How to config Zephyr if want to output debug message through USB port on nrf52840 dongle

Question

Hi, 
 I want to output debug message(printk) through USB port on nrf52840 dongle. how to config it in zephyr, I have read the HelloWorld project code, but got nothing, 
 
 thanks

Håkon Alseth · Accepted Answer

Hi, 
 
 Here's an example that sets up usb cdc acm: 
 https://github.com/nrfconnect/sdk-zephyr/tree/v2.7.99-ncs1-1/samples/subsys/usb/cdc_acm 
 
 You can add these lines to the overlay to use that backend for the console: 
 https://github.com/nrfconnect/sdk-zephyr/blob/v2.7.99-ncs1-1/samples/subsys/usb/console/app.overlay#L7-L11 
 Or you can try the console sample, which does this: 
 https://github.com/nrfconnect/sdk-zephyr/tree/v2.7.99-ncs1-1/samples/subsys/usb/console 
 
 Kind regards, 
 Håkon

How to config Zephyr if want to output debug message through USB port on nrf52840 dongle

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