Raspberry Pi 5 - Toggling GPIOs disables I2C addresses. python toggle_line_value.py example :

[nickFridays]

Hello,
Raspberry Pi 5 - Toggling GPIOs with gpiod disables I2C addresses

pi@pi:~ $ pinout
Description : Raspberry Pi 5B rev 1.0
Revision : d04170
SoC : BCM2712
RAM : 8GB
Storage : MicroSD
USB ports : 4 (of which 2 USB3)
Ethernet ports : 1 (1000Mbps max. speed)

pi@pi:~ $ uname -a
Linux pi 6.6.62+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.6.62-1+rpt1 (2024-11-25) aarch64 GNU/Linux

pi@pi:~ $ gpiodetect
gpiochip0 [pinctrl-rp1] (54 lines)
gpiochip10 [gpio-brcmstb@107d508500] (32 lines)
gpiochip11 [gpio-brcmstb@107d508520] (4 lines)
gpiochip12 [gpio-brcmstb@107d517c00] (17 lines)
gpiochip13 [gpio-brcmstb@107d517c20] (6 lines)
gpiochip0 [pinctrl-rp1] (54 lines)

pi@pi:~ $ ls /dev/i2*
/dev/i2c-1 /dev/i2c-13 /dev/i2c-14
pi@pi:~ $ sudo raspi-config nonint get_i2c
0

[brgl]

I'm pretty sure this is not a problem with libgpiod but a question that should be asked to the raspberry pi community? You're not saying which pin you're toggling, I would assume it either resets the i2c device or serves as some kind of GPIO mux? I don't know RPi 5 and don't have one.

[nickFridays]

I also hope it is not a problem with libgpiod because it is practically the only lib working with Pi 5, thanks to you.

[brgl]

I don't know what BCM GPIO is. I don't work with Raspberry Pi. The example code is meant to be generic and show how to use the library. I cannot know which pin you actually want to toggle and what its function is.

[nickFridays]

Ok

[brgl]

It's just an example. It will be pin 5 of chip whatever chip is represented on your system by the /dev/gpiochip0 character device. You need to adjust the code for your needs. From the output of gpiodetect I'd say it will be pin 5 of gpiochip0 [pinctrl-rp1] (54 lines) but you will really have more luck talking to the people who know this platform well.

[nickFridays]

Ok, thanks anyways for you quick response.

Resolved : Raspberry Pi -5 hardware issue. gpiod lib works fine with Raspberry Pi 4.