77 lines
2.2 KiB
Python
77 lines
2.2 KiB
Python
# SPDX-FileCopyrightText: 2015 Tony DiCola and Roberto Laricchia for Adafruit Industries
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# SPDX-License-Identifier: MIT
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# Example of detecting and reading a block from a MiFare NFC card.
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"""
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This example shows connecting to the PN532 and writing & reading an ntag2xx
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type RFID tag
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"""
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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 reset/request with I2C
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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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# pn532 = PN532_I2C(i2c, debug=False, reset=reset_pin, req=req_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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print("Waiting for RFID/NFC card to write to!")
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while True:
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# Check if a card is available to read
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uid = pn532.read_passive_target(timeout=0.5)
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print(".", end="")
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# Try again if no card is available.
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if uid is not None:
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break
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print("")
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print("Found card with UID:", [hex(i) for i in uid])
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# Set 4 bytes of block to 0xFEEDBEEF
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data = bytearray(4)
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data[0:4] = b"\xFE\xED\xBE\xEF"
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# Write 4 byte block.
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pn532.ntag2xx_write_block(6, data)
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# Read block #6
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ntag2xx_block = pn532.ntag2xx_read_block(6)
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if ntag2xx_block is not None:
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print(
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"Wrote to block 6, now trying to read that data:",
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[hex(x) for x in ntag2xx_block],
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)
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else:
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print("Read failed - did you remove the card?")
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