freeRTOS事件组学习

Example usage:
 /* Declare a variable to hold thecreated event group. */
    EventGroupHandle_t xCreatedEventGroup;
 /* Attempt to create the event group. */
    xCreatedEventGroup = xEventGroupCreate();
 /* Was the event group createdsuccessfully? */
    if( xCreatedEventGroup == NULL )
    {
 /* The event group was not createdbecause there was insufficient
        FreeRTOS heap available. */
    }
    else
    {
 /* The event group was created. */
    }
事件的删除使用void vEventGroupDelete( EventGroupHandle_t xEventGroup );API函数。
置事件位使用EventBits_t xEventGroupSetBits( EventGroupHandle_t xEventGroup,
                                 const EventBits_t uxBitsToSet );
和
BaseType_t xEventGroupSetBitsFromISR(
                          EventGroupHandle_t xEventGroup,
                          const EventBits_t uxBitsToSet,
                          BaseType_t *pxHigherPriorityTaskWoken );