Diff: ID12RFID.cpp

Revision:

0:a740ea2424e5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ID12RFID.cpp	Mon Apr 11 23:02:00 2011 +0000
@@ -0,0 +1,65 @@
+/* mbed ID12 RFID Library
+ * Copyright (c) 2007-2011, sford, http://mbed.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// modified to use interrupts
+
+#include "ID12RFID.h"
+
+#include "mbed.h"
+
+ID12RFID::ID12RFID(PinName rx)
+        : _rfid(NC, rx) {
+        nbuffer = 0;
+        last = 0;
+        _rfid.attach(this, &ID12RFID::handler);
+}
+
+void ID12RFID::handler() {
+    buffer[nbuffer] = _rfid.getc();
+    if(buffer == 0) {               // waiting for '2'
+        if(buffer[nbuffer] != 2) {  // is not '2'
+            return;                 // so ignore
+        }
+    }
+    nbuffer++;
+    
+    // 2 x x 8 chars x x x x 
+    if(nbuffer > 15) {
+        last = 0;
+        for(int i=7; i>=0; i--) {
+            char c = buffer[10 - i]; // a ascii hex char
+            int part = c - '0';
+            last |= part << (i * 4);
+        }
+        nbuffer = 0;
+    }
+}
+
+int ID12RFID::readable() {
+    return (last > 0); //_rfid.readable();
+}
+
+int ID12RFID::read() {
+   int t = last;
+   last = 0;
+   return t;
+}