Add src/arduino/writeBytes.ino

src/arduino/writeBytes.ino

@@ -0,0 +1,79 @@
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_PN532.h>
+
+#define PN532_IRQ   (2)
+#define PN532_RESET (3)  // Not connected by default on the NFC Shield
+
+Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET);
+
+void setup(void) {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+
+  Serial.println("Hello!");
+
+  nfc.begin();
+
+  uint32_t versiondata = nfc.getFirmwareVersion();
+  if (!versiondata) {
+    Serial.print("Didn't find PN53x board");
+    while (1);
+  }
+
+  Serial.print("Found chip PN5");
+  Serial.println((versiondata >> 24) & 0xFF, HEX);
+  Serial.print("Firmware ver. ");
+  Serial.print((versiondata >> 16) & 0xFF, DEC);
+  Serial.print('.');
+  Serial.println((versiondata >> 8) & 0xFF, DEC);
+
+  Serial.println("Waiting for an ISO14443A Card ...");
+}
+
+void loop(void) {
+  uint8_t success;
+  uint8_t uid[] = {0, 0, 0, 0, 0, 0, 0};
+  uint8_t uidLength;
+
+  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
+
+  if (success) {
+    Serial.println("Found an ISO14443A card");
+    Serial.print("  UID Length: ");
+    Serial.print(uidLength, DEC);
+    Serial.println(" bytes");
+    Serial.print("  UID Value: ");
+    for (uint8_t i = 0; i < uidLength; i++) {
+      Serial.print(uid[i], HEX);
+      if (i + 1 < uidLength) {
+        Serial.print(", ");
+      }
+    }
+    Serial.println("");
+
+    // Authenticate to write to Block 7
+    uint8_t keya[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+    success = nfc.mifareclassic_AuthenticateBlock(uid, uidLength, 7, 0, keya);
+    
+    if (success) {
+      Serial.println("Authentication successful. Writing to Block 7...");
+
+      // Data to write (replace with your own data)
+      uint8_t data[16] = {0x1C, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+      // Write to Block 7
+      success = nfc.mifareclassic_WriteDataBlock(7, data);
+
+      if (success) {
+        Serial.println("Write successful");
+      } else {
+        Serial.println("Write failed");
+      }
+    } else {
+      Serial.println("Authentication failed");
+    }
+
+    delay(1000);
+  }
+}