upm/examples/python/pn532.py

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#!/usr/bin/env python
# Author: Zion Orent <zorent@ics.com>
# Copyright (c) 2015 Intel Corporation.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
from __future__ import print_function
import time, sys, signal, atexit
from upm import pyupm_pn532 as upmPn532
def main():
# Instantiate an PN532 on I2C bus 0 (default) using gpio 3 for the
# IRQ, and gpio 2 for the reset pin.
myNFC = upmPn532.PN532(3, 2)
## Exit handlers ##
# This stops python from printing a stacktrace when you hit control-C
def SIGINTHandler(signum, frame):
raise SystemExit
# This lets you run code on exit
def exitHandler():
print("Exiting")
sys.exit(0)
# Register exit handlers
atexit.register(exitHandler)
signal.signal(signal.SIGINT, SIGINTHandler)
if (not myNFC.init()):
print("init() failed")
sys.exit(0)
vers = myNFC.getFirmwareVersion()
if (vers):
print("Got firmware version: %08x" % vers)
else:
print("Could not identify PN532")
sys.exit(0)
# Now scan and identify any cards that come in range (1 for now)
# Retry forever
myNFC.setPassiveActivationRetries(0xff)
myNFC.SAMConfig()
uidSize = upmPn532.uint8Array(0)
uid = upmPn532.uint8Array(7)
while (1):
for i in range(7):
uid.__setitem__(i, 0)
if (myNFC.readPassiveTargetID(upmPn532.PN532.BAUD_MIFARE_ISO14443A,
uid, uidSize, 2000)):
# found a card
print("Found a card: UID len", uidSize.__getitem__(0))
print("UID: ", end=' ')
for i in range(uidSize.__getitem__(0)):
print("%02x" % uid.__getitem__(i), end=' ')
print()
print("SAK: %02x" % myNFC.getSAK())
print("ATQA: %04x" % myNFC.getATQA())
print()
time.sleep(1)
else:
print("Waiting for a card...\n")
if __name__ == '__main__':
main()