GPIO callback crashes when I2C function runs

RE: GPIO callback crashes when I2C function runs

frax84 — Thu, 25 May 2023 15:03:46 GMT

Got it! Thank you!

RE: GPIO callback crashes when I2C function runs

Einarh — Thu, 25 May 2023 11:34:33 GMT

The rule of thumb is to not put blocking function calls (synchronous API routines) in callback handlers.

I'm surprised your code didn't crash at i2c_write_read_dt, but it might just block for a short enough time to not be an issue.

-Einar

RE: GPIO callback crashes when I2C function runs

frax84 — Wed, 24 May 2023 08:33:39 GMT

Hello Einar,

thank you for your feedback. I supposed that this could be the issue, but i wanted to understand if there could be something i was missing. The reference on the semaphore is very interesting. Thank you.

RE: GPIO callback crashes when I2C function runs

Einarh — Tue, 23 May 2023 12:19:46 GMT

Hello

I would advise against running things like i2c write/read in callback handlers as you're likely to run into this sort of issue.

Instead I would suggest signaling from the callback handler with a semaphore and execute your code in main (or its own thread).

Best regards,

Einar