Cannot upload to Arduino Uno any more

Development Tools IDE 1.x
1

Hi all. I was doing some programming when suddenly I couldn't upload anymore to my Arduino Uno board from Ubuntu 10.04. My board is connected with the computer and mounted at /dev/ttyACM0. When I'm trying to upload, I get the following error:

processing.app.SerialException: Error opening serial port '/dev/ttyACM0'.
	at processing.app.Serial.<init>(Serial.java:146)
	at processing.app.Serial.<init>(Serial.java:91)
	at processing.app.SerialMonitor.openSerialPort(SerialMonitor.java:204)
	at processing.app.Editor.handleSerial(Editor.java:2415)
	at processing.app.EditorToolbar.mousePressed(EditorToolbar.java:352)
	at java.awt.Component.processMouseEvent(Component.java:6285)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at java.awt.Component.processEvent(Component.java:6053)
	at java.awt.Container.processEvent(Container.java:2041)
	at java.awt.Component.dispatchEventImpl(Component.java:4651)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Component.dispatchEvent(Component.java:4481)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4235)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
	at java.awt.Container.dispatchEventImpl(Container.java:2085)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4481)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643)
	at java.awt.EventQueue.access$000(EventQueue.java:84)
	at java.awt.EventQueue$1.run(EventQueue.java:602)
	at java.awt.EventQueue$1.run(EventQueue.java:600)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
	at java.awt.EventQueue$2.run(EventQueue.java:616)
	at java.awt.EventQueue$2.run(EventQueue.java:614)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: gnu.io.UnsupportedCommOperationException: Invalid Parameter
	at gnu.io.RXTXPort.setSerialPortParams(RXTXPort.java:171)
	at processing.app.Serial.<init>(Serial.java:136)
	... 35 more

When I try to run the arduino software as root (sudo arduino), everything works fine!!! However, I am in the dialout group. Any suggestions???

2

What is the output of

ls -l /dev/ttyACM0

(that's a minus el)
The fourth column (after "root") will be the group that it is in. I'm guessing it's not "dialout"

What version of the IDE are you running?

3

I found out the solution after a long time of researching. I apologize for double-posting. The answer is more or less found here. The difference is that I couldn't change the contents of the file ~/.arduino/preferences.txt because the arduino software would modidy the value of the parameter serial.debug_rate back to 14400 whenever I was trying to set it to 9600. I finally deleted the folder ~/.arduino and everything now goes like clockwork.

4

WizenedEE:
What is the output of

ls -l /dev/ttyACM0

(that's a minus el)
The fourth column (after "root") will be the group that it is in. I'm guessing it's not "dialout"

What version of the IDE are you running?

BTW, The output is:

crw-rw---- 1 root dialout 166, 0 2012-03-06 04:34 /dev/ttyACM0

After all it was not permissions issue. I had previously set the debug_rate at 14400 and things went wrong from that moment on...

5

Thanks for that huge hint. I had the same symptom, IDE would only download if user was root. If logged on as normal user I got:

Binary sketch size: 2,464 bytes (of a 30,720 byte maximum)
processing.app.SerialException: Error opening serial port '/dev/ttyUSB1'.
	at processing.app.Serial.<init>(Serial.java:178)
	at processing.app.Serial.<init>(Serial.java:77)
	at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:77)
	at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:172)
	at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:67)
	at processing.app.Sketch.upload(Sketch.java:1706)
	at processing.app.Sketch.exportApplet(Sketch.java:1662)
	at processing.app.Sketch.exportApplet(Sketch.java:1634)
	at processing.app.Editor$DefaultExportHandler.run(Editor.java:2346)
	at java.lang.Thread.run(Thread.java:636)
Caused by: gnu.io.UnsupportedCommOperationException: Invalid Parameter
	at gnu.io.RXTXPort.setSerialPortParams(RXTXPort.java:171)
	at processing.app.Serial.<init>(Serial.java:163)
	... 9 more
processing.app.debug.RunnerException: Error opening serial port '/dev/ttyUSB1'.
	at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:101)
	at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:172)
	at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:67)
	at processing.app.Sketch.upload(Sketch.java:1706)
	at processing.app.Sketch.exportApplet(Sketch.java:1662)
	at processing.app.Sketch.exportApplet(Sketch.java:1634)
	at processing.app.Editor$DefaultExportHandler.run(Editor.java:2346)
	at java.lang.Thread.run(Thread.java:636)

Deleting the user .arduino eliminated the Java exception but there was an avrdude problem. I solved the issue by copying .arduino/preferences.txt from root to the user .arduino directory.