def poll_loop(self):
"""
Poll for presence of tag, read data, until stop() is called.
"""
# initialize music mixer
pygame.mixer.init()
# set default volume
util.set_volume(settings.DEFAULT_VOLUME)
while not self.do_stop:
with self.mutex:
# initialize tag state
self.uid[0] = None
self.data[0] = None
# always create a new RFID interface instance, to clear any errors from previous operations
rdr = RFID()
# check for presence of tag
err, _ = rdr.request()
if not err:
logger.debug("RFIDHandler poll_loop: Tag is present")
# tag is present, get UID
err, uid = rdr.anticoll()
if not err:
logger.debug(f"RFIDHandler poll_loop: Read UID: {uid}")
# read data
err, data = rdr.read(self.page)
if not err:
logger.debug(
f"RFIDHandler poll_loop: Read tag data: {data}"
)
# all good, store data to shared mem
for i in range(5):
self.uid[i] = uid[i]
for i in range(16):
self.data[i] = data[i]
else:
logger.debug(
"RFIDHandler poll_loop: Error returned from read()"
)
else:
logger.debug(
"RFIDHandler poll_loop: Error returned from anticoll()"
)
# clean up
rdr.cleanup()
# act on data
self.action()
# wait a bit (this is in while loop, NOT in mutex env)
time.sleep(self.sleep)
break
else:
block = block + 1
result = ascii_to_str(result)
return result
while True:
print('Please type mode:')
mode = input()
rdr.wait_for_tag()
(error, tag_type) = rdr.request()
if not error:
print("Tag detected")
(error, uid) = rdr.anticoll()
if not error:
print("UID: " + str(uid))
if not rdr.select_tag(uid):
if not rdr.card_auth(rdr.auth_a, 10,
[0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
uid):
if mode == 'r':
print("Reading: " + read_from_rfid(NAME_BLOCK))
# Always stop crypto1 when done working
rdr.stop_crypto()
else:
write_to_rfif('1221', NAME_BLOCK)
rdr.stop_crypto()
# Calls GPIO cleanup
def write(self, data):
"""
Write a 16-byte string of data to the tag
"""
if len(data) != 16:
logger.debug(f"Illegal data length, expected 16, got {len(data)}")
return False
with self.mutex:
rdr = RFID()
success = False
# check for presence of tag
err, _ = rdr.request()
if not err:
logger.debug("RFIDHandler write: Tag is present")
# tag is present, get UID
err, uid = rdr.anticoll()
if not err:
logger.debug("RFIDHandler write: Read UID: " + str(uid))
# write data: RFID lib writes 16 bytes at a time, but for NTAG213
# only the first four are actually written
err = False
for i in range(4):
page = self.page + i
page_data = [ord(c)
for c in data[4 * i:4 * i + 4]] + [0] * 12
# read data once (necessary for successful writing?)
err_read, _ = rdr.read(page)
if err:
logger.debug(
"Error signaled on reading page {:d} before writing"
.format(page))
# write data
err |= rdr.write(page, page_data)
if err:
logger.debug(
f'Error signaled on writing page {page:d} with data {page_data:s}'
)
if not err:
logger.debug(
"RFIDHandler write: successfully wrote tag data")
success = True
else:
logger.debug(
"RFIDHandler write: Error returned from write()")
else:
logger.debug(
"RFIDHandler write: Error returned from anticoll()")
# clean up
rdr.cleanup()
return success