From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59267) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a2IWo-0004vH-1i for qemu-devel@nongnu.org; Fri, 27 Nov 2015 07:53:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a2IWk-0001jp-QL for qemu-devel@nongnu.org; Fri, 27 Nov 2015 07:53:29 -0500 Received: from mx1.redhat.com ([209.132.183.28]:52212) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a2IWk-0001jg-LF for qemu-devel@nongnu.org; Fri, 27 Nov 2015 07:53:26 -0500 References: <1664220.kcr3K9QWbf@dabox> <56582329.5040304@redhat.com> <9231947.7qKgf3ndKO@dabox> From: Paolo Bonzini Message-ID: <56585242.3050501@redhat.com> Date: Fri, 27 Nov 2015 13:53:22 +0100 MIME-Version: 1.0 In-Reply-To: <9231947.7qKgf3ndKO@dabox> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH RFC] i2c-tiny-usb List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Tim Sander Cc: qemu-devel@nongnu.org, Gerd Hoffmann On 27/11/2015 13:39, Tim Sander wrote: > > I have one more thing, i2cdetect looks like this: > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f > 10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f > 20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f > 30: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f > 40: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f > 50: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f > 60: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f > 70: 70 71 72 73 74 75 76 77 > > But i only have a device at 0x50 so most numbers should be "--". > I know that i just have to set the read length to zero, to archive that. > Currently i don't know how to determine if there is something registered on > the requested i2c address? If there is no slave at the requested address, i2c_start_transfer will return 1. Paolo