Introduction

mdepx (also known as MDX or Machdep X) is an operating system for embedded applications.

Key features

• Real-time
• Priority-based time-sliced round-robin scheduling
• Fully preemptible, cooperative scheduling optional
• Tickless operation
• Static/Dynamic memory allocation
• Timed Mutexes, Semaphores
• Symmetric Multiprocessing (SMP)
• BSD libc
• BSD math library (msun)
• Flat address space

ISA supported

• ARM Cortex-M family (ARMv7-M, ARMv8-M)
• CHERI128 Hybrid and Pure ABI capability system models
• MIPS32, MIPS64
• RISC-V machine or supervisor modes, rv32, rv64, SMP

Platforms supported

• STMicroelectronics STM32
• Nordic Semiconductor nRF5, nRF9
• Raspberry Pi Pico
• Microchip PIC32
• SiFive
• Many others...

Emulators support (see emul/)

• qemu/riscv64c128 CHERI Pure Capability Mode
• qemu/riscv64 SMP
• qemu/riscv32 SMP
• qemu/mips64c128 CHERI Hybrid and Pure Capability Modes
• qemu/mips64

Featured applications (external)

• LTE 4G Link with nRF9160
• AI inference with stm32n6
• Neoden YY1 pick and place firmware
• CTSRD-CHERI device-model and device-model-riscv
• Other example apps

Getting started

See documentation.

Contributing

Please submit pull requests on github or send patches to [email protected].

Note that mdepx uses FreeBSD style(9) guide.

License

This project is licensed under two-clause BSD license.