Simple Task Scheduler for Arm

A simple, non-preemptive, cooperative task scheduler.

Usage

• Place OS_TaskTimer() in SysTick_Handler of the ARM system or any other 1ms period timer interrupt, this is the heart beat of the scheduler.
• Call OS_TaskExecution() in main() within a while(true) loop after creation of necessary tasks. It executes tasks in list/queue in a sequential manner. Task executions times are continuously checked, as task execution time reaches to the global os time (see OS_GetOsTime()), it is executed.
• A task can be inserted to list/queue using OS_TaskCreate(...) function. A task can be scheduled to be executed for a later time by the defer_time parameter.
• When a task STOPPED, it is dropped from the list to save memory. If need to pause a task SUSPEND it, and change its state to BLOCKED to resume.
• A task function must return its period (uint32_t value) which is used to update task next execution time and period info. Hence a task can dynamically arrange period/next execution time of itself.
• A demo project can be found here.

References

Referenced from avr-simple-scheduler by ferenc-nemeth.
Origin repo at github.com/eardali.

License

Distributed under the terms of the MIT license.