Date: Tue, 13 Jul 2010 10:59:25 +0200 From: Peer Stritzinger <peerst@gmail.com> To: Hans Petter Selasky <hselasky@freebsd.org> Cc: freebsd-usb@freebsd.org Subject: Re: read(2) always returns 0 when reading from /dev/usb/n.m.k bulk IN endpoint Message-ID: <AANLkTimEW37MMVnlwJjF48ChV8FEWi8deX9cxoX-F4yM@mail.gmail.com> In-Reply-To: <AANLkTikQ4bShI8vgjMjoFn7y6fw1qqXYCZFKInmQ5Pm7@mail.gmail.com> References: <AANLkTikOoAnGG4TN-lZf8VC3bF48u-oEXoSR3E8TOyiH@mail.gmail.com> <201007122020.02934.hselasky@freebsd.org> <AANLkTikQ4bShI8vgjMjoFn7y6fw1qqXYCZFKInmQ5Pm7@mail.gmail.com>
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Hi, FYI: just tried using the short xfer ioctl, but the behavior didn't change. in = open (argv[0], O_RDONLY); ioctl(in, USB_SET_RX_SHORT_XFER, 1); n = read(in, buf, NBUF); now trying libusb for this. -- Peer On Mon, Jul 12, 2010 at 10:41 PM, Peer Stritzinger <peerst@gmail.com> wrote: > Hi, > > On Mon, Jul 12, 2010 at 8:20 PM, Hans Petter Selasky <hselasky@freebsd.org > > wrote: > >> On Monday 12 July 2010 19:22:28 Peer Stritzinger wrote: >> > However the read always returns 0. >> > >> > Tried different buffer sizes etc. >> Hi, >> >> Maybe you are missing to set the short transfer OK flag. >> >> Else I recommend using LibUSB. >> >> --HPS >> > > Did'nt set this flag (not doing any ioctls on the ugen device at all). > > However I did try matching either the max packetlen, or the read buffer > size with the actual bytes sent, so I thought it shouldn't matter. > > I'll move on to libusb and not waste any more time with the raw interfaces. > > Thanks > -- Peer >
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