Raspberry Pi 5 - Toggling GPIOs with gpiod disables I2C addresses

[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

[6by9]

Duplicates https://forums.raspberrypi.com/viewtopic.php?p=2283565

[pelwell]

1. What hardware is attached (and how)?
2. Does this only happen when toggling GPIO 5?
3. You should use gpiochip0 now - gpiochip4 is supported for backwards compatibility.

[nickFridays]

@pelwell thank you for your quick response.

1. 3 SPI devices , 4 I2C devices. All 3 SPI devices communicate with Pi-5 and work fine. When GPIOs are not toggled , all SPI and 4 I2C devices communicate and work fine. Disconnecting one or two I2C dev. doesn't help.
2. The issue manifests itself with various GPIOs
3. I did try both chip0 and chip4 . I am not sure, It looks like it doesn't matter with the latest kernel.

[pelwell]

That's a lot of hardware for one Pi 5:
4. Which power supply are you using?
5. Is that the only source of power in the system?
6. What does dmesg -l err,warn report?
7. What's in your config.txt?

[nickFridays]

4. Each device is just a about 20 mAmps. 6Amp PSU no warning messages from Pi.
5. I did try a 5V power booster with no effect.
7. config.txt is a default with one line added for CAN bus.

[pelwell]

config.txt is a default with one line added for CAN bus.

i2c-1 should be disabled then.

[nickFridays]

Pi - 4 works fine with the same setup when using RPi.GPIO lib. (it needs to doublecheck)

[nickFridays]

config.txt is a default with one line added for CAN bus.

i2c-1 should be disabled then.

Is that an assumption or a statement ? Could you please point to any doc ? Thanks

[pelwell]

It's a statement. By default, the I2C interfaces are disabled. Unless you have a HAT with an EEPROM which causes an overlay to be loaded, it necessary to add something to config.txt that enables i2c-1 - either dtparam=i2c_arm or some overlay that also enables I2C. Which overlay are you loading for the CAN bus?

[nickFridays]

dtparam=i2c_arm=on

dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=6
dtoverlay=pwm,pin=13,func=4

[pelwell]

So not exactly

config.txt is a default with one line added for CAN bus

[nickFridays]

my bad.

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