Merge pull request #143 from lmmeng/master

New constructor and PCD_Init() method to allow defining arrays of rea…

MFRC522.cpp

@@ -10,6 +10,11 @@
 /////////////////////////////////////////////////////////////////////////////////////
 // Functions for setting up the Arduino
 /////////////////////////////////////////////////////////////////////////////////////
+/**
+ * Constructor.
+ */
+MFRC522::MFRC522() {
+} // End constructor
 
 /**
  * Constructor.
@@ -216,6 +221,18 @@ void MFRC522::PCD_Init() {
 	PCD_AntennaOn();						// Enable the antenna driver pins TX1 and TX2 (they were disabled by the reset)
 } // End PCD_Init()
 
+/**
+ * Initializes the MFRC522 chip.
+ */
+void MFRC522::PCD_Init(	byte chipSelectPin,		///< Arduino pin connected to MFRC522's SPI slave select input (Pin 24, NSS, active low)
+		        byte resetPowerDownPin	///< Arduino pin connected to MFRC522's reset and power down input (Pin 6, NRSTPD, active low)
+		      ) {
+	_chipSelectPin = chipSelectPin;
+	_resetPowerDownPin = resetPowerDownPin; 
+	// Set the chipSelectPin as digital output, do not select the slave yet
+	PCD_Init();
+} // End PCD_Init()
+
 /**
  * Performs a soft reset on the MFRC522 chip and waits for it to be ready again.
  */

MFRC522.h

@@ -319,6 +319,7 @@ public:
 	/////////////////////////////////////////////////////////////////////////////////////
 	// Functions for setting up the Arduino
 	/////////////////////////////////////////////////////////////////////////////////////
+        MFRC522();
 	MFRC522(byte chipSelectPin, byte resetPowerDownPin);
 	void setSPIConfig();
 	
@@ -338,6 +339,7 @@ public:
 	// Functions for manipulating the MFRC522
 	/////////////////////////////////////////////////////////////////////////////////////
 	void PCD_Init();
+	void PCD_Init(byte chipSelectPin, byte resetPowerDownPin);
 	void PCD_Reset();
 	void PCD_AntennaOn();
 	void PCD_AntennaOff();

examples/ReadUidMultiReader/ReadUidMultiReader.ino

@@ -0,0 +1,94 @@
+/**
+ * ----------------------------------------------------------------------------
+ * This is a MFRC522 library example; see https://github.com/miguelbalboa/rfid
+ * for further details and other examples.
+ *
+ * NOTE: The library file MFRC522.h has a lot of useful info. Please read it.
+ *
+ * Released into the public domain.
+ * ----------------------------------------------------------------------------
+ * This sample shows how to read and write data blocks on a MIFARE Classic PICC
+ * (= card/tag).
+ *
+ * BEWARE: Data will be written to the PICC, in sector #1 (blocks #4 to #7).
+ *
+ *
+ * Typical pin layout used:
+ * -----------------------------------------------------------------------------------------
+ *             MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
+ *             Reader/PCD   Uno           Mega      Nano v3    Leonardo/Micro   Pro Micro
+ * Signal      Pin          Pin           Pin       Pin        Pin              Pin
+ * -----------------------------------------------------------------------------------------
+ * RST/Reset   RST          9             5         D9         RESET/ICSP-5     RST
+ * SPI SS 1    SDA(SS)      10            53        D10        10               10
+ * SPI SS 2    SDA(SS)      2             53        D10        10               10
+ * SPI MOSI    MOSI         11 / ICSP-4   51        D11        ICSP-4           16
+ * SPI MISO    MISO         12 / ICSP-1   50        D12        ICSP-1           14
+ * SPI SCK     SCK          13 / ICSP-3   52        D13        ICSP-3           15
+ *
+ */
+
+#include <SPI.h>
+#include <MFRC522.h>
+
+#define RST_PIN        10           // Configurable, see typical pin layout above
+#define SS_1_PIN        5          // Configurable, see typical pin layout above
+#define SS_2_PIN        3          // Configurable, see typical pin layout above
+
+#define NR_OF_READERS   2
+
+byte ssPins[] = {SS_1_PIN, SS_2_PIN};
+
+MFRC522 mfrc522[NR_OF_READERS];   // Create MFRC522 instance.
+
+/**
+ * Initialize.
+ */
+void setup() {
+
+  Serial.begin(115200); // Initialize serial communications with the PC
+  while (!Serial);    // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
+
+  SPI.begin();        // Init SPI bus
+
+  for (uint8_t reader = 0; reader < NR_OF_READERS; reader++) {
+    mfrc522[reader].PCD_Init(ssPins[reader], RST_PIN); // Init each MFRC522 card
+  }
+}
+
+/**
+ * Main loop.
+ */
+void loop() {
+
+    for (uint8_t reader = 0; reader < NR_OF_READERS; reader++) {
+    // Look for new cards
+
+    if (mfrc522[reader].PICC_IsNewCardPresent() && mfrc522[reader].PICC_ReadCardSerial()) {
+      Serial.print(F("Reader: "));
+      Serial.print(reader);
+      // Show some details of the PICC (that is: the tag/card)
+      Serial.print(F(" Card UID:"));
+      dump_byte_array(mfrc522[reader].uid.uidByte, mfrc522[reader].uid.size);
+      Serial.println();
+      Serial.print(F("PICC type: "));
+      byte piccType = mfrc522[reader].PICC_GetType(mfrc522[reader].uid.sak);
+      Serial.println(mfrc522[reader].PICC_GetTypeName(piccType));
+
+      // Halt PICC
+      mfrc522[reader].PICC_HaltA();
+      // Stop encryption on PCD
+      mfrc522[reader].PCD_StopCrypto1();
+    } //if (mfrc522[reader].PICC_IsNewC
+  } //for(uint8_t reader
+}
+
+/**
+ * Helper routine to dump a byte array as hex values to Serial.
+ */
+void dump_byte_array(byte *buffer, byte bufferSize) {
+  for (byte i = 0; i < bufferSize; i++) {
+    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
+    Serial.print(buffer[i], HEX);
+  }
+}