Rework the terminal input selection into an explicit three-way Kconfig
choice so the format each keyboard delivers is picked up front:
- On-screen keyboard (touch) - default, unchanged behaviour.
- Matrix / upper-half keyboard - reads struct keyboard_event_s events
(for example the M5Stack Cardputer matrix on /dev/kbd0).
- USB HID keyboard - reads a byte stream (for example /dev/kbda with
CONFIG_USBHOST_HIDKBD).
The physical-keyboard variant now polls the device non-blocking from the
LVGL thread (no dedicated task), mirroring the touch variant. The USB
path decodes the stream with the keyboard codec, so with a driver built
for CONFIG_HIDKBD_ENCODED the Up/Down cursor keys scroll the terminal;
a plain-ASCII stream still works as ordinary key presses.
Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>
Refactor the LVGL terminal into a shared core (lvglterm.c) plus two
selectable input variants: the existing on-screen touch keyboard
(lvglterm_touch.c) and a new physical keyboard variant (lvglterm_kbd.c) that
reads key events from a /dev/kbdN device and streams them to the shell.
The input source is chosen with a Kconfig choice (touch by default, keeping
the previous behaviour). The keyboard variant reads its device from
CONFIG_EXAMPLES_LVGLTERM_KBD_DEV (default /dev/kbd0), overridable by the first
command-line argument, and scrolls the output with the Fn cursor keys. A font
choice (UNSCII 8 or 16) is added for low-resolution displays.
Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>
This PR adds an LVGL App that executes NSH Commands (entered with a Touchscreen Keyboard) and renders the NSH Output. The app follows the same design as the `lvgldemo` app and is explained here: ["NuttX RTOS for PinePhone: LVGL Terminal for NSH Shell"](https://lupyuen.github.io/articles/terminal)
`examples/README.md`: Added doc for `lvglterm` app
`examples/lvglterm/lvglterm.c`: LVGL Terminal App
`examples/lvglterm/Makefile`, `Make.defs`: Makefile for LVGL Terminal
`examples/lvglterm/Kconfig`: Added menuconfig option for "Application Configuration > Examples > LVGL Terminal"
