https://forum.pjrc.com/threads/32834-SPI-disable-not-working-correctly-with-setMOSI-setMISO-setSCK

https://forum.pjrc.com/threads/33072-IntervalTimer-h-bug

Add MOUSE_BACK and MOUSE_FORWARD to usb_mouse

Add MOUSE_BACK, MOUSE_FORWARD

Add MOUSE_BACK, MOUSE_FORWARD

Add MOUSE_BACK, MOUSE_FORWARD

Add OUTPUT_OPENDRAIN, INPUT_PULLDOWN for pinMode()

CMP reg def

https://forum.pjrc.com/threads/32999-using-IntervalTimer-with-SPI-usingInterrupt%28%29

Add INPUT_PULLDOWN and OUTPUT_OPENDRAIN options for pinMode()

Get enabled NVIC ISR's

use float version of fcvt

fixes #109

Remove functions already defined in the standard library

Add SCB_SCR register definitions

Sometimes the PC or Mac drivers are not actually ready to begin receiving data immediately after they cause DTR or RTS to assert.  This delay allows the PC to become ready before we tell sketches the Serial device is true (ready).

Fix compile error with clang casting long* to int*

An attempt to make the teensy3/Makefile completely Arduino independent