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' <[email protected]> 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: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Simon Fels Sent: Thursday, January 12, 2017 12:58 AM To: Snapcraft <[email protected]<mailto:[email protected]>> 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 <[email protected]<mailto:[email protected]>> 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 -- Snapcraft mailing list [email protected]<mailto:[email protected]> Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/snapcraft
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