Using LPCOMP with nRF Connect SDK (Zephyr)

[FrancoisG]

I'm trying to use the LPCOMP to wake up from system OFF in Zephyr.

I can see the device tree "comp" node definition in nrf52840.dtsi but that is about it.

1. How can I define the AIN input to the comp node in the device tree?

2. How to I setup the reference voltage and the hysteresis?

[Kazi Afroza Sultana]

Hello,

There is no zephyr driver for that. You need to use nrfx driver (https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrfx/drivers/comp/driver.html) directly instead. There is sample from previous case you can look at https://devzone.nordicsemi.com/f/nordic-q-a/78257/using-nrf_connect-zephyr-with-the-comparator-interrupt.

Thanks.

Best Regards,

Kazi Afroza Sultana

[FrancoisG]

Thank you, it looks a bit weird but it does work.

If anyone else is interested, I distilled the example, changed every comp to lpcomp and added it to my simple project here:

github.com/.../20bef5062827cb92d8cb2c6136ccd1e757767391

[QBSho]

Thank you, 

However my DK board is not working with the code. 

But in the .dts also the 

&comp {

compatible = "nordic,nrf-lpcomp";

status = "okay";

};

information and it is still greyed out

BR Sebastian