The code for the Advanced Microcontroller Topics Workshop #3: Context Switching
This project contains the implementation of a simple preemptively-multi-threaded operating system. A simple kernel and threading model are implemented and documented in kernel.h, kernel.c, thread.h, and thread.c. The kernel entry and exit routines, as well as the system call stubs, are implemented in assembly in kernel_asm.S. The kernel entry and exit routines are not complete, and must be implemented by the participants. A complete, functional implementation can be found in kernel_asm.S.reference for reference. A simple 3-thread program is implemented in main.c which blinks the onboard R, G, and B leds at different rates.
The presentation slides that accompany this code can be viewed here.