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Add struct usblib_dev (and USBLIB, a pointer to the singleton) to
usb.h. USBLIB contains the global state which is used by
functionality imported from usb_lib/.
Consolidating global state into USBLIB will make it easier to remove
later.
Initial fields in struct usblib_dev are endpoint interrupt callbacks,
a mask for what to handle in the low-priority USB interrupt, and
device state. These replace pEpInt_IN, pEpInt_OUT; wInterrupt_Mask;
and bDeviceState, respectively from usb_lib/, so remove their
declarations from usb_lib_globals.h accordingly. Also remove unused
SaveState declaration from usblib_globals.h. Move bDeviceState into
'state' field in usblib_dev. Device state type changes from
DEVICE_STATE to usb_dev_state, volatile gets dropped, and enumerators
get a 'USB_' prefix, but it's otherwise the same.
usb_lib/ expects pInformation to point to Device_Info,
pUser_Standard_Requests -> User_Standard_Requests, and
pProperty -> Device_Property.
Alter usb_init_usblib() to reflect these assumptions. Reorganize
usb_lib_globals.h to make these assumptions more apparent to the
reader.
Modify usb_init_usblib() to take endpoint callbacks as arguments;
update its caller in usb_cdcacm.c.
usb_lib/ defines pInformation, pProperty, and pUser_Standard_Requests
itself (in usb_init.c), but we have our own definitions (in usb.c).
Remove the duplicates from usb.c. Also remove EPindex and Device_Info
definitions from usb.c. Unused, and anyways already defined in
usb_lib/usb_init.c.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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Add new usb_cdcacm.h, which provides the virtual serial port API.
This file (and new usb_cdcacm.c) consolidate the VCOM support, which
was previously distributed through descriptors.[hc], usb.[hc],
usb_callbacks.[hc], and usb_config.h.
Add usb_init_usblib() to usb.h, as a way of initializing the USB
peripheral in terms of the data structures required by usb_lib. This
is used by the new usb_cdcacm_enable().
Create new usb_lib_globals.h, with declarations for the usb_lib global
state which is most used throughout the rest of the libmaple USB stack.
Remove descriptors.c and usb_callbacks.[hc]; they are no longer
necessary.
Update the USB README accordingly.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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