The best way to get a feel of zephyr for the smartwatch, is to start building applications.
The watch framework is under /app.
The framework contains a clock, bluetooth, a procedure to upgrade over the air, cts …
To reduce the complexity, samples are provided. Each sample contains a single feature of the framework.
A button for the posix simulation watch, is a lvgl push button.
A button for the pinetime is a real button, which needs 2 (!) gpio ports
A button for the Desay D6 is a real button, which needs 1 gpio port.
To complicate matters, a button on the pinetime can be both an lvgl button and a real gpio-enabled button.
Using a framework, which would suit these watches, needs to distinguish between the boards (use a condition with parameter : CONFIG_BOARD)
The “native_posix_64” board is your own linux-box. This means that you can execute the code on your system. You do not need a smartwatch.
west build -p -b native_posix_64 samples/button/sdlbutton
running : ./build/zephyr/zephyr.exe
west build -p -b pinetime_devkit1 samples/button/pinebutton
running : west flash
The pinetime does have a button on the side.
The desay D6 has a touchbutton in front.
The virtual POSIX watch has a touchbutton
Note:: The pinetime watch has a button out port (15) and button in port (13). You have to set the out-port high. Took me a while to figure this out…