ACS ACR89U-A1 User Manual download pdf (Page 71)

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ACR89U-A1 Application Programming Interface

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6.4.5. xTaskResumeAll

This function resumes real time kernel activity following a call to vTaskSuspendAll ( ). After a call to

xTaskSuspendAll ( ) the kernel will take control of which task is executing at any time.

[task.h]

portBASE_TYPE xTaskResumeAll( void );

Returns:

portBASE_TYPE

If resuming the scheduler caused a context switch then pdTRUE is returned,

otherwise pdFALSE is returned.

Example usage:

void vTask1( void * pvParameters )

{

for( ;; )

{

// Task code goes here.

// ...

// At some point the task wants to perform a long operation during

// which it does not want to get swapped out. It cannot use

// taskENTER_CRITICAL ()/taskEXIT_CRITICAL () as the length of the

// operation may cause interrupts to be missed - including the

// ticks.

// Prevent the real time kernel swapping out the task.

xTaskSuspendAll ();

// Perform the operation here. There is no need to use critical

// sections as we have all the microcontroller processing time.

// During this time interrupts will still operate and the real

// time kernel tick count will be maintained.

// ...

// The operation is complete. Restart the kernel. We want to

force

// a context switch - but there is no point if resuming the

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ACS ACR89U-A1 User Manual Page 71