Add new example Check PDOL

Examples/NFCopy-CheckPDOL/NFCopy-CheckPDOL.ino

@@ -0,0 +1,169 @@
+/**
+ * Example to read a Visa NFC card  
+ * 
+ * Authors: 
+ *        Salvador Mendoza - @Netxing - salmg.net
+ *        For Electronic Cats - electroniccats.com
+ * 
+ *  April 2020
+ * 
+ * This code is beerware; if you see me (or any other collaborator 
+ * member) at the local, and you've found our code helpful, 
+ * please buy us a round!
+ * Distributed as-is; no warranty is given.
+ */
+
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_PN532.h>
+
+#define PN532_SCK  (17)
+#define PN532_MOSI (16)
+#define PN532_SS   (18)
+#define PN532_MISO (19)
+
+#define L1         (14) //LED1 indicates activity
+#define L2         (5)  //LED2 indicates the emulation process 
+#define L3         (4)  
+
+#define NPIN       (27) //NFC Button
+
+Adafruit_PN532 nfc(PN532_SCK, PN532_MISO, PN532_MOSI, PN532_SS);
+
+void setup(){
+  pinMode(L1, OUTPUT);
+  pinMode(L2, OUTPUT);
+  pinMode(L3, OUTPUT);
+  pinMode(NPIN, INPUT_PULLUP);
+
+  Serial.begin(115200);
+  //while(!Serial){}
+  Serial.println("Hello!");
+
+  nfc.begin();
+
+  uint32_t versiondata = nfc.getFirmwareVersion();
+  if (! versiondata) {
+    Serial.print("Didn't find PN53x board");
+    while (1); // halt
+  }
+
+  // blink to show we started up
+  blink(L1, 200, 2);
+  blink(L2, 200, 2);
+  blink(L3, 200, 2);
+
+  // Got ok data, print it out!
+  Serial.print("Found chip PN5"); Serial.println((versiondata>>24) & 0xFF, HEX); 
+  Serial.print("Firmware ver. "); Serial.print((versiondata>>16) & 0xFF, DEC); 
+  Serial.print('.'); Serial.println((versiondata>>8) & 0xFF, DEC);
+
+  nfc.setPassiveActivationRetries(0xFF);
+
+  // configure board to read RFID tags
+  nfc.SAMConfig();
+
+}
+
+void blink(int pin, int msdelay, int times){
+  for (int i = 0; i < times; i++){
+    digitalWrite(pin, HIGH);
+    delay(msdelay);
+    digitalWrite(pin, LOW);
+    delay(msdelay);
+  }
+}
+
+void printData(uint8_t* buff, uint8_t lenbuffer, bool cmd){
+  char tmp[1];
+
+  if (cmd)
+    Serial.print("Command: ");
+  else
+    Serial.print("\nCard answer: ");
+
+  for (uint8_t u = 0; u < lenbuffer; u++) {
+    sprintf(tmp, "0x%.2X",buff[u]);
+    Serial.print(tmp); Serial.print(" ");
+  }
+
+  if (!cmd)
+    Serial.println("\n-----");
+}
+
+/* Checking for PDOL
+ * 
+ * PDOL tag(9F38) contains requierement specs for the transaction, useful for analysis
+ * 
+ */
+void chkPDOL(uint8_t* buff, uint8_t lenbuffer){
+  bool existpdol;
+  char tmp[1];
+
+  for (uint8_t u = 0; u < lenbuffer; u++) {
+    if (buff[u] == 0x9F && buff[u+1] == 0x38){
+      existpdol = true;
+      Serial.print("-->PDOL found: ");
+      for (uint8_t e = 0; e <= buff[u+2]; e++){
+        sprintf(tmp, "0x%.2X",buff[u+e+2]);
+        Serial.print(tmp); Serial.print(" ");
+      }
+      Serial.println("\n-----");
+    }
+  }
+  if (!existpdol)
+    Serial.print("Info: could not find the PDOL!");
+}
+
+/* Reading a Visa Card function
+ * 
+ * ppse: ppse is the first command to initialize the comunnication
+ * visa: second command to select the Visa application
+ * processing: assuming that the card does not cointain a PDOL
+ * sfi: to read the file where the track 2 is usually located
+ */
+void readcard(){ //NFC reading process 
+  uint8_t apdubuffer[255]= {}, apdulen;
+
+  uint8_t ppse[] = {0x00, 0xA4, 0x04, 0x00, 0x0e, 0x32, 0x50, 0x41, 0x59, 0x2e, 0x53, 0x59, 0x53, 0x2e, 0x44, 0x44, 0x46, 0x30, 0x31, 0x00}; //20
+  uint8_t visa[] = {0x00, 0xA4, 0x04, 0x00, 0x07, 0xa0, 0x00, 0x00, 0x00, 0x03, 0x10, 0x10, 0x00}; //13
+  uint8_t processing [] = {0x80, 0xA8, 0x00, 0x00, 0x02, 0x83, 0x00, 0x00}; //8
+  uint8_t sfi[] = {0x00, 0xb2, 0x01, 0x0c, 0x00}; //5
+
+  uint8_t *apdus[] = {ppse, visa, processing, sfi}; 
+  uint8_t apdusLen [] = { sizeof(ppse), sizeof(visa), sizeof(processing), sizeof(sfi)};
+
+  for (uint8_t i = 0; i < 4; i++){
+    blink(L2, 150, 1);
+    printData(apdus[i], apdusLen[i], true);
+    if (nfc.inDataExchange(apdus[i], apdusLen[i], &apdubuffer[0], &apdulen)) {
+      printData(apdubuffer, apdulen, false);
+      if (i == 1){
+        chkPDOL(apdubuffer, apdulen);
+      }
+    }
+  }
+}
+
+bool waitcard(){ // Wait and try to read a Visa NFC card
+  return nfc.inListPassiveTarget();
+}
+
+void nfcbutton(){ // Activate NFC reading or emulate card from a previous reading
+  if (digitalRead(NPIN) == 0){
+    blink(L2, 150, 1);
+    Serial.println("Activating NFC...");
+
+    if (!waitcard())
+      Serial.println("Error: Could not find a NFC card...");  
+    else    
+      readcard();
+
+    blink(L1, 100, 3);
+    delay(400);
+  }
+}
+
+void loop(){ // Main loop
+  nfcbutton();
+}