7、任务通知
2022-11-30 18:18:05 2 举报AI智能生成
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作者其他创作
大纲/内容
通知状态和通知值
每个任务都有一个结构体：TCB (Task Control Block)
typedef struct tskTaskControlBlock
{
......
/* configTASK_NOTIFICATION_ARRAY_ENTRIES = 1 */
volatile uint32_t ulNotifiedValue[ configTASK_NOTIFICATION_ARRAY_ENTRIES ]; //通知值
volatile uint8_t ucNotifyState[ configTASK_NOTIFICATION_ARRAY_ENTRIES ]; //通知状态
......
} tskTCB
{
......
/* configTASK_NOTIFICATION_ARRAY_ENTRIES = 1 */
volatile uint32_t ulNotifiedValue[ configTASK_NOTIFICATION_ARRAY_ENTRIES ]; //通知值
volatile uint8_t ucNotifyState[ configTASK_NOTIFICATION_ARRAY_ENTRIES ]; //通知状态
......
} tskTCB
通知状态
taskNOT_WAITING_NOTIFICATION：任务没有在等待通知
taskWAITING_NOTIFICATION：任务在等待通知
taskNOTIFICATION_RECEIVED：任务接收到了通知，也被称为pending
通知值
计数值
位
任意数值
函数
xTaskNotifyGive/ulTaskNotifyTake
BaseType_t xTaskNotifyGive( TaskHandle_t xTaskToNotify );
void vTaskNotifyGiveFromISR( TaskHandle_t xTaskHandle, BaseType_t *pxHigherPriorityTaskWoken );
uint32_t ulTaskNotifyTake( BaseType_t xClearCountOnExit, TickType_t xTicksToWait)
xTaskNotify/xTaskNotifyWait
BaseType_t xTaskNotify( TaskHandle_t xTaskToNotify, uint32_t ulValue,
eNotifyAction eAction );
eNotifyAction eAction );
BaseType_t xTaskNotifyFromISR( TaskHandle_t xTaskToNotify,
uint32_t ulValue,
eNotifyAction eAction,
BaseType_t *pxHigherPriorityTaskWoken );
uint32_t ulValue,
eNotifyAction eAction,
BaseType_t *pxHigherPriorityTaskWoken );
BaseType_t xTaskNotifyWait( uint32_t ulBitsToClearOnEntry,
uint32_t ulBitsToClearOnExit,
uint32_t *pulNotificationValue,
TickType_t xTicksToWait )
uint32_t ulBitsToClearOnExit,
uint32_t *pulNotificationValue,
TickType_t xTicksToWait )
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