tim008 tim008 / Mbed 2 deprecated WiegandRFID

Nedim Hozić Mesud Klisura

Dependencies:   mbed

Fork of Wiegand by Paul van der Wielen

wiegand.h@0:033aa4854957, 2011-02-03 (annotated)

Committer:
pwheels
Date:
Thu Feb 03 18:48:04 2011 +0000
Revision:
0:033aa4854957
Child:
1:024f831fa51e
Initial creation date 3-feb-2011

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pwheels 0:033aa4854957 1 /*
pwheels 0:033aa4854957 2 * Copyright (c) 2011 Paul van der Wielen, Pro-Serv
pwheels 0:033aa4854957 3 *
pwheels 0:033aa4854957 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
pwheels 0:033aa4854957 5 * of this software and associated documentation files (the "Software"), to use
pwheels 0:033aa4854957 6 * and implement the software for none commercial reason and usage only and
pwheels 0:033aa4854957 7 * subject to the following conditions:
pwheels 0:033aa4854957 8 *
pwheels 0:033aa4854957 9 * The above copyright notice and this permission notice shall be included in
pwheels 0:033aa4854957 10 * all copies or substantial portions of the Software.
pwheels 0:033aa4854957 11 *
pwheels 0:033aa4854957 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
pwheels 0:033aa4854957 13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
pwheels 0:033aa4854957 14 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
pwheels 0:033aa4854957 15 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
pwheels 0:033aa4854957 16 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
pwheels 0:033aa4854957 17 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
pwheels 0:033aa4854957 18 * THE SOFTWARE.
pwheels 0:033aa4854957 19 *
pwheels 0:033aa4854957 20 * Usage and assumptions:
pwheels 0:033aa4854957 21 * a RFID reader Model MF7(1.05) is configured in wiegand mode and attached
pwheels 0:033aa4854957 22 * ports per call to class (could be to p5 & p6 via a level converter as to
pwheels 0:033aa4854957 23 * isolate the 5V source voltage from the 3.3V needed by MCU, this can easily
pwheels 0:033aa4854957 24 * be done with diode in series with signal data0 and data1 of RFID reader and
pwheels 0:033aa4854957 25 * pull up on MCU side.
pwheels 0:033aa4854957 26 *
pwheels 0:033aa4854957 27 * Note: using 'Wiegand' format rfid reader has one drawback as it only is capable
pwheels 0:033aa4854957 28 * of returning 6 digits out of the 8 digits of the full RFID code, which is
pwheels 0:033aa4854957 29 * the case for an 1K MiFare card.
pwheels 0:033aa4854957 30 * Benefit is that a lot of Wiegand compatible reader do exist from various
pwheels 0:033aa4854957 31 * brands at an reasonable price.
pwheels 0:033aa4854957 32 */
pwheels 0:033aa4854957 33
pwheels 0:033aa4854957 34 #include "mbed.h"
pwheels 0:033aa4854957 35
pwheels 0:033aa4854957 36 class Wiegand {
pwheels 0:033aa4854957 37 public:
pwheels 0:033aa4854957 38 Wiegand(PinName pin0, PinName pin1) : _D0(pin0), _D1(pin1) { // create the InterruptIn on the pin specified to Wiegand
pwheels 0:033aa4854957 39 _D0.mode(PullUp);
pwheels 0:033aa4854957 40 _D1.mode(PullUp);
pwheels 0:033aa4854957 41 _D0.rise(this, &Wiegand::data_0); // attach data_0 function of this wiegand instance
pwheels 0:033aa4854957 42 _D1.rise(this, &Wiegand::data_1); // attach data_1 function of this wiegand instance
pwheels 0:033aa4854957 43 }
pwheels 0:033aa4854957 44
pwheels 0:033aa4854957 45 /*
pwheels 0:033aa4854957 46 * Interrupt driven signal from data0 data line
pwheels 0:033aa4854957 47 */
pwheels 0:033aa4854957 48 void data_0() {
pwheels 0:033aa4854957 49 if (_pulses == 26) {
pwheels 0:033aa4854957 50 clear();
pwheels 0:033aa4854957 51 }
pwheels 0:033aa4854957 52 _wiegand = ((_wiegand << 1) & 0x3ffffff) + 0x00;
pwheels 0:033aa4854957 53 if (_pulses < 13) {
pwheels 0:033aa4854957 54 _e_par = (_e_par & 0x01);
pwheels 0:033aa4854957 55 } else {
pwheels 0:033aa4854957 56 _e_par = (_e_par & 0x01);
pwheels 0:033aa4854957 57 }
pwheels 0:033aa4854957 58 _pulses++;
pwheels 0:033aa4854957 59 }
pwheels 0:033aa4854957 60
pwheels 0:033aa4854957 61 /*
pwheels 0:033aa4854957 62 * Interrupt driven signal from data1 data line
pwheels 0:033aa4854957 63 */
pwheels 0:033aa4854957 64 void data_1() {
pwheels 0:033aa4854957 65 if (_pulses == 26) {
pwheels 0:033aa4854957 66 clear();
pwheels 0:033aa4854957 67 }
pwheels 0:033aa4854957 68 _wiegand = ((_wiegand << 1) & 0x3ffffff) + 0x01;
pwheels 0:033aa4854957 69 if (_pulses < 13) {
pwheels 0:033aa4854957 70 _o_par = (_o_par & 0x01) + 0x01;
pwheels 0:033aa4854957 71 } else {
pwheels 0:033aa4854957 72 _o_par = (_o_par & 0x01) + 0x01;
pwheels 0:033aa4854957 73 }
pwheels 0:033aa4854957 74 _pulses++;
pwheels 0:033aa4854957 75 }
pwheels 0:033aa4854957 76
pwheels 0:033aa4854957 77 /*
pwheels 0:033aa4854957 78 * Various callable class members as to obtain data parts
pwheels 0:033aa4854957 79 */
pwheels 0:033aa4854957 80 unsigned long site() {
pwheels 0:033aa4854957 81 return (_wiegand >> 17) & 0xff;
pwheels 0:033aa4854957 82 }
pwheels 0:033aa4854957 83
pwheels 0:033aa4854957 84 unsigned long data() {
pwheels 0:033aa4854957 85 return (_wiegand >> 1) & 0xffff;
pwheels 0:033aa4854957 86 }
pwheels 0:033aa4854957 87
pwheels 0:033aa4854957 88 unsigned long rfid() {
pwheels 0:033aa4854957 89 return (_wiegand >> 1) & 0xffffff;
pwheels 0:033aa4854957 90 }
pwheels 0:033aa4854957 91
pwheels 0:033aa4854957 92 /*
pwheels 0:033aa4854957 93 * returns true if we have read all pulses and we have proper parity for both data halves
pwheels 0:033aa4854957 94 */
pwheels 0:033aa4854957 95 bool readable() {
pwheels 0:033aa4854957 96 if (( _pulses == 26) && (_e_par == 0) && (_o_par == 1)) {
pwheels 0:033aa4854957 97 return true;
pwheels 0:033aa4854957 98 } else {
pwheels 0:033aa4854957 99 return false;
pwheels 0:033aa4854957 100 }
pwheels 0:033aa4854957 101 }
pwheels 0:033aa4854957 102
pwheels 0:033aa4854957 103 /*
pwheels 0:033aa4854957 104 * clear last read card entry, prepare for next card entry
pwheels 0:033aa4854957 105 */
pwheels 0:033aa4854957 106 void clear() {
pwheels 0:033aa4854957 107 _pulses = _e_par = _o_par = 0;
pwheels 0:033aa4854957 108 _wiegand = 0;
pwheels 0:033aa4854957 109 }
pwheels 0:033aa4854957 110
pwheels 0:033aa4854957 111 private:
pwheels 0:033aa4854957 112 InterruptIn _D0;
pwheels 0:033aa4854957 113 InterruptIn _D1;
pwheels 0:033aa4854957 114 volatile unsigned long _wiegand;
pwheels 0:033aa4854957 115 volatile unsigned int _pulses;
pwheels 0:033aa4854957 116 volatile unsigned int _e_par;
pwheels 0:033aa4854957 117 volatile unsigned int _o_par;
pwheels 0:033aa4854957 118 };