nRF9160 lpuart sample Async API not working with nrf9160dk

[Al Ex]

I'm trying to make use of the Async UART API with an nRF9160dk using NCS v2.1.2. As a starter application, I'm using the lpuart sample in nrf/samples/peripheral/lpuart. I'm able to build this project for the nrf9160dk without errors, however the Async API fails to get enabled. When inspecting the prj.conf file in Visual Studio Code, all config options related to UART 1 have a yellow underline with the notice that the config received a different value to what was assigned as the UART_1_NRF_UARTE dependency was missing. I'm unable to enable this dependency manually as it's not a user configurable setting. I'm wondering what I need to do in order to enable the Async UART API. I'd previously used it with NCS v1.9.0 without issues, so I'm wondering what I need to do to get it working again.

Thank you

[Amanda Hsieh]

Hi, 

We are looking into this issue and will update it later. 

Regards,
Amanda H.

[Amanda Hsieh]

Hi, 

Please make sure to build the sample for nrf9160dk_nrf9160_ns. 

You could check the .config under build\zephyr to see whether CONFIG_UART_1_NRF_UARTE=y and CONFIG_UART_1_ASYNC=y are included. I see the VS Code showing that information, but CONFIG_UART_1_NRF_UARTE and CONFIG_UART_1_ASYNC are actually enabled in the .config file. 

-Amanda H

[Al Ex]

Thank you Amanda - I've checked the .config file and can see that CONFIG_UART_1_NRF_UARTE=y and CONFIG_UART_1_ASYNC=y are in fact included as you say despite what VS Code is showing.