RTOS

A custom RTOS framework for the TM4C MCU which includes custom implementation of malloc and free, priority-based scheduling, mutexes and semaphores and thread management.

Each LEDs represents the running threads and each buttons executes a task.

Features

• Priority-Based Scheduling: Lets user toggle priority scheduling for the threads, where level 0 is the highest priority and level 15 is the lowest. By default, there are 10 threads running with Idle being the lowest priority.
• Custom Memory Management: Custom implementation of malloc and free to prevent non-deterministic behaviors.
• Mutex and Semaphores: Resource management for threads avoid deadlocks and control access to shared resources.
• Shell Interface: Gives user access to manage threads - kill, restart, check pid or view memory and CPU usage.

Shell Interface

• reboot: Reboots the TM4C MCU.
• kill pid: Kill a thread using its PID.
• pkill threadname: Kill a thread using its thread name.
• preempt on|off: Toggle preemption using ON or OFF
• sched rr|prio: Toggle between Round-robin scheduling (sched rr) or priority scheduling (sched prio).
• pidof x: Gets the pid of a thread by typing the thread name.
• threadname: Restarts the thread if it is stopped.
• meminfo: Displays thread priority, name, memory address and memory size.

  

• ipcs: Displays the status of the mutexes and semaphores.

  

• ps: Displays the thread PID, CPU usage and its state.