Espressif ESP32-S2 Programming Manual page 876

Chapter 2. API Reference
}
}
void vAFunction( void )
{
// Create at least one task before starting the
xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
// Start the real time kernel
vTaskStartScheduler ();
// Will only get here when the vTaskCode () task has called
// vTaskEndScheduler
// execution.
}
void vTaskSuspendAll(void)
Suspends the scheduler without disabling interrupts. Context switches will not occur while the scheduler is
suspended.
After calling vTaskSuspendAll () the calling task will continue to execute without risk of being swapped out
until a call to xTaskResumeAll () has been made.
API functions that have the potential to cause a context switch (for example, vTaskDelayUntil(), xQueueSend(),
etc.) must not be called while the scheduler is suspended.
Example usage:
void vTask1( void
{
for( ;; )
{
// Task code goes
// ...
// At some point the task wants to perform a long operation during
// which it does
// taskENTER_CRITICAL ()/taskEXIT_CRITICAL ()
// operation may cause interrupts to be missed
// ticks.
// Prevent the real time kernel swapping out the
vTaskSuspendAll ();
// Perform the operation
// sections
// During this time interrupts will still operate
// tick count will be
// ...
// The operation
xTaskResumeAll ();
}
}
BaseType_t xTaskResumeAll(void)
Resumes scheduler activity after it was suspended by a call to vTaskSuspendAll().
xTaskResumeAll() only resumes the scheduler. It does not unsuspend tasks that were previously suspended by
a call to vTaskSuspend().
Espressif Systems
with preemption.
(). When we get here we are back to single task
* pvParameters )
here.
not want to get swapped
here.
as we have all the microcontroller processing
maintained.
is complete. Restart the
865
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kernel.
out. It cannot use
as the length of the
- including the
task.
There is no need to use critical
and
kernel.
(continued from previous page)
time.
the kernel
Release v4.4