From 7cd29b7d775cbf527dea3690201e986802eb7f81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9opold=20Gravier?= <le78ld@gmail.com>
Date: Thu, 15 Feb 2024 19:08:00 +0100
Subject: [PATCH] Removed unused variable key from examples

---
 examples/ChangeUID/ChangeUID.ino               | 7 -------
 examples/FixBrickedUID/FixBrickedUID.ino       | 7 -------
 examples/MinimalInterrupt/MinimalInterrupt.ino | 2 --
 examples/ReadNUID/ReadNUID.ino                 | 8 --------
 4 files changed, 24 deletions(-)

diff --git a/examples/ChangeUID/ChangeUID.ino b/examples/ChangeUID/ChangeUID.ino
index eb7b8c8..82c5665 100644
--- a/examples/ChangeUID/ChangeUID.ino
+++ b/examples/ChangeUID/ChangeUID.ino
@@ -35,19 +35,12 @@ MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance
 /* Set your new UID here! */
 #define NEW_UID {0xDE, 0xAD, 0xBE, 0xEF}
 
-MFRC522::MIFARE_Key key;
-
 void setup() {
   Serial.begin(9600);  // 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
   mfrc522.PCD_Init();  // Init MFRC522 card
   Serial.println(F("Warning: this example overwrites the UID of your UID changeable card, use with care!"));
-  
-  // Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
-  for (byte i = 0; i < 6; i++) {
-    key.keyByte[i] = 0xFF;
-  }
 }
 
 // Setting the UID can be as simple as this:
diff --git a/examples/FixBrickedUID/FixBrickedUID.ino b/examples/FixBrickedUID/FixBrickedUID.ino
index 8530d41..d1f3654 100644
--- a/examples/FixBrickedUID/FixBrickedUID.ino
+++ b/examples/FixBrickedUID/FixBrickedUID.ino
@@ -32,19 +32,12 @@
 
 MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance
 
-MFRC522::MIFARE_Key key;
-
 void setup() {
   Serial.begin(9600);  // 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
   mfrc522.PCD_Init();  // Init MFRC522 card
   Serial.println(F("Warning: this example clears your mifare UID, use with care!"));
-  
-  // Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
-  for (byte i = 0; i < 6; i++) {
-    key.keyByte[i] = 0xFF;
-  }
 }
 
 void loop() {
diff --git a/examples/MinimalInterrupt/MinimalInterrupt.ino b/examples/MinimalInterrupt/MinimalInterrupt.ino
index 37ec436..23273cf 100644
--- a/examples/MinimalInterrupt/MinimalInterrupt.ino
+++ b/examples/MinimalInterrupt/MinimalInterrupt.ino
@@ -37,8 +37,6 @@
 
 MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
 
-MFRC522::MIFARE_Key key;
-
 volatile bool bNewInt = false;
 byte regVal = 0x7F;
 void activateRec(MFRC522 mfrc522);
diff --git a/examples/ReadNUID/ReadNUID.ino b/examples/ReadNUID/ReadNUID.ino
index ffc924e..8e7fd0e 100644
--- a/examples/ReadNUID/ReadNUID.ino
+++ b/examples/ReadNUID/ReadNUID.ino
@@ -38,8 +38,6 @@
  
 MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class
 
-MFRC522::MIFARE_Key key; 
-
 // Init array that will store new NUID 
 byte nuidPICC[4];
 
@@ -48,13 +46,7 @@ void setup() {
   SPI.begin(); // Init SPI bus
   rfid.PCD_Init(); // Init MFRC522 
 
-  for (byte i = 0; i < 6; i++) {
-    key.keyByte[i] = 0xFF;
-  }
-
   Serial.println(F("This code scan the MIFARE Classsic NUID."));
-  Serial.print(F("Using the following key:"));
-  printHex(key.keyByte, MFRC522::MF_KEY_SIZE);
 }
  
 void loop() {