graphics/microwindows: add Nano-X client/server support and examples for NuttX

[Acfboy]

Summary

This PR ports the Nano-X windowing system from Microwindows to NuttX so that X11-style client/server applications can run in a flat build. It contains three logical parts:

• graphics/microwindows: Build the Nano-X client library and server from the bundled Microwindows tree. Add:
  • MICROWINDOWS_NANOX to enable Nano-X client/server support.
  • MICROWINDOWS_NANOX_NANOWM to optionally link the Microwindows window manager into the server.
  • MICROWINDOWS_NANOX_NONETWORK to link clients directly with the server without sockets or the network stack.
  • Export Microwindows public headers through EXPORTED_INCLUDES.
• examples/nanoxcalc: Port the nxcalc demo. It connects to the running Nano-X server and displays a calculator keypad.
• examples/nanoxterm: Port the nxterm demo. It creates a pseudo-terminal and starts the configured NSH program in the child with posix_spawn() instead of relying on /bin/sh, since flat builds have no filesystem binaries. In network mode, it starts the Nano-X server as a separate task before connecting. It can therefore be used as the init entry point: booting sim:nanox opens the nxterm window directly, and typing nanoxcalc in it opens the calculator.

Impact

• Adds optional Nano-X client/server support and two Nano-X example applications.
• The corresponding Nano-X configuration and usage documentation is provided in the nuttx repository. boards: Add Nano-X Default Configs and Documents for Nuttx nuttx#19912

Testing

• Build host: Linux x86_64 with the GNU toolchain.
• Target: qemu-intel64:nanox, flat build.
• Run the following commands from the directory containing the nuttx repository:

cd nuttx
make distclean
./tools/configure.sh qemu-intel64:nanox
make -j$(nproc)

• Follow the document to make the iso and then run it in qemu:

cp nuttx iso/boot/nuttx.elf
grub-mkrescue -o boot_nanox.iso iso
qemu-system-x86_64 -cpu host -enable-kvm -m 2G -cdrom boot_nanox.iso -serial stdio -monitor none -no-reboot -device qemu-xhci -device usb-kbd -device usb-mouse

• The build completed successfully.
• QEMU booted directly into nanoxterm.
• The NSH terminal was usable, and running nanoxcalc opened the calculator window.

[cederom]

Thank you @Acfboy :-)

For sure we need a documentation for that part :-) I just did a rewrite of components / graphics / nx, so other gfx components are in one place, like framebuffer, and maybe nano-x, will push in a free moment this week :-)

[ppisa]

Great, I will look into patches soon. Do not forget to update Microwidows HASH in the graphics/microwindows/Makefile. The current master one could be

MICROWINDOWS_COMMIT_HASH := 2108675308cf69a5c1c54b483e29e3c039f319be

but you have pending changes so it would be ideal to change nuttx-apps one when mainline is updated.

PS: I will not be available next week/till August 23 night. I leave on this Friday or Saturday evening.

[ppisa]

Generally looks OK for me, question is if we need to export

CFLAGS += -DNUTTX=1

from graphics/microwindows/Makefile to control microwindows/microwindows/src/mwin/winmain.c not use dragwp in

int poll = (!canBlock || dragwp); 

for NuttX.

[acassis]

Hi @Acfboy do you have some new? The final evaluation will start in a few days. I think this is the only project that didn't integrate anything into NuttX mainline yet. @ppisa please help us.

[Acfboy]

@acassis Sorry for my slow progress. It's now ready for review.

[acassis]

@acassis Sorry for my slow progress. It's now ready for review.

@Acfboy no problem! Sorry for pushing, but I was really worried because we need it finished for your final evaluation.