tim008 tim008 / Mbed 2 deprecated WiegandRFID

Nedim Hozić Mesud Klisura

Dependencies:   mbed

Fork of Wiegand by Paul van der Wielen

wiegand.h@1:024f831fa51e, 2014-01-19 (annotated)

Committer:
pwheels
Date:
Sun Jan 19 14:19:09 2014 +0000
Revision:
1:024f831fa51e
Parent:
0:033aa4854957 
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Who changed what in which revision?

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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 1:024f831fa51e 35 #define W_PULSES 26
pwheels 0:033aa4854957 36
pwheels 0:033aa4854957 37 class Wiegand {
pwheels 0:033aa4854957 38 public:
pwheels 0:033aa4854957 39 Wiegand(PinName pin0, PinName pin1) : _D0(pin0), _D1(pin1) { // create the InterruptIn on the pin specified to Wiegand
pwheels 0:033aa4854957 40 _D0.mode(PullUp);
pwheels 0:033aa4854957 41 _D1.mode(PullUp);
pwheels 0:033aa4854957 42 _D0.rise(this, &Wiegand::data_0); // attach data_0 function of this wiegand instance
pwheels 0:033aa4854957 43 _D1.rise(this, &Wiegand::data_1); // attach data_1 function of this wiegand instance
pwheels 0:033aa4854957 44 }
pwheels 0:033aa4854957 45
pwheels 0:033aa4854957 46 /*
pwheels 0:033aa4854957 47 * Interrupt driven signal from data0 data line
pwheels 0:033aa4854957 48 */
pwheels 0:033aa4854957 49 void data_0() {
pwheels 1:024f831fa51e 50 if (_pulses == W_PULSES) {
pwheels 0:033aa4854957 51 clear();
pwheels 0:033aa4854957 52 }
pwheels 0:033aa4854957 53 _wiegand = ((_wiegand << 1) & 0x3ffffff) + 0x00;
pwheels 1:024f831fa51e 54 if (_pulses < W_PULSES / 2) {
pwheels 0:033aa4854957 55 _e_par = (_e_par & 0x01);
pwheels 0:033aa4854957 56 } else {
pwheels 0:033aa4854957 57 _e_par = (_e_par & 0x01);
pwheels 0:033aa4854957 58 }
pwheels 0:033aa4854957 59 _pulses++;
pwheels 0:033aa4854957 60 }
pwheels 0:033aa4854957 61
pwheels 0:033aa4854957 62 /*
pwheels 0:033aa4854957 63 * Interrupt driven signal from data1 data line
pwheels 0:033aa4854957 64 */
pwheels 0:033aa4854957 65 void data_1() {
pwheels 1:024f831fa51e 66 if (_pulses == W_PULSES) {
pwheels 0:033aa4854957 67 clear();
pwheels 0:033aa4854957 68 }
pwheels 0:033aa4854957 69 _wiegand = ((_wiegand << 1) & 0x3ffffff) + 0x01;
pwheels 1:024f831fa51e 70 if (_pulses < W_PULSES / 2) {
pwheels 0:033aa4854957 71 _o_par = (_o_par & 0x01) + 0x01;
pwheels 0:033aa4854957 72 } else {
pwheels 0:033aa4854957 73 _o_par = (_o_par & 0x01) + 0x01;
pwheels 0:033aa4854957 74 }
pwheels 0:033aa4854957 75 _pulses++;
pwheels 0:033aa4854957 76 }
pwheels 0:033aa4854957 77
pwheels 0:033aa4854957 78 /*
pwheels 0:033aa4854957 79 * Various callable class members as to obtain data parts
pwheels 0:033aa4854957 80 */
pwheels 0:033aa4854957 81 unsigned long site() {
pwheels 0:033aa4854957 82 return (_wiegand >> 17) & 0xff;
pwheels 0:033aa4854957 83 }
pwheels 0:033aa4854957 84
pwheels 0:033aa4854957 85 unsigned long data() {
pwheels 0:033aa4854957 86 return (_wiegand >> 1) & 0xffff;
pwheels 0:033aa4854957 87 }
pwheels 0:033aa4854957 88
pwheels 0:033aa4854957 89 unsigned long rfid() {
pwheels 0:033aa4854957 90 return (_wiegand >> 1) & 0xffffff;
pwheels 0:033aa4854957 91 }
pwheels 0:033aa4854957 92
pwheels 0:033aa4854957 93 /*
pwheels 0:033aa4854957 94 * returns true if we have read all pulses and we have proper parity for both data halves
pwheels 0:033aa4854957 95 */
pwheels 0:033aa4854957 96 bool readable() {
pwheels 1:024f831fa51e 97 if (( _pulses == W_PULSES) && (_e_par == 0) && (_o_par == 1)) {
pwheels 0:033aa4854957 98 return true;
pwheels 0:033aa4854957 99 } else {
pwheels 0:033aa4854957 100 return false;
pwheels 0:033aa4854957 101 }
pwheels 0:033aa4854957 102 }
pwheels 0:033aa4854957 103
pwheels 0:033aa4854957 104 /*
pwheels 0:033aa4854957 105 * clear last read card entry, prepare for next card entry
pwheels 0:033aa4854957 106 */
pwheels 0:033aa4854957 107 void clear() {
pwheels 0:033aa4854957 108 _pulses = _e_par = _o_par = 0;
pwheels 0:033aa4854957 109 _wiegand = 0;
pwheels 0:033aa4854957 110 }
pwheels 0:033aa4854957 111
pwheels 0:033aa4854957 112 private:
pwheels 0:033aa4854957 113 InterruptIn _D0;
pwheels 0:033aa4854957 114 InterruptIn _D1;
pwheels 0:033aa4854957 115 volatile unsigned long _wiegand;
pwheels 0:033aa4854957 116 volatile unsigned int _pulses;
pwheels 0:033aa4854957 117 volatile unsigned int _e_par;
pwheels 0:033aa4854957 118 volatile unsigned int _o_par;
pwheels 0:033aa4854957 119 };