emulatetag.h

00001 /**************************************************************************/
00002 /*!
00003     @file     emulatetag.h
00004     @author   Armin Wieser
00005     @license  BSD
00006 
00007     Implemented using NFC forum documents & library of libnfc
00008 */
00009 /**************************************************************************/
00010 
00011 #ifndef __EMULATETAG_H__
00012 #define __EMULATETAG_H__
00013 
00014 #include "PN532.h "
00015 
00016 #define NDEF_MAX_LENGTH 128  // altough ndef can handle up to 0xfffe in size, arduino cannot.
00017 typedef enum {COMMAND_COMPLETE, TAG_NOT_FOUND, FUNCTION_NOT_SUPPORTED, MEMORY_FAILURE, END_OF_FILE_BEFORE_REACHED_LE_BYTES} responseCommand;
00018 
00019 class EmulateTag{
00020 
00021 public:
00022 EmulateTag(PN532Interface &interface) : pn532(interface), uidPtr(0), tagWrittenByInitiator(false), tagWriteable(true), updateNdefCallback(0) { }
00023   
00024   bool init();
00025 
00026   bool emulate(const uint16_t tgInitAsTargetTimeout = 0);
00027 
00028   /*
00029    * @param uid pointer to byte array of length 3 (uid is 4 bytes - first byte is fixed) or zero for uid 
00030    */
00031   void setUid(uint8_t* uid = 0);
00032 
00033   void setNdefFile(const uint8_t* ndef, const int16_t ndefLength);
00034 
00035   void getContent(uint8_t** buf, uint16_t* length){
00036     *buf = ndef_file + 2; // first 2 bytes = length
00037     *length = (ndef_file[0] << 8) + ndef_file[1];
00038   }
00039 
00040   bool writeOccured(){
00041     return tagWrittenByInitiator;
00042   }
00043 
00044   void setTagWriteable(bool setWriteable){
00045     tagWriteable = setWriteable;
00046   }
00047 
00048   uint8_t* getNdefFilePtr(){
00049     return ndef_file;
00050   }
00051 
00052   uint8_t getNdefMaxLength(){
00053     return NDEF_MAX_LENGTH;
00054   }
00055 
00056   void attach(void (*func)(uint8_t *buf, uint16_t length)) {
00057     updateNdefCallback = func;
00058   };
00059 
00060 private:
00061   PN532 pn532;
00062   uint8_t ndef_file[NDEF_MAX_LENGTH];
00063   uint8_t* uidPtr;
00064   bool tagWrittenByInitiator;
00065   bool tagWriteable;
00066   void (*updateNdefCallback)(uint8_t *ndef, uint16_t length);
00067 
00068   void setResponse(responseCommand cmd, uint8_t* buf, uint8_t* sendlen, uint8_t sendlenOffset = 0);
00069 };
00070 
00071 #endif