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I'm trying to use mfrc522 with gtk3 on an RPi 3B+ with raspbian stretch. Code is

require 'gtk3'
require 'mfrc522'

win = Gtk::Window.new
win.window_position = :center
win.border_width = 5

win.signal_connect("destroy") { Gtk.main_quit }

rfid = MFRC522.new

win.show_all
Gtk.main

If I comment rfid = MFRC522.new gtk window is displayed. If I uncomment, execution blocks on rfid = MFRC522.new

mfrc522 code on console (without gtk) to read uid works well

Thank you for making this library!

I am working on PN532 but it is very useful.

Hello, my connections are:
MFRC522 physical RPI3 pin
sda 24
sck 23
mosi 19
miso 21
irq not connected
gnd 6
rst 18
3.3V 1

and my test script:

require 'mfrc522'
r = MFRC522.new
print(r.picc_request(MFRC522::PICC_REQA)) # returns true
uid, sak = r.picc_select # always raises UnexpectedDataError

However, it works well with pi-rc522 (python), changing connections
irq 18
rst 22

Not sure if this project is still active, stuck how to troubleshoot timeout error.

Setup is working with python code and setup

I did figure out to update nrstpd to 25 based on above setup.

Error I am seeing when running

require 'mfrc522'
require 'securerandom'

r = MFRC522.new(25)

begin
  r.picc_request(MFRC522::PICC_REQA)
  uid, sak = r.picc_select
  puts "uid: #{uid}"
rescue CommunicationError => e
  abort "Error communicating PICC: #{e.message}"
end

Error communicating PICC: status_picc_timeout

Do you happen to have an example project using AES encryption with Desfire cards?

Sometimes I got following error when reading a card

mfrc522-1.0.4/lib/mfrc522.rb:259:in `^': nil can't be coerced into Fixnum (TypeError)

Maybe there should be a error handler to handle this issue?