USB CDC ACM Sample Application stuck on " Wait for DTR"

[sir_hugo]

I'm tryin to get the USB CDC ACM Sample Application to work on my nRF52840DK board (https://docs.zephyrproject.org/2.6.0/samples/subsys/usb/cdc_acm/README.html).

I've followed the steps exactly but it's stuck at "Wait for DTR". Is this application meant to work with a USB cable only or do I need to an FTDI chip?

[sir_hugo]

Any idea which settings in Putty?

[Einar Thorsrud]

The settings should be as described in How to connect with PuTTY. When I test on my end I see the following in the RTT log.

Immediately after reset:

00> [00:00:00.256,103] <inf> cdc_acm_echo: Wait for DTR

After plugging in the USB cable:

00> [00:02:27.090,759] <inf> usb_cdc_acm: Device suspended
00> [00:02:27.236,419] <inf> usb_cdc_acm: Device resumed
00> [00:02:27.236,450] <inf> usb_cdc_acm: from suspend
00> [00:02:27.306,884] <inf> usb_cdc_acm: Device configured

After connecting with a terminal emulator (like PuTTY):

00> [00:03:03.178,833] <inf> cdc_acm_echo: DTR set
00> [00:03:04.202,575] <inf> cdc_acm_echo: Baudrate detected: 115200

And then in the terminal emulator you should see that you can write characters and they are echoed back (so that you see what you write).