Diff: main.cpp

Revision:

0:54bf4b21c7fa

Child:

1:fb72a2f7cab5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Sep 19 05:04:15 2014 +0000
@@ -0,0 +1,201 @@
+// readMifare code adapted from Adafruit-PN532 library.
+// see: https://github.com/adafruit/Adafruit-PN532
+//
+// Original Author : Adafruit Industries
+// Modified By     : Ben Zhang <benzh@eecs.berkeley.edu>
+// Date            : 2014/09/17
+
+/**************************************************************************/
+/*! 
+    This example will wait for any ISO14443A card or tag, and
+    depending on the size of the UID will attempt to read from it.
+   
+    If the card has a 4-byte UID it is probably a Mifare
+    Classic card, and the following steps are taken:
+   
+    - Authenticate block 4 (the first block of Sector 1) using
+      the default KEYA of 0XFF 0XFF 0XFF 0XFF 0XFF 0XFF
+    - If authentication succeeds, we can then read any of the
+      4 blocks in that sector (though only block 4 is read here)
+     
+    If the card has a 7-byte UID it is probably a Mifare
+    Ultralight card, and the 4 byte pages can be read directly.
+    Page 4 is read by default since this is the first 'general-
+    purpose' page on the tags.
+
+
+This is an example sketch for the Adafruit PN532 NFC/RFID breakout boards
+This library works with the Adafruit NFC breakout 
+  ----> https://www.adafruit.com/products/364
+ 
+Check out the links above for our tutorials and wiring diagrams 
+These chips use SPI to communicate, 4 required to interface
+
+Adafruit invests time and resources providing this open source code, 
+please support Adafruit and open-source hardware by purchasing 
+products from Adafruit!
+
+*/
+/**************************************************************************/
+
+#include "mbed.h"
+#include "Adafruit_PN532.h"
+
+#define SS   PTD0
+// PTD1 is also LED_BLUE
+#define SCK  PTD1
+#define MOSI PTD2
+#define MISO PTD3
+
+DigitalOut red(LED_RED);
+DigitalOut green(LED_GREEN);
+
+Serial pc(USBTX, USBRX);
+Adafruit_PN532 nfc(SCK, MISO, MOSI, SS);
+
+void loop(void);
+
+int main() {
+  pc.printf("Hello!\n");  
+  // By default, red
+  green = 1; red = 0;
+
+  
+  nfc.begin();
+
+  uint32_t versiondata = nfc.getFirmwareVersion();
+  if (! versiondata) {
+    pc.printf("Didn't find PN53x board");
+    while (1); // halt
+  }
+  // Got ok data, print it out!
+  pc.printf("Found chip PN5%2X with Firmware ver. %d.%d\n",
+            versiondata >> 24,
+            (versiondata >> 16) & 0xFF,
+            (versiondata >> 8) & 0xFF);
+  
+  // configure board to read RFID tags
+  nfc.SAMConfig();
+  
+  pc.printf("Waiting for an ISO14443A Card ...\n");
+  
+  while(1) { loop(); }
+}
+
+
+void loop(void) {
+  // Turn back to red  
+  green = 1; red = 0;
+
+  uint8_t success;
+  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };  // Buffer to store the returned UID
+  uint8_t uidLength;                        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)
+  
+  // Wait for an ISO14443A type cards (Mifare, etc.).  When one is found
+  // 'uid' will be populated with the UID, and uidLength will indicate
+  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
+  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
+  
+  if (success) {
+    // Turn off to indicate Card swipe
+    green = 1; red = 1;
+    // Display some basic information about the card
+    pc.printf("\n\nFound an ISO14443A card\n");
+    pc.printf("  UID Length: %d bytes", uidLength);
+    pc.printf("  UID Value: ");
+    nfc.PrintHex(uid, uidLength);
+    pc.printf("\n");
+    
+    if (uidLength == 4)
+    {
+      // We probably have a Mifare Classic card ... 
+      pc.printf("Seems to be a Mifare Classic card (4 byte UID)\n");
+      
+      // Now we need to try to authenticate it for read/write access
+      // Try with the factory default KeyA: 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
+      pc.printf("Trying to authenticate block 4 with default KEYA value\n");
+      uint8_t keya[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
+      
+      // Start with block 4 (the first block of sector 1) since sector 0
+      // contains the manufacturer data and it's probably better just
+      // to leave it alone unless you know what you're doing
+      success = nfc.mifareclassic_AuthenticateBlock(uid, uidLength, 4, 0, keya);
+      
+      if (success)
+      {
+        // Turn green to indicate success
+        green = 0; red = 1;
+        pc.printf("Sector 1 (Blocks 4..7) has been authenticated\n");
+        uint8_t data[16];
+        
+        // If you want to write something to block 4 to test with, remove
+        // the definition of data above, and uncomment the following lines
+        /************************************************************************
+        uint8_t data[16] = { 'b', 'e', 'n', ' ', 'z', 'h', 'a', 'n', 'g' };
+        success = nfc.mifareclassic_WriteDataBlock (4, data);
+        if (success)
+        {
+          // Data seems to have been read ... spit it out
+          pc.printf("Data Written to Block 4:\n\t");
+          nfc.PrintHexChar(data, 16);
+          pc.printf("\n");
+          
+          // Wait a bit before reading the card again
+          wait(1);
+        }
+        else
+        {
+          pc.printf("Ooops ... unable to write the requested block.\n");
+        }
+        return;
+        ************************************************************************/
+        
+        // Try to read the contents of block 4
+        success = nfc.mifareclassic_ReadDataBlock(4, data);
+        
+        if (success)
+        {
+          // Data seems to have been read ... spit it out
+          pc.printf("Reading Block 4:\n\t");
+          nfc.PrintHexChar(data, 16);
+          pc.printf("\n");
+          
+          // Wait a bit before reading the card again
+          wait(1);
+        }
+        else
+        {
+          pc.printf("Ooops ... unable to read the requested block.  Try another key?\n");
+        }
+      }
+      else
+      {
+        pc.printf("Ooops ... authentication failed: Try another key?\n");
+      }
+    }
+    
+    if (uidLength == 7)
+    {
+      // We probably have a Mifare Ultralight card ...
+      pc.printf("Seems to be a Mifare Ultralight tag (7 byte UID)\n");
+      
+      // Try to read the first general-purpose user page (#4)
+      pc.printf("Reading page 4\n");
+      uint8_t data[32];
+      success = nfc.mifareultralight_ReadPage (4, data);
+      if (success)
+      {
+        // Data seems to have been read ... spit it out
+        nfc.PrintHexChar(data, 4);
+        pc.printf("\n");
+        
+        // Wait a bit before reading the card again
+        wait(1);
+      }
+      else
+      {
+        pc.printf("Ooops ... unable to read the requested page!?\n");
+      }
+    }
+  }
+}
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