JTAG pinout detector

About

This code can be used in combination with an Arduino Mega in order to detect the JTAG pinout of your prefered electronic device.

Code

Code modified from EnumJTAG and Arduinull:

http://hackerspace.be/images/4/48/Serjtar_table.pde.txt

Arduino Mega at 3.3v

• Use the arduino mega pins 22-43
• jtag TAP reset before every try
• output in tab-separated table
• Your arduino mega should run at 3.3v, for example, by using a hacked USB cable, which forks the 5v power from the USB to inject it into the external power connector

Screenshot

Upload one here. Ptr?

List of devices tested

Work

• device 1
• device 2
• device 3

Does not work

• device 1
• device 2
• device 3

Links

• http://deadhacker.com/2010/02/03/jtag-enumeration/
• http://lekernel.net/blog/?p=319
• http://hsb.wikidot.com/arduino-jtag-finder-workshop

Todo

• Port the code to an Arduino Duemilanove (total of 16 digital IO pins available -- pins 2 till 19 (analog pins 0 to 4 are usable for gpio)
• Document the 3.3v hacked USB cable
• Better documentation on how to use the software
• How to upload the code with avrdude on the command line
• PDE to HEX file conversion

Done

• Ported to the Arduino Duemilanove (ATMega168) (with 11 digital IO pins available, remove the GND pins with a multimeter first)