firmware/export/ds2411.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Michael Sevakis
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #ifndef _DS2411_H_
  21 #define _DS2411_H_
  22
  23 #include <stdbool.h>
  24
  25 /*
  26  * Byte 0:    8-bit family code (always 01h)
  27  * Bytes 1-6: 48-bit serial number
  28  * Byte 7:    8-bit CRC code
  29  */
  30 struct ds2411_id
  31 {
  32     unsigned char family_code;
  33     unsigned char uid[6];
  34     unsigned char crc;
  35 } __attribute__((packed));
  36
  37 extern int ds2411_read_id(struct ds2411_id *id);
  38
  39 /* return values */
  40 enum ds2411_id_return_codes
  41 {
  42     DS2411_NO_PRESENCE = -3,
  43     DS2411_INVALID_FAMILY_CODE,
  44     DS2411_INVALID_CRC,
  45     DS2411_OK = 0,
  46 };
  47
  48 #endif /* _DS2411_H_ */