ID12RFID.cpp

00001 /* mbed ID12 RFID Library
00002  * Copyright (c) 2007-2010, sford, http://mbed.org
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020  * THE SOFTWARE.
00021  */
00022 
00023 #include "ID12RFID.h"
00024 
00025 #include "mbed.h"
00026 
00027 ID12RFID::ID12RFID(PinName rx)
00028         : _rfid(NC, rx) {
00029 }
00030 
00031 int ID12RFID::readable() {
00032     return _rfid.readable();
00033 }
00034 
00035 int ID12RFID::read() {
00036     while (_rfid.getc() != 2);
00037 
00038     int v = 0;
00039     _rfid.getc(); // drop 1st 2 bytes - we actually only read the lower 32-bits of the code
00040     _rfid.getc();
00041 
00042     for (int i=7; i>=0; i--) {
00043         char c = _rfid.getc(); // a ascii hex char
00044         int part = c - '0';
00045         v |= part << (i * 4);
00046     }
00047     
00048     for (int i=0; i<5; i++) {
00049         _rfid.getc();
00050     }
00051     
00052     return v;
00053 }
00054 
00055 void ID12RFID::setInterrupt(void (*fptr)()) {
00056     _rfid.attach(fptr);
00057 }