Multiple devices with the same address on two different I2C buses

RE: Multiple devices with the same address on two different I2C buses

Freldic_SK — Sun, 23 Mar 2025 18:03:41 GMT

Hello, it took me a while to figure out why I couldn't activate the second I2C bus. The solution for me was to go to the 1-Wire scanner sample and declare it there. I don't know why it didn't work anywhere else for i2c1 and only here. Anyway, I didn't encounter the problem anywhere else.

RE: Multiple devices with the same address on two different I2C buses

Jared — Mon, 24 Feb 2025 14:16:45 GMT

Hi,

I see that you're not using pin-ctrl, can you try adding this and see if that fix the problem? As a reference I've added a sample that enable two I2Cs, it's based on lesson 6 on the Devacademy NCS course.

I've built it for v2.8.0, but I think it should build fine with v2.9.0 as well..

regards

Jared

devzone.nordicsemi.com/.../l6_5F00_e1_5F00_sol.zip

RE: Multiple devices with the same address on two different I2C buses

Freldic_SK — Fri, 21 Feb 2025 20:27:50 GMT

My problem is that I can't compile the program I want to upload. because zephyr does not recognize alias i2c1.

The weird thing is that only Zephyr takes alias i2c0.

RE: Multiple devices with the same address on two different I2C buses

Freldic_SK — Fri, 21 Feb 2025 20:25:32 GMT

devzone.nordicsemi.com/.../my_5F00_i2c.zip

Here it is :)

RE: Multiple devices with the same address on two different I2C buses

Turbo J — Fri, 21 Feb 2025 14:39:23 GMT

REMOVE the CONFIG_NRFX_TWIM and CONFIG_I2C_NRFX_TWIM lines from the prj.conf, this stuff is pulled indirectly via DTS.

No idea why i2c1 won't work - you may want to use an ocilloscope/ logic analyser. Probably also a good idea to check the pin configs with a debugger.

RE: Multiple devices with the same address on two different I2C buses

Jared — Fri, 21 Feb 2025 14:20:48 GMT

Hi,

Could you share your project? I want to try to reproduce this,

regards

Jared

RE: Multiple devices with the same address on two different I2C buses

Freldic_SK — Fri, 21 Feb 2025 10:13:42 GMT

Hi,
I use nrf52840dk_nrf52840

RE: Multiple devices with the same address on two different I2C buses

Jared — Fri, 21 Feb 2025 10:10:08 GMT

Hi,

Which board file are you building for?

regards

Jared