Can't build project based on CDC ACM USB sample for NRF9160DK

[MarioDLH]

Hi.

I'm working on a project based on the USB CDC ACM sample from Zephyr, which builds correctly for nRF5340DK, but gives an error when trying to build for nRF9160DK due to an app.overlay file. I'm building using the nRF Connect SDK for VSCode. This is the output:

-- Found devicetree overlay: C:/Users/mario/OneDrive/Escritorio/bls-hsm/remote-signer/app.overlay
Error: c:\Users\mario\OneDrive\Escritorio\bls-hsm\remote-signer\build_1\nrf9160dk_nrf9160_ns.dts.pre.tmp:642.1-13 Label or path zephyr_udc0 not found
FATAL ERROR: Syntax error parsing input tree
CMake Error at C:\ncs\v1.8.0\zephyr\cmake\dts.cmake:225 (message):
  command failed with return code: 1
Call Stack (most recent call first):
  C:\ncs\v1.8.0\zephyr\cmake\app\boilerplate.cmake:545 (include)
  C:\ncs\v1.8.0\zephyr\share\zephyr-package\cmake\ZephyrConfig.cmake:24 (include)
  C:\ncs\v1.8.0\zephyr\share\zephyr-package\cmake\ZephyrConfig.cmake:35 (include_boilerplate)
  c:\Users\mario\OneDrive\Escritorio\bls-hsm\remote-signer\build_1\CMakeLists.txt:7 (find_package)

Regards.

[Didrik Rokhaug]

Hi,

The nRF9160 does not have a USB peripheral.

The overlay file is therefore not able to modify the USB node in the device tree (because there are no USB nodes in the device tree).

Best regards,

Didrik

[MarioDLH]

Isn't it possible to use the port used to flash the board as an USB peripheral?

[Didrik Rokhaug]

No. That port is connected to the interface MCU.

The interface MCU serves two functions:

1. On-board-debugger, for debugging and programming the nRF9160 and nRF52840 on the DK.

2. USB <-> UART bridge.

However, the nRF9160 have no way of controlling the functionality of the interface MCU.

[MarioDLH]

Ok, thanks for clarifying this.