I have a RPi 3 with slackware 14.2 installed. I would like to use the gpio in a general way. I have a pi zero with raspbian installed and use sysfs to control the pins. I'm not using i2c or pwm or anything like that, i want to read the value of a pin (high or low) in a bash script like i do on the pi zero. I want to avoid using python, and avoid using raspbian. thanks

Hi Brian-in-ohio, & welcome to LQ.

There must be scores or hundreds of ways of doing this. The RazPi is about the most numerous and well-eperimented-with sbc out there. I'm not sure what you mean 'I don't want to use raspbian.' The Pi need an OS, clearly.

That said, Raspbian will probably have some way of doing GPIO. General Purpose Input Output (GPIO) is handy on Micro-controllers (e.g. Micrpchip's Pics) but messy on computers. The pins have to be controlled individually. They are a few pins stuck on with an awkward interface, and I very much doubt if a script will talk to them. If I needed GPIO, I would be very glad of any help in raspbian.

I think you're looking for something like this:

https://www.ics.com/blog/gpio-progra...ysfs-interface

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Another option is http://wiringpi.com/

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I think my question wasn't clear enough. Is it possible to control gpio pins using the sys calls as outlined in the link above in SLACKWARE? WiringPi installs nicely, but its a library to compile against C-code not to be used in a bash script.

Check my link above. Its examples are given directly in Bash. And I have used code very similar, to turn an LED on and off, interactively, using Bash.

Addendum: in the article, the commands are presented as if for a non-root user. On my RPi, the directories and files require root privileges, so you have to log in as root (or "su -" from a non-root command line) to try them out.

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WiringPI contains gpio and gpio is an executable which can be used in a shell script.

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Thanks z80, wiringpi works great, just the functionality I was looking for and I don't have to use raspbian or python!

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