import mfrc522
from os import uname


def uidToString(uid):
	mystring = ""
	for i in uid:
		mystring = "%02X" % i + mystring
	return mystring
    
def do_read():

	if uname()[0] == 'WiPy':
		rdr = mfrc522.MFRC522("GP14", "GP16", "GP15", "GP22", "GP17")
	elif uname()[0] == 'esp32':
		rdr = mfrc522.MFRC522(sck=18,mosi=23,miso=19,rst=22,cs=21)
	else:
		raise RuntimeError("Unsupported platform")

	print("")
	print("Place card before reader to read from address 0x08")
	print("")

	try:
		while True:

			(stat, tag_type) = rdr.request(rdr.REQIDL)

			if stat == rdr.OK:
        
				(stat, uid) = rdr.SelectTagSN()
        	
				if stat == rdr.OK:
					print("Card detected %s" % uidToString(uid))
				else:
					print("Authentication error")

	except KeyboardInterrupt:
		print("Bye")