nRF52840-Dongle zephyr logging cdc acm composite

[ppk2]

Hi,

I'm looking at the zephyr cdc_acm_composite example.

Is it possible to configure zephyr logging module to use the second usb as output?

Br

[Kazi Afroza Sultana]

Hello,

Our nRF52840 dongle had one USB output port. I am not sure what would you like to mean when you say ''second usb''. Though nRF52840 DK has 2 USB outputs. Did you mean the DK?

Thanking you.

Best Regards,

Kazi Afroza Sultana

[ppk2]

Sorry was poorly explained by me. The cdc acm composite example creates two com ports from the dongle, I was wondering if there was any example that uses one of the uart/com-ports for the logging module? 

I guess there is more to it than just setting:

CONFIG_LOG=y

CONFIG_LOG_BACKEND_UART=y

[Kazi Afroza Sultana]

Hello,

This is the example https://docs.zephyrproject.org/latest/reference/usb/uds_cdc_acm.html#console-over-cdc-acm-uart you can look at.

Best Regards,

Kazi Afroza Sultana

[ppk2]

Hi, thank you! This worked, now I got both logging and printk working, printing to either uart0 or uart1.

Is there a way to differentiate the two of them? Make logging output to uart1 and printk output to uart0?

Since I only have the dongle and no debug alternatives my goal is to use uart1 for logging and debugging, and uart0 for the actual application. I can probably use the zephyr UART API for uart0/application but the functionality of printk makes everything much easier.

[Kazi Afroza Sultana]

Hi,

Dongle is not designed for debugging. You can find the tutorial of dongle here nRF52840 Dongle Programming Tutorial - Getting Started - nRF5 SDK guides - Nordic DevZone (nordicsemi.com). You better try this with nRF52840 DK. 

Best Regards,

Kazi Afroza Sultana