Task Scheduler Demo for NUCLEO-L432KC

A simple demo project to show basic capabilities of the arm task scheduler.

Notes

• Project based on STM32 CUBE IDE and SDK, tested on NUCLEO-L432KC board.
• It demonstrates some basic features of task scheduler such as task creation, scheduling a task to start at defined time, updating task period by changing return value of the task itself, stopping a task by another task.

Demo Details

• Clone repository under ST SDK (/path/to/sdk/STM32Cube_FW_L4_V1.18.0/Projects/NUCLEO-L432KC/), this because given project template in SDK implies relative path for SDK source and headers.
• Also clone arm task scheduler submodule.
  git submodule update --init --recursive
• Within CUBE IDE File -> Open Projects from File System -> Import Source at ../task-scheduler-demo/STM32CubeIDE/.
• Main demonstration code under ../task-scheduler-demo/tasks folder.
• Basically, there are two tasks. One is the main led blink task (taskLed()) which also schedules another task to stop itself (taskLedStop()).
  • taskLed() starts after 5sec, and blinks led every 1sec period, after 10 blinks period changes 5sec.
  • taskLedStop() is scheduled to run at 55th sec (relative to taskLed() starting time), it runs once and stops led blinking task.
  • taskInfo() prints some basic information about OS state for demontration purpose.
• printf() output redirected to serial port, details can be found under ../task-scheduler-demo/Src/nucleo_l432_uart_debug.c.
• Example print out of demo code (taskInfo()) given below.

-----Starting OS Task Execution-----
OS time: 2000
Task state: 1
Task period: 1000 msec
Task Ptr: 0x8003f7d, next execution time: 5000 msec
Task Ptr: 0x8003f7d (which creates Task Ptr: 0x8003fd5) is not executed yet
Second call scheduled to check task status later
OS time: 8000
Task state: 2
Task period: 1000 msec
Task Ptr: 0x8003f7d, next execution time: 9000 msec
Task Ptr: 0x8003fd5, next execution time: 60000 msec
Remaning time for the task (0x8003fd5): 52000 msec

References

• STM32 Cube IDE V1.18.
• STM32L4 SDK V1.18.0.
• NUCLEO-L432KC development board which uses STM32L432KC MCU.
• Origin repo at github.com/eardali.

License

Distributed under the terms of the BSD 3-Clause license.