+ QueueHandle_t xQueueCreateStatic(\r
+ UBaseType_t uxQueueLength,\r
+ UBaseType_t uxItemSize,\r
+ uint8_t *pucQueueStorageBuffer,\r
+ StaticQueue_t *pxQueueBuffer\r
+ );\r
+ * </pre>\r
+ *\r
+ * Creates a new queue instance, and returns a handle by which the new queue\r
+ * can be referenced.\r
+ *\r
+ * Internally, within the FreeRTOS implementation, queue's use two blocks of\r
+ * memory. The first block is used to hold the queue's data structures. The\r
+ * second block is used to hold items placed into the queue. If a queue is\r
+ * created using xQueueCreate() then both blocks of memory are automatically\r
+ * dynamically allocated inside the xQueueCreate() function. (see\r
+ * http://www.freertos.org/a00111.html). If a queue is created using\r
+ * xQueueCreateStatic() then the application writer can instead optionally\r
+ * provide the memory that will get used by the queue. xQueueCreateStatic()\r
+ * therefore allows a queue to be created without using any dynamic memory\r
+ * allocation.\r
+ *\r
+ * @param uxQueueLength The maximum number of items that the queue can contain.\r
+ *\r
+ * @param uxItemSize The number of bytes each item in the queue will require.\r
+ * Items are queued by copy, not by reference, so this is the number of bytes\r
+ * that will be copied for each posted item. Each item on the queue must be\r
+ * the same size.\r
+ *\r
+ * @param pucQueueStorageBuffer If pucQueueStorageBuffer is NULL then the memory\r
+ * used to hold items stored in the queue will be allocated dynamically, just as\r
+ * when a queue is created using xQueueCreate(). If pxQueueStorageBuffer is not\r
+ * NULL then it must point to a uint8_t array that is at least large enough to\r
+ * hold the maximum number of items that can be in the queue at any one time -\r
+ * which is ( uxQueueLength * uxItemsSize ) bytes.\r
+ *\r
+ * @param pxQueueBuffer If pxQueueBuffer is NULL then the memory required to\r
+ * hold the queue's data structures will be allocated dynamically, just as when\r
+ * a queue is created using xQueueCreate(). If pxQueueBuffer is not NULL then\r
+ * it must point to a variable of type StaticQueue_t, which will then be used to\r
+ * hold the queue's data structure, removing the need for the memory to be\r
+ * allocated dynamically.\r
+ *\r
+ * @return If the queue is successfully create then a handle to the newly\r
+ * created queue is returned. If the queue cannot be created then 0 is\r
+ * returned.\r
+ *\r
+ * Example usage:\r
+ <pre>\r
+ struct AMessage\r
+ {\r
+ char ucMessageID;\r
+ char ucData[ 20 ];\r
+ };\r
+\r
+ #define QUEUE_LENGTH 10\r
+ #define ITEM_SIZE sizeof( uint32_t )\r
+\r
+ // xQueueBuffer will hold the queue structure.\r
+ StaticQueue_t xQueueBuffer; \r
+\r
+ // ucQueueStorage will hold the items posted to the queue. Must be at least\r
+ // [(queue length) * ( queue item size)] bytes long.\r
+ uint8_t ucQueueStorage[ QUEUE_LENGTH * ITEM_SIZE ];\r
+\r
+ void vATask( void *pvParameters )\r
+ {\r
+ QueueHandle_t xQueue1;\r
+\r
+ // Create a queue capable of containing 10 uint32_t values.\r
+ xQueue1 = xQueueCreate( QUEUE_LENGTH, // The number of items the queue can hold.\r
+ ITEM_SIZE // The size of each item in the queue\r
+ &( ucQueueStorage[ 0 ] ), // The buffer that will hold the items in the queue.\r
+ &xQueueBuffer ); // The buffer that will hold the queue structure.\r
+\r
+ // The queue is guaranteed to be created successfully as no dynamic memory\r
+ // allocation was used. Therefore xQueue1 is now a handle to a valid queue.\r
+\r
+ // ... Rest of task code.\r
+ }\r
+ </pre>\r
+ * \defgroup xQueueCreate xQueueCreate\r
+ * \ingroup QueueManagement\r
+ */\r
+#if( configSUPPORT_STATIC_ALLOCATION == 1 )\r
+ #define xQueueCreateStatic( uxQueueLength, uxItemSize, pucQueueStorage, pxQueueBuffer ) xQueueGenericCreate( ( uxQueueLength ), ( uxItemSize ), ( pucQueueStorage ), ( pxQueueBuffer ), ( queueQUEUE_TYPE_BASE ) )\r
+#endif /* configSUPPORT_STATIC_ALLOCATION */\r
+\r
+/**\r
+ * queue. h\r
+ * <pre>\r
+ BaseType_t xQueueSendToToFront(\r
+ QueueHandle_t xQueue,\r
+ const void *pvItemToQueue,\r
+ TickType_t xTicksToWait\r
projects / freertos / blobdiff