使用connectionPi2-python(非根)分段故障捕获的GPIO [英] using wiringPi2-python (non root) segmentation fault catching for GPIO

问题描述

我正在使用connectionPi2-python将树莓GPIO引脚从低切换到高，然后再切换回. 切换引脚的值后，一切都可以正常进行，而Segmentation fault会被抛出并且程序停止.
我需要使用这种方法，因为这似乎是不使用sudo

i'm using wiringPi2-python to switch a raspberry GPIO pin from low to high and back. Everything works BUT right after it switches the pin's value a Segmentation fault is thrown and the program stops.
I need to use this approach because this seems to be the only way to access the GPIO pins without sudo

在启动程序之前，我需要设置引脚以进行输出和输出，这样:

before starting the program i need to setup the pins to output and export them so:

$ echo 17 > /sys/class/gpio/export
$ echo out > /sys/class/gpio/gpio17/direction

然后是一些python shell:

and then a bit of python shell:

$ python
Python 2.7.3 (default, Jan 13 2013, 11:20:46) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import wiringpi2 as pi
>>> pi.wiringPiSetupSys()
0
>>> pi.digitalWrite(17, 1)
Segmentation fault
$

我尝试了这种方法，但是并没有更好.程序仍然停止.:

i tried this approach, but it wasn't any better. The program still stopped.:

try:
        pi.digitalWrite(17, 0)
except:
        print('got an error')
print('just printing something to see if gets to end')

所以我的问题是如何正确捕获错误，所以我可以忽略它，因为代码可以正常工作.
附言:这可能值得一个错误报告，但我想先解决这个问题.

So my question is how can i catch the error properly, so i could just ignore it because the code actually works.
Ps: This is propably worth a bug report but i want to get my head around it first.

推荐答案

所以我想通了.我需要为digitalwrite做另一个处理.在这种情况下，新创建的进程将停止，但程序的其余部分可以继续工作.

so i figured it out. i need to make another process for digitalwrite. In that case the newly created process stops but the rest of the program can continue working.

import wiringpi2 as pi
from multiprocessing import Process

def process(choice):
        if choice == "1":
                pi.digitalWrite(17, 1)
        else:
                pi.digitalWrite(17, 0)

if __name__ == '__main__':
        pi.wiringPiSetupSys()
        choice = raw_input(">")
        p = Process(target=process, args=(choice,))
        p.start()
        p.join()

print('just printing something to see if gets to end')

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