RC522 arduino module

Projects General Guidance
1

Hello, this is my very first ask in this forum, just to the point, i wanna using rc522 but using library is too easy and i cant learn something new with just learning using library, so i decided to using rc522 and code it without library, but i getting confused because why my code not work even i though it should be work fine, and i have been try with module too and its can its mean the wire is right already, and when i use my code that is not work, here is my code:

#include <SPI.h>

int RFIDsda = 2, RFIDsck = 13, RFIDmosi = 11;
int RFIDmi = 12, RFIDrst = 3;
byte RegFifoData = 0x09, RegFifoLevel = 0x0a;
byte RegCommand = 0x01, RegBitFraming = 0x0D;
byte RegFIFOLevelReg = 0x08, RegTxControl = 0x14;

void RFIDreset() {
  digitalWrite(RFIDrst, LOW);
  delay(5);
  digitalWrite(RFIDrst, HIGH);
}
void RFIDsend(byte reg, byte data) {
  digitalWrite(RFIDsda, LOW);
  SPI.transfer((reg << 1) & 0x7E);
  SPI.transfer(data);
  digitalWrite(RFIDsda, HIGH);
}
byte RFIDread(byte reg) {
  digitalWrite(RFIDsda, LOW);
  SPI.transfer(((reg << 1) & 0x7E) | 0x80);
  byte val = SPI.transfer(0x00);
  digitalWrite(RFIDsda, HIGH);
  return val;
}
void RFIDgetCard() {
  RFIDsend(RegCommand, 0x00);    // Idle
  RFIDsend(RegFifoLevel, 0x80);   // Flush FIFO
  RFIDsend(RegBitFraming, 0x07);  // 7 bits utk REQA
  RFIDsend(RegFifoData, 0x26);    // REQA
  RFIDsend(RegCommand, 0x0C);     // Transceive

  while (RFIDread(RegCommand) & 0x1F); // tunggu selesai

  byte error = RFIDread(0x06); // ErrorReg
  if (error != 0) {
    Serial.print("Err: ");
    Serial.println(error, HEX);
    return; // ga usah baca FIFO
  }

  byte level = RFIDread(RegFifoLevel);
  if (level > 0) {
    Serial.print("Ada kartu! FIFO: ");
    Serial.println(level);
    for (byte i = 0; i < level; i++) {
      Serial.print(RFIDread(RegFifoData), HEX);
      Serial.print(" ");
    }
    Serial.println();
  } else {
    Serial.println("Ga ada kartu.");
  }
}


void setup() {
  pinMode(RFIDsda, OUTPUT);
  pinMode(RFIDrst, OUTPUT);
  digitalWrite(RFIDsda, HIGH); digitalWrite(RFIDrst, HIGH);

  SPI.begin();
  Serial.begin(250000);
  RFIDsend(RegCommand, 0x0F); // Soft reset
  delay(50);
  RFIDsend(RegTxControl, 0x83);
  RFIDsend(RegCommand, 0x00);
  RFIDreset();
  RFIDsend(RegTxControl, 0x83); // antena nyala setelah reset
}
void loop() {
  
  RFIDgetCard();
  delay(300);
  Serial.print("ErrorReg: "); Serial.println(RFIDread(0x06), HEX);
  Serial.print("Status2: "); Serial.println(RFIDread(0x09), HEX);

}```
2

I don't see any debug output to work with.
As far as using a library is concerned, I have been programming since 1959 and if I have a library I can use I will.
Good luck.

4

Nonsense.

If the setup works with the library, the modules are functioning and the wiring is correct.

Then you can go off, write your own code and "learn something".

6

Your "write to register"...

... does not look like the library's "write value to register"

void MFRC522::PCD_WriteRegister(	PCD_Register reg,	///< The register to write to. One of the PCD_Register enums.
									byte value			///< The value to write.
								) {
	SPI.beginTransaction(SPISettings(MFRC522_SPICLOCK, MSBFIRST, SPI_MODE0));	// Set the settings to work with SPI bus
	digitalWrite(_chipSelectPin, LOW);		// Select slave
	SPI.transfer(reg);						// MSB == 0 is for writing. LSB is not used in address. Datasheet section 8.1.2.3.
	SPI.transfer(value);
	digitalWrite(_chipSelectPin, HIGH);		// Release slave again
	SPI.endTransaction(); // Stop using the SPI bus
} // End PCD_WriteRegister()

Read the MFRC522 library and learn from it. GitHub - miguelbalboa/rfid: Arduino RFID Library for MFRC522

7 
while (RFIDread(RegCommand) & 0x1F); // Wait until done

This Transceive Wait loop can hang.
You can try this instead.

unsigned long start = millis();
while ((RFIDread(CommandReg) & 0x1F) && (millis() - start < 500)); // 500ms timeout

To confirm whether Transceive is done and successful, check bit 2 of CommIrqReg (0x04):

if (RFIDread(0x04) & 0x30) {
  // Bit 4: RxIRq, Bit 5: IdleIRq
}

Here is a simplified example of interfacing RC-522 with Arduino. You can see it. Interfacing of RFID RC522 with Arduino - The Engineering Projects

8

i was learning in arduino so i wanna learning more so that i know how its work, thx for you reply