Date: Mon, 08 Dec 2014 07:50:39 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Torfinn Ingolfsen <torfinn.ingolfsen@getmail.no>, freebsd-usb@FreeBSD.org Subject: Re: Is writing usb devices as files (via /dev/ugen*) supported in FreeBSD? Message-ID: <54854A3F.1090807@selasky.org> In-Reply-To: <20141207235213.059d82613b8ca0fa0f14b78e@getmail.no> References: <20141207235213.059d82613b8ca0fa0f14b78e@getmail.no>
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On 12/07/14 23:52, Torfinn Ingolfsen wrote: > Hello, > Question: is writing to the device file (/dev/ugenX) with normal file calls supposed to work in FreeBSD? > (as in "everything is a file" in unix-like operating systems) > > Background: I recently got a usb label printer for cheap: a Dymo LabelManager PnP[1]. I found the dymoprint[2] Python script, which works fairly well on Linux. > It works (AFAICT) by reading / writing the usb device as a regular file, via the device file. > You have to use usb_modeswitch[3] on the printer first, of course. Hi, /dev/ugenX is not a stream. You should either consider using libusb or /dev/ulptX . If it is supposed to work with those devices, you should postfix the endpoint number: /dev/usb/3.4.z --HPS > > Since we have all tools available on FreeBSD, I tried the setup on my FreeBSD workstation, which currently runs FreeBSD 9.3-stable: > tingo@kg-core1$ uname -a > FreeBSD kg-core1.kg4.no 9.3-STABLE FreeBSD 9.3-STABLE #0 r273918: Fri Oct 31 22:52:44 CET 2014 root@kg-core1.kg4.no:/usr/obj/usr/src/sys/GENERIC amd64 > > The detection code in the dymoprint script doesn't work on FreeBSD, but setting the correct device via DEV_NODE in the script works: > tingo@kg-core1$ grep ^DEV_NODE dymoprint2 > DEV_NODE = "/dev/ugen3.4" > > But when I run the script I just get an IO error: > root@kg-core1# python dymoprint2 test > Traceback (most recent call last): > File "dymoprint2", line 313, in <module> > main() > File "dymoprint2", line 309, in main > lm.printLabel(labelmatrix, dottab) > File "dymoprint2", line 183, in printLabel > response = self.sendCommand() > File "dymoprint2", line 80, in sendCommand > responseBin = self.dev.read(8) > IOError: [Errno 5] Input/output error > > > References: > 1) http://global.dymo.com/ieIE/Products/LabelManager_PnP.html > 2) http://sbronner.com/dymoprint/ > 3) http://www.draisberghof.de/usb_modeswitch/ >
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