Date: Tue, 25 Nov 2008 22:28:09 +0100 From: Thierry Herbelot <thierry.herbelot@free.fr> To: usb@freebsd.org Subject: concurrent access to multiple endpoints of a USB device ? Message-ID: <200811252228.09926.thierry.herbelot@free.fr>
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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) TfH
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