nRF52 DK and UART over USB

[Fabien Comte]

Hello, I wish to use UART over USB.

If I use pins P0.05 to 8 (i need HW flow control), is that the serial port detected in Windows ?

[Einar Thorsrud]

Yes. The UART pins (P0.05 to 8 as you write) are internally connected to the on-board Segger debugger chip and it will be available on you PC as normal COM port. For this you do not have to connect TX, RX, RTS and CTS to the PC. It will be seen as "JLink CDC UART Port (COM*)" in Windows.

[Fabien Comte]

Thank you.

[Nabil]

Hello,

Is it also available on linux ?

[Einar Thorsrud]

Yes, this works on Linux as well, and you should see the UART device as /dev/ttyACMx. (You have to install the J-Link Software Pack in order to use it.)

[Nabil]

I'm working on linux.

Putty doesn't work but I'm using " cu " :

cu -l /dev/ttyACMx -s 115200 --parity=none

[Einar Thorsrud]

You need to replace the 'x' in /dev/ttyACMx with the correct number in your case, typically 0. (You should be able to see it from dmesg when you plug in the device, and also /var/log/messages or /var/log/syslog). One way to determine t is to grep for ttyACM:

dmesg | grep ttyACM