Multiple UART over USB

[lseg]

Hi,

I noticed all of your DK have multiple UART over the USB port. I believe some are from the nRF91 or nRf70 etc and some form the Segger module.

For a new HW design I am wondering if following is possible: I would like to have 2 (or even 3) UART Channels over the USB port.

1 for logging and shell, 1 for specific commands (maybe uploading downloading files etc and maybe a 3rd one to forward logs from another chip on our device.

So the main question is can multiple uart easily be routed to 1 Physical USB (I guess yes since you do it on your DK) and how is this done?

Kind regards,

Luc Segers

[Charlie]

Hi Luc,

On most nRF DK boards, an interface IC works both as JLINK-OB and UART-USB converter on them.

You can refer to this page about the design of nRF9160DK: Virtual serial port (nordicsemi.com).

Best regards,

Charlie

[lseg]

https://docs.nordicsemi.com/bundle/ug_nrf9160_dk/page/UG/nrf91_DK/hw_description/nrf9160_board_controller.html

So in this case it is the Segger that acts as an interface IC to translate 3 uarts to different com ports on the USB.

Mmm, that IC is not an option for our board.

[Charlie]

One zephyr sample sdk-zephyr/samples/subsys/usb/cdc_acm_composite at v3.5.99-ncs1 · nrfconnect/sdk-zephyr (github.com) demonstrates how to get two virtual com ports on my USB connection.

Best regards,

Charlie