Simulate gpios for libgpiod

Question

I have an existing C++ code that reads periodically from /sys/class/gpio. Since this is depreciated, I want to change it and use libgpiod.

I have got component tests that run independently from the actual hardware. It runs on my dev machine that does not have those gpios. My code reads an environment variable with a different path, then uses the files there instead of /sys/class/gpio. I created simple text files there. I can now change these files to manipulate what my code reads and test its behaviour.

Is there a similar possibility for libgpiod?

Does this answer your question? [How to setup virtual Gpio loopback](https://stackoverflow.com/questions/66424148/how-to-setup-virtual-gpio-loopback) — 0andriy, Dec 23 '21 at 08:15

score 2 · Answer 1 · answered Dec 21 '21 at 19:40

2

There's a GPIO testing driver called gpio-mockup you can load. It creates mock GPIO devices. You need to enable it in your kernel or load it as a module.

answered Dec 21 '21 at 19:40

micke

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This looks good. Will accept this as an answer once I tested it next year. – kuga Dec 22 '21 at 10:43
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Mockup is obsoleted, one should use `GPIO-sim` module starting from v5.17-rc1. – 0andriy Dec 23 '21 at 08:13

Simulate gpios for libgpiod

1 Answers1