* Save 128 byte by moving variable to stack
* Make usb mass storage buffer smaller on F2 processors and put into reuseablebuffer
- Lower USB mass storage buffer to 512 bytes per default on F2
targets, makes usb speed slightly slower ~600 kB/s instead ~700 KB/s
in my tests, saving 3584 bytes
- Save another ~300 bytes by putting that buffer into reusableBuffer
* Don't put id into reusuableBuffer
All uses of id can be on the stack as well. Makes no difference for ram usage but makes it safer to reuse reusableBuffer
* Only link cdc serial when needed
We always linked usb cdc even in non debug builds. CDC uses about ~600 byte of RAM for its buffers and structures.
* USB fixes:
* USB initialized when USB cable is inserted and de-initialized when disconnected (this was the original way, which proved itself unreliable in the past. Now with the new USB library it appears to work without any problems. Used in this way result in safer operation - USB controller is disabled while unconnected)
Works without force device mod
* Serial: initialization of global variables
* Reduced RAM usage - data moved to FLASH
* Detailed USB interrupt counters (+ debug print fix)
* Serial2 changes:
* stm32 driver moved to common dir.
* earlier start of driver (Taranis)
* wait for free buffer time limited
USB changes:
* Upgrade to ST USB-Host-Device_Lib_V2.2.0 (from V2.1.0) - this fixed a problem with USB serial #4086)
* other fixes for #4086
* USB-Host-Device_Lib: renamed directory to V2.2.0 (from V2.1.0)
