Reading ISO14443B cards with 77 81 85 Protocol?

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Hello all,

I'm currently working on a project to develop an RFID reader that is able to detect and out the unique identifier of ISO 14443B cards. The reader I am using is an RDM8800 connected to a ITEAD Studio FOCA v2.0 board. This allows the code to sent to the reader using Arduino 1.0.6

As of now, I am able to detect and obtain the unique identification numbers of such cards operating on F7 81 85 Protocol, but not so for those with 77 81 85 Protocol. Can I get some advice on whether it is possible to modify the code/circuit to read those with the latter protocol?

I've also attached the datasheets for the components that I am using for the circuit. Any help on this is greatly appreciated.

The code I am using is:

/******************** RDM8800 *************************
This vesion source code of RDM8800 firmware reads Singapore's EZLink cards.
They use 13.56MHZ RFID Tag type ISO 14443 Type B[1] / CEPAS protocol.

When a card is detected it returns as a comma seperated list of text fields.
They are the card number, balance, number of days since 1995-01-01 to expire 
and number of days since 1995-01-01 created.

So for example:

Presenting a card will return:

1000130019390060,8.38,9107,6915

Which can be broken up into the following comma seperated fields:

Number: 1000130019390060
Balance: 8.38
Expire days: 9107
Created days: 6915




************************************************************/

#include <PN532Lib.h>
#include <SPI.h>

#define PN532_CS 10

//LED indicator
const int LED = 6;

// set PN532 instance
PN532Lib nfc(PN532_CS);

uint8_t cardDataIn[128];

uint8_t cardDataOut[] = {
  0x01,  // target number (always 1)
  0x90,  // command class 
  0x32,  // INS - read purse
  0x03,  // purse #3
  0x00,  // param 1
  0x00,  // param 2
  0x00,  // LC 
  0x00   // ??
};

void setup() {
  // setup serial at 9600 baud
  Serial.begin(9600);
  
  // startup the nfc card reader
  nfc.begin();
  nfc.SAMConfig();
  
  uint32_t versiondata = nfc.getFirmwareVersion();
  Serial.print(versiondata);
  if (! versiondata) {
    Serial.print("Didn't find PN53x board");
    while (1); // halt
  }

  pinMode(LED,OUTPUT);
  digitalWrite(LED,HIGH);
  delay(2000);
  digitalWrite(LED,LOW);
}


void loop() {
  
  
  // look for EzLink cards
  uint32_t id = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443B, PN532_CARDTYPEB);

  // if random tag id number then we have a card
  if (id != 0) {
    Serial.print("Card detected");
    // now request the card data
    if ( nfc.dataExchange(cardDataOut, sizeof(cardDataOut), cardDataIn, sizeof(cardDataIn)) ) {
      // if card data found set the LED to on
      digitalWrite(LED,HIGH);

      // send out the card number
      uint8_t i;
      for ( i = 0; i < 8; i ++ ) {
        Serial.print((cardDataIn[8 + i] >> 4) & 0x0F, HEX);
        Serial.print(cardDataIn[8 + i] & 0x0F, HEX);
      }
    
      // send out the balance
      double balance = (cardDataIn[2] <<  16 ) | (cardDataIn[3] << 8 ) | (cardDataIn[4] );
      Serial.print(",");
      Serial.print(balance / 100);

      // send out the expired day count from 1995
      uint32_t expireDays = (cardDataIn[24] << 8 ) | (cardDataIn[25]);
      Serial.print(",");
      Serial.print(expireDays);

      // send out the created days
      uint32_t createDays = (cardDataIn[26] << 8 ) | (cardDataIn[27]);
      Serial.print(",");
      Serial.print(createDays);
  
      // send the end or record cr/lf
      Serial.println(" ");

      // wait a bit for the LED
      delay(20);
      
      // off LED
      digitalWrite(LED,LOW);
    }
  }
  // loop delay before the next read attempt
  delay(100);
}

Foca.pdf (388 KB)

RDM8800-Itead Studio.pdf (332 KB)