1299_ Task status and switching test in FreeRTOS

All learning summary ： GitHub - GreyZhang/g_FreeRTOS: learning notes about FreeRTOS.

About the definition of task status , There is a detailed description in this link ：FreeRTOS task states and state transitions described

This is a state machine for state transition , You can see the conditions for switching between various states . It can be seen from the state machine , It is consistent with the information seen when the code analysis task was created , The default initial state of the task is ready The state of . Only ready The state of can be switched to running, Therefore, when scheduling implementation involves task activation, it is usually added to the ready task list .blocked The typical reason for the state is because OS Provided delay Interface , The processing of returning to the running state is still to enter ready state .

In order to test the execution of each state , I created 2 individual Task, One of the low priority ones is activated conditionally vTaskDelay Time delay 1000ms; A high priority delay at the end of each execution 500ms. At high priority task Constantly get the status of two tasks . Follow the previous introduction , It should be available until the high priority task is running , Low priority tasks can switch between different states .

The design code is as follows ：

The above is a high priority task code design .

The above is the code design of low priority tasks .

The running effect of program compilation and burning ：

It can be seen from the test results , This effect is consistent with the expectation .