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.