Update to use 32-bit microsecond values.
Remove PIOS_DELAY_DiffuS per consensus (caller can do it easily themselves).
Update the core delay logic per Stac's suggestion to a version that is
resistant to various overflows.
Added PIOS_USB.
Global improvements, see specific files for changes.
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@144 ebee16cc-31ac-478f-84a7-5cbb03baadba
SD Card fixed and working, tested with 2Gb and 8Gb (SDHC) cards.
Changed startup_stm32f10x_HD.S to work with SysTick_Handler, needs to be changed back for FreeRTOS to work.
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@132 ebee16cc-31ac-478f-84a7-5cbb03baadba