ubuntu和raspberry下调试python_spi备忘

Ubuntu12.04 自安装python3.3中头文件Python.h路径：usr/local/python3.3/include/python3.3m

Ubuntu12.04 自带的Python2.7中头文件Python.h路径：usr/                      include/python2.7

Ubuntu12.04 自安装python3.3解释器Python路径：usr/local/python3.3/bin

Ubuntu12.04 自带的Python2.7解释器Python路径：usr/                      bin

但默认解释器是python2.7，所以无论在哪个目录下输入python都是python2.7（可能是在安装python3.3时建立了连接关系）

现在将python2.7备份：sudo cp /usr/bin/python ./pythonback

删除原python：sudo rm usr/bin/python

建立新连接 sudo ln -s /usr/local/python3.3/bin/python3.3 /usr/bin/python

之后输入python默认的就是python3.3解释器了，如果想使用python2.7可以在/usr/bin目录下使用pythonback

如果不想更改默认连接，则可以在/usr/local/python3.3/bin目录下使用python3.3

在ubuntu12.04上： 

spi源文件名：spi.c   测试文件名：spi_test.py

编译2.7版spi.c：

gcc -fpic -c -I/usr/local/python3.3/include/python3.3m spi.c =>spi.o（用Python3.3的头文件python.h）

gcc -shared -o spi.so spi.o =>spi.so（产生共享库spi.so文件）

python spi_test.py

编译3.3版spi.c

gcc -fpic -c -I/usr/include/python2.7 spi.c

gcc -shared -o spi.so spi.o

pythonback spi_test.py

在raspberry上：

nano使用：

sudo nano /etc/hosts

完成后按ctrl+x退出，按y保存，回车，OK

raspberry找不到spidev0.0和spidev0.1的解决办法：

修改系统配置

1. $ sudo nano /etc/modprobe.d/raspi-blacklist.conf

都注释掉，修改为:

1. # blacklist spi and i2c by default (many users don't need them)
3. #blacklist spi-bcm2708
4. #blacklist i2c-bcm2708

修改加载模块

1. $ sudo nano /etc/modules

改为:

1. snd-bcm2835
2. i2c-dev
3. spidev

主要是增加 spidev
重启之后，/dev/中会多出两个设备 spidev0.0 与 spidev0.1， 没有出现的话请google排错。

具体参见：http://www.shumeipai.net/forum.php?mod=viewthread&action=printable&tid=19410

编译python2.7代码：

raspberry的python.h路径：/usr/include/python2.7

raspberry的python2.7解释器路径：/usr/bin    python2.7

pi@raspberrypi:~/Documents/python_spi/python_spi_2$ gcc -fpic -c -I/usr/include/python2.7 spi.c
pi@raspberrypi:~/Documents/python_spi/python_spi_2$ gcc -shared -o spi.so -I/usr/include/python2.7 spi.o
pi@raspberrypi:~/Documents/python_spi/python_spi_2$ python spi_test.py

#raspberry的python3.2解释器路径：

#pi@raspberrypi:/usr/bin$ python3.2mu

 #Python.h文件路径：/usr/lib/pypy-upstream/include/

python3.3的python.h文件路径：/usr/local/Python-3.3..2/include/python3.3m/

python3.3解释器python3.3文件路径：/usr/local/Python-3.3..2/bin

将/usr/local/Python-3.3..2/bin添加到PATH路径后，在该路径下即可使用python3.3解释器

pi@raspberrypi:/usr/local/Python-3.3..2/bin$ python3.3

编译：

pi@raspberrypi:~/Documents/python_spi/python_spi_3$ gcc -fpic -c -I/usr/local/Python-3.3..2/include/python3.3m spi.c

pi@raspberrypi:~/Documents/python_spi/python_spi_3$ gcc -shared -o spi.so -I/usr/local/Python-3.3..2/include/python3.3m spi.o

pi@raspberrypi:~/Documents/python_spi/python_spi_3$ /usr/local/Python-3.3..2/bin/python3.3 spi_test.py