70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
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# SPDX-License-Identifier: MIT
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"""
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This example shows connecting to the PN532 with I2C (requires clock
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stretching support), SPI, or UART. SPI is best, it uses the most pins but
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is the most reliable and universally supported. In this example, we also connect
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IRQ and poll that pin for a card. We don't try to read the card until we know
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there is one present. After initialization, try waving various 13.56MHz RFID
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cards over it!
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"""
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import time
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import board
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import busio
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from digitalio import DigitalInOut
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#
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# NOTE: pick the import that matches the interface being used
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#
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from adafruit_pn532.i2c import PN532_I2C
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# from adafruit_pn532.spi import PN532_SPI
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# from adafruit_pn532.uart import PN532_UART
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# I2C connection:
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i2c = busio.I2C(board.SCL, board.SDA)
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# Non-hardware
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# pn532 = PN532_I2C(i2c, debug=False)
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# With I2C, we recommend connecting RSTPD_N (reset) to a digital pin for manual
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# harware reset
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reset_pin = DigitalInOut(board.D6)
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# On Raspberry Pi, you must also connect a pin to P32 "H_Request" for hardware
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# wakeup! this means we don't need to do the I2C clock-stretch thing
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req_pin = DigitalInOut(board.D12)
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# Using the IRQ pin allows us to determine when a card is present by checking
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# to see if the pin is pulled low.
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irq_pin = DigitalInOut(board.D10)
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pn532 = PN532_I2C(i2c, debug=False, reset=reset_pin, req=req_pin, irq=irq_pin)
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# SPI connection:
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# spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
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# cs_pin = DigitalInOut(board.D5)
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# pn532 = PN532_SPI(spi, cs_pin, debug=False)
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# UART connection
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# uart = busio.UART(board.TX, board.RX, baudrate=115200, timeout=0.1)
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# pn532 = PN532_UART(uart, debug=False)
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ic, ver, rev, support = pn532.firmware_version
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print("Found PN532 with firmware version: {0}.{1}".format(ver, rev))
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# Configure PN532 to communicate with MiFare cards
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pn532.SAM_configuration()
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# Start listening for a card
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pn532.listen_for_passive_target()
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print("Waiting for RFID/NFC card...")
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while True:
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# Check if a card is available to read
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if irq_pin.value == 0:
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uid = pn532.get_passive_target()
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print("Found card with UID:", [hex(i) for i in uid])
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# Start listening for a card again
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pn532.listen_for_passive_target()
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else:
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print(".", end="")
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time.sleep(0.1)
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