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

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Thanks for sharing this, its the first code I've found that actually differentiates between cards.

Been searching for a few days now and still very new to ide / c. 


Thanks Leon

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Tell me pls one thing which i cann't understand : we have the RC522 module powered by 3.3v  . What power do i need for Arduino - 3.3v or it is possible to connect to 5 v power suply ?



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Igorx, this is for the msp430 launchpad, not arduino but both dev boards will take 5v and have a 3v output you can use

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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 syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<


>>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<


I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#commentswhere he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)


The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf


I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 


After these changes it works like a charm. 


Just connect the following lines:

MOSI LP -> Pin 3 of the module

MISO LP -> Pin 4 of the module

PIn 1.3 LP -> Pin 1 of the module (SS)

Pin 2.2 LP -> Pin 7 of the module (RST)

Pin 1.5 LP -> Pin 2 of the module (SCK)

GND LP -> Pin 6 of the module

VCC LP -> Pin 8 of the module

Pin 5 is not connected.


Included is the sketch (attachicon.gifMfrc522.zip) I used. Now onto opening doors and paying electronically!


Kind regards, 



Do you think this library will works with connected launchpad TM4C129XL? and where are these pins located? thanks

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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(" ");

Hi, I was following your code and pinout, but it

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Sorry everyone, but i can't debug the code for my kit.

Cause it is a mistake, this is "sketch_step28a.ino:16:21: fatal error : Mfrc522.h: No such file or directory

compilation terminated."


I can't fix it. Pls help me. Tks

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