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[Energia Library] NFC card reading with Energia - MF RC 522

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Hi everybody,   >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<   >>> UPDATE 2 - Added "keywords.txt" file for synta

Hi! I got my RC522 up and running this morning and just thought I'd share what worked for me..   I tried running three different Energia-versions of the library, but none of them worked. I tried pri

Okay guys,   Did some work this morning to transform the test code into a proper library. It should be more usable and generic. I haven't made a "keywords.txt". The methods should be self explanator

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Hi @@Thinhnguyenky and welcome to 43oh...


The library for the card reader has a number of functions that allow the user to access and use the device.


Mfrc522 Mfrc522(chipSelectPin,NRSTDP); - creates a new instance named Mfrc522 that can be used to access the library

Mfrc522.Init();" - initializes the device using the instance specified above

Mfrc522.Request(PICC_REQIDL, str); - requests information from the card reader


The examples give simplified code that demonstrates how they work.


If you need a beginner's guide on how a library works see this: http://energia.nu/guide/tutorial_library/


If you would like to see the specific code and documentation associated with these functions then look in the .cpp and .h files that come with the library.

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Maybe it will help someone. You can use arduino's library https://github.com/miguelbalboa/rfid with Energia. All that you need is comment out all SPI.beginTransaction and SPI.endTransaction lines in MFRC522.cpp, and also define SS constant (SDA/chip select pin number, #define SS 8 in my case) in the same file.


After this library itself and library exambles are working at least on Tiva C launchpad.

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On 17.08.2013 at 3:34 AM, D69 said:

OK, spent a bit of time on this this evening.

Tried knocking together some code to allow hard coding of tag IDs which works OK. Might need to change the for loop though as anything in else just gets repeated, a switch might do the trick but it's late.

For anyone interested, here's my code, would appreciate any improvements that could be made, including an scenario where the tag's not recognized as valid.

	Example file for communicating with the NFRC522. The program prints the card data.
	Created by Eelco Rouw - Originally adapted by Grant Gibson. 

// Pinout
// SDA  - 2.2
// SCK  - 1.5
// Mosi - 1.7
// Miso - 1.6
// IRQ  - NC
// GND  - GND
// RST  - 1.3
// VCC  - VCC

#include <Mfrc522.h>

// the sensor communicates using SPI, so include the library:
#include <SPI.h>

int chipSelectPin = 10;
int NRSTDP = 5;
int ledpin1 = 3;
int ledpin2 = 6;
int cardint = 5;

Mfrc522 Mfrc522(chipSelectPin,NRSTDP);
unsigned char serNum[5];
unsigned char sectorKey[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
unsigned char readData[16];

void setup() 
	Serial.begin(9600);                       // RFID reader SOUT pin connected to Serial RX pin at 2400bps 
	// Start the SPI library:
	// Initialize the Card Reader
	digitalWrite(chipSelectPin, LOW);
	pinMode(RED_LED, OUTPUT);
        pinMode(ledpin1, OUTPUT);
        pinMode(ledpin2, OUTPUT);

void loop()
	unsigned char i,tmp;
	unsigned char status;
	unsigned char str[MAX_LEN];
	unsigned char RC_size;
	unsigned char blockAddr;
	//String mynum = "";
        String mycardno;
        char* myarray[2][5]={  //Array of tags and related names, tag numbers copied from serial console after 1s
	status = Mfrc522.Request(PICC_REQIDL, str);	
	if (status == MI_OK)
		Serial.println("Card detected");
		Serial.print(" , ");
		Serial.println(" ");

	status = Mfrc522.Anticoll(str);
	memcpy(serNum, str, 5);
	if (status == MI_OK)
		Serial.println("The card's number is  : ");
		Serial.print(serNum[0], DEC);
		Serial.print(" , ");
		Serial.print(serNum[1], DEC);
		Serial.print(" , ");
		Serial.print(serNum[2], DEC);
		Serial.print(" , ");
		Serial.print(serNum[3], DEC);
		Serial.print(" , ");
		Serial.print(serNum[4], DEC);
		Serial.println(" ");
                mycardno = String(serNum[0]) += String(serNum[1]) += String(serNum[2]) += String(serNum[3]) += String(serNum[4]); // Appends the content of the serNum array to give a unique card no
                status = Mfrc522.Auth(PICC_AUTHENT1A,1,sectorKey,serNum);
                if (status == MI_OK)
                } else
                  Serial.println("Error authenticating...\r\n");
                status = Mfrc522.ReadBlock(1, readData);
                if (status == MI_OK)
                  for(i=0; i<16; i++)
                } else {
                  Serial.println("Error reading.");
                int i;
                for(i = 0; i < 5; i = i + 1)
                  if (mycardno == myarray[0][i])
                  Serial.print("Hello ");
                  Serial.println(myarray[1][i]);        // Should Print out name matching tag
                /*else {
                  Serial.println("Bugger Off");
	//Serial.println(" ");


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