esp-idf-rc522

This repository contains ESP-IDF library (component) for communication with RFID cards using MFRC522 reader.

Library takes care of polling the cards and managing the card lifecycle. It also fires events when a card is detected, removed, or when the card changes to any state described in ISO-14443. Additionally, it provides an API for reading and writing to card memory blocks.

Installation

To install latest version of this component to your project, run:

idf.py add-dependency "abobija/rc522"

Support

• Cards: MIFARE 1K, MIFARE 4K and MIFARE Mini
• Card operations:
  • Read and write to memory blocks (example)
• Communication protocols: SPI and I2C
• ESP-IDF version: ^5

Example

Tip

To find more interesting examples (like memory_dump), go to examples folder.

To run basic example, create it as follows:

idf.py create-project-from-example "abobija/rc522:basic"

Then build and flash it as usual:

cd basic
idf.py build flash monitor

Note

basic example uses SPI communication. Find defined GPIO configuration in basic.c file.

Pin Layout

Pin layout is configurable by the user. To configure the GPIOs, check the #define statements in the basic example. If you are not using the RST pin, you can connect it to the 3.3V.

Unit testing

To run unit tests, go to test directory and set target to linux:

cd test
idf.py --preview set-target linux

Then build the project and run tests:

idf.py build && ./build/test.elf

Terms

Term	Description
PCD	Proximity Coupling Device (the card reader). In our case this is MFRC522 module
PICC	Proximity Integrated Circuit Card (e.g: rfid card, tag, ...)

Additional resources

Title	Description
ISO/IEC 14443	Identification cards - Contactless integrated circuit cards
ISO/IEC 14443-2	Radio frequency power and signal interface
ISO/IEC 14443-3	Initialization and anticollision
ISO/IEC 14443-4	Transmission protocol
MFRC522	MFRC522 - Standard performance MIFARE and NTAG frontend
AN10833	MIFARE type identification procedure
AN10834	MIFARE ISO/IEC 14443 PICC selection
MF1S50YYX_V1	MIFARE Classic EV1 1K
MF1S70YYX_V1	MIFARE Classic EV1 4K

License

This component is provided under Apache 2.0 license, see LICENSE file for details.