Hello... my name is Carlos... I am Computer Science Engineer, with extensive experience in digital electronics (Micrhochip PICs, Arduino, Teensy, sensors, actuators, RC gear, etc.)... have worked many times with Teensy 3.1 and 3.2... Have experience programming in arduino environment and as an Computer Engineer I can write good pieces of code... If you are interested in writing a library I can help you... maybe looking why the one you found does not work... or writing a new one... Let me know.
Regards,
Carlos.