Documentation

brmdoor_nfc.h

@@ -7,53 +7,103 @@
 #include <nfc/nfc.h>
 #include <nfc/nfc-types.h>
 
+/** 
+ * Exception class for reader related errors. 
+ */
 class NFCError: public std::exception
 {
 
 public:
 
+    /** Constructor with human-readable reason message */
     NFCError(const std::string& msg);
     
+    /** Returns reason why this was thrown. */
     const char *what() const throw() {return _msg.c_str();}
 
     ~NFCError() throw() {}
 
 protected:
 
+    /** Reason message */
     std::string _msg;
 };
 
+/**
+ * Represents one PN532 reader device. Config is taken from default
+ * libnfc-specified location. That usually means first device found is used.
+ *
+ * Config resides in /etc/nfc/libnfc.conf if installed from packages or
+ * /usr/local/etc/nfc/libnfc.conf if installed from source.
+ *
+ * A device is specified like this:
+ *
+ * device.connstring = pn532_uart:/dev/ttyACM0
+ * device.connstring = "pn532_spi:/dev/spidev0.0"
+ *
+ * Refer to libnfc documentation for setting up devices.
+ */
 class NFCDevice
 {
 
 public:
     
+    /** 
+     * Initializes PN53x libnfc device and opens it, so you don't need to call
+     * open() after constructor.
+     *
+     * @throws NFCError if no device found or communication failed
+     */
     NFCDevice() throw(NFCError);
     
+    /** Destructor frees internal libnfc structures */
     virtual ~NFCDevice();
 
+    /** 
+     * Poll until a ISO14443A card is in the field and returns its UID.
+     * 
+     * @returns binary string containing UID or empty if non-supported card
+     *          present in reader field
+     * @throws NFCError if polling failed
+     */
     std::string scanUID() throw(NFCError);
 
+    /** Open device explicitly. May be useful after explicit close */
     void open() throw(NFCError);
 
+    /** Returns true iff device was opened */
     bool opened() const {return _opened;}
 
+    /** Close reader. You need to reopen before reading again */
     void close();
 
+    /** 
+     * Specifies the number of polling (0x01 – 0xFE: 1 up to 254 polling, 0xFF:
+     * Endless polling)
+     */
     uint8_t pollNr;
 
+    /** 
+     * Polling period when waiting for card in multiples of 150 ms.
+     * (0x01 – 0x0F: 150ms – 2.25s)
+     */
     uint8_t pollPeriod;
 
 protected:
 
+    /** Modulations that specify cards accepted by reader */
     static const nfc_modulation _modulations[5];    
 
+    /** Number of modulations in _modulations array */
     static const size_t _modulationsLen = 5;
 
+    /** libnfc-specific opaque context */
     nfc_context *_nfcContext;
 
+    /** Device opened by libnfc functions, may be NULL */
     nfc_device *_nfcDevice;
 
+    /** Whether device has been successfully opened */
     bool _opened;
 
 };