Merge pull request #10689 from AGlass0fMilk/nrf52840-usbphy-implementation ...

nRF52840 USB Device Implementation

Removed mbed.h global include

Removed incorrect comment

Added spdx identifiers and fixed indentation in targets.json

Astyle fixed USBPhy_Nordic.cpp

Changed formatting, check if endpoint is stalled in unstall. Added errata header

Fixed failure on endpoint test data toggle reset (under Windows): "Data toggle not reset when calling ClearFeature(ENDPOINT_HALT) on an endpoint that has not been halted."

Added in code to fix deepsleep underflow. Nullify event handler member variable.

Lock sleep when USB is initialized ...

Added logic to lock deep sleep when USB is initialized to prevent malfunctioning. This is consistent with the other drivers. See PR ARMmbed/mbed-os#9879

Autoformatted with astyle

Fixed some comments

Fixed IRQ_ENABLE call to IRQ_DISABLE (oops).

Finished compatibility changes for nrfx renaming

Fixing compatibilities with new nrfx drivers

Removed redundant virtual status transfer notifications.

Added workaround for "unloading" IN endpoints after unstalling. Disable and then reenable when USBPhyHw::endpoint_unhalt() is called.

Removed unnecessary logic and changed round robin DMA scheduling

Added in flag for preventing double IRQ triggering and added asserts for Nordic driver calls

Ignore events that happen when an endpoint is stalled/halted

Added a return from the virtual status transfer software-triggered interrupt. Not entirely sure this is appropriate.

Added simulated status stage interrupt

Trying virtual status stage and generated interrupt

Added setup status enum and removed some old commented out code

Implemented USBPhyHw::unconfigure() as it was causing configuration changes to fail. Endpoints were not being removed properly in the Nordic driver

Added data toggle clearing to removing endpoints. Reworked aborting endpoints in nordic driver to prevent an ASSERT when it is called on ISO endpoints

Changed a little formatting

Added code to ignore ZLP packets on the ISOOUT endpoint... not fixing issue yet

Removed function call for SOF event -- frame counter is already included in data from usb event

Removed 0 max packet size assert for ISO endpoints. Ensured usbd_ep_abort would not be called on ISO endpoints (this currently causes an ASSERT in the Nordic driver

Fixed bug causing usb_control_stall_test to fail intermittently. Preparing the Nordic HW for the status stage of a control transfer would sometimes cause the HW to automatically ACK an "invalid" command during the control stall test. This would cause the test to fail (because an invalid request was not stalled).