added arduino nfcReader files (#42)

Arduino/nfcReader/PN532/mac_link.h

@@ -0,0 +1,51 @@
+
+
+#ifndef __MAC_LINK_H__
+#define __MAC_LINK_H__
+
+#include "PN532.h"
+
+class MACLink {
+public:
+    MACLink(PN532Interface &interface) : pn532(interface) {
+
+    };
+    
+    /**
+    * @brief    Activate PN532 as a target
+    * @param    timeout max time to wait, 0 means no timeout
+    * @return   > 0     success
+    *           = 0     timeout
+    *           < 0     failed
+    */
+    int8_t activateAsTarget(uint16_t timeout = 0);
+
+    /**
+    * @brief    write a PDU packet, the packet should be less than (255 - 2) bytes
+    * @param    header  packet header
+    * @param    hlen    length of header
+    * @param 	body	packet body
+    * @param 	blen	length of body
+    * @return   true    success
+    *           false   failed
+    */
+    bool write(const uint8_t *header, uint8_t hlen, const uint8_t *body = 0, uint8_t blen = 0);
+
+    /**
+    * @brief    read a PDU packet, the packet will be less than (255 - 2) bytes
+    * @param    buf     the buffer to contain the PDU packet
+    * @param    len     lenght of the buffer
+    * @return   >=0     length of the PDU packet 
+    *           <0      failed
+    */
+    int16_t read(uint8_t *buf, uint8_t len);
+
+    uint8_t *getHeaderBuffer(uint8_t *len) {
+        return pn532.getBuffer(len);
+    };
+    
+private:
+    PN532 pn532;
+};
+
+#endif // __MAC_LINK_H__