How to get die temperature on NRF52832 using Zephyr

[Christian Holland]

I'm trying to get a temperature reading from the on-chip temperature sensor on the NRF52832 - I know it is not a very accurate sensor but I still want to use it. I found a very cohesive example of how to do this using the nRF SDK:

nRF5_SDK_15.0.0_a53641a/examples/peripheral/temperature

But I'd now like to implement this in Zephyr - has anyone got any examples of this working? I guess it'd be as simple as referencing the nrf_temp.h library that the example uses in order to get the necessary functions?

Any pointers would be greatly appreciated

Thanks

[David]

According to Zephyr documentation, the default value for CONFIG_TEMP_NRF5_NAME should be "TEMP_0", but that doesn't work for me. Could you check how it's expanded in your example?

Which chip / board do you use? I have an nRF52840-DK

What are the contents of your prj.conf file? Do I have to enable something more than CONFIG_SENSOR=y

[Christian Holland]

We've only been testing and using NRF52832 so i guess the binding could be different for the 528340 (although i wouldn't imagine so).

Try adding this to you prj.conf

CONFIG_TEMP_NRF5=y

[David]

Thank you for the hint. Unfortunately, CONFIG_TEMP_NRF5_NAME is still undefined.

However, CONFIG_HAS_HW_NRF_TEMP is set to 1, which means the hardware exists, but I can't figure out its name.

[Christian Holland]

Are you sure to include the sensor header file too?

#include <drivers/sensor.h>

If not I'm not sure what else, there's nothing else relevant in my prj.conf. Are you in the Zephyr Slack channel? They're normally quite helpful there.

[David]

Yes, the header file is included. I'll see if I can get some help on Slack

Thanks for your help