The Pi SoC has 54 GPIO signals.
Oh no, that was the one thing i had not yet solved, how to change state while openjoan wrote: ↑Fri May 11, 2018 8:26 pmI had high hopes of the new gpiochip based kernel interface. I hope I am not using it properly as they have been dashed. It feels like the kernel interface only expects people to read a button or switch a LED on or off. As far as I can see a GPIO can only be in one mode at any one time - INPUT, OUTPUT, or EVENT which are mutually exclusive. My personal benchmark was seeing if the kernel interface could reliably read a DHT11/DHT22. It can't, I can only get circa 90% reliability. I'm trying not to cheat, I set the GPIO to write to send the trigger, then have to close the GPIO and set it to EVENT. That transition takes a few more microseconds than I would hope.
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