Configuring two sensor on same i2c bus in Zephyr RTOS

RE: Configuring two sensor on same i2c bus in Zephyr RTOS

Susheel Nuguru — Fri, 28 Jul 2023 10:19:02 GMT

I do not see the author dropped their code here, so it seems this thread ended up incomplete.

RE: Configuring two sensor on same i2c bus in Zephyr RTOS

swood — Thu, 27 Jul 2023 20:34:17 GMT

Can you drop your code for this as an example? I'm trying to do the same thing.

RE: Configuring two sensor on same i2c bus in Zephyr RTOS

AviveScott — Tue, 23 Aug 2022 16:59:46 GMT

Have this been answered yet? I am using an NRF5340 with SDK 2.0.0. I am trying to tie 2 I2C ports to a single instantiation of i2c2 and would appreciate a sample implementation.

RE: Configuring two sensor on same i2c bus in Zephyr RTOS

Bruno Saraiva — Thu, 22 Apr 2021 14:18:32 GMT

Were you able to get this solved?
I find it surprising that any "I2C for dummies" document out there will show that one of the main features of an I2C bus is the possibility of using multiple devices in the same lines, simply using different addresses. And yet, this basic concept is not covered by any of the examples, and I see many posters having trouble to get things working properly sharing an I2C bus with more than one device using Zephyr. Particularly for the nRF5x chips, which are quite limited in I2C communication ports, this feature should be the second example in the book of their I2C sample codes!

RE: Configuring two sensor on same i2c bus in Zephyr RTOS

Susheel Nuguru — Thu, 25 Feb 2021 09:17:45 GMT

You need to have different gpio pins for SCL for driving two instances differently. You cannot drive the two instances using same SCL, else both will try to own the SDA pin at the same time.

Can you show me some code snippets on how you initialized your twi code.

RE: Configuring two sensor on same i2c bus in Zephyr RTOS

new — Thu, 25 Feb 2021 07:30:49 GMT

I am able to get the data from two sensor, by configuring it in a different lines i2c0 and i2c1, then configure the devices separately. Thank you.

RE: Configuring two sensor on same i2c bus in Zephyr RTOS

Susheel Nuguru — Thu, 25 Feb 2021 07:15:15 GMT

I do not think we have an example of using two instances of I2C in one example. Have you started to debug and see which part of the transaction gets stuck in the driver? Can you see that the initialization of the two instances went through without any errors?

RE: Configuring two sensor on same i2c bus in Zephyr RTOS

new — Sun, 21 Feb 2021 12:55:54 GMT

I have tried all different combinations of zephyr configuration to define two instances of i2c for two sensors, but unable to get data from both. Is there any example or guide to get two instances of twi with zephyr over nrf52840? Suggestions would be really helpful.