Copyright (C) 2016 Phillip Pearson pp@myelin.co.nz
The teensy-openocd-remote-bitbang.ino sketch implements the OpenOCD JTAG remote_bitbang protocol using a USB serial port, so you can use a Teensy as a simple USB JTAG adapter with OpenOCD and socat.
Run it on a Teensy 3.1 or 3.2 from PJRC: https://www.pjrc.com/teensy/teensy31.html
python remote_bitbang_serial_debug.py -P 3335 /dev/tty.usbmodem*