Date: Tue, 13 May 2008 17:55:53 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@freebsd.org Subject: Re: In on control endpoint Message-ID: <200805131755.54080.hselasky@c2i.net> In-Reply-To: <4828AA64.7060306@netwolves.com> References: <4828AA64.7060306@netwolves.com>
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On Monday 12 May 2008, Steve Clark wrote: > Hello List, > > I have spent the afternoon going thru the usb code trying to figure out how > to do a read on the control port (endpoint 80 ? ) instead of a write ( > endpoint 0 ). I am still trying to emulate what the linux sierra.c usb > serial driver does. > > Any pointers would be greatly appreciated. > > Thanks, > Steve > _______________________________________________ > freebsd-usb@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-usb > To unsubscribe, send any mail to "freebsd-usb-unsubscribe@freebsd.org" Hi, All transactions on the control endpoint (0) consist of three parts: SETUP DATA, if any STATUS The two most common variants are: 1) SETUP DATA OUT STATUS IN 2) SETUP DATA IN STATUS OUT Rules: The MSB of the first byte in the SETUP decides wheter the data is OUT (0x00) or IN (0x80). IN and OUT is relative to the USB Host. See: usbd_do_request and /sys/dev/usb/usb.h typedef struct { uByte bmRequestType; uByte bRequest; uWord wValue; uWord wIndex; uWord wLength; uByte bData[0]; } __packed usb_device_request_t; #define UT_WRITE 0x00 #define UT_READ 0x80 #define UT_STANDARD 0x00 #define UT_CLASS 0x20 #define UT_VENDOR 0x40 #define UT_DEVICE 0x00 #define UT_INTERFACE 0x01 #define UT_ENDPOINT 0x02 #define UT_OTHER 0x03 --HPS
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