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Author Topic: More GNU/Linux serial problems  (Read 2201 times)
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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.<init>(Serial.java:146)
   at processing.app.Serial.<init>(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$DefaultExportHandler.run(Editor.java:2293)
   at java.lang.Thread.run(Thread.java:636)
Caused by: gnu.io.UnsupportedCommOperationException: Invalid Parameter
   at gnu.io.RXTXPort.setSerialPortParams(RXTXPort.java:171)
   at processing.app.Serial.<init>(Serial.java:136)
   ... 9 more
processing.app.debug.RunnerException: Error opening serial port '/dev/ttyACM1'.
   at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:99)
   at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:93)
   at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:56)
   at processing.app.Sketch.upload(Sketch.java:1603)
   at processing.app.Sketch.exportApplet(Sketch.java:1568)
   at processing.app.Sketch.exportApplet(Sketch.java:1524)
   at processing.app.Editor$DefaultExportHandler.run(Editor.java:2293)
   at java.lang.Thread.run(Thread.java:636)

Thanks
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Colorado
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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.


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

Code:
$ 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:
Code:
$ 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.
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Colorado
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Try adding (your userid?) diego to the dialout group
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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.
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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.
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