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README.md
acc_id_sniff.c

README.md

This program can be used to sniff the bytes exchanged between an iDevice and a MFI accessory during the identification process on the ACC_ID pin.

This is intended to run on an Arduino but other AVR boards can be used.

The ACC_ID pin must be connected to the pin PD3 of the board (Digital pin 3 of the Arduino Uno, or digital pin 18 of the Arduino Mega). But any other digital pin could be used, you just have to modify the code for that.

The code is not written with the Arduino IDE. Here are instructions for compiling and uploading the code:

  • For Arduino Uno:
avr-gcc -DF_CPU=16000000UL -mmcu=atmega328p -Os -o acc_id_sniff.o acc_id_sniff.c
avr-objcopy -O ihex -R .eeprom acc_id_sniff.o acc_id_sniff.hex
avrdude -V -F -c arduino -p m328p -b 115200 -P /dev/ttyACM0 -U flash:w:acc_id_sniff.hex
  • For Arduino Mega:
avr-gcc -DF_CPU=16000000UL -mmcu=atmega2560 -Os -o acc_id_sniff.o acc_id_sniff.c
avr-objcopy -O ihex -R .eeprom acc_id_sniff.o acc_id_sniff.hex
avrdude -V -F -c stk500v2 -p m2560 -b 115200 -P /dev/ttyACM0 -U flash:w:acc_id_sniff.hex