mkirchner/libmfrc522

MFRC22 C library

libmfrc522

Raspberry PI C library for MFRC522, derived from the C++ version here and based on the bcm2835 library here. Includes a C example program read.c to read RFID cards.

Installation

Install bcm2835

Fetch the tar-file and install it:

tar zxvf bcm2835-1.xx.tar.gz
cd bcm2835-1.xx
./configure --prefix=/opt  # or whatever your preference
make
sudo make check
sudo make install

Build libmfrc522:

gcc -o rfid mfrc522.c read.c -std=c11 -lbcm2835 -L/opt/bcm2835/lib -I/opt/bcm2835/include

Run

Make sure you run as root, then:

sudo ./rfid

Pin Layout

The following table shows the pin layout used:

+-----------+----------+-------------+
|           | MFRC522  | Raspberry Pi|
+-----------+----------+-------------+
| Signal    | Pin      | Pin         |
+===========+==========+=============+
| RST/Reset | RST      | 22          |
+-----------+----------+-------------+
| SPI SS    | SDA      | 24          |
+-----------+----------+-------------+
| SPI MOSI  | MOSI     | 19          |
+-----------+----------+-------------+
| SPI MISO  | MISO     | 21          |
+-----------+----------+-------------+
| SPI SCK   | SCK      | 23          |
+-----------+----------+-------------+
| 3V        | 3v       | 1           |
+-----------+----------+-------------+
| GND       | GND      | 25          |
+-----------+----------+-------------+