vanipm / adafruit-pn532

Arduino library for SPI and I2C access to the PN532 RFID/Near Field Communication chip

Adafruit-PN532

This is a library 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 I2C or SPI to communicate.

Compatibility

MCU	Tested Works	Doesn't Work	Not Tested	Notes
Atmega328 @ 16MHz	X			SPI & I2C Works
Atmega328 @ 12MHz	X			SPI & I2C Works
Atmega32u4 @ 16MHz	X			Follow instructions at https://learn.adafruit.com/adafruit-pn532-rfid-nfc/shield-wiring#using-with-the-arduino-leonardo-and-yun to move pin 2.
Atmega32u4 @ 8MHz	X			SPI & I2C Works
ESP8266		X		SPI only, I2C clock stretching not supported
ESP32	X			SPI works; I2C works using IRQ and without sharing the I2C bus.
Atmega2560 @ 16MHz	X			SPI & I2C Works
ATSAM3X8E	X			SPI & I2C Works
ATSAM21D		X		SPI only, I2C clock stretching not supported. Use programming port.
ATtiny85 @ 16MHz			X
ATtiny85 @ 8MHz			X
Intel Curie @ 32MHz			X
STM32F2			X

• ATmega328 @ 16MHz : Arduino UNO, Adafruit Pro Trinket 5V, Adafruit Metro 328, Adafruit Metro Mini
• ATmega328 @ 12MHz : Adafruit Pro Trinket 3V
• ATmega32u4 @ 16MHz : Arduino Leonardo, Arduino Micro, Arduino Yun, Teensy 2.0
• ATmega32u4 @ 8MHz : Adafruit Flora, Bluefruit Micro
• ESP8266 : Adafruit Huzzah
• ESP32 : WROOM
• ATmega2560 @ 16MHz : Arduino Mega
• ATSAM3X8E : Arduino Due
• ATSAM21D : Arduino Zero, M0 Pro
• ATtiny85 @ 16MHz : Adafruit Trinket 5V
• ATtiny85 @ 8MHz : Adafruit Gemma, Arduino Gemma, Adafruit Trinket 3V

Dependencies

• Adafruit_BusIO

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Documentation and doxygen

Documentation is produced by doxygen. Contributions should include documentation for any new code added.

Some examples of how to use doxygen can be found in these guide pages:

https://learn.adafruit.com/the-well-automated-arduino-library/doxygen

https://learn.adafruit.com/the-well-automated-arduino-library/doxygen-tips

Formatting and clang-format

This library uses clang-format to standardize the formatting of .cpp and .h files. Contributions should be formatted using clang-format:

The -i flag will make the changes to the file.

clang-format -i *.cpp *.h

If you prefer to make the changes yourself, running clang-format without the -i flag will print out a formatted version of the file. You can save this to a file and diff it against the original to see the changes.

Note that the formatting output by clang-format is what the automated formatting checker will expect. Any diffs from this formatting will result in a failed build until they are addressed. Using the -i flag is highly recommended.

clang-format resources

• Binary builds and source available on the LLVM downloads page
• Documentation and IDE integration Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!

Written by Limor Fried/Ladyada & Kevin Townsend for Adafruit Industries.
BSD license, check license.txt for more information All text above must be included in any redistribution

To install, use the Arduino Library Manager and search for "Adafruit PN532" and install the library. Adafruit BusIO library is also required