ID12 RFID library for reading 125KHz RFID tags
Dependents: ID12RFID_HelloWorld MyFinalDerbot RFID_CatDoor TweetRFID ... more
ID12RFID.cpp@1:f04afa911cf5, 2010-11-23 (annotated)
- Committer:
- simon
- Date:
- Tue Nov 23 17:17:15 2010 +0000
- Revision:
- 1:f04afa911cf5
- Parent:
- 0:049d572aefe1
New revisin as a library
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
simon | 1:f04afa911cf5 | 1 | /* mbed ID12 RFID Library |
simon | 1:f04afa911cf5 | 2 | * Copyright (c) 2007-2010, sford, http://mbed.org |
simon | 1:f04afa911cf5 | 3 | * |
simon | 1:f04afa911cf5 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
simon | 1:f04afa911cf5 | 5 | * of this software and associated documentation files (the "Software"), to deal |
simon | 1:f04afa911cf5 | 6 | * in the Software without restriction, including without limitation the rights |
simon | 1:f04afa911cf5 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
simon | 1:f04afa911cf5 | 8 | * copies of the Software, and to permit persons to whom the Software is |
simon | 1:f04afa911cf5 | 9 | * furnished to do so, subject to the following conditions: |
simon | 1:f04afa911cf5 | 10 | * |
simon | 1:f04afa911cf5 | 11 | * The above copyright notice and this permission notice shall be included in |
simon | 1:f04afa911cf5 | 12 | * all copies or substantial portions of the Software. |
simon | 1:f04afa911cf5 | 13 | * |
simon | 1:f04afa911cf5 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
simon | 1:f04afa911cf5 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
simon | 1:f04afa911cf5 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
simon | 1:f04afa911cf5 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
simon | 1:f04afa911cf5 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
simon | 1:f04afa911cf5 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
simon | 1:f04afa911cf5 | 20 | * THE SOFTWARE. |
simon | 1:f04afa911cf5 | 21 | */ |
simon | 1:f04afa911cf5 | 22 | |
simon | 1:f04afa911cf5 | 23 | #include "ID12RFID.h" |
simon | 1:f04afa911cf5 | 24 | |
simon | 1:f04afa911cf5 | 25 | #include "mbed.h" |
simon | 1:f04afa911cf5 | 26 | |
simon | 1:f04afa911cf5 | 27 | ID12RFID::ID12RFID(PinName rx) |
simon | 1:f04afa911cf5 | 28 | : _rfid(NC, rx) { |
simon | 1:f04afa911cf5 | 29 | } |
simon | 1:f04afa911cf5 | 30 | |
simon | 1:f04afa911cf5 | 31 | int ID12RFID::readable() { |
simon | 1:f04afa911cf5 | 32 | return _rfid.readable(); |
simon | 1:f04afa911cf5 | 33 | } |
simon | 1:f04afa911cf5 | 34 | |
simon | 1:f04afa911cf5 | 35 | int ID12RFID::read() { |
simon | 1:f04afa911cf5 | 36 | while (_rfid.getc() != 2); |
simon | 1:f04afa911cf5 | 37 | |
simon | 1:f04afa911cf5 | 38 | int v = 0; |
simon | 1:f04afa911cf5 | 39 | _rfid.getc(); // drop 1st 2 bytes - we actually only read the lower 32-bits of the code |
simon | 1:f04afa911cf5 | 40 | _rfid.getc(); |
simon | 1:f04afa911cf5 | 41 | |
simon | 1:f04afa911cf5 | 42 | for (int i=7; i>=0; i--) { |
simon | 1:f04afa911cf5 | 43 | char c = _rfid.getc(); // a ascii hex char |
simon | 1:f04afa911cf5 | 44 | int part = c - '0'; |
simon | 1:f04afa911cf5 | 45 | v |= part << (i * 4); |
simon | 1:f04afa911cf5 | 46 | } |
simon | 1:f04afa911cf5 | 47 | |
simon | 1:f04afa911cf5 | 48 | for (int i=0; i<5; i++) { |
simon | 1:f04afa911cf5 | 49 | _rfid.getc(); |
simon | 1:f04afa911cf5 | 50 | } |
simon | 1:f04afa911cf5 | 51 | |
simon | 1:f04afa911cf5 | 52 | return v; |
simon | 1:f04afa911cf5 | 53 | } |