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if command == self.PCD_TRANSCEIVE:
self.SetBitMask(self.BitFramingReg, 0x80)

i = 2000
while True:
n = self.Read_MFRC522(self.CommIrqReg)
i = i - 1
if ~((i!=0) and ~(n&0x01) and ~(n&waitIRq)):
break

self.ClearBitMask(self.BitFramingReg, 0x80)

if i != 0:
if (self.Read_MFRC522(self.ErrorReg) & 0x1B)==0x00:
status = self.MI_OK
if n & irqEn & 0x01:
status = self.MI_NOTAGERR

if command == self.PCD_TRANSCEIVE:
n = self.Read_MFRC522(self.FIFOLevelReg)
lastBits = self.Read_MFRC522(self.ControlReg) & 0x07
if lastBits != 0:
backLen = (n-1)*8 + lastBits
else:
backLen = n*8

if n == 0:
n = 1
if n > self.MAX_LEN:
n = self.MAX_LEN

i = 0
while i<n:
backData.append(self.Read_MFRC522(self.FIFODataReg))
i = i + 1;
else:
status = self.MI_ERR
return (status,backData,backLen)

def MFRC522_Request(self, reqMode):
status = None
backBits = None
TagType = []

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