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authorkrolyxon <me@krolyxon.com>2026-06-08 23:12:15 +0530
committerkrolyxon <me@krolyxon.com>2026-06-08 23:12:15 +0530
commit8a4d103196312b8a18afc0a2ba0fc13ff1a0b180 (patch)
treea92424ac65fbdb93702ea8c44a5c52c9fd66e28c /.pio/libdeps/esp32-s3-n16r8/Adafruit PN532/examples/readMifareClassic
parent1d557527be495c59bbc07f194d903b1cec1780d3 (diff)
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-/**************************************************************************/
-/*!
- @file readMifareClassic.pde
- @author Adafruit Industries
- @license BSD (see license.txt)
-
- This example will wait for any ISO14443A card or tag, and
- depending on the size of the UID will attempt to read from it.
-
- If the card has a 4-byte UID it is probably a Mifare
- Classic card, and the following steps are taken:
-
- Reads the 4 byte (32 bit) ID of a MiFare Classic card.
- Since the classic cards have only 32 bit identifiers you can stick
- them in a single variable and use that to compare card ID's as a
- number. This doesn't work for ultralight cards that have longer 7
- byte IDs!
-
- Note that you need the baud rate to be 115200 because we need to
- print out the data and read from the card at the same time!
-
-This is an example sketch for the Adafruit PN532 NFC/RFID breakout boards
-This library works with the Adafruit NFC breakout
- ----> https://www.adafruit.com/products/364
-
-Check out the links above for our tutorials and wiring diagrams
-These chips use SPI to communicate, 4 required to interface
-
-Adafruit invests time and resources providing this open source code,
-please support Adafruit and open-source hardware by purchasing
-products from Adafruit!
-*/
-/**************************************************************************/
-#include <Wire.h>
-#include <SPI.h>
-#include <Adafruit_PN532.h>
-
-// If using the breakout with SPI, define the pins for SPI communication.
-#define PN532_SCK (2)
-#define PN532_MOSI (3)
-#define PN532_SS (4)
-#define PN532_MISO (5)
-
-// If using the breakout or shield with I2C, define just the pins connected
-// to the IRQ and reset lines. Use the values below (2, 3) for the shield!
-#define PN532_IRQ (2)
-#define PN532_RESET (3) // Not connected by default on the NFC Shield
-
-// Uncomment just _one_ line below depending on how your breakout or shield
-// is connected to the Arduino:
-
-// Use this line for a breakout with a SPI connection:
-Adafruit_PN532 nfc(PN532_SCK, PN532_MISO, PN532_MOSI, PN532_SS);
-
-// Use this line for a breakout with a hardware SPI connection. Note that
-// the PN532 SCK, MOSI, and MISO pins need to be connected to the Arduino's
-// hardware SPI SCK, MOSI, and MISO pins. On an Arduino Uno these are
-// SCK = 13, MOSI = 11, MISO = 12. The SS line can be any digital IO pin.
-//Adafruit_PN532 nfc(PN532_SS);
-
-// Or use this line for a breakout or shield with an I2C connection:
-//Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET);
-
-void setup(void) {
- Serial.begin(115200);
- while (!Serial) delay(10); // for Leonardo/Micro/Zero
-
- Serial.println("Hello!");
-
- nfc.begin();
-
- uint32_t versiondata = nfc.getFirmwareVersion();
- if (! versiondata) {
- Serial.print("Didn't find PN53x board");
- while (1); // halt
- }
- // Got ok data, print it out!
- 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 }; // Buffer to store the returned UID
- uint8_t uidLength; // Length of the UID (4 or 7 bytes depending on ISO14443A card type)
-
- // Wait for an ISO14443A type cards (Mifare, etc.). When one is found
- // 'uid' will be populated with the UID, and uidLength will indicate
- // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
- success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
-
- if (success) {
- // Display some basic information about the card
- Serial.println("Found an ISO14443A card");
- Serial.print(" UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
- Serial.print(" UID Value: ");
- nfc.PrintHex(uid, uidLength);
-
- if (uidLength == 4)
- {
- // We probably have a Mifare Classic card ...
- uint32_t cardid = uid[0];
- cardid <<= 8;
- cardid |= uid[1];
- cardid <<= 8;
- cardid |= uid[2];
- cardid <<= 8;
- cardid |= uid[3];
- Serial.print("Seems to be a Mifare Classic card #");
- Serial.println(cardid);
- }
- Serial.println("");
- }
-}
-