added arduino nfcReader files (#42)

Arduino/nfcReader/PN532/llcp.h

@@ -0,0 +1,75 @@
+
+#ifndef __LLCP_H__
+#define __LLCP_H__
+
+#include "mac_link.h"
+
+#define LLCP_DEFAULT_TIMEOUT  20000
+#define LLCP_DEFAULT_DSAP     0x04
+#define LLCP_DEFAULT_SSAP     0x20
+
+class LLCP {
+public:
+	LLCP(PN532Interface &interface) : link(interface) {
+        headerBuf = link.getHeaderBuffer(&headerBufLen);
+        ns = 0;
+        nr = 0;
+	};
+
+	/**
+    * @brief    Actiave PN532 as a target
+    * @param    timeout max time to wait, 0 means no timeout
+    * @return   > 0     success
+    *           = 0     timeout
+    *           < 0     failed
+    */
+	int8_t activate(uint16_t timeout = 0);
+
+    int8_t waitForConnection(uint16_t timeout = LLCP_DEFAULT_TIMEOUT);
+
+    int8_t waitForDisconnection(uint16_t timeout = LLCP_DEFAULT_TIMEOUT);
+
+    int8_t connect(uint16_t timeout = LLCP_DEFAULT_TIMEOUT);
+
+    int8_t disconnect(uint16_t timeout = LLCP_DEFAULT_TIMEOUT);
+
+	/**
+    * @brief    write a 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  packet, the packet will be less than (255 - 2) bytes
+    * @param    buf     the buffer to contain the packet
+    * @param    len     lenght of the buffer
+    * @return   >=0     length of the packet 
+    *           <0      failed
+    */
+    int16_t read(uint8_t *buf, uint8_t len);
+
+    uint8_t *getHeaderBuffer(uint8_t *len) {
+        uint8_t *buf = link.getHeaderBuffer(len);
+        len -= 3;       // I PDU header has 3 bytes
+        return buf;
+    };
+
+private:
+	MACLink link;
+    uint8_t mode;
+	uint8_t ssap;
+	uint8_t dsap;
+    uint8_t *headerBuf;
+    uint8_t headerBufLen;
+    uint8_t ns;         // Number of I PDU Sent
+    uint8_t nr;         // Number of I PDU Received
+
+	static uint8_t SYMM_PDU[2];
+};
+
+#endif // __LLCP_H__