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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN1105 데이터시트(PDF) 42 Page - STMicroelectronics |
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AN1105 데이터시트(HTML) 42 Page - STMicroelectronics |
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42 / 100 page  42/100 ST7 pCAN PERIPHERAL DRIVER FIFO Management Structure In the main structure, we find: typedef struct { u8 fifo_size; FIFO_Object* first_object; FIFO_Object* last_object; CAN_Bool isinuse; } FIFO; The structures shown here look more like parts of a chained-list. Indeed, the data-type imple- mented is not pure FIFO, but simulates the behaviour of a real queue. Three FIFO_Objects are statically defined and linked together in a circular way (in the CAN_First_Init routine). One FIFO variable is also defined and initialized in the meantime (cf. in can.c): //Transmission queue static FIFO CAN_transmit_queue; static FIFO_Object CAN_queue_object_1; static FIFO_Object CAN_queue_object_2; static FIFO_Object CAN_queue_object_3; The maximum size of the queue is therefore 3. To simulate in-queuing/out-queuing, you only have to verify that the size limit will not be over- ridden, and update the fields in the FIFO structure. The “isinuse” Boolean is checked each time the variable is accessed to prevent read/write conflicts. |
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