USB reworked

[ghost]

USB configuration is more generic and free of the core.
It is easier to import new USB class from a library.

HIDComposite has been moved inside an independent library used by Keyboard and Mouse libraries.
USBSerial has been moved inside is own library too.

USBSerial must be tested with BluePill and Maple Mini boards.

"USB interface" menu is now only used to enable USB.

Suggestions are welcome.

[RickKimball]

Are you going to add NUCELO-F103RB, BluePill and MapleMini to this or do I have to manually merge those changes?

[fpistm]

@RickKimball goal is to have all merged. This PR is a first proposal version from Fabien to manage USB features:

• HID
• CDC
• USBMicrophone (which is ongoing and will be available here USBMicrophone

Still to include DFU.

I have to benchmark and review this PR to see if it could be applicable. Mainly around USB performance as in @rogerclarkmelbourne core several works have been done to enhance it.
FYI Fabien is out of office during 1 week so don't worry if he will not answer during this period.

[fpistm]

Please follow the Arduino library guideline: https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#source-code

Source code of a library should be in 'src/' directory

• USBHIDComposite
• USBSerial

[ghost]

Done! I added src directory in libraries.

[fpistm]

One blocking thing is about the need to #include <USBSerial.h> to have the SerialUSB.
This will break several sketch compatibility

[ghost]

We have the solution to propose this library by default (not an external library) and include USBSerial.h in the Arduino.h. And add the flag USBCON to avoid compilation when USB is not used. What do you think?

Approved by error. Still some review to perform

[chwon64]

I am using 2017.9.22 release. This version doesn't support USB for STML0 CPU.
Do you have plan when it will be supported?

[fpistm]

Hope soon, currently working on it as a background task.

[chwon64]

That's great. Thanks for quick response.

[hei5enbrg]

is usb-cdc working for stm32f411 in the current release?

[fpistm]

Currently not. It will be one of the next feature to add

[hei5enbrg]

OK. Even mbed lacks, last time I checked.
I'll have to use stmcube APIs then. Thanks

[fpistm]

In fact, it was functionnal, but required some clean. First will be to rebsse it properly

[fpistm]

I close this one to not pollute the list of PR and bring confusion.
Moreover this one is referenced by #388