Serial Port Plug/Interface issue with Ubuntu-core 16.04 (#2557)

[Simon Fels]

The gadget snap itself is pretty well explained on
https://docs.ubuntu.com/core/en/guides/build-device/gadget which also links
to the official supported gadget snaps you can use for your experiements.

The slot definition can then be added to one of these as explained above.

Another option is that you download one of these gadget snaps from the
store via the snap download command, modify it and then repack it and
generate a new image via ubuntu-image out of it:

$ snap download pi3
$ unsquashfs pi3_*.snap
# Do any modifications to squashfs-root/meta/snap.yaml
$ snapcraft snap squashfs-root
# Now you have a new .snap file snapcraft generated for you
$ ubuntu-image ... --extra-snaps my-gadget.snap ... my-model.assert

Hope that helps.

regards,
Simon


On Tue, Jan 17, 2017 at 10:06 PM, Mritunjai Singh <mrsingh at ssni.com> wrote:

> Can anyone please guide me how to start writing gadget snap which gives me
> access to serial port interface on my Raspberry Pi board and x86_64 ubuntu
> machine.
>
>
>
> Regards,
>
> Mritunjai
>
>
>
> *From:* Mritunjai Singh
> *Sent:* Thursday, January 12, 2017 10:06 AM
> *To:* 'Snapcraft' <snapcraft at lists.snapcraft.io>
> *Subject:* RE: Serial Port Plug/Interface issue with Ubuntu-core 16.04
> (#2557)
>
>
>
> *@Simon Fels*, thanks for the pointer. It would be great if you can
> further guide me writing the gadget snap. I have a Ubuntu x86_64
> machine(VM) to which I will be connecting our RF Mesh network card through
> USB. The network card connects over serial and exposes a /dev/ttys0 port to
> work with. So do I need to write gadget snap for my network card or for my
> Ubuntu machine on which I have already installed snapcraft.
>
>
>
> Please guide and do let me know should you require any further information.
>
>
>
> Regards,
>
> Mritunjai
>
>
>
> *From:* snapcraft-bounces at lists.snapcraft.io [mailto:snapcraft-bounces@
> lists.snapcraft.io <snapcraft-bounces at lists.snapcraft.io>] *On Behalf Of *Simon
> Fels
> *Sent:* Thursday, January 12, 2017 12:58 AM
> *To:* Snapcraft <snapcraft at lists.snapcraft.io>
> *Subject:* Re: Serial Port Plug/Interface issue with Ubuntu-core 16.04
> (#2557)
>
>
>
> You can add a serial port slot to a gadget snap.yaml like this:
>
>
>
> ttyS4:
>
>   interface: serial-port
>
>   path: /dev/ttyS4
>
>
>
> This only applies to static serial port nodes. If you have one provided by
> an USB device you have to user a slightly different slot definition which
> refers the USB product/vendor id of your USB device:
>
>
>
> my-usb-serial:
>
>   interface: serial-port
>
>   usb-product: 0x1111
>
>   usb-vendor: 0x2222
>
>   path: /dev/my-usb-serial-port
>
>
>
> With the path attribute you can select a static path for the serial port
> node which your snap then gets access to once you connected the plug and
> the slot. The path needs to start with /dev/ and afterwards you're free to
> select a free node name. Internally the interface implementation will link
> the right /dev/ttyUSB* node to the specified path.
>
>
>
> Please note that you can define such a slot only on a gadget snap! So if
> you don't have your own gadget snap today, you need to create one for your
> device in order to get access to the serial port.
>
>
>
> I hope that helps.
>
>
>
> regards,
>
> Simon
>
>
>
>
>
> On Wed, Jan 11, 2017 at 7:37 PM, Oliver Grawert <ogra at ubuntu.com> wrote:
>
> hi,
> Am Mittwoch, den 11.01.2017, 17:59 +0000 schrieb Mritunjai Singh:
> > Hi All,
> >
> > Kindly refer to: https://github.com/snapcore/snapd/issues/2557
> >
> > We are trying to get a head start on Core Snappy working with our RF
> > Mesh network card. It connects over serial and needs to be available
> > at boot. We first tried this using snap approach but due to missing
> > hotplugging serial-interface in current(latest) version of snapcraft,
> > serial i/o requests are being denied even if the snap has the
> > permission to use serial port.
> >
> > We have been suggested the gadget snap approach in order to expose
> > /dev/ttyS0 to the serial port interface for tunnccd snap to access
> > it. It would be very helpful if someone can point me to the working
> > example of a gadget snap with access to serial interface or any end
> > to end gadget snap example and its build steps.
>
> note that all our gadgets offer a console on serial by default, if you
> drive some external device via serial you might want to drop this
> console tty option.
>
> all our official gadgets are under https://github.com/snapcore/ ..
> namely the pi2-gadget, pi3-gadget, pc-gadget and dragonboard-gadget
> sub-trees if you want to take a look ...
>
> ciao
>         oli
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