Use D+ and D- for Debug Serial Output

[aplatts]

Hi

I've been developing using an NRF52 DK and have moved onto my own design board, I have one small problem which I'm unable to replicate using the DK. On my own board, I have D+ and D- connected up to a USB connector but as yet unused (for future development). I have a J-Link connected to the SW interface, all is working fine.

My question is can I redirect serial debugging output via D+ and D- (e.g. NRF_LOG_INFO output via D+ and D-)?

Thanks

Andrew

[ovrebekk]

Hi Andrew

If I understand you correctly you want to set up the USBD interface in the nRF52 device (nRF52840?) to send serial data over the USB interface?

Unfortunately the NRF_LOG API doesn't have it's own USB CDC backend, for easily outputting data over USB, but if you use the CLI module you can route logging and CLI commands through USB CDC. The drawback of this method is that you need to add CLI to your example, if you're not already using it. 

Best regards
Torbjørn

[aplatts]

HI

Thanks, I'll look at adding CLI to my project. Am I able to update firmware via the USBD interface?

Thanks

Andrew

[ovrebekk]

Hi Andrew

Yes, we have a USB backend for our DFU (bootloader) solution, so you can update both the SoftDevice stacks and the application over USB. 

Best regards
Torbjørn

[aplatts]

Is there a tutorial or example I could follow?

[ovrebekk]

Hi Andrew

Yes, some of the examples in the \nRF5_SDK_17.0.0_9d13099\examples\dfu\open_bootloader and \nRF5_SDK_17.0.0_9d13099\examples\dfu\secure_bootloader folders are targeted at USB. 

Best regards
Torbjørn