MFRC522 APDU Response

Using Arduino Programming Questions
1

Hello there. I am trying to get APDU response from reader with PN512 chip but without success. Any one who have that problem already and can help ? I recieve wrong answer on that command. Here is my code:

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 2
#define RST_PIN 3

MFRC522::StatusCode status;

MFRC522 rfid(SS_PIN, RST_PIN);
void setup() {

  Serial.begin(115200);
  Serial.setTimeout(1);
  SPI.begin(); // init SPI bus
    
  rfid.PCD_Init(); // init MFRC522
  rfid.PCD_SetAntennaGain(rfid.RxGain_max);
  //rfid.PCD_SetAntennaGain(112);

  rfid.PCD_AntennaOn();
  Serial.println("Tap RFID/NFC Tag on reader");

}

void loop() {

byte bufferATQA[10];
byte bufferSize = sizeof(bufferATQA);

  // reply only when you receive data:
  if (Serial.available() > 0) {
    // read the incoming byte:
    String incomingByte = Serial.readString();

    incomingByte.trim();

    Serial.println(incomingByte);
  }
  if (rfid.PICC_IsNewCardPresent()) {
rfid.PICC_WakeupA(bufferATQA, &bufferSize);
  rfid.PICC_RequestA(bufferATQA, bufferSize);


        MFRC522::StatusCode status;
    byte sendData[] = {
    0x00,
    0xA4,
    0x04,
    0x00,
    0x0e,
    0x32,
    0x50,
    0x41,
    0x59,
    0x2e,
    0x53,
    0x59,
    0x53,
    0x2e,
    0x44,
    0x44,
    0x46,
    0x30,
    0x31,
    0x00
  };
  byte backData[255];

    byte backLen;
    status = rfid.PCD_TransceiveData(sendData, sizeof(sendData), backData, backLen);
        if ( status != MFRC522::STATUS_OK) {
Serial.print(F("PCD_TransceiveData() failed: "));
Serial.println(rfid.GetStatusCodeName(status));
return;
}
else
{
Serial.println(F("PICC_TransceiveData() success "));

  for(int i = 0; i < sizeof(backData); i++) {
    Serial.print(backData[i], HEX);
  }

  Serial.println("---------------");
}
      rfid.PICC_HaltA(); // halt PICC
      rfid.PCD_StopCrypto1(); // stop encryption on PCD

  }
}

thx

2

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