Logging over USB CDC ACM with nRF52840 Dongle

RE: Logging over USB CDC ACM with nRF52840 Dongle

Usha — Wed, 05 Mar 2025 10:55:52 GMT

i can't see any logs

RE: Logging over USB CDC ACM with nRF52840 Dongle

lara — Mon, 16 Dec 2024 17:34:24 GMT

iam new to nrf52840 dongle,iam trying to read/write in it.but i kept on facing the error.but i cannot see the error in putty.iam compiling in vs code,uploading hex in programmer tool in nrf,seeing log in putty.but when i upload the nvs code some error is there ,the putty uart port cannot open.how to see the log in another way.also r u trying nvs in nrf52840 dongle? pls help me to debug

devzone.nordicsemi.com/.../nvs-_2800_2_2900_.zip

RE: Logging over USB CDC ACM with nRF52840 Dongle

Crexodon — Fri, 09 Aug 2024 13:46:08 GMT

Hi,
thanks, this was the solution. Removing both the chosen and additional cdc acm device from the overlay and using the correct device in the main.c file results in the logger working on the nRF52840 Dongle!

RE: Logging over USB CDC ACM with nRF52840 Dongle

Hieu — Fri, 09 Aug 2024 13:17:05 GMT

Hi Crexodon,

The nrf52840dongle_nrf52840 target already has a USB CDC ACM instance in its Devicetree by default. With your overlay, another instance was created.

The logs go to the console output by default, and you have set it to your new instance, cdc_acm_uart0.

Meanwhile, in main.c, you setup the echo behavior on one UART instance, and don't care which. It seems that the dongle's default instance was selected here.

That's the nature of the issue. Here are a couple of immediate ways around this:

- Remove the new CDC ACM UART device
- In main.c, select the specific CDC ACM UART device you want instead of just any one of them

RE: Logging over USB CDC ACM with nRF52840 Dongle

Crexodon — Thu, 08 Aug 2024 23:56:35 GMT

Hi,

here's the .config and zephyr.dts for the dongle:

devzone.nordicsemi.com/.../6036.zephyr.dts

devzone.nordicsemi.com/.../0285_2E00__5F00__2E00_config

and here's both files for the dk:
devzone.nordicsemi.com/.../8475.zephyr.dts

devzone.nordicsemi.com/.../_5F00__2E00_config

I'm also on ncs version 2.4.3

RE: Logging over USB CDC ACM with nRF52840 Dongle

Hieu — Thu, 08 Aug 2024 10:16:11 GMT

Hi Crexodon,

Could you please share you compiled zephyr.dts and .config file?

Hieu