[yocto] TtyUsb Yocto Issue

[Jawad Hassan]

Hi Paul,

Thanks for your reply, but we're not seeing any ttyUSB* entries in the /dev
folder, the board is this one here:
http://boundarydevices.com/products/nitrogen6_lite/

Which should have at least one port available for connection.

But unfortunately we aren't seeing this device node. What should be our way
forward with this?

Thanks in advance!


On Tue, Oct 8, 2013 at 9:04 AM, Paul Eggleton <paul.eggleton at linux.intel.com
> wrote:

> Hi Jawad,
>
> On Tuesday 08 October 2013 06:43:18 Jawad Hassan wrote:
> > We're trying to access the USB serial port using rxtx on a java
> application
> > on Yocto. The problem is that we're unable to list out any ports on the
> > Nitrogen Lite board, we think this could be a permissions issue, if
> anyone
> > has been able to do this or any resources that can help us in getting
> this
> > done.
>
> It's hard to say for sure without further details, but assuming the device
> nodes actually exist in /dev and it's a typical device permissions issue
> there
> are two options:
>
> 1) Look at the /dev/ttyUSB* device nodes that exist and see if there is
> already a group assigned with write access; if so you just need to ensure
> the
> user you are running as is a member of that group.
>
> 2) Create a udev rule to set the device permissions correctly. This would
> be a
> matter of creating a recipe to install an extra file to /etc/udev/rules.d
> that
> assigned the desired permissions. There are lots of HOWTOs out there on the
> web for this, e.g.:
>
>
> http://sourceforge.net/apps/mediawiki/gizmod/index.php?title=HOWTO_-_Setting_Input_Device_Permissions_-_Creating_a_udev_Rule
>
> Cheers,
> Paul
>
> --
>
> Paul Eggleton
> Intel Open Source Technology Centre
>



-- 
*Jawad Hassan*
Software Engineer
*Emblem Technologies (Pvt) Ltd*
*Uzair Pte Ltd, Singapore*
Skype: jawad at emblemtechnologies.com

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