Simon Ford
ID12RFID library, quickly modified to use interrupt driven reception instead so it doesn\'t block
Dependents: m3pi_WiiRacing m3pi_RFIDReader
ID12RFID.cpp@0:a740ea2424e5, 2011-04-11 (annotated)
- Committer:
- simon
- Date:
- Mon Apr 11 23:02:00 2011 +0000
- Revision:
- 0:a740ea2424e5
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| simon | 0:a740ea2424e5 | 1 | /* mbed ID12 RFID Library |
| simon | 0:a740ea2424e5 | 2 | * Copyright (c) 2007-2011, sford, http://mbed.org |
| simon | 0:a740ea2424e5 | 3 | * |
| simon | 0:a740ea2424e5 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| simon | 0:a740ea2424e5 | 5 | * of this software and associated documentation files (the "Software"), to deal |
| simon | 0:a740ea2424e5 | 6 | * in the Software without restriction, including without limitation the rights |
| simon | 0:a740ea2424e5 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| simon | 0:a740ea2424e5 | 8 | * copies of the Software, and to permit persons to whom the Software is |
| simon | 0:a740ea2424e5 | 9 | * furnished to do so, subject to the following conditions: |
| simon | 0:a740ea2424e5 | 10 | * |
| simon | 0:a740ea2424e5 | 11 | * The above copyright notice and this permission notice shall be included in |
| simon | 0:a740ea2424e5 | 12 | * all copies or substantial portions of the Software. |
| simon | 0:a740ea2424e5 | 13 | * |
| simon | 0:a740ea2424e5 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| simon | 0:a740ea2424e5 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| simon | 0:a740ea2424e5 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| simon | 0:a740ea2424e5 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| simon | 0:a740ea2424e5 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| simon | 0:a740ea2424e5 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| simon | 0:a740ea2424e5 | 20 | * THE SOFTWARE. |
| simon | 0:a740ea2424e5 | 21 | */ |
| simon | 0:a740ea2424e5 | 22 | |
| simon | 0:a740ea2424e5 | 23 | // modified to use interrupts |
| simon | 0:a740ea2424e5 | 24 | |
| simon | 0:a740ea2424e5 | 25 | #include "ID12RFID.h" |
| simon | 0:a740ea2424e5 | 26 | |
| simon | 0:a740ea2424e5 | 27 | #include "mbed.h" |
| simon | 0:a740ea2424e5 | 28 | |
| simon | 0:a740ea2424e5 | 29 | ID12RFID::ID12RFID(PinName rx) |
| simon | 0:a740ea2424e5 | 30 | : _rfid(NC, rx) { |
| simon | 0:a740ea2424e5 | 31 | nbuffer = 0; |
| simon | 0:a740ea2424e5 | 32 | last = 0; |
| simon | 0:a740ea2424e5 | 33 | _rfid.attach(this, &ID12RFID::handler); |
| simon | 0:a740ea2424e5 | 34 | } |
| simon | 0:a740ea2424e5 | 35 | |
| simon | 0:a740ea2424e5 | 36 | void ID12RFID::handler() { |
| simon | 0:a740ea2424e5 | 37 | buffer[nbuffer] = _rfid.getc(); |
| simon | 0:a740ea2424e5 | 38 | if(buffer == 0) { // waiting for '2' |
| simon | 0:a740ea2424e5 | 39 | if(buffer[nbuffer] != 2) { // is not '2' |
| simon | 0:a740ea2424e5 | 40 | return; // so ignore |
| simon | 0:a740ea2424e5 | 41 | } |
| simon | 0:a740ea2424e5 | 42 | } |
| simon | 0:a740ea2424e5 | 43 | nbuffer++; |
| simon | 0:a740ea2424e5 | 44 | |
| simon | 0:a740ea2424e5 | 45 | // 2 x x 8 chars x x x x |
| simon | 0:a740ea2424e5 | 46 | if(nbuffer > 15) { |
| simon | 0:a740ea2424e5 | 47 | last = 0; |
| simon | 0:a740ea2424e5 | 48 | for(int i=7; i>=0; i--) { |
| simon | 0:a740ea2424e5 | 49 | char c = buffer[10 - i]; // a ascii hex char |
| simon | 0:a740ea2424e5 | 50 | int part = c - '0'; |
| simon | 0:a740ea2424e5 | 51 | last |= part << (i * 4); |
| simon | 0:a740ea2424e5 | 52 | } |
| simon | 0:a740ea2424e5 | 53 | nbuffer = 0; |
| simon | 0:a740ea2424e5 | 54 | } |
| simon | 0:a740ea2424e5 | 55 | } |
| simon | 0:a740ea2424e5 | 56 | |
| simon | 0:a740ea2424e5 | 57 | int ID12RFID::readable() { |
| simon | 0:a740ea2424e5 | 58 | return (last > 0); //_rfid.readable(); |
| simon | 0:a740ea2424e5 | 59 | } |
| simon | 0:a740ea2424e5 | 60 | |
| simon | 0:a740ea2424e5 | 61 | int ID12RFID::read() { |
| simon | 0:a740ea2424e5 | 62 | int t = last; |
| simon | 0:a740ea2424e5 | 63 | last = 0; |
| simon | 0:a740ea2424e5 | 64 | return t; |
| simon | 0:a740ea2424e5 | 65 | } |