added arduino nfcReader files (#42)

Arduino/nfcReader/PN532/PN532Interface.h

@@ -0,0 +1,56 @@
+
+
+#ifndef __PN532_INTERFACE_H__
+#define __PN532_INTERFACE_H__
+
+#include <stdint.h>
+
+#define PN532_PREAMBLE                (0x00)
+#define PN532_STARTCODE1              (0x00)
+#define PN532_STARTCODE2              (0xFF)
+#define PN532_POSTAMBLE               (0x00)
+
+#define PN532_HOSTTOPN532             (0xD4)
+#define PN532_PN532TOHOST             (0xD5)
+
+#define PN532_ACK_WAIT_TIME           (10)  // ms, timeout of waiting for ACK
+
+#define PN532_INVALID_ACK             (-1)
+#define PN532_TIMEOUT                 (-2)
+#define PN532_INVALID_FRAME           (-3)
+#define PN532_NO_SPACE                (-4)
+
+#define REVERSE_BITS_ORDER(b)         b = (b & 0xF0) >> 4 | (b & 0x0F) << 4; \
+                                      b = (b & 0xCC) >> 2 | (b & 0x33) << 2; \
+                                      b = (b & 0xAA) >> 1 | (b & 0x55) << 1
+
+class PN532Interface
+{
+public:
+    virtual void begin() = 0;
+    virtual void wakeup() = 0;
+
+    /**
+    * @brief    write a command and check ack
+    * @param    header  packet header
+    * @param    hlen    length of header
+    * @param    body    packet body
+    * @param    blen    length of body
+    * @return   0       success
+    *           not 0   failed
+    */
+    virtual int8_t writeCommand(const uint8_t *header, uint8_t hlen, const uint8_t *body = 0, uint8_t blen = 0) = 0;
+
+    /**
+    * @brief    read the response of a command, strip prefix and suffix
+    * @param    buf     to contain the response data
+    * @param    len     lenght to read
+    * @param    timeout max time to wait, 0 means no timeout
+    * @return   >=0     length of response without prefix and suffix
+    *           <0      failed to read response
+    */
+    virtual int16_t readResponse(uint8_t buf[], uint8_t len, uint16_t timeout = 1000) = 0;
+};
+
+#endif
+