two days ago, I ported the WacomRipOff project from STM32 to Teensyduino. And It works ! only change I've done is instead of using interrupt waiting to receive the data from w9013, polling is the way to go because the Interrupt on my teensy is buggy. Anyway here is the GitHub repo https://github.com/TiNredmc/WacomRipOff_Teensy