Usb Port Binding

Ports

What ports are in use? Test by plugging and unplugging the USB device.

$ ls /dev/tty*

Killing a Process

In order to determine what process is using a tty port you run the command.

$ ps -aux |grep tty

This will list the process that is using the tty port. If the owner of the process is root, you must kill the process as root.

Port Permissions

It is possible that you need to remove binding to a USB port. The following is helpful if you have USB1 and USB0 does not show up.

Run

$ ls /sys/bus/usb/drivers/

To see what drivers you have. It is likely that CP210x is the one that is working

$ tree /sys/bus/usb/drivers/CP210x/ with show the device innformation

    /sys/bus/usb/drivers/ub/

    |– 1-1:1.0 -> ../../../../devices/pci0000:00/0000:00:1d.7/usb1/1-1/1-1:1.0

    |– bind

    |– module -> ../../../../module/ub

    `– unbind

In order to unbind a device from a driver, simply write the bus id of the device to the unbind file:

YOU WILL NEED TO DO THIS AS ROOT

PAY REEL ABI

   echo -n “1-1:1.0” > /sys/bus/usb/drivers/ub/unbind

and the device will no longer be bound to the driver:

   $ tree /sys/bus/usb/drivers/ub/

    /sys/bus/usb/drivers/ub/

    |– bind

    |– module -> ../../../../module/ub

    `– unbind

Killing jobs.,

If stopped jobs on ttymidi a kill will not kill you need to use