uCOS-II源码及源码分析_2.52版本

/* ********************************************************************************************************* * uC/OS-II * The Real-Time Kernel * CORE FUNCTIONS * * (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL * All Rights Reserved * * File : OS_CORE.C * By : Jean J. Labrosse ********************************************************************************************************* */ #ifndef OS_MASTER_FILE #define OS_GLOBALS #include "includes.h" #endif /* ********************************************************************************************************* * MAPPING TABLE TO MAP BIT POSITION TO BIT MASK * * Note: Index into table is desired bit position, 0..7 * Indexed value corresponds to bit mask ********************************************************************************************************* */ INT8U const OSMapTbl[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80}; /* ********************************************************************************************************* * PRIORITY RESOLUTION TABLE * * Note: Index into table is bit pattern to resolve highest priority * Indexed value corresponds to highest priority bit position (i.e. 0..7) ********************************************************************************************************* */ INT8U const OSUnMapTbl[] = { 0, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x00 to 0x0F */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x10 to 0x1F */ 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x20 to 0x2F */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x30 to 0x3F */ 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x40 to 0x4F */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x50 to 0x5F */ 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x60 to 0x6F */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x70 to 0x7F */ 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x80 to 0x8F */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0x90 to 0x9F */ 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0xA0 to 0xAF */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0xB0 to 0xBF */ 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0xC0 to 0xCF */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0xD0 to 0xDF */ 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 0xE0 to 0xEF */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 /* 0xF0 to 0xFF */ }; /* ********************************************************************************************************* * FUNCTION PROTOTYPES ********************************************************************************************************* */ static void OS_InitEventList(void); static void OS_InitMisc(void); static void OS_InitRdyList(void); static void OS_InitTaskIdle(void); static void OS_InitTaskStat(void); static void OS_InitTCBList(void); /*$PAGE*/ /* ********************************************************************************************************* * INITIALIZATION * * Description: This function is used to initialize the internals of uC/OS-II and MUST be called prior to * creating any uC/OS-II object and, prior to calling OSStart(). * * Arguments : none * * Returns : none ********************************************************************************************************* */ void OSInit (void) { #if OS_VERSION >= 204 OSInitHookBegin(); /* Call port specific initialization code */ #endif OS_InitMisc(); /* Initialize miscellaneous variables */ OS_InitRdyList(); /* Initialize the Ready List */ OS_InitTCBList(); /* Initialize the free list of OS_TCBs */ OS_InitEventList(); /* Initialize the free list of OS_EVENTs */ #if (OS_VERSION >= 251) && (OS_FLAG_EN > 0) && (OS_MAX_FLAGS > 0) OS_FlagInit(); /* Initialize the event flag structures */ #endif #if (OS_MEM_EN > 0) && (OS_MAX_MEM_PART > 0) OS_MemInit(); /* Initialize the memory manager */ #endif #if (OS_Q_EN > 0) && (OS_MAX_QS > 0) OS_QInit(); /* Initialize the message queue structures */ #endif OS_InitTaskIdle(); /* Create the Idle Task */ #if OS_TASK_STAT_EN > 0 OS_InitTaskStat(); /* Create the Statistic Task */ #endif #if OS_VERSION >= 204 OSInitHookEnd(); /* Call port specific init. code */ #endif } /*$PAGE*/ /* ********************************************************************************************************* * ENTER ISR * * Description: This function is used to notify uC/OS-II that you are about to service an interrupt * service routine (ISR). This allows uC/OS-II to keep track of interrupt nesting and thus * only perform rescheduling at the last nested ISR. * * Arguments : none * * Returns : none * * Notes : 1) This function should be called ith interrupts already disabled * 2) Your ISR can directly increment OSIntNesting without calling this function because * OSIntNesting has been declared 'global'. * 3) You MUST still call OSIntExit() even though you increment OSIntNesting directly. * 4) You MUST invoke OSIntEnter() and OSIntExit() in pair. In other words, for every call * to OSIntEnter() at the beginning of the ISR you MUST have a call to OSIntExit() at the * end of the ISR. * 5) You are allowed to nest interrupts up to 255 levels deep. * 6) I removed the OS_ENTER_CRITICAL() and OS_EXIT_CRITICAL() around the increment because * OSIntEnter() is always called with interrupts disabled. ********************************************************************************************************* */ void OSIntEnter (void) { if (OSRunning == TRUE) { if (OSIntNesting < 255) { OSIntNesting++; /* Increment ISR nesting level */ } } } /*$PAGE*/ /* ********************************************************************************************************* * EXIT ISR * * Description: This function is used to notify uC/OS-II that you have completed serviving an ISR. When * the last nested ISR has completed, uC/OS-II will call the