rfid-rc22-lectura.c

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

#define RST_PIN 9 // Configurable
#define SS_PIN 10 // Configurable

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.

MFRC522::MIFARE_Key key;

/**
* Initialize.
*/
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
mfrc522.PCD_Init(); // Init MFRC522 card

// 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("Ingrese Tarjeta"));
}

/**
* Main loop.
*/
void loop() {
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent())
return;

// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial())
return;
//Se especifica el sector y bloque que se leerá
//Nota:Este debe coincidir con el bloque en que se escribió en el primer programa, o simplemente con el bloque que se desee leer
byte sector = 1;
byte blockAddr = 6; //Se especifica que bloque se leera _____------______-----______
byte dataBlock[] = {
0x01, 0x02, 0x03, 0x04, // 1, 2, 3, 4,
0x05, 0x06, 0x07, 0x08, // 5, 6, 7, 8,
0x08, 0x09, 0xff, 0x0b, // 9, 10, 255, 12,
0x0c, 0x0d, 0x0e, 0x0f // 13, 14, 15, 16
};
byte trailerBlock = 7;
MFRC522::StatusCode status;
byte buffer[18];
byte size = sizeof(buffer);

Serial.println(F("Datos actuales en el sector:"));
mfrc522.PICC_DumpMifareClassicSectorToSerial(&(mfrc522.uid), &key, sector);
Serial.println();

// Read data from the block
Serial.print(F("Cargando dato del bloque ")); Serial.print(blockAddr);
Serial.println(F(" ..."));
status = (MFRC522::StatusCode) mfrc522.MIFARE_Read(blockAddr, buffer, &size);
if (status != MFRC522::STATUS_OK) {
Serial.print(F("MIFARE_Read() failed: "));
Serial.println(mfrc522.GetStatusCodeName(status));
}
Serial.print(F("Dato en el bloque ")); Serial.print(blockAddr); Serial.println(F(":"));
dump_byte_array(buffer, 16); Serial.println();
Serial.println();

}


void dump_byte_array(byte *buffer, byte bufferSize) {
    for (byte i = 0; i < bufferSize; i++) {
      //  Serial.print(buffer[i] < 0x10 ? " 0" : " ");
       // Serial.print(buffer[i], HEX);
    }
}