[NRF5 SDK] Usbd_cdc_acm don't close port

[neicureuil]

Hi,

I'm making an firmware for the nrf52840 that communicate throw usb to a computer.

First I used the uart library that works fine but required the Jtag and Jling which is integrated to the development board to be seen by the computer as a serial communication port.

But my objective if to put the firmware on nrf52840 dongle that don't have the Jtag and Jling.

After few research, I found that I need to implement the USBD_CDC_ACM to my firmware which permit to be able to see the serial port on the computer.

However, for my use case, I need to not close the serial connection during a board reboot (with JTag, when the board reboot, the serial port doesn't close and so, my program on my computer doesn't need to reopen the port and can just wait a serial event) but with usbd_cdc_acm the serial port is automatically closed and need to be reopen by the computer.

Is it possible to change that ?

Also, is it possible to disable the DTR (Data Terminal Ready) capability of Usbd like its done with JTag and Uart ?

Regards

Used sdk :

- nRF5_SDK_17.0.2

- nrf5_SDK_for_Mesh_v5.0.0

[Amanda Hsieh]

Hi, 

The first question is duplicated as this case, and my colleague has answered. 

is it possible to disable the DTR (Data Terminal Ready) capability of Usbd like its done with JTag and Uart ?

 I am afraid not. See this answer. 

-Amanda H.