The ST USB code will automatically receive on any
endpoint that is opened but not in the NAK state.
Make sure we set OUT endpoints to NAK initially.
It also happily writes via a NULL pointer in ep->xfer_buff
which writes to address 0x0000_0000. Since address
0x0 is aliased onto the internal flash by the BOOT0/1 pins
and the internal flash is (normally) in the LOCKED state,
this write puts the internal flash into an errored state.
This errored state means that writes to internal flash
are no longer allowed and all further writes fail.
***** PLEASE NOTE ***** From this revision all F4 based boards (Revolution/OSD) needs bootloader version 5 to boot properly
Conflicts:
flight/pios/stm32f4xx/libraries/CMSIS2/Device/ST/STM32F4xx/Source/osd/system_stm32f4xx.c
flight/targets/boards/osd/board-info.mk
make/boot-defs.mk
make/common-defs.mk
Also fixes warnings (and bugs) in F4 STM32_USB_OTG_Driver code, allowing -Werror to be enabled for all flight code.
Fixes all other compiler warnings that would otherwise cause the flight code to not compile with -Werror enabled.
Along the way, this also adds some uses of isnan() to various places rather than questionable tests for x != x and
x == x to check for NaNs.
+review OPReview
-Fixed casing for PIOS_BL_HELPER_FLASH_ERASE_BOOTLOADER
-fixed wrong condition in f1 bl_helper
-other cosmetic changes and use of stdbool in f1 pios_bl_helper
-remove now unused macros
+review OPReview-456
