Date: Tue, 25 Nov 2008 15:49:05 -0800 From: Alfred Perlstein <alfred@freebsd.org> To: Thierry Herbelot <thierry.herbelot@free.fr> Cc: usb@freebsd.org Subject: Re: concurrent access to multiple endpoints of a USB device ? Message-ID: <20081125234904.GP28578@elvis.mu.org> In-Reply-To: <200811252228.09926.thierry.herbelot@free.fr> References: <200811252228.09926.thierry.herbelot@free.fr>
next in thread | previous in thread | raw e-mail | index | archive | help
* Thierry Herbelot <thierry.herbelot@free.fr> [081125 13:51] wrote: > Hello, > > (this is with the old USB stack, on a -slow- 7.1 i386 machine) > > I'm playing with a USB2.0 device which exposes multplie endpoints (control on > EP0, then bulk endpoints 1, 2 and 3). > > When I run a control application doing EP0 requests simultaneously with > another process reading off EP2, the reading process only gets errors : > "Received -1 vs 65536 bytes requested ep 2 errno=5 (Input/output error)" > > The control application by itself works correctly. > > I'm using a simple read system call to read from ugen0.2 : > "nb_bytes = read(ep_fd[2], buf, nb);" > > Is there anything I should do to for example increase the ep2 buffer size ? > (maybe I should also try the new USB stabck, for sure) Give usb2 a shot. Hans is pretty on top of issues in it. -- - Alfred Perlstein
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20081125234904.GP28578>