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arduino-cli/libraries/MFRC522/examples/FixBrickedUID/FixBrickedUID.ino

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+/*
+ * --------------------------------------------------------------------------------------------------------------------
+ * Example sketch/program to fix a broken UID changeable MIFARE cards.
+ * --------------------------------------------------------------------------------------------------------------------
+ * This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
+ * 
+ * This sample shows how to fix a broken UID changeable MIFARE cards that have a corrupted sector 0.
+ * 
+ * @author Tom Clement
+ * @license Released into the public domain.
+ * 
+ * Typical pin layout used:
+ * -----------------------------------------------------------------------------------------
+ *             MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
+ *             Reader/PCD   Uno/101       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      SDA(SS)      10            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   9     // Configurable, see typical pin layout above
+#define SS_PIN    10    // Configurable, see typical pin layout above
+
+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() {
+  if ( mfrc522.MIFARE_UnbrickUidSector(false) ) {
+    Serial.println(F("Cleared sector 0, set UID to 1234. Card should be responsive again now."));
+  }
+  delay(1000);
+}