More GNU/Linux serial problems

Development Tools IDE 1.x
1

Hello everyone,

I have an Arduino Uno R2, I run a GNU/Linux computer with ubuntu maverik 10.10 x86. As everyone else I had serial communication problems and proceeded to flash my firmware to the Arduino-usbserial-uno.hex provided with the distribution (using the dfu-programmer method). I thought that hadn't done anything since every time I try to upload I get the posted error and serial port /dev/ttyACM* disappears from the menu. I tried uploading as root and it worked, than i tried changing the permissions on /dev/ttyACM* but that still didn't fix it. Does anyone have any idea on how to access ttyACM* without privileges? Here is the error I get on the Arduino IDE (version 022):

Error opening serial port '/dev/ttyACM1'.
Binary sketch size: 428 bytes (of a 32256 byte maximum)
processing.app.SerialException: Error opening serial port '/dev/ttyACM1'.
at processing.app.Serial.(Serial.java:146)
at processing.app.Serial.(Serial.java:76)
at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:75)
at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:93)
at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:56)
at processing.app.Sketch.upload(Sketch.java:1603)
at processing.app.Sketch.exportApplet(Sketch.java:1568)
at processing.app.Sketch.exportApplet(Sketch.java:1524)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2293)
at java.lang.Thread.run(Thread.java:636)
Caused by: gnu.io.UnsupportedCommOperationException: Invalid Parameter
at gnu.io.RXTXPort.setSerialPortParams(RXTXPort.java:171)
at processing.app.Serial.(Serial.java:136)
... 9 more
processing.app.debug.RunnerException: Error opening serial port '/dev/ttyACM1'.
at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:99)
at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:93)
at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:56)
at processing.app.Sketch.upload(Sketch.java:1603)
at processing.app.Sketch.exportApplet(Sketch.java:1568)
at processing.app.Sketch.exportApplet(Sketch.java:1524)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2293)
at java.lang.Thread.run(Thread.java:636)

Thanks

2

Are you in the same group as .dev/ttyACM*? You can check this by executing an ls -ls /dev/ttyACM* and then executing an groups command.

3

I added root to my group just to make sure we're together. Here is my output from a few commands

$ ls -ls /dev/ttyACM0
0 crw-rw---- 1 root dialout 166, 0 2011-06-03 15:50 /dev/ttyACM0
$ ls -ls /dev/ttyACM1
0 crw-rw---- 1 root dialout 166, 1 2011-06-03 16:11 /dev/ttyACM1

Than I did:

$ groups diego
diego : diego root adm sudo
$ groups root
root : root diego

I tried again and I can still only access the port running the Arduino IDE with sudo.

4

Try adding (your userid?) diego to the dialout group

5

Still no luck, tried adding myself to the dialout group and even changed the account type to administrator. I can't even select my serial port on the IDE without root privileges.

6

I hate to flaunt my ignorance like this but... When I did this I added myself to the dailout group, not the dialout group (a and i reversed). You have to log out of any existing session to get the new group to take effect. You can check you groups with the command groups. If you can't do:

cat /dev/ttyACM0
or
echo "foo" > /dev/ttyACM0

then it is still an OS permission problem and not related to ardunio IDE.

7

I had same issue, Arduino only working as root user. Standard was already in dialup group. Eventually removed .arduino from my home directory and all resolved.