02c063079a
This adds support to break the `read_passive_target` function up into two parts if desired. First tell the PN532 to listen for tags, and then explicitly ask to read the UID from the tag. This can be useful when trying to simultaneously scan tags and run timing sensitive code, like updating neopixels, and don't want to wait for the timeout delay of `read_passive_target`.
67 lines
2.2 KiB
Python
67 lines
2.2 KiB
Python
"""
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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=100)
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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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