feat(split): Runtime selection of split transport
Allow building multiple split transports, and select an active
one based on the transport availability. Wired split availability
depends on additional `detect-gpios` which must be a GPIO pin
that goes active when a wired connection is present.
feat(split): Suspend/resume wired UART devices.
To better support runtime split support, suspend/resume the UART
as necessary to save power when not using the UART.
docs(split): Document adjusting nRF52 UART interrupt priorities
For wired split on nRF52, you may need to adjust the priority for UART
interrupts lower, to ensure the interrupts used for timing sensitive
BT operations can run when needed, so document this in our pinctrl docs.
refactor(split): Restore use of aync UART on nRF52.
With fixes for Zephyr UART driver, re-enable using async API on nRF52.
fix(split): Minor wired split fixes.
Various minor fixes for wired split to avoid spurious TX in half duplex,
etc.
fix: Unconditionally define HID payloads to avoid error.
Don't conditionally define HID indicator payload, to avoid compilation
errors.
docs(split): Expand on details of split transports.
Expand the split keyboard documentation with a more fleshed out section
on the available split trasnports, and what is and isn't supported by
each, including the runtime selection functionality.
---------
Co-authored-by: Nicolas Munnich <98408764+nmunnich@users.noreply.github.com>
* Avoid doing duplicate calls to setings_load_subtree, which iterates
NVS fully each time under the hood, and instead use on settings_load
later in the lifecycle.
* Move to local/stack allocated event API that doesn't require
dynamic allocation/freeing.
* Disable heap, we no longer use alloc/free unless using LVGL.
* Tons of refactors all over to account for the new event approach.
Note there was one place where a non-strict prototype was actually being used
with an argument, in `zmk_hog_init`. In this case, the actual argument type was
added instead.
There is already a function to see if the peripheral is connected, a matching one for if it's bonded is a useful addition for displays/indicators. `is_bonded` gets reset to false in the advertising function in preparation for runtime peripheral bond clearing
* Split centrals to scan with their identity so they receive direct
advertising packets.
* Split peripherals to use direct advertising if they have an existing
bond to a split central.
* Proper usage of bt_uuid_cmp.
* Central's don't start scanning for peripherals if
`ZMK_BLE_CLEAR_BONDS_ON_START` is enabled.
* Split peripherals don't advertize if
`ZMK_BLE_CLEAR_BONDS_ON_START` is enabled.
* Add new API/status to track state of the
peripheral connection to the central.
* Add new peripheral status widget for displaying
the current status of the connection to
the central.
