Question

我正在尝试创建一个基于NFC的储物柜系统。每个储物柜都将连接到它自己的NFC读取器，该读取器全部由一个单独的arduino管理。

Here is my code:
#include <SPI.h>
#include <MFRC522.h>

#define SS_1_PIN 10 // Attach Reader #1
#define SS_2_PIN 8 // Attach Reader #2
#define RST_PIN 9
#define NR_OF_READERS 2 // 

byte ssPins[] = {SS_1_PIN, SS_2_PIN};
int referTable[2] = {0,1};// Reference table
int lockerStatus[2] = {0,0}; //0 for Unoccuupied & 1 for Occupied
byte uidRecord[2][4]; // Array of UID to be Set
int cardBalance;
int lockerPrice = 20;
uint8_t reader;

MFRC522 mfrc522[NR_OF_READERS]; // Create MFRC522 instances
MFRC522::MIFARE_Key key;


void setup() {

  Serial.begin(9600); // Initialize serial communications with the PC
  while (!Serial);    // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)

  SPI.begin();        // Init SPI bus



  // Prepare the key (used both as key A and as key B)
  // using FFFFFFFFFFFFh which is the default at chip delivery from the factory  
  for (byte i = 0; i < 6; i++) {
        key.keyByte[i] = 0xFF;
    }


Serial.println(F("Scan a MIFARE Classic PICC to demonstrate Value Block mode."));
Serial.print(F("Using key (for A and B):"));
dump_byte_array(key.keyByte, MFRC522::MF_KEY_SIZE);
Serial.println();

Serial.println(F("BEWARE: Data will be written to the PICC, in sector #1"));


  for (reader = 0; reader < NR_OF_READERS; reader++) {
    mfrc522[reader].PCD_Init(ssPins[reader], RST_PIN); // Init each MFRC522 card
    Serial.print(F("Reader "));
    Serial.print(reader);
    Serial.print(F(": "));
    mfrc522[reader].PCD_DumpVersionToSerial();
  }
}

void loop() {

for (reader = 0; reader < NR_OF_READERS; reader++) {
    // Look for new cards
if (mfrc522[reader].PICC_IsNewCardPresent() && mfrc522[reader].PICC_ReadCardSerial()) {
  Serial.print(F("Reader "));
  Serial.print(reader);
  // Show some details of the PICC (that is: the tag/card)
  Serial.print(F(": Card UID:"));
  dump_byte_array(mfrc522[reader].uid.uidByte, mfrc522[reader].uid.size);
  Serial.println();
  Serial.print(F("PICC type: "));
  MFRC522::PICC_Type piccType = mfrc522[reader].PICC_GetType(mfrc522[reader].uid.sak);
  Serial.println(mfrc522[reader].PICC_GetTypeName(piccType));


  // Halt PICC
  mfrc522[reader].PICC_HaltA();
  // Stop encryption on PCD
  mfrc522[reader].PCD_StopCrypto1();

//LOCKER SETUP FILE STARTS HERE

// Check for compatibility
if (    piccType != MFRC522::PICC_TYPE_MIFARE_MINI
    &&  piccType != MFRC522::PICC_TYPE_MIFARE_1K
    &&  piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
    Serial.println(F("This sample only works with MIFARE Classic cards."));
    return;
}
  //Check if Current reader Locker is occupied
  if (lockerStatus[reader] == 0) {
    Serial.print(F("Locker is Available to use"));
    Serial.println();

  //Assign Locker to UID
      for (byte i = 0; i < 4; i++) {
        uidRecord[reader][i] = mfrc522[reader].uid.uidByte[i];
          }
        Serial.print(F("The UID:"));
        dump_byte_array(mfrc522[reader].uid.uidByte, mfrc522[reader].uid.size);
        Serial.print(F(" has been assgined to Reader "));
        Serial.print(reader);
        Serial.println();  

   //Subtract Amount on Sector1 B5
        byte sector         = 1;
        byte valueBlockA    = 5;
        byte trailerBlock   = 7;
        MFRC522::StatusCode status;
        byte buffer[18];
        byte size = sizeof(buffer);
        int32_t value;

        // Authenticate using key A
              Serial.println(F("Authenticating using key A..."));
              status = mfrc522[reader].PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(mfrc522[reader].uid));
              if (status != MFRC522::STATUS_OK) {
              Serial.print(F("PCD_Authenticate() failed:"));
              Serial.println(mfrc522[reader].GetStatusCodeName(status));
              return;
              }
          byte trailerBuffer[] = {
          255, 255, 255, 255, 255, 255,       // Keep default key A
          0, 0, 0,
          0,
          255, 255, 255, 255, 255, 255};      // Keep default key B

当涉及多个阅读器时，我无法通过密钥A进行身份验证。当它只是一个阅读器时，我没有问题，但是当我添加第二个NFC阅读器时，我无法弄清楚身份验证部分出了什么问题。

我已经找到问题所在了

status = mfrc522[reader].PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(mfrc522[reader].uid));

我认为是问题所在，因为

The UID: AB 3F 3E E9 has been assgined to Reader 0
Authenticating using key A...
PCD_Authenticate() failed:Timeout in communication.

是我在串行监视器上看到的错误。我认为它与uid指针或尾部块或键有某种关系。但是我只是想不通。

P.S。问题区域后，我已省略了大部分代码。

任何帮助将不胜感激！

MFRC522 NFC多个读取器-身份验证问题

0 个答案: