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I have some experience with the python GPIO library and am working on porting some of my code to C for better performance. Normally, at the end of programs, or when I break out of them with Ctrl-C, I have my code set up with a try except so that GPIO.cleanup() is called and my motors don't just keep on doing what they were doing when I broke out.

However, I see no equivalent of GPIO.cleanup() in wiringPi. Is there one, or do I not need to bother with this in wiringPi?

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2 Answers 2

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As far as I am aware the only Python modules which have a cleanup function are RPi.GPIO and RPIO.GPIO. The others expect you to tidy up when you terminate.

None of the C libraries that I am aware off have an equivalent. If you want to change the mode or level of a GPIO when your program terminates you have to explicitly do so yourself.

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  • I tried this, but some of the pins I am using are the SPI pins. They are at the mode ALT0 by nature, and when I try a setMode(pin, ALT0) I get an error. Is there a way to set them back to the ALT0 state?
    – dpdt
    Commented Mar 28, 2016 at 19:00
  • I don't know for wiringPi. I'm afraid you'll need to check the documentation or look at the source code. My pigpio is quite happy setting a GPIO to an ALT mode. I.e. abyz.co.uk/rpi/pigpio/cif.html#gpioSetMode (click on the mode parameter). I think the bcm2835 C library also has a mode set command.
    – joan
    Commented Mar 28, 2016 at 19:12
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You should write your own "cleanup" code. I don't know what kind of circuit / motors you are using, so I can only assume here.

If your motors are not running when the pi boots up, before your program runs, I would explicitly change the mode of all GPIO pins you touched back to inputs. This will turn off your motors.

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