Qt - serial port name in ubuntu

Question

I have a problem finding the serial port name on Ubuntu. As you know, we can use this code to read the serial port on Windows, for example:

serial->setPortName("com3");

but when I compile this code on Ubuntu I cannot use this code:

serial->setPortName("/dev/ttyACM0");

I know the name of my serial port is ttyACM0 and I can read data on it by issuing this command:

cat /dev/ttyACM0

but why can't I use this name in my code? What should I do?

+2

user4000670 11 oct. 14 at 11:26

2 answers

lpapp · Answer 1 · 2014-12-29T08:23:41+0000

To get permission for a regular user, please add your sysadmin to the group that is responsible for serial ports like emulated via usb.

It's either tty

, uucp

or something. It varies from distribution to distribution, but you can check it easily by running the following command:

ls -l /dev/ttyACM0

Then check the group column and run sysadmin:

sudo usermod -a -G group username

Please do not detect security vulnerabilities by granting global write access to others as follows:

sudo chmod 666 /dev/ttyACM0

Oleg shparber · Answer 2 · 2014-10-11T14:40:23+0000

Using:

serial->setPortName("ttyACM0");