When I use both frameworks RTOS and FILESYSTEM, FATFileSystem.h cannot be found when compiling USBMSDHost.h.
It is no problem however to find FATFileSystem.h from main.cpp, at least if I don’t include USBMSDHost.h.
This should be simple to reproduce. Just start with project example mbed-filesystem and include USBMSDHost.h.
Using VSCode. My setup:
platform = ststm32
framework = mbed
board = disco_f769ni
Have tried different ways to help finding the filesystem\fat folder, like lib_deps, build_flag -I without success…