amples/subsys/usb/cdc_acm_composite: Stuck at "Wait for DTR"

[cinlyooi-intel]

Describe the bug
The last message is "Wait for DTR". Next message "DTR set, start test" not displayed.

Looks like the program is stuck at uart_line_ctrl_get() command

To Reproduce
Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -DBOARD=sam_e70_xplained -DARCH=arm -D-DOVERLAY_CONFIG=overlay-composite-cdc-msc.conf .. #sam_e70_xplained:arm
3. make
4. See error

Other targets:

• -DBOARD=nrf52840_pca10056 -DARCH=arm 
  

• -DBOARD=frdm_k64f -DARCH=arm
  

Screenshots or console output

***** delaying boot 1000ms (per build configuration) *****
***** Booting Zephyr OS v1.14.0-rc1-444-gb1a7e71436 (delayed boot 1000ms) *****
Wait for DTR

Environment (please complete the following information):

• OS: Fedora
• Toolchain: Zephyr
• Commit SHA or Version used: b1a7e71

[cinlyooi-intel]

Most likely we will find it is the same reason as #13662

[jfischer-no]

what is the difference to #13662?

[nashif]

duplicate