源代码分析uCH.doc

/* Scaled uCOS.H* The Real-Time Kernel* (c) Copyright 1992-1995, Jean J. Labrosse, Plantation, FL * All Rights Reserved* from: V1.08* File : Scl_UCOS.H* By : Jean J. Labrosse Scaled by Beibei Shao */* uC/OS CONFIGURATION*/#define OS_STK_TYPE UBYTE /* Data type used for stack */#define OS_MAX_TASKS 20 /* Maximum number of tasks in your application */#define OS_MAX_EVENTS 20 /* Max. Number of event control blocks in the application */#define OS_IDLE_TASK_STK_SIZE 80 /* Idle task stack size (BYTEs) */#define OS_SEM_EN 1 /* Include code for SEMAPHORES */#define OS_TASK_SUSPEND_EN 1 /* Include code for OSTaskSuspend() and OSTaskResume() */* MISCELLANEOUS*/#ifdef OS_GLOBALS#define OS_EXT#else#define OS_EXT extern#endif#define OS_PRIO_SELF 0xFF /* Indicate SELF priority */* uC/OS ERROR CODES*/#define OS_NO_ERR 0#define OS_TIMEOUT 10#define OS_TASK_NOT_EXIST 11#define OS_PRIO_EXIST 40#define OS_PRIO_ERR 41#define OS_PRIO_INVALID 42#define OS_SEM_ERR 50#define OS_SEM_OVF 51#define OS_SEM_NOT_AVAIL 52#define OS_NO_MORE_TCB 70#define OS_TIME_NOT_DLY 80#define OS_TASK_SUSPEND_PRIO 90#define OS_TASK_SUSPEND_IDLE 91#define OS_TASK_RESUME_PRIO 100#define OS_TASK_NOT_SUSPENDED 101/* EVENT CONTROL BLOCK*/typedef struct os_event UBYTE OSEventGrp; /* Group corresponding to tasks waiting for event to occur */ UBYTE OSEventTbl8; /* List of tasks waiting for event to occur */ UWORD OSEventCnt; /* Count of used when event is a semaphore */ void *OSEventPtr; /* Pointer to message or queue structure */ OS_EVENT;/* uC/OS TASK CONTROL BLOCK*/typedef struct os_tcb void *OSTCBStkPtr; /* Pointer to current top of stack */ UBYTE OSTCBStat; /* Task status */ UBYTE OSTCBPrio; /* Task priority (0 = highest, 63 = lowest) */ UWORD OSTCBDly; /* Nbr ticks to delay task or, timeout waiting for event */ UBYTE OSTCBX; /* Bit position in group corresponding to task priority (0.7) */ UBYTE OSTCBY; /* Index into ready table corresponding to task priority */ UBYTE OSTCBBitX; /* Bit mask to access bit position in ready table */ UBYTE OSTCBBitY; /* Bit mask to access bit position in ready group */ OS_EVENT *OSTCBEventPtr; /* Pointer to event control block */ struct os_tcb *OSTCBNext; /* Pointer to next TCB in the TCB list */ struct os_tcb *OSTCBPrev; /* Pointer to previous TCB in the TCB list */ OS_TCB;/* uC/OS GLOBAL VARIABLES*/ /* SYSTEM VARIABLES */OS_EXT UWORD OSCtxSwCtr; /* Counter of number of context switches */OS_EXT ULONG OSIdleCtr; /* Idle counter */OS_EXT UBYTE OSIntNesting; /* Interrupt nesting level */OS_EXT BOOLEAN OSRunning; /* Flag indicating that kernel is running */OS_EXT OS_TCB *OSTCBCur; /* Pointer to currently running TCB */OS_EXT OS_TCB *OSTCBHighRdy; /* Pointer to highest priority TCB ready to run */OS_EXT OS_TCB *OSTCBPrioTbl64; /* Table of pointers to all created TCBs */* uC/OS FUNCTION PROTOTYPES*/void OSInit(void);void OSStart(void);void OSStartHighRdy(void);void OSSched(void);void OSSchedLock(void);void OSSchedUnlock(void);UBYTE OSTaskCreate(void (*task)(void *pd), void *pdata, void *pstk, UBYTE prio);UBYTE OSTaskSuspend(UBYTE prio);UBYTE OSTaskResume(UBYTE prio);UBYTE OSTCBInit(UBYTE prio, void *stk);void OSIntEnter(void);void OSIntExit(void);void OSIntCtxSw(void);void OSCtxSw(void);void OSTickISR(void);void OSTimeDly(UWORD ticks);UBYTE OSTimeD