cbaos

Simple microcontroller OS, with priority-based preemptive scheduling. Currently ported to a few ARM Cortex-Mx chips.

This is not a serious project, so if you use it be prepared to fix whatever is broken. It is "from scratch", its own CRT, linker scripts, libc - code has no external dependencies. Might be useful for learning about microcontroller bring-up.

Requirements

You'll need:

• scons
• arm-none-eabi- toolchain

Usage

./scripts/use_config.py configs/config_qemu_netduino2.py 
scons
./scripts/qemu_netduino2.sh

Or use a real target and flash cbaos.{elf,hex,bin} to your microcontroller.

Design

Some ideas stolen from Linux kernel:

• Tickless scheduler
• Coding style
• Device driver model

What works

• Last used target architecture should work
• QEMU for netduino2 target

TODO

• Automated testing for all targets (at least compile)
• Add support for newlib
• 64-bit systick (no wraparound worries)
• Timer support

Contributing

Pull requests gladly accepted, although there might be some delay.

Do note the project is licensed WTFPL (public domain equivalent).