avr usb port doesn't stay connected

[bnusbick]

When I try to load a sketch as avr on lubuntu 14.04, it doesn't see ttyACM0.  When I look at dmesg after plugging in the USB cable, I see the following:

 

[ 3926.056332] usb 7-1: new full-speed USB device number 8 using uhci_hcd
[ 3926.229344] usb 7-1: New USB device found, idVendor=1d50, idProduct=60a5
[ 3926.229356] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 3926.229364] usb 7-1: Product: USB IO Board    
[ 3926.229370] usb 7-1: Manufacturer: Unknown    
[ 3926.231265] cdc_acm 7-1:1.0: This device cannot do calls on its own. It is not a modem.
[ 3926.231317] cdc_acm 7-1:1.0: ttyACM0: USB ACM device
[ 3926.241342] input: Unknown     USB IO Board     as /devices/pci0000:00/0000:00:1d.1/usb7/7-1/7-1:1.2/input/input19
[ 3926.241760] hid-generic 0003:1D50:60A5.0007: input,hidraw1: USB HID v1.01 Mouse [unknown     USB IO Board    ] on usb-0000:00:1d.1-1/input2
[ 3926.996188] usb 7-1: USB disconnect, device number 8

 

Notice how the last message is a disconnect,

 

When I plug in an arduino UNO, I see the following with no disconnect, and I do see ttyACM0 as a port choice in DesignLab 1.07:

[ 2431.588322] usb 7-1: new full-speed USB device number 7 using uhci_hcd
[ 2431.789434] usb 7-1: New USB device found, idVendor=2341, idProduct=0043
[ 2431.789447] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=220
[ 2431.789455] usb 7-1: Manufacturer: Arduino (www.arduino.cc)
[ 2431.789461] usb 7-1: SerialNumber: 649353435333517072D0
[ 2431.791364] cdc_acm 7-1:1.0: ttyACM0: USB ACM device
 

I did run ./ubuntu-setup.sh and it says libftdi-dev is already the newest version.

 

What do I need to do to be able to get the AVR usb to work under lubuntu 14.04?

 

Thanks,

Blake

 

 

 

 

[bnusbick]

I resolved this issue by moving SW1 to the opposite position. 

 

I then couldn't down load the code due to the following message:

avrdude: ser_open(): can't open device "/dev/ttyACM0": Device or resource busy

 

After trying several suggestions to no avail, the following worked for me:

sudo apt-get purge modemmanager

 

Blake

[Jack Gassett]

Hey Blake,

 

It sounds similar to a problem that happens in Windows. If you have a sketch running that outputs data on the serial port then the drivers will pick up your device as a serial mouse and start treating the data that it receives as mouse data! Under windows turning off the serial mouse enumeration solves the problem, or adding a 2-3 second delay to your sketch before it starts outputting data will also help.

 

Good to know how to disable it under linux too.

 

Thanks,
Jack.