xxxajk/spi4teensy3 — pull request #3 by PaulStoffregen (2013-12-16 22:40:11+00:00)
Title: Keep unused native chip selects high (disabled)

This change prevents spi4teensy3 from interfering with other native SPI libraries using the native chip select signals.

Writing zeros to the SPI_MCR_PCSIS can cause other SPI devices to suddenly receive an active-low chip select. Those 5 bits should always be written as ones when not using this feature. (yes, the code in Teensyduino also do this... I'm updating it now)