How to use I2C on the nRF5340 DK ?

[GunnerDx]

Greetings,

I am trying to develop an application on the nRF5340 DK that requires me to collect data from a sensor using I2C and I am confused on how to do that. I have seen people talking about TWI and others saying that you don't need TWI. On STM32 it was very simple to add, initilialize and use I2C. I hope it is the same for the nRF boards. Can someone please help me out with an example code for the nRF5340 DK ?

Thank you.

[Simon]

TWI is the same as I2C, but there are legal reasons for not using that name.

You could start with the I2C  scanner sample, created by a colleague of mine. It should work with the nRF5340

Check out the answer below, where I explained how to use a peripheral, like I2C:

https://devzone.nordicsemi.com/support-private/support/263222#permalink=629762

If you don't get the provided sample to work, or are still confused, please let me know

Best regards,

Simon

[GunnerDx]

Thank you. In the I2C scanner example you provided I can see that the device_get_binding works well for the I2C which is something I was struggling with. However, I would like to be able to change the pins of the SCL and SDA signals. Do you have an idea on how to achieve that ?

Thank you in advance.

[Simon]

You configure the hardware through the overlay file.

If you're using the secure board, modify nrf5340dk_nrf5340_cpuapp.overlay

If yo're using the nonsecure board, modify nrf5340dk_nrf5340_cpuappns.overlay (it should be nrf5340dk_nrf5340_cpuapp_ns.overlay in NCS v1.7.0, but I think it will get renamed automatically).

I can see that you got a different advice in the ticket nRF5340 I2C pins, but that is the approach for the nRF5 SDK (and in NCS if you're using the NRFX drivers directly). The nRF5340 is only compatible with the nRF Connect SDK (NCS), which is the one you're using now.

Configuring hardware in NCS is always done through the device tree (.overlay, .dts, .dtsi.. files). Read more about the Device Tree here: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/dts/index.html 

Best regards,

Simon

[GunnerDx]

Thank you so much for explaining everything

[Simon]

I'm happy to help