OS_CORE.C
上传用户:ssllxx2007
上传日期:2022-06-12
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文件大小:49k
- /*
- *********************************************************************************************************
- * 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 "..APPincludes.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 */
- }
- }
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * EXIT ISR
- *
- * Description: This function is used to notify uC/OS-II that you have completed serviving an ISR. When
- * the last nested ISR has completed, uC/OS-II will call the scheduler to determine whether
- * a new, high-priority task, is ready to run.
- *
- * Arguments : none
- *
- * Returns : none
- *
- * Notes : 1) You MUST invoke OSIntEnter() and OSIntExit() in pair. In other words, for every call
- * to OSIntEnter() at the beginning of the ISR you MUST have a call to OSIntExit() at the
- * end of the ISR.
- * 2) Rescheduling is prevented when the scheduler is locked (see OS_SchedLock())
- *********************************************************************************************************
- */
- void OSIntExit (void)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
-
-
- if (OSRunning == TRUE) {
- OS_ENTER_CRITICAL();
- if (OSIntNesting > 0) { /* Prevent OSIntNesting from wrapping */
- OSIntNesting--;
- }
- if ((OSIntNesting == 0) && (OSLockNesting == 0)) { /* Reschedule only if all ISRs complete ... */
- OSIntExitY = OSUnMapTbl[OSRdyGrp]; /* ... and not locked. */
- OSPrioHighRdy = (INT8U)((OSIntExitY << 3) + OSUnMapTbl[OSRdyTbl[OSIntExitY]]);
- if (OSPrioHighRdy != OSPrioCur) { /* No Ctx Sw if current task is highest rdy */
- OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
- OSCtxSwCtr++; /* Keep track of the number of ctx switches */
- OSIntCtxSw(); /* Perform interrupt level ctx switch */
- }
- }
- OS_EXIT_CRITICAL();
- }
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * PREVENT SCHEDULING
- *
- * Description: This function is used to prevent rescheduling to take place. This allows your application
- * to prevent context switches until you are ready to permit context switching.
- *
- * Arguments : none
- *
- * Returns : none
- *
- * Notes : 1) You MUST invoke OSSchedLock() and OSSchedUnlock() in pair. In other words, for every
- * call to OSSchedLock() you MUST have a call to OSSchedUnlock().
- *********************************************************************************************************
- */
- #if OS_SCHED_LOCK_EN > 0
- void OSSchedLock (void)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
-
-
- if (OSRunning == TRUE) { /* Make sure multitasking is running */
- OS_ENTER_CRITICAL();
- if (OSLockNesting < 255) { /* Prevent OSLockNesting from wrapping back to 0 */
- OSLockNesting++; /* Increment lock nesting level */
- }
- OS_EXIT_CRITICAL();
- }
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * ENABLE SCHEDULING
- *
- * Description: This function is used to re-allow rescheduling.
- *
- * Arguments : none
- *
- * Returns : none
- *
- * Notes : 1) You MUST invoke OSSchedLock() and OSSchedUnlock() in pair. In other words, for every
- * call to OSSchedLock() you MUST have a call to OSSchedUnlock().
- *********************************************************************************************************
- */
- #if OS_SCHED_LOCK_EN > 0
- void OSSchedUnlock (void)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
-
-
- if (OSRunning == TRUE) { /* Make sure multitasking is running */
- OS_ENTER_CRITICAL();
- if (OSLockNesting > 0) { /* Do not decrement if already 0 */
- OSLockNesting--; /* Decrement lock nesting level */
- if ((OSLockNesting == 0) && (OSIntNesting == 0)) { /* See if sched. enabled and not an ISR */
- OS_EXIT_CRITICAL();
- OS_Sched(); /* See if a HPT is ready */
- } else {
- OS_EXIT_CRITICAL();
- }
- } else {
- OS_EXIT_CRITICAL();
- }
- }
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * START MULTITASKING
- *
- * Description: This function is used to start the multitasking process which lets uC/OS-II manages the
- * task that you have created. Before you can call OSStart(), you MUST have called OSInit()
- * and you MUST have created at least one task.
- *
- * Arguments : none
- *
- * Returns : none
- *
- * Note : OSStartHighRdy() MUST:
- * a) Call OSTaskSwHook() then,
- * b) Set OSRunning to TRUE.
- * c) Load the context of the task pointed to by OSTCBHighRdy.
- * d_ Execute the task.
- *********************************************************************************************************
- */
- void OSStart (void)
- {
- INT8U y;
- INT8U x;
- if (OSRunning == FALSE) {
- y = OSUnMapTbl[OSRdyGrp]; /* Find highest priority's task priority number */
- x = OSUnMapTbl[OSRdyTbl[y]];
- OSPrioHighRdy = (INT8U)((y << 3) + x);
- OSPrioCur = OSPrioHighRdy;
- OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy]; /* Point to highest priority task ready to run */
- OSTCBCur = OSTCBHighRdy;
- OSStartHighRdy(); /* Execute target specific code to start task */
- }
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * STATISTICS INITIALIZATION
- *
- * Description: This function is called by your application to establish CPU usage by first determining
- * how high a 32-bit counter would count to in 1 second if no other tasks were to execute
- * during that time. CPU usage is then determined by a low priority task which keeps track
- * of this 32-bit counter every second but this time, with other tasks running. CPU usage is
- * determined by:
- *
- * OSIdleCtr
- * CPU Usage (%) = 100 * (1 - ------------)
- * OSIdleCtrMax
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- #if OS_TASK_STAT_EN > 0
- void OSStatInit (void)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
-
-
- OSTimeDly(2); /* Synchronize with clock tick */
- OS_ENTER_CRITICAL();
- OSIdleCtr = 0L; /* Clear idle counter */
- OS_EXIT_CRITICAL();
- OSTimeDly(OS_TICKS_PER_SEC); /* Determine MAX. idle counter value for 1 second */
- OS_ENTER_CRITICAL();
- OSIdleCtrMax = OSIdleCtr; /* Store maximum idle counter count in 1 second */
- OSStatRdy = TRUE;
- OS_EXIT_CRITICAL();
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * PROCESS SYSTEM TICK
- *
- * Description: This function is used to signal to uC/OS-II the occurrence of a 'system tick' (also known
- * as a 'clock tick'). This function should be called by the ticker ISR but, can also be
- * called by a high priority task.
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- void OSTimeTick (void)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- OS_TCB *ptcb;
- OSTimeTickHook(); /* Call user definable hook */
- #if OS_TIME_GET_SET_EN > 0
- OS_ENTER_CRITICAL(); /* Update the 32-bit tick counter */
- OSTime++;
- OS_EXIT_CRITICAL();
- #endif
- if (OSRunning == TRUE) {
- ptcb = OSTCBList; /* Point at first TCB in TCB list */
- while (ptcb->OSTCBPrio != OS_IDLE_PRIO) { /* Go through all TCBs in TCB list */
- OS_ENTER_CRITICAL();
- if (ptcb->OSTCBDly != 0) { /* Delayed or waiting for event with TO */
- if (--ptcb->OSTCBDly == 0) { /* Decrement nbr of ticks to end of delay */
- if ((ptcb->OSTCBStat & OS_STAT_SUSPEND) == OS_STAT_RDY) { /* Is task suspended? */
- OSRdyGrp |= ptcb->OSTCBBitY; /* No, Make task R-to-R (timed out)*/
- OSRdyTbl[ptcb->OSTCBY] |= ptcb->OSTCBBitX;
- } else { /* Yes, Leave 1 tick to prevent ... */
- ptcb->OSTCBDly = 1; /* ... loosing the task when the ... */
- } /* ... suspension is removed. */
- }
- }
- ptcb = ptcb->OSTCBNext; /* Point at next TCB in TCB list */
- OS_EXIT_CRITICAL();
- }
- }
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * GET VERSION
- *
- * Description: This function is used to return the version number of uC/OS-II. The returned value
- * corresponds to uC/OS-II's version number multiplied by 100. In other words, version 2.00
- * would be returned as 200.
- *
- * Arguments : none
- *
- * Returns : the version number of uC/OS-II multiplied by 100.
- *********************************************************************************************************
- */
- INT16U OSVersion (void)
- {
- return (OS_VERSION);
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * DUMMY FUNCTION
- *
- * Description: This function doesn't do anything. It is called by OSTaskDel().
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- #if OS_TASK_DEL_EN > 0
- void OS_Dummy (void)
- {
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * MAKE TASK READY TO RUN BASED ON EVENT OCCURING
- *
- * Description: This function is called by other uC/OS-II services and is used to ready a task that was
- * waiting for an event to occur.
- *
- * Arguments : pevent is a pointer to the event control block corresponding to the event.
- *
- * msg is a pointer to a message. This pointer is used by message oriented services
- * such as MAILBOXEs and QUEUEs. The pointer is not used when called by other
- * service functions.
- *
- * msk is a mask that is used to clear the status byte of the TCB. For example,
- * OSSemPost() will pass OS_STAT_SEM, OSMboxPost() will pass OS_STAT_MBOX etc.
- *
- * Returns : none
- *
- * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
- *********************************************************************************************************
- */
- #if OS_EVENT_EN > 0
- INT8U OS_EventTaskRdy (OS_EVENT *pevent, void *msg, INT8U msk)
- {
- OS_TCB *ptcb;
- INT8U x;
- INT8U y;
- INT8U bitx;
- INT8U bity;
- INT8U prio;
- y = OSUnMapTbl[pevent->OSEventGrp]; /* Find highest prio. task waiting for message */
- bity = OSMapTbl[y];
- x = OSUnMapTbl[pevent->OSEventTbl[y]];
- bitx = OSMapTbl[x];
- prio = (INT8U)((y << 3) + x); /* Find priority of task getting the msg */
- if ((pevent->OSEventTbl[y] &= ~bitx) == 0x00) { /* Remove this task from the waiting list */
- pevent->OSEventGrp &= ~bity; /* Clr group bit if this was only task pending */
- }
- ptcb = OSTCBPrioTbl[prio]; /* Point to this task's OS_TCB */
- ptcb->OSTCBDly = 0; /* Prevent OSTimeTick() from readying task */
- ptcb->OSTCBEventPtr = (OS_EVENT *)0; /* Unlink ECB from this task */
- #if ((OS_Q_EN > 0) && (OS_MAX_QS > 0)) || (OS_MBOX_EN > 0)
- ptcb->OSTCBMsg = msg; /* Send message directly to waiting task */
- #else
- msg = msg; /* Prevent compiler warning if not used */
- #endif
- ptcb->OSTCBStat &= ~msk; /* Clear bit associated with event type */
- if (ptcb->OSTCBStat == OS_STAT_RDY) { /* See if task is ready (could be susp'd) */
- OSRdyGrp |= bity; /* Put task in the ready to run list */
- OSRdyTbl[y] |= bitx;
- }
- return (prio);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * MAKE TASK WAIT FOR EVENT TO OCCUR
- *
- * Description: This function is called by other uC/OS-II services to suspend a task because an event has
- * not occurred.
- *
- * Arguments : pevent is a pointer to the event control block for which the task will be waiting for.
- *
- * Returns : none
- *
- * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
- *********************************************************************************************************
- */
- #if OS_EVENT_EN > 0
- void OS_EventTaskWait (OS_EVENT *pevent)
- {
- OSTCBCur->OSTCBEventPtr = pevent; /* Store pointer to event control block in TCB */
- if ((OSRdyTbl[OSTCBCur->OSTCBY] &= ~OSTCBCur->OSTCBBitX) == 0x00) { /* Task no longer ready */
- OSRdyGrp &= ~OSTCBCur->OSTCBBitY; /* Clear event grp bit if this was only task pending */
- }
- pevent->OSEventTbl[OSTCBCur->OSTCBY] |= OSTCBCur->OSTCBBitX; /* Put task in waiting list */
- pevent->OSEventGrp |= OSTCBCur->OSTCBBitY;
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * MAKE TASK READY TO RUN BASED ON EVENT TIMEOUT
- *
- * Description: This function is called by other uC/OS-II services to make a task ready to run because a
- * timeout occurred.
- *
- * Arguments : pevent is a pointer to the event control block which is readying a task.
- *
- * Returns : none
- *
- * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
- *********************************************************************************************************
- */
- #if OS_EVENT_EN > 0
- void OS_EventTO (OS_EVENT *pevent)
- {
- if ((pevent->OSEventTbl[OSTCBCur->OSTCBY] &= ~OSTCBCur->OSTCBBitX) == 0x00) {
- pevent->OSEventGrp &= ~OSTCBCur->OSTCBBitY;
- }
- OSTCBCur->OSTCBStat = OS_STAT_RDY; /* Set status to ready */
- OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0; /* No longer waiting for event */
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * INITIALIZE EVENT CONTROL BLOCK'S WAIT LIST
- *
- * Description: This function is called by other uC/OS-II services to initialize the event wait list.
- *
- * Arguments : pevent is a pointer to the event control block allocated to the event.
- *
- * Returns : none
- *
- * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
- *********************************************************************************************************
- */
- #if ((OS_Q_EN > 0) && (OS_MAX_QS > 0)) || (OS_MBOX_EN > 0) || (OS_SEM_EN > 0) || (OS_MUTEX_EN > 0)
- void OS_EventWaitListInit (OS_EVENT *pevent)
- {
- INT8U *ptbl;
- pevent->OSEventGrp = 0x00; /* No task waiting on event */
- ptbl = &pevent->OSEventTbl[0];
- #if OS_EVENT_TBL_SIZE > 0
- *ptbl++ = 0x00;
- #endif
- #if OS_EVENT_TBL_SIZE > 1
- *ptbl++ = 0x00;
- #endif
- #if OS_EVENT_TBL_SIZE > 2
- *ptbl++ = 0x00;
- #endif
- #if OS_EVENT_TBL_SIZE > 3
- *ptbl++ = 0x00;
- #endif
- #if OS_EVENT_TBL_SIZE > 4
- *ptbl++ = 0x00;
- #endif
- #if OS_EVENT_TBL_SIZE > 5
- *ptbl++ = 0x00;
- #endif
- #if OS_EVENT_TBL_SIZE > 6
- *ptbl++ = 0x00;
- #endif
- #if OS_EVENT_TBL_SIZE > 7
- *ptbl = 0x00;
- #endif
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * INITIALIZATION
- * INITIALIZE THE FREE LIST OF EVENT CONTROL BLOCKS
- *
- * Description: This function is called by OSInit() to initialize the free list of event control blocks.
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- static void OS_InitEventList (void)
- {
- #if (OS_EVENT_EN > 0) && (OS_MAX_EVENTS > 0)
- #if (OS_MAX_EVENTS > 1)
- INT16U i;
- OS_EVENT *pevent1;
- OS_EVENT *pevent2;
- pevent1 = &OSEventTbl[0];
- pevent2 = &OSEventTbl[1];
- for (i = 0; i < (OS_MAX_EVENTS - 1); i++) { /* Init. list of free EVENT control blocks */
- pevent1->OSEventType = OS_EVENT_TYPE_UNUSED;
- pevent1->OSEventPtr = pevent2;
- pevent1++;
- pevent2++;
- }
- pevent1->OSEventType = OS_EVENT_TYPE_UNUSED;
- pevent1->OSEventPtr = (OS_EVENT *)0;
- OSEventFreeList = &OSEventTbl[0];
- #else
- OSEventFreeList = &OSEventTbl[0]; /* Only have ONE event control block */
- OSEventFreeList->OSEventType = OS_EVENT_TYPE_UNUSED;
- OSEventFreeList->OSEventPtr = (OS_EVENT *)0;
- #endif
- #endif
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * INITIALIZATION
- * INITIALIZE MISCELLANEOUS VARIABLES
- *
- * Description: This function is called by OSInit() to initialize miscellaneous variables.
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- static void OS_InitMisc (void)
- {
- #if OS_TIME_GET_SET_EN > 0
- OSTime = 0L; /* Clear the 32-bit system clock */
- #endif
- OSIntNesting = 0; /* Clear the interrupt nesting counter */
- OSLockNesting = 0; /* Clear the scheduling lock counter */
- OSTaskCtr = 0; /* Clear the number of tasks */
- OSRunning = FALSE; /* Indicate that multitasking not started */
-
- OSCtxSwCtr = 0; /* Clear the context switch counter */
- OSIdleCtr = 0L; /* Clear the 32-bit idle counter */
- #if (OS_TASK_STAT_EN > 0) && (OS_TASK_CREATE_EXT_EN > 0)
- OSIdleCtrRun = 0L;
- OSIdleCtrMax = 0L;
- OSStatRdy = FALSE; /* Statistic task is not ready */
- #endif
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * INITIALIZATION
- * INITIALIZE THE READY LIST
- *
- * Description: This function is called by OSInit() to initialize the Ready List.
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- static void OS_InitRdyList (void)
- {
- INT16U i;
- INT8U *prdytbl;
- OSRdyGrp = 0x00; /* Clear the ready list */
- prdytbl = &OSRdyTbl[0];
- for (i = 0; i < OS_RDY_TBL_SIZE; i++) {
- *prdytbl++ = 0x00;
- }
- OSPrioCur = 0;
- OSPrioHighRdy = 0;
- OSTCBHighRdy = (OS_TCB *)0;
- OSTCBCur = (OS_TCB *)0;
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * INITIALIZATION
- * CREATING THE IDLE TASK
- *
- * Description: This function creates the Idle Task.
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- static void OS_InitTaskIdle (void)
- {
- #if OS_TASK_CREATE_EXT_EN > 0
- #if OS_STK_GROWTH == 1
- (void)OSTaskCreateExt(OS_TaskIdle,
- (void *)0, /* No arguments passed to OS_TaskIdle() */
- &OSTaskIdleStk[OS_TASK_IDLE_STK_SIZE - 1], /* Set Top-Of-Stack */
- OS_IDLE_PRIO, /* Lowest priority level */
- OS_TASK_IDLE_ID,
- &OSTaskIdleStk[0], /* Set Bottom-Of-Stack */
- OS_TASK_IDLE_STK_SIZE,
- (void *)0, /* No TCB extension */
- OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);/* Enable stack checking + clear stack */
- #else
- (void)OSTaskCreateExt(OS_TaskIdle,
- (void *)0, /* No arguments passed to OS_TaskIdle() */
- &OSTaskIdleStk[0], /* Set Top-Of-Stack */
- OS_IDLE_PRIO, /* Lowest priority level */
- OS_TASK_IDLE_ID,
- &OSTaskIdleStk[OS_TASK_IDLE_STK_SIZE - 1], /* Set Bottom-Of-Stack */
- OS_TASK_IDLE_STK_SIZE,
- (void *)0, /* No TCB extension */
- OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);/* Enable stack checking + clear stack */
- #endif
- #else
- #if OS_STK_GROWTH == 1
- (void)OSTaskCreate(OS_TaskIdle,
- (void *)0,
- &OSTaskIdleStk[OS_TASK_IDLE_STK_SIZE - 1],
- OS_IDLE_PRIO);
- #else
- (void)OSTaskCreate(OS_TaskIdle,
- (void *)0,
- &OSTaskIdleStk[0],
- OS_IDLE_PRIO);
- #endif
- #endif
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * INITIALIZATION
- * CREATING THE STATISTIC TASK
- *
- * Description: This function creates the Statistic Task.
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- #if OS_TASK_STAT_EN > 0
- static void OS_InitTaskStat (void)
- {
- #if OS_TASK_CREATE_EXT_EN > 0
- #if OS_STK_GROWTH == 1
- (void)OSTaskCreateExt(OS_TaskStat,
- (void *)0, /* No args passed to OS_TaskStat()*/
- &OSTaskStatStk[OS_TASK_STAT_STK_SIZE - 1], /* Set Top-Of-Stack */
- OS_STAT_PRIO, /* One higher than the idle task */
- OS_TASK_STAT_ID,
- &OSTaskStatStk[0], /* Set Bottom-Of-Stack */
- OS_TASK_STAT_STK_SIZE,
- (void *)0, /* No TCB extension */
- OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR); /* Enable stack checking + clear */
- #else
- (void)OSTaskCreateExt(OS_TaskStat,
- (void *)0, /* No args passed to OS_TaskStat()*/
- &OSTaskStatStk[0], /* Set Top-Of-Stack */
- OS_STAT_PRIO, /* One higher than the idle task */
- OS_TASK_STAT_ID,
- &OSTaskStatStk[OS_TASK_STAT_STK_SIZE - 1], /* Set Bottom-Of-Stack */
- OS_TASK_STAT_STK_SIZE,
- (void *)0, /* No TCB extension */
- OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR); /* Enable stack checking + clear */
- #endif
- #else
- #if OS_STK_GROWTH == 1
- (void)OSTaskCreate(OS_TaskStat,
- (void *)0, /* No args passed to OS_TaskStat()*/
- &OSTaskStatStk[OS_TASK_STAT_STK_SIZE - 1], /* Set Top-Of-Stack */
- OS_STAT_PRIO); /* One higher than the idle task */
- #else
- (void)OSTaskCreate(OS_TaskStat,
- (void *)0, /* No args passed to OS_TaskStat()*/
- &OSTaskStatStk[0], /* Set Top-Of-Stack */
- OS_STAT_PRIO); /* One higher than the idle task */
- #endif
- #endif
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * INITIALIZATION
- * INITIALIZE THE FREE LIST OF TASK CONTROL BLOCKS
- *
- * Description: This function is called by OSInit() to initialize the free list of OS_TCBs.
- *
- * Arguments : none
- *
- * Returns : none
- *********************************************************************************************************
- */
- static void OS_InitTCBList (void)
- {
- INT8U i;
- OS_TCB *ptcb1;
- OS_TCB *ptcb2;
- OSTCBList = (OS_TCB *)0; /* TCB Initialization */
- for (i = 0; i < (OS_LOWEST_PRIO + 1); i++) { /* Clear the priority table */
- OSTCBPrioTbl[i] = (OS_TCB *)0;
- }
- ptcb1 = &OSTCBTbl[0];
- ptcb2 = &OSTCBTbl[1];
- for (i = 0; i < (OS_MAX_TASKS + OS_N_SYS_TASKS - 1); i++) { /* Init. list of free TCBs */
- ptcb1->OSTCBNext = ptcb2;
- ptcb1++;
- ptcb2++;
- }
- ptcb1->OSTCBNext = (OS_TCB *)0; /* Last OS_TCB */
- OSTCBFreeList = &OSTCBTbl[0];
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * SCHEDULER
- *
- * Description: This function is called by other uC/OS-II services to determine whether a new, high
- * priority task has been made ready to run. This function is invoked by TASK level code
- * and is not used to reschedule tasks from ISRs (see OSIntExit() for ISR rescheduling).
- *
- * Arguments : none
- *
- * Returns : none
- *
- * Notes : 1) This function is INTERNAL to uC/OS-II and your application should not call it.
- * 2) Rescheduling is prevented when the scheduler is locked (see OS_SchedLock())
- *********************************************************************************************************
- */
- void OS_Sched (void)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- INT8U y;
- OS_ENTER_CRITICAL();
- if ((OSIntNesting == 0) && (OSLockNesting == 0)) { /* Sched. only if all ISRs done & not locked */
- y = OSUnMapTbl[OSRdyGrp]; /* Get pointer to HPT ready to run */
- OSPrioHighRdy = (INT8U)((y << 3) + OSUnMapTbl[OSRdyTbl[y]]);
- if (OSPrioHighRdy != OSPrioCur) { /* No Ctx Sw if current task is highest rdy */
- OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
- OSCtxSwCtr++; /* Increment context switch counter */
- OS_TASK_SW(); /* Perform a context switch */
- }
- }
- OS_EXIT_CRITICAL();
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * IDLE TASK
- *
- * Description: This task is internal to uC/OS-II and executes whenever no other higher priority tasks
- * executes because they are ALL waiting for event(s) to occur.
- *
- * Arguments : none
- *
- * Returns : none
- *
- * Note(s) : 1) OSTaskIdleHook() is called after the critical section to ensure that interrupts will be
- * enabled for at least a few instructions. On some processors (ex. Philips XA), enabling
- * and then disabling interrupts didn't allow the processor enough time to have interrupts
- * enabled before they were disabled again. uC/OS-II would thus never recognize
- * interrupts.
- * 2) This hook has been added to allow you to do such things as STOP the CPU to conserve
- * power.
- *********************************************************************************************************
- */
- void OS_TaskIdle (void *pdata)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
-
-
- pdata = pdata; /* Prevent compiler warning for not using 'pdata' */
- for (;;) {
- OS_ENTER_CRITICAL();
- OSIdleCtr++;
- OS_EXIT_CRITICAL();
- OSTaskIdleHook(); /* Call user definable HOOK */
- }
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * STATISTICS TASK
- *
- * Description: This task is internal to uC/OS-II and is used to compute some statistics about the
- * multitasking environment. Specifically, OS_TaskStat() computes the CPU usage.
- * CPU usage is determined by:
- *
- * OSIdleCtr
- * OSCPUUsage = 100 * (1 - ------------) (units are in %)
- * OSIdleCtrMax
- *
- * Arguments : pdata this pointer is not used at this time.
- *
- * Returns : none
- *
- * Notes : 1) This task runs at a priority level higher than the idle task. In fact, it runs at the
- * next higher priority, OS_IDLE_PRIO-1.
- * 2) You can disable this task by setting the configuration #define OS_TASK_STAT_EN to 0.
- * 3) We delay for 5 seconds in the beginning to allow the system to reach steady state and
- * have all other tasks created before we do statistics. You MUST have at least a delay
- * of 2 seconds to allow for the system to establish the maximum value for the idle
- * counter.
- *********************************************************************************************************
- */
- #if OS_TASK_STAT_EN > 0
- void OS_TaskStat (void *pdata)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- INT32U run;
- INT32U max;
- INT8S usage;
- pdata = pdata; /* Prevent compiler warning for not using 'pdata' */
- while (OSStatRdy == FALSE) {
- OSTimeDly(2 * OS_TICKS_PER_SEC); /* Wait until statistic task is ready */
- }
- max = OSIdleCtrMax / 100L;
- for (;;) {
- OS_ENTER_CRITICAL();
- OSIdleCtrRun = OSIdleCtr; /* Obtain the of the idle counter for the past second */
- run = OSIdleCtr;
- OSIdleCtr = 0L; /* Reset the idle counter for the next second */
- OS_EXIT_CRITICAL();
- if (max > 0L) {
- usage = (INT8S)(100L - run / max);
- if (usage >= 0) { /* Make sure we don't have a negative percentage */
- OSCPUUsage = usage;
- } else {
- OSCPUUsage = 0;
- }
- } else {
- OSCPUUsage = 0;
- max = OSIdleCtrMax / 100L;
- }
- OSTaskStatHook(); /* Invoke user definable hook */
- OSTimeDly(OS_TICKS_PER_SEC); /* Accumulate OSIdleCtr for the next second */
- }
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * INITIALIZE TCB
- *
- * Description: This function is internal to uC/OS-II and is used to initialize a Task Control Block when
- * a task is created (see OSTaskCreate() and OSTaskCreateExt()).
- *
- * Arguments : prio is the priority of the task being created
- *
- * ptos is a pointer to the task's top-of-stack assuming that the CPU registers
- * have been placed on the stack. Note that the top-of-stack corresponds to a
- * 'high' memory location is OS_STK_GROWTH is set to 1 and a 'low' memory
- * location if OS_STK_GROWTH is set to 0. Note that stack growth is CPU
- * specific.
- *
- * pbos is a pointer to the bottom of stack. A NULL pointer is passed if called by
- * 'OSTaskCreate()'.
- *
- * id is the task's ID (0..65535)
- *
- * stk_size is the size of the stack (in 'stack units'). If the stack units are INT8Us
- * then, 'stk_size' contains the number of bytes for the stack. If the stack
- * units are INT32Us then, the stack contains '4 * stk_size' bytes. The stack
- * units are established by the #define constant OS_STK which is CPU
- * specific. 'stk_size' is 0 if called by 'OSTaskCreate()'.
- *
- * pext is a pointer to a user supplied memory area that is used to extend the task
- * control block. This allows you to store the contents of floating-point
- * registers, MMU registers or anything else you could find useful during a
- * context switch. You can even assign a name to each task and store this name
- * in this TCB extension. A NULL pointer is passed if called by OSTaskCreate().
- *
- * opt options as passed to 'OSTaskCreateExt()' or,
- * 0 if called from 'OSTaskCreate()'.
- *
- * Returns : OS_NO_ERR if the call was successful
- * OS_NO_MORE_TCB if there are no more free TCBs to be allocated and thus, the task cannot
- * be created.
- *
- * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
- *********************************************************************************************************
- */
- INT8U OS_TCBInit (INT8U prio, OS_STK *ptos, OS_STK *pbos, INT16U id, INT32U stk_size, void *pext, INT16U opt)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- OS_TCB *ptcb;
- OS_ENTER_CRITICAL();
- ptcb = OSTCBFreeList; /* Get a free TCB from the free TCB list */
- if (ptcb != (OS_TCB *)0) {
- OSTCBFreeList = ptcb->OSTCBNext; /* Update pointer to free TCB list */
- OS_EXIT_CRITICAL();
- ptcb->OSTCBStkPtr = ptos; /* Load Stack pointer in TCB */
- ptcb->OSTCBPrio = (INT8U)prio; /* Load task priority into TCB */
- ptcb->OSTCBStat = OS_STAT_RDY; /* Task is ready to run */
- ptcb->OSTCBDly = 0; /* Task is not delayed */
- #if OS_TASK_CREATE_EXT_EN > 0
- ptcb->OSTCBExtPtr = pext; /* Store pointer to TCB extension */
- ptcb->OSTCBStkSize = stk_size; /* Store stack size */
- ptcb->OSTCBStkBottom = pbos; /* Store pointer to bottom of stack */
- ptcb->OSTCBOpt = opt; /* Store task options */
- ptcb->OSTCBId = id; /* Store task ID */
- #else
- pext = pext; /* Prevent compiler warning if not used */
- stk_size = stk_size;
- pbos = pbos;
- opt = opt;
- id = id;
- #endif
- #if OS_TASK_DEL_EN > 0
- ptcb->OSTCBDelReq = OS_NO_ERR;
- #endif
- ptcb->OSTCBY = prio >> 3; /* Pre-compute X, Y, BitX and BitY */
- ptcb->OSTCBBitY = OSMapTbl[ptcb->OSTCBY];
- ptcb->OSTCBX = prio & 0x07;
- ptcb->OSTCBBitX = OSMapTbl[ptcb->OSTCBX];
- #if OS_EVENT_EN > 0
- ptcb->OSTCBEventPtr = (OS_EVENT *)0; /* Task is not pending on an event */
- #endif
- #if (OS_VERSION >= 251) && (OS_FLAG_EN > 0) && (OS_MAX_FLAGS > 0) && (OS_TASK_DEL_EN > 0)
- ptcb->OSTCBFlagNode = (OS_FLAG_NODE *)0; /* Task is not pending on an event flag */
- #endif
- #if (OS_MBOX_EN > 0) || ((OS_Q_EN > 0) && (OS_MAX_QS > 0))
- ptcb->OSTCBMsg = (void *)0; /* No message received */
- #endif
- #if OS_VERSION >= 204
- OSTCBInitHook(ptcb);
- #endif
- OSTaskCreateHook(ptcb); /* Call user defined hook */
-
- OS_ENTER_CRITICAL();
- OSTCBPrioTbl[prio] = ptcb;
- ptcb->OSTCBNext = OSTCBList; /* Link into TCB chain */
- ptcb->OSTCBPrev = (OS_TCB *)0;
- if (OSTCBList != (OS_TCB *)0) {
- OSTCBList->OSTCBPrev = ptcb;
- }
- OSTCBList = ptcb;
- OSRdyGrp |= ptcb->OSTCBBitY; /* Make task ready to run */
- OSRdyTbl[ptcb->OSTCBY] |= ptcb->OSTCBBitX;
- OS_EXIT_CRITICAL();
- return (OS_NO_ERR);
- }
- OS_EXIT_CRITICAL();
- return (OS_NO_MORE_TCB);
- }