Add: hf thinfilm info - support to read and decode Kovio Thinfilm NCT tags

armsrc/thinfilm.c

@@ -0,0 +1,47 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2019 iceman
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Routines to support a mangeled ISO 14443 type A for Thinfilm tags by Kovio
+//-----------------------------------------------------------------------------
+
+#include "thinfilm.h"
+
+/**
+  * ref
+  *   https://www.thinfilmnfc.com/wp-content/uploads/2017/09/Thinfilm-Kovio-NFC-Barcode-Protocol-Tag-Functional-Specification-v3.4-2017-05-26.pdf
+  *   https://developer.android.com/reference/android/nfc/tech/NfcBarcode
+  *  
+  */
+
+void ReadThinFilm(void) {
+    
+    clear_trace();
+
+    set_tracing(true);
+
+    iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
+
+    uint8_t len = 0;
+    uint8_t buf[36] = {0x00};
+
+    // power on and listen for answer.
+    bool status = GetIso14443aAnswerFromTag_Thinfilm(buf, &len);
+
+    // lsb -> msb
+    for (uint8_t i = 0; i < len; i++) {
+        uint8_t b = buf[i];
+        buf[i] = ((b * 0x0802LU & 0x22110LU) | (b * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16; 
+    }
+    // Startbit is always set and used in byte
+    buf[0] |= 0x80;
+        
+    reply_ng(CMD_THINFILM_READ, status ? PM3_SUCCESS : PM3_ENODATA, buf, len);
+
+    iso14443a_off();
+    set_tracing(false);
+}
+