nRF5340 UART driver doesn't exit low power mode when it receives data

[ronbo999]

Hi,

In the attached hello world example that I modified for the nRF5340DK board, the nRF UARTE serial driver doesn't exit low power mode when I type any characters on my TeraTerm window.

If you comment out the following line:

CONFIG_PM_DEVICE_RUNTIME=y

my hello world application starts working correctly.

3173.hello_world.zip

[ronbo999]

I forgot to mention that I'm using NCS 2.9 release.

[Hieu]

Hi ronbo999,

I believe the driver simply doesn't support automatically transition out of low power state.

I will look into whether the general Zephyr driver design convention supports this and see what can be done about it. I will update you this week.

Hieu