudo mkdir -p rootfs/dev/79 sudo mknod rootfs/dev/tty1 c 4 180 sudo mknod rootfs/dev/tty2 c 4 281 sudo mknod rootfs/dev/tty3 c 4 382 sudo mknod rootfs/dev/tty4 c 4 483 sudo mknod rootfs/dev/console c 5 184 sudo mknod rootfs/dev/null c 1 385 86 sudo mkdir ./tmpfs/87 sudo mount -t ext4 /dev/loop0p1 ./tmpfs/88 sudo rm -rf ./tmpfs/*89 sudo cp -raf rootfs/* ./tmpfs/90 91 sleep 292 sudo umount ./tmpfs/93 94 sudo losetup -d /dev/loop0
3、测试
1 [root@vexpress ]# python3 2 Python 3.6.0 (default, May 6 2017, 00:08:14) 3 [GCC 4.8.3 20140320 (prerelease)] on linux 4 Type "help", "copyright", "credits" or "license" for more information. 5 >>> import requests 6 >>> 7 [root@vexpress ]# python2 8 Python 2.7.13 (default, May 6 2017, 00:11:41) 9 [GCC 4.8.3 20140320 (prerelease)] on linux210 Type "help", "copyright", "credits" or "license" for more information.11 >>> import requests12 >>>
三、编写python程序获取开关状态
get_switch.py2:
1 #!/usr/bin/env python2 2 3 import requests 4 import time 5 6 apiurl = "http://api.yeelink.net/v1.0/device/7445/sensor/405914/datapoints" 7 apiheaders = {‘U-ApiKey‘:‘3957bd54eaddd2fda1f35841d52776d9‘} 8 9 while True:10 r = requests.get(apiurl, headers=apiheaders)11 print(r.text)12 sw = r.json()13 if sw[‘value‘] == 1:14 print("Switch On")15 elif sw[‘value‘] == 0:16 print("Switch Off")17 time.sleep(2)
get_switch.py3:
1 #!/usr/bin/env python3 2 3 import requests 4 import time 5 6 apiurl = "http://api.yeelink.net/v1.0/device/7445/sensor/405914/datapoints" 7 apiheaders = {‘U-ApiKey‘:‘3957bd54eaddd2fda1f35841d52776d9‘} 8 9 while True:10 r = requests.get(apiurl, headers=apiheaders)11 print(r.text)12 sw = r.json()13 if sw[‘value‘] == 1:14 print("Switch On")15 elif sw[‘value‘] == 0:16 print("Switch Off")17 time.sleep(2)
四、测试
运行测试程序，然后在手机客户端或在网页端修改开关的状态，测试程序会联网获得开关的状态：
完。
原文地址：http://12883930.blog.51cto.com/12873930/1922699
