Hello
i have been trying for a while to write an integer called yourvalue to MIFARE 1KB
card but i didn't reach a way to do that . can anyone give me a hand with my code?
#include <SPI.h>
#include <MFRC522.h>
/*Using Hardware SPI of Arduino */
/*MOSI (11), MISO (12) and SCK (13) are fixed */
/*You can configure SS and RST Pins*/
#define SS_PIN 3 /* Slave Select Pin */
#define RST_PIN 2 /* Reset Pin */
/* Create an instance of MFRC522 */
MFRC522 mfrc522(SS_PIN, RST_PIN);
/* Create an instance of MIFARE_Key */
MFRC522::MIFARE_Key key;
/* Set the block to which we want to write data */
/* Be aware of Sector Trailer Blocks */
int blockNum = 2;
/* Create an array of 16 Bytes and fill it with data */
/* This is the actual data which is going to be written into the card */
byte blockData [16] = {"Electronics-Hub-"};
/* Create another array to read data from Block */
/* Legthn of buffer should be 2 Bytes more than the size of Block (16 Bytes) */
byte bufferLen = 18;
byte readBlockData[18];
int yourValue;
MFRC522::StatusCode status;
void setup()
{
/* Initialize serial communications with the PC */
Serial.begin(9600);
/* Initialize SPI bus */
SPI.begin();
/* Initialize MFRC522 Module */
mfrc522.PCD_Init();
Serial.println("Scan a MIFARE 1K Tag to write data...");
}
void loop()
{
/* Prepare the ksy for authentication */
/* All keys are set to FFFFFFFFFFFFh at chip delivery from the factory */
for (byte i = 0; i < 6; i++)
{
key.keyByte[i] = 0xFF;
}
/* Look for new cards */
/* Reset the loop if no new card is present on RC522 Reader */
if ( ! mfrc522.PICC_IsNewCardPresent())
{
return;
}
/* Select one of the cards */
if ( ! mfrc522.PICC_ReadCardSerial())
{
return;
}
Serial.print("\n");
Serial.println("**Card Detected**");
/* Print UID of the Card */
Serial.print(F("Card UID:"));
for (byte i = 0; i < mfrc522.uid.size; i++)
{
Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
Serial.print(mfrc522.uid.uidByte[i], HEX);
}
Serial.print("\n");
/* Print type of card (for example, MIFARE 1K) */
Serial.print(F("PICC type: "));
MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
Serial.println(mfrc522.PICC_GetTypeName(piccType));
/* Call 'WriteDataToBlock' function, which will write data to the block */
Serial.print("\n");
Serial.println("Writing to Data Block...");
WriteDataToBlock(blockNum, blockData);
/* Read data from the same block */
Serial.print("\n");
Serial.println("Reading from Data Block...");
ReadDataFromBlock(blockNum, readBlockData);
/* If you want to print the full memory dump, uncomment the next line */
//mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
/* Print the data read from block */
Serial.print("\n");
Serial.print("Data in Block:");
Serial.print(blockNum);
Serial.print(" --> ");
yourValue = ((int)readBlockData[1])<<8 | readBlockData[0];
Serial.write(yourValue);
// for (int j=0 ; j<16 ; j++)
// {
// Serial.write(readBlockData[j]);
// }
Serial.print("\n");
}
void WriteDataToBlock(int blockNum, byte blockData[])
{
/* Authenticating the desired data block for write access using Key A */
status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, blockNum, &key, &(mfrc522.uid));
if (status != MFRC522::STATUS_OK)
{
Serial.print("Authentication failed for Write: ");
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}
else
{
Serial.println("Authentication success");
}
blockData[0] = (byte)(1500 & 0xFF);
blockData[1] = (byte)(1500 >> 8);
/* Write data to the block */
status = mfrc522.MIFARE_Write(blockNum, blockData, 16);
if (status != MFRC522::STATUS_OK)
{
Serial.print("Writing to Block failed: ");
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}
else
{
Serial.println("Data was written into Block successfully");
}
}
void ReadDataFromBlock(int blockNum, byte readBlockData[])
{
/* Authenticating the desired data block for Read access using Key A */
byte status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, blockNum, &key, &(mfrc522.uid));
if (status != MFRC522::STATUS_OK)
{
Serial.print("Authentication failed for Read: ");
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}
else
{
Serial.println("Authentication success");
}
/* Reading data from the Block */
status = mfrc522.MIFARE_Read(blockNum, readBlockData, &bufferLen);
if (status != MFRC522::STATUS_OK)
{
Serial.print("Reading failed: ");
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}
else
{
Serial.println("Block was read successfully");
}
}