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read_rfid_with_rc522.py
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read_rfid_with_rc522.py
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from machine import Pin, SPI
from os import uname
import utime
class RC522:
DEBUG = False
OK = 0
NOTAGERR = 1
ERR = 2
REQIDL = 0x26
REQALL = 0x52
AUTHENT1A = 0x60
AUTHENT1B = 0x61
PICC_ANTICOLL1 = 0x93
PICC_ANTICOLL2 = 0x95
PICC_ANTICOLL3 = 0x97
def __init__(self, sck, mosi, miso, rst, cs, baudrate=1000000, spi_id=0):
self.sck = Pin(sck, Pin.OUT)
self.mosi = Pin(mosi, Pin.OUT)
self.miso = Pin(miso)
self.rst = Pin(rst, Pin.OUT)
self.cs = Pin(cs, Pin.OUT)
self.rst.value(0)
self.cs.value(1)
board = uname()[0]
if board == 'rp2':
self.spi = SPI(spi_id, baudrate=baudrate, sck=self.sck, mosi=self.mosi, miso=self.miso)
else:
raise RuntimeError("Unsupported platform")
self.rst.value(1)
self.init()
def _wreg(self, reg, val):
self.cs.value(0)
self.spi.write(b'%c' % int(0xff & ((reg << 1) & 0x7e)))
self.spi.write(b'%c' % int(0xff & val))
self.cs.value(1)
def _rreg(self, reg):
self.cs.value(0)
self.spi.write(b'%c' % int(0xff & (((reg << 1) & 0x7e) | 0x80)))
val = self.spi.read(1)
self.cs.value(1)
return val[0]
def _sflags(self, reg, mask):
self._wreg(reg, self._rreg(reg) | mask)
def _cflags(self, reg, mask):
self._wreg(reg, self._rreg(reg) & (~mask))
def _tocard(self, cmd, send):
recv = []
bits = irq_en = wait_irq = n = 0
stat = self.ERR
if cmd == 0x0E:
irq_en = 0x12
wait_irq = 0x10
elif cmd == 0x0C:
irq_en = 0x77
wait_irq = 0x30
self._wreg(0x02, irq_en | 0x80)
self._cflags(0x04, 0x80)
self._sflags(0x0A, 0x80)
self._wreg(0x01, 0x00)
for c in send:
self._wreg(0x09, c)
self._wreg(0x01, cmd)
if cmd == 0x0C:
self._sflags(0x0D, 0x80)
i = 2000
while True:
n = self._rreg(0x04)
i -= 1
if not ((i != 0) and not (n & 0x01) and not (n & wait_irq)):
break
self._cflags(0x0D, 0x80)
if i:
if (self._rreg(0x06) & 0x1B) == 0x00:
stat = self.OK
if n & irq_en & 0x01:
stat = self.NOTAGERR
elif cmd == 0x0C:
n = self._rreg(0x0A)
lbits = self._rreg(0x0C) & 0x07
if lbits != 0:
bits = (n - 1) * 8 + lbits
else:
bits = n * 8
if n == 0:
n = 1
elif n > 16:
n = 16
for _ in range(n):
recv.append(self._rreg(0x09))
else:
stat = self.ERR
return stat, recv, bits
def _crc(self, data):
self._cflags(0x05, 0x04)
self._sflags(0x0A, 0x80)
for c in data:
self._wreg(0x09, c)
self._wreg(0x01, 0x03)
i = 0xFF
while True:
n = self._rreg(0x05)
i -= 1
if not ((i != 0) and not (n & 0x04)):
break
return [self._rreg(0x22), self._rreg(0x21)]
def init(self):
self.reset()
self._wreg(0x2A, 0x8D)
self._wreg(0x2B, 0x3E)
self._wreg(0x2D, 30)
self._wreg(0x2C, 0)
self._wreg(0x15, 0x40)
self._wreg(0x11, 0x3D)
self.antenna_on()
def reset(self):
self._wreg(0x01, 0x0F)
def antenna_on(self, on=True):
if on and not (self._rreg(0x14) & 0x03):
self._sflags(0x14, 0x03)
else:
self._cflags(0x14, 0x03)
def request(self, mode):
self._wreg(0x0D, 0x07)
stat, recv, bits = self._tocard(0x0C, [mode])
if stat != self.OK or bits != 0x10:
stat = self.ERR
return stat, bits
def anticoll(self, anticolN):
ser_chk = 0
ser = [anticolN, 0x20]
self._wreg(0x0D, 0x00)
stat, recv, bits = self._tocard(0x0C, ser)
if stat == self.OK:
if len(recv) == 5:
for i in range(4):
ser_chk ^= recv[i]
if ser_chk != recv[4]:
stat = self.ERR
else:
stat = self.ERR
return stat, recv
def SelectTagSN(self):
valid_uid = []
status, uid = self.anticoll(self.PICC_ANTICOLL1)
if status != self.OK:
return self.ERR, []
if self.PcdSelect(uid, self.PICC_ANTICOLL1) == 0:
return self.ERR, []
if uid[0] == 0x88:
valid_uid.extend(uid[1:4])
status, uid = self.anticoll(self.PICC_ANTICOLL2)
if status != self.OK:
return self.ERR, []
if self.PcdSelect(uid, self.PICC_ANTICOLL2) == 0:
return self.ERR, []
if uid[0] == 0x88:
valid_uid.extend(uid[1:4])
status, uid = self.anticoll(self.PICC_ANTICOLL3)
if status != self.OK:
return self.ERR, []
if self.PcdSelect(uid, self.PICC_ANTICOLL3) == 0:
return self.ERR, []
valid_uid.extend(uid[0:5])
return self.OK, valid_uid[:-1]
def PcdSelect(self, serNum, anticolN):
buf = [anticolN, 0x70] + serNum
pOut = self._crc(buf)
buf += pOut
status, backData, backLen = self._tocard(0x0C, buf)
return 1 if status == self.OK and backLen == 0x18 else 0
if __name__ == "__main__":
reader = RC522(spi_id=0, sck=2, miso=4, mosi=3, cs=1, rst=0)
last_card_id = None
i = 0
print("scanning ...\n")
while True:
reader.init()
stat, tag_type = reader.request(reader.REQIDL)
if stat == reader.OK:
stat, uid = reader.SelectTagSN()
if stat == reader.OK:
card = int.from_bytes(bytes(uid), "little", False)
if card != last_card_id:
print("CARD ID: " + str(card))
last_card_id = card
utime.sleep_ms(100)
i = i+1
if i > 1000:
last_card_id = None