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Topic: Permission denied on /dev/ttyACM0 (Read 57476 times) previous topic - next topic

Indranil_Mukherjee

First time programming in Arduino (or any micro-controller) .. using Linux distro .. Manjaro KDE.. Arduino 1.8.3 ...
IC Atmega328P .. on Uno board.
My error message :
Arduino: 1.8.3 (Linux), Board: "Arduino/Genuino Uno"

Sketch uses 710 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied
Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
...
code is pretty simple
void setup() {
  // put your setup code here, to run once:
  pinMode(13, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(13, HIGH);

}
...
I've two USB ports .. USB2.0 and USB3.0 ... connected the arduino UNO to USB2.0 via cable ... when I connect the board to usb, the power led was on (red) ... and the yellow LED above RX,TX was blinking. Need help
 

dannable

Google returned over 6,000 results when I searched for that error message. What have you tried?
Beginners guide to using the Seeedstudio SIM900 GPRS/GSM Shield

tf68

In a terminal, with the board plugged in, enter.
ls -l /dev/ttyACM*, this will show the group that has access to the port.

Example: crw-rw-r-- 1 root dialout ... /dev/ttyACM0, root is owner, dialout is the group with access.

Entering the command, groups, in a terminal will show the groups you belong to.

sudo adduser YourUserName GroupToJoin  Will fix things if you need to join a group, logout and login after you run adduser.

modem-manager can also be a problem -- most people just remove the package.

anilkunchalaece

try the following command

sudo chmod a+rw /dev/ttyACM0


--

Check this link for more info https://www.youtube.com/watch?v=Z2hlBbZu3CI
--
Check Arduino  Tutorials here
https://www.youtube.com/playlist?list=PLjzAdjfnefPzBOijmWo9t6-S2x2jye2fs

Kunchala Anil

megustacomicsans

In a terminal, with the board plugged in, enter.
ls -l /dev/ttyACM*, this will show the group that has access to the port.

Example: crw-rw-r-- 1 root dialout ... /dev/ttyACM0, root is owner, dialout is the group with access.

Entering the command, groups, in a terminal will show the groups you belong to.

sudo adduser YourUserName GroupToJoin  Will fix things if you need to join a group, logout and login after you run adduser.

this did it for me as i ended up here with same problem as OP.  i always forget this set of commands and have this sort of trouble every time i try to hook up a 3d printer to a fresh linux install.  I ended up here now from trying to program an Arduino Uno.

THANK YOU!

phantarei

try the following command

sudo chmod a+rw /dev/ttyACM0


--

Check this link for more info https://www.youtube.com/watch?v=Z2hlBbZu3CI
Thank you! Worked for me!

Branrickman

try the following command

sudo chmod a+rw /dev/ttyACM0


--

Check this link for more info https://www.youtube.com/watch?v=Z2hlBbZu3CI
Working on Ubuntu 18.04.1 LTS on an arduino UNO r3 via USB, and this fixed the issue for me.


Thanks Anil!



Here's what I think the fix is doing: chmod is a utility that modifies privileges. What this command is doing is changing privileges for /dev/ttyACM0, the port we're trying to write to the arduino with. We're running chmod a+rw. The "a" signifies that we're in a-mode, which modifies all users, and the "+rw" means we "+" (add)  "rw" (read and write permissions).

betobetok

I had the same problem, I try to load a Blink test program in an generic Arduino UNO with a laptop with Linux Ubuntu 16.04 LTS, but when i change the permissions with the command "sudo chmod 777 /dev/ttyACM0" (the ttyACM0 is the USB port were I had connected the Arduino board) the problem still present. someone know what will be the problem? I try even to change the group for my user, wit the command "sudo usermod -a -G dialout userA".

kimmosiljander

Hi!

I have this problem:

avrdude: usbdev_open(): cannot open device: Permission denied
avrdude: jtag3_open_common(): Did not find any device matching VID 0x03eb and PID list:

Anyone have any ideas how to solve this? Permissions looks like this:

crw-rw-rw- 1 root dialout 166, 0 huhti  4 12:21 /dev/ttyACM0

Br.
Kimmo

kimmosiljander

Hi!

Now I get this error:

avrdude: usbdev_open(): WARNING: failed to set configuration 1: Device or resource busy
avrdude: WARNING: invalid value for unused bits in fuse "fuse5", should be set to 1 according to datasheet
This behaviour is deprecated and will result in an error in future version
You probably want to use 0xcd instead of 0xc9 (double check with your datasheet first).


Br.
Kimmo

hizmarck

try the following command

sudo chmod a+rw /dev/ttyACM0


--

Check this link for more info https://www.youtube.com/watch?v=Z2hlBbZu3CI
Thank you! Worked for me!

Zbysekz

#11
May 31, 2019, 07:30 pm Last Edit: May 31, 2019, 07:32 pm by Zbysekz
Just set current user to belong to "dialout" group which is the one who members are allowed to access ports.

Run follwing:

sudo adduser yourUserName dialout

then relog to take effect

(Ubuntu 18.04)

sudhanv

i tried both the solutions and they worked but when i unplug my board and replug it,i have to run the command again...
is there a permanent fix to it

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