hello, can someone help me out in getting the "readbackblock[j]" array output to integer
this code is used reading and writing to rfid tag
once, i get the output in integer, i need to increment and decrement the block value
the functions are in the code below the main code
#include <SPI.h>
#include <MFRC522.h>
#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);
MFRC522::MIFARE_Key key;
int block = 10;
byte blockcontent[16] = {"5000"};
byte readbackblock[18];
void setup() {
Serial.begin(9600);
SPI.begin();
mfrc522.PCD_Init();
Serial.println("Scan a MIFARE Classic card");
for (byte i = 0; i < 6; i++) {
key.keyByte[i] = 0xFF;//keyByte is defined in the "MIFARE_Key" 'struct' definition in the .h file of the library
}
}
void loop()
{
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}
Serial.println("card selected");
Serial.println("Read before write");
readBlock(block, readbackblock);
Serial.print("read block: ");
for (int j = 0 ; j < 16 ; j++)
{
Serial.write (readbackblock[j]);
}
Serial.println("");
Serial.println("Write after Read");
writeBlock(block, blockcontent);
Serial.println("Read after Write");
readBlock(block, readbackblock);
Serial.print("read block: ");
for (int j = 0 ; j < 16 ; j++)
{
Serial.write (readbackblock[j]);//Serial.write() transmits the ASCII numbers as human readable characters to serial monitor
}
Serial.println("");
mfrc522.PICC_HaltA();
mfrc522.PCD_StopCrypto1();
}
int writeBlock(int blockNumber, byte arrayAddress[])
{
//this makes sure that we only write into data blocks. Every 4th block is a trailer block for the access/security info.
int largestModulo4Number=blockNumber/4*4;
int trailerBlock=largestModulo4Number+3;//determine trailer block for the sector
if (blockNumber > 2 && (blockNumber+1)%4 == 0){Serial.print(blockNumber);Serial.println(" is a trailer block:");return 2;}//block number is a trailer block (modulo 4); quit and send error code 2
// Serial.print(blockNumber);
// Serial.println(" is a data block:");
/*****************************************authentication of the desired block for access***********************************************************/
byte status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(mfrc522.uid));
//byte PCD_Authenticate(byte command, byte blockAddr, MIFARE_Key *key, Uid *uid);
//this method is used to authenticate a certain block for writing or reading
//command: See enumerations above -> PICC_CMD_MF_AUTH_KEY_A = 0x60 (=1100000), // this command performs authentication with Key A
//blockAddr is the number of the block from 0 to 15.
//MIFARE_Key *key is a pointer to the MIFARE_Key struct defined above, this struct needs to be defined for each block. New cards have all A/B= FF FF FF FF FF FF
//Uid *uid is a pointer to the UID struct that contains the user ID of the card.
if (status != MFRC522::STATUS_OK) {
Serial.print("PCD_Authenticate() failed: ");
Serial.println(mfrc522.GetStatusCodeName(status));
return 3;//return "3" as error message
}
//it appears the authentication needs to be made before every block read/write within a specific sector.
//If a different sector is being authenticated access to the previous one is lost.
/*****************************************writing the block***********************************************************/
status = mfrc522.MIFARE_Write(blockNumber, arrayAddress, 16);//valueBlockA is the block number, MIFARE_Write(block number (0-15), byte array containing 16 values, number of bytes in block (=16))
//status = mfrc522.MIFARE_Write(9, value1Block, 16);
if (status != MFRC522::STATUS_OK) {
Serial.print("MIFARE_Write() failed: ");
Serial.println(mfrc522.GetStatusCodeName(status));
return 4;//return "4" as error message
}
Serial.println("block was written");
}
int readBlock(int blockNumber, byte arrayAddress[])
{
int largestModulo4Number=blockNumber/4*4;
int trailerBlock=largestModulo4Number+3;//determine trailer block for the sector
/*****************************************authentication of the desired block for access***********************************************************/
byte status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(mfrc522.uid));
//byte PCD_Authenticate(byte command, byte blockAddr, MIFARE_Key *key, Uid *uid);
//this method is used to authenticate a certain block for writing or reading
//command: See enumerations above -> PICC_CMD_MF_AUTH_KEY_A = 0x60 (=1100000), // this command performs authentication with Key A
//blockAddr is the number of the block from 0 to 15.
//MIFARE_Key *key is a pointer to the MIFARE_Key struct defined above, this struct needs to be defined for each block. New cards have all A/B= FF FF FF FF FF FF
//Uid *uid is a pointer to the UID struct that contains the user ID of the card.
if (status != MFRC522::STATUS_OK) {
Serial.print("PCD_Authenticate() failed (read): ");
Serial.println(mfrc522.GetStatusCodeName(status));
return 3;//return "3" as error message
}
//it appears the authentication needs to be made before every block read/write within a specific sector.
//If a different sector is being authenticated access to the previous one is lost.
/*****************************************reading a block***********************************************************/
byte buffersize = 18;//we need to define a variable with the read buffer size, since the MIFARE_Read method below needs a pointer to the variable that contains the size...
status = mfrc522.MIFARE_Read(blockNumber, arrayAddress, &buffersize);//&buffersize is a pointer to the buffersize variable; MIFARE_Read requires a pointer instead of just a number
if (status != MFRC522::STATUS_OK) {
Serial.print("MIFARE_read() failed: ");
Serial.println(mfrc522.GetStatusCodeName(status));
return 4;//return "4" as error message
}
Serial.println("block was read");
}
One needs strtoull which does not exist in arduino land so you have to write it yourself.