Add instructions to use BOSSA to load nuttx into Due
Arduino Due: Fixes to FLASH address, flash wait states, updated Comments.  Now boots and runs a bit before crashing
Add an NSH configuration for the Arduino Due; Pluse several fixes related to the Due and to the SAM3X in general
SAM33/4: Need to disable write protection before modify PIO pin configuration
quick and not very accurate calibration of arduino due timing loops
SAM3U-EK touchscreen is now functional; created an NxWM configuration to test it further
Update LM FLASH definitions for LM4F120.  From Vinti
Changes to get a clean compile of configs/sam3u-ek/nxwm
Minor SAM3U-EK NxWM build updates, documentation, configurations
Update SAM3u-EK touchscreen status
Created new directories to hold SPI-related files
Add a general bit-bang SPI upper-half driver
Add a general bit-bang SPI lower-half driver and implement the bit-bang driver for the Arduino ITEAD TFT shield
clean up of SPI bit bang logic
Revise how delays are calculated in SPI bit bang driver so that we may get a little better frequency resolution
Add support for touchscreen on ITEAD Arduino shield. Untested
Flesh out a few missing pieces for the Arduino ITEAD TFT shield
Correct port direction for Arduino MISO signal
Several fixes to get a clean compile of the Arduino touch screen
Fix SF bug #15:  Typo replace error with ERROR