Date: Tue, 9 Oct 2007 21:39:35 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@freebsd.org Subject: Re: help for understand the usb calls: Message-ID: <200710092139.36278.hselasky@c2i.net> In-Reply-To: <dc2adf190710091038p36fa5009h299ecdb400581b87@mail.gmail.com> References: <dc2adf190710091038p36fa5009h299ecdb400581b87@mail.gmail.com>
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On Tuesday 09 October 2007, GAURAV GUPTA wrote: > Hi all, > > My name is tarru .i am trying to understand the usb call . > > and currently i got struck and i would like to know the difference > between functions. > > > usbd_transfer() > > and > > usbd_do_request() > > are we doing anything different ? .i confused since in both cases we are > transferring/queering for data to usb device > > Please let me know if anybody can help on this > > Thanks, > > Tarru Hi, "usbd_do_request()" is a wrapper function for "usbd_transfer()" that does synchronous control transfers on endpoint zero only. --HPS
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