From owner-freebsd-hackers@FreeBSD.ORG Sat Jun 28 02:37:13 2003 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EF04137B401 for ; Sat, 28 Jun 2003 02:37:12 -0700 (PDT) Received: from cs.huji.ac.il (cs.huji.ac.il [132.65.16.30]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5211F43FE9 for ; Sat, 28 Jun 2003 02:37:12 -0700 (PDT) (envelope-from danny@cs.huji.ac.il) Received: from pampa.cs.huji.ac.il ([132.65.80.32] ident=danny) by cs.huji.ac.il with esmtp id 19WC8s-0006B0-00 for freebsd-hackers@freebsd.org; Sat, 28 Jun 2003 12:37:10 +0300 X-Mailer: exmh version 2.6.3 04/04/2003 with nmh-1.0.4 To: freebsd-hackers@freebsd.org In-reply-to: Your message of Wed, 25 Jun 2003 10:15:49 -0600 (MDT) . Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sat, 28 Jun 2003 12:37:10 +0300 From: Danny Braniss Message-Id: Subject: Re: USB, select/poll for ucom X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 Jun 2003 09:37:13 -0000 [...] > have fun. the mindshare book is good. however, it took me a long > time to get a usb 'aha' moment and understand its twisty maze was > really a workable design obscured by standardese... I suspect it is a > problem in the usb chipset driver for the com part. ttypoll just says > 'you have data in the buffer' so for some reason the data isn't making > into the tty buffer. > > Warner Im amazed at how some of you can write a driver based on the Spec. Docs! here is a pearl i came across reading the USB spec for 1.1, page 43 'The maximum allowable interrupt data payload size is 64 bytes or less for full-speed.' danny