101 lines
2.8 KiB
Python
101 lines
2.8 KiB
Python
# SPDX-FileCopyrightText: <text> 2015 Tony DiCola, Roberto Laricchia,
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# and Francesco Crisafulli, for Adafruit Industries </text>
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# SPDX-License-Identifier: MIT
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# Example of detecting and reading a value block from a MiFare classic NFC card.
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"""
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This example shows connecting to the PN532 and writing & reading a mifare classic
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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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# Additional import needed for I2C/SPI
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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.adafruit_pn532 import MIFARE_CMD_AUTH_B
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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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key_a = b"\xFF\xFF\xFF\xFF\xFF\xFF"
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key_b = b"\xFF\xFF\xFF\xFF\xFF\xFF"
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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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print("Authenticating block 4 ...")
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authenticated = pn532.mifare_classic_authenticate_block(
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uid, 4, MIFARE_CMD_AUTH_B, key_b
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)
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if not authenticated:
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print("Authentication failed!")
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# Format block and set initial balance of 100
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response = pn532.mifare_classic_fmt_value_block(4, 100)
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print(
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response,
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"Formatted block 4, balance is:",
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pn532.mifare_classic_get_value_block(4),
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)
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response = pn532.mifare_classic_sub_value_block(4, 50)
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print(
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response,
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"Decrease by 50, new balance:",
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pn532.mifare_classic_get_value_block(4),
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)
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response = pn532.mifare_classic_add_value_block(4, 1337)
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print(
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response,
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"Increase by 1337, new balance:",
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pn532.mifare_classic_get_value_block(4),
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)
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