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Add HW,FW notes on NFC assembly
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Tau
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doc/nfc.txt
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244
doc/nfc.txt
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N.B. Quoted strings are NOT NUL-terminated unless otherwise noted.
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Useful reading: https://www.nxp.com/docs/en/data-sheet/MF1S50YYX_V1.pdf
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(AiMe branded cards are Mifare Classic cards. Other technologies exist though)
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Summary
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-------
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Hardware:
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Assembly connector:
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5V Host in
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Tx;Rx;GND Host RS232 in
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Tx;Rx;GND Daisy-chain out
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Main board (probably LED controller):
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Silk "837-15084"
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CN1: Host 5V power in, ?V NFC-sub power out
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CN2: Host RS232 Tx;Rx;GND in, NFC-sub Tx;Rx out
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CN3: LED-Sub power and data(?) out
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DIPSW1: Set to hex nibble 8.
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Contains ADM3222 RS232 transceiver IC
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Contains ATMega32 MCU
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NFC subboard:
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Sticker: Model "TN32MSEC003S"
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CN1: ?V power and Tx;Rx;GND in, Tx;Rx;GND ass'y CN daisy out.
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DIPSW1: Set to hex nibble 0.
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Contains ATmega168 MCU
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Contains ADM3202A RS232 transceiver IC
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Contains shielded RF circuit
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Entire non-ground-plane PCB area is visible through the chassis
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torx screws lol
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LED subboard:
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Silk: "837-15120"
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CN1: ?V power and Tx;Rx;GND in.
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Five RGB LEDs and a bunch of resistors
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No visible logic ICs..?
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No DIPSW.
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JVS framing:
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E0 sync
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D0 escape (+1 to unescape)
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Checksum is sum of bytes after unescaping
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Frame header:
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Frame length (including length byte itself)
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Address
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Sequence no, hopefully loops before hitting esc byte...
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Command byte
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Bus addressing:
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Low nibble set using DIPSWs
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High nibble ???
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Daisy chaining mechanism unknown (RS232 wires probably multi-tap)
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Startup
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-------
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Addr 00 Command 62:
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Req:
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00 Payload length
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Resp:
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00 Status byte
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00 Payload length
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Description:
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Unknown. Reset?
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Addr 00 Command 30:
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Req:
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00 Payload length
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Resp:
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00 Status byte
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17 Payload length
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.. "TN32MSEC003S F/W Ver1.2E"
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Description:
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Get firmware version
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Addr 00 Command 32:
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Req:
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00 Payload length
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Resp:
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00 Status byte
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17 Payload length
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.. "TN32MSEC003S H/W Ver3.0J"
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Description:
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Get hardware version
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Addr 08 Command f5:
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Req:
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00 Payload length
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Resp:
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00 Status byte
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00 Payload length
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Description:
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LED sub-board reset.
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Won't accept LED commands until you do this.
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Addr 08 Command f0:
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Req:
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00 Payload length
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Resp:
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00 Status byte
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09 Payload length
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.. "15084" (part nr for LED board)
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FF ??
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11 ??
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00 ??
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12 ??
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Description:
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Get board "info"
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Addr 00 Command 54:
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Req:
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06 Payload length
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57 'W'
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43 'C'
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43 'C'
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46 'F'
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76 'v'
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32 '2'
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Resp:
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00 Status byte?
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00 ??
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Description:
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Set Mifare KeyA.
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"WCCF" might refer this this SEGA arcade game:
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https://en.wikipedia.org/wiki/World_Club_Champion_Football
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It's quite old and has AiMe readers, maybe where they first appeared?
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Addr 00 Command 50:
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Req:
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06 Payload length
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60 ??
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90 ??
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D0 ?? (This is escaped of course)
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06 ??
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32 ??
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F5 ??
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Resp:
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00 Status byte
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00 Payload length
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Description:
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Possibly Mifare KeyB.
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Polling
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-------
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Addr 00 Command 40:
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Req:
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01 Payload length
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03 ??
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Resp:
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00 Status byte
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00 Payload length
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Description:
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Poll some other NFC technology?
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Addr 00 Command 42:
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Req:
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00 Payload length
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Resp if no MiFare card:
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00 Status byte
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01 Payload length
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00 (represents nothing i guess)
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Resp if MiFare card:
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00 Status byte?
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07 Payload length
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01 Chunk length?
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10 ?? Block size maybe?
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04 Chunk length?
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.. Mifare UID, four bytes.
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Description:
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Check for Mifare card presence?
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Addr 00 Command 41:
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Req:
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00 Payload length
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Resp:
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00 Status byte
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00 Payload length
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Description:
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Unknown. Poll some other NFC technology?
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Card read
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---------
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Addr 00 Command 43:
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Req:
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04 Payload length
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.. Mifare UID, four bytes.
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Resp:
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00 Status byte
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00 Payload length
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Description:
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Select MiFare by UID?
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Addr 00 Command 55:
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Req:
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05 Payload length
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.. Mifare UID, four bytes.
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03 ??
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Resp:
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00 Status byte
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00 Payload length
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Description:
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Unknown.
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Block 3 on a Mifare sector contains keys and an access control list.
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It is generally not accessed directly (unless being provisioned?)
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Addr 00 Command 52:
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Req:
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05 Payload length
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.. Mifare UID, four bytes.
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.. Block number, 1 or 2.
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Resp for Block 1:
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00 Status byte
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10 Payload length (1 block)
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.. "SBSD"
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00 00 00 00
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00 00 00 00
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00 4E C6 22
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Resp for Block 2:
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00 Status byte
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10 Payload length (1 block)
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.. 00 00 00 00 00 00 xx xx
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xx xx xx xx xx xx xx xx
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Description:
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Probably reads blocks 1 and 2 from Mifare sector 0.
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Block 0 contains the "vendor information" and UID.
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Block 1 contents are unknown, probably AiMe DB info.
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Block 2 last 10 bytes hex are printed on the card ("local unique id").
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(Block 3 contains encryption keys so is not allowed to be read)
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LED
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---
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Addr 08 Command 81:
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Req:
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03 Payload length
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ff Red intensity
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ff Green intensity
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ff Blue intensity
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Resp:
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None! Command is not acknowledged
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Description:
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Set LED color
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