fix blocking when tag is on the reader for some time, fix was taken from calvinzirk/pi-rc522

Author: layereight

pirc522/rfid.py

@@ -395,6 +395,11 @@ def wait_for_tag(self):
         # wait for it
         waiting = True
         while waiting:
+            self.init()
+            #self.irq.clear()
+            self.dev_write(0x04, 0x00)
+            self.dev_write(0x02, 0xA0)
+
             self.dev_write(0x09, 0x26)
             self.dev_write(0x01, 0x0C)
             self.dev_write(0x0D, 0x87)