ADB Protocol Analyzer

A protocol analyzer for the Apple Desktop Bus (ADB).

HOWTO

Requirements

• PIC
  • Microchip MPASM (bundled with MPLAB)
    • Note that you must use MPLAB X version 5.35 or earlier or MPLAB 8 as later versions of MPLAB X have removed MPASM
  • A PIC12F1840 microcontroller
  • A device to program the PIC with
• Python
  • Python 3.x
  • PySerial

Steps

• Build the code using Microchip MPASM and download the result into a PIC12F1840.
• Connect the Tx line to a UART on a PC.
• Run the Python code.

Example

$ python3 -i analyzer.py
>>> import serial
>>> AdbAnalyzer(serial.Serial(port='/dev/ttyS0', baudrate=115200, timeout=1)).run()

Serial Protocol

• Uses 8-N-1 at 115200 baud.
• Host sends the ADB command bytes as received.
  • For a Talk (0bXXXX11XX) or Listen (0bXXXX10XX) command, this is followed with:
    • Payload length (1 byte, should be 2-8 but this is not enforced)
    • Payload
• Reset conditions are treated the same as SendReset commands.