?? os_core.c
字號:
*
* Returns : none
*********************************************************************************************************
*/
#if OS_TASK_STAT_EN
void OSStatInit (void) REENTRANT
{
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
/*$PAGE*/
/*
*********************************************************************************************************
* IDLE TASK
*
* Description: This task is internal to uC/OS-II and executes whenever no other higher priority tasks
* executes because they are waiting for event(s) to occur.
*
* Arguments : none
*
* Returns : none
*********************************************************************************************************
*/
void OSTaskIdle (void DT_XDATA * ppdata) REENTRANT
{
ppdata = ppdata; /* Prevent compiler warning for not using 'ppdata' */
for (;;) {
OS_ENTER_CRITICAL();
OSIdleCtr++;
OS_EXIT_CRITICAL();
}
}
/*$PAGE*/
/*
*********************************************************************************************************
* STATISTICS TASK
*
* Description: This task is internal to uC/OS-II and is used to compute some statistics about the
* multitasking environment. Specifically, OSTaskStat() computes the CPU usage.
* CPU usage is determined by:
*
* OSIdleCtr
* OSCPUUsage = 100 * (1 - ------------) (units are in %)
* OSIdleCtrMax
*
* Arguments : ppdata 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
void OSTaskStat (void DT_XDATA * ppdata) REENTRANT
{
INT32U run;
INT8S usage;
ppdata = ppdata; /* Prevent compiler warning for not using 'ppdata' */
while (OSStatRdy == FALSE) {
OSTimeDly(2 * OS_TICKS_PER_SEC); /* Wait until statistic task is ready */
}
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 (OSIdleCtrMax > 0L) {
usage = (INT8S)(100L - 100L * run / OSIdleCtrMax);
if (usage > 100) {
OSCPUUsage = 100;
} else if (usage < 0) {
OSCPUUsage = 0;
} else {
OSCPUUsage = usage;
}
} else {
OSCPUUsage = 0;
}
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 OSTCBInit (INT8U prio, OS_STK DT_XDATA * ptos, OS_STK DT_XDATA * pbos, INT16U id, INT16U stk_size, void DT_XDATA * pext, INT16U opt) REENTRANT
{
OS_TCB DT_XDATA * ptcb;
OS_ENTER_CRITICAL();
/* Get a free TCB from the free TCB list */
ptcb = OSTCBFreeList;
if (ptcb != (OS_TCB DT_XDATA *)0) {
OSTCBFreeList = ptcb->OSTCBNext; /* Update pointer to free TCB list */
OS_EXIT_CRITICAL();
/* TCB member init */
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
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 */
pext = pext; /* Prevent compiler warning if not used */
stk_size = stk_size;
pbos = pbos;
opt = opt;
id = id;
#endif
#if OS_TASK_DEL_EN
ptcb->OSTCBDelReq = OS_NO_ERR;
#endif
/* Pre-compute X, Y, BitX and BitY */
ptcb->OSTCBY = prio >> 3;
ptcb->OSTCBBitY = OSMapTbl[ptcb->OSTCBY];
ptcb->OSTCBX = prio & 0x07;
ptcb->OSTCBBitX = OSMapTbl[ptcb->OSTCBX];
#if OS_MBOX_EN || (OS_Q_EN && (OS_MAX_QS >= 2)) || OS_SEM_EN
ptcb->OSTCBEventPtr = (OS_EVENT DT_XDATA *)0; /* Task is not pending on an event */
#endif
#if OS_MBOX_EN || (OS_Q_EN && (OS_MAX_QS >= 2))
ptcb->OSTCBMsg = (void DT_XDATA *)0; /* No message received */
#endif
OS_ENTER_CRITICAL();
/* OSTCBPrioTbl */
OSTCBPrioTbl[prio] = ptcb;
/* Link into TCB chain. insert to the first of chain */
ptcb->OSTCBNext = OSTCBList;
ptcb->OSTCBPrev = (OS_TCB DT_XDATA *)0;
if (OSTCBList != (OS_TCB DT_XDATA *)0) {
OSTCBList->OSTCBPrev = ptcb;
}
OSTCBList = ptcb;
/* Ready list */
OSRdyGrp |= ptcb->OSTCBBitY; /* Make task ready to run */
OSRdyTbl[ptcb->OSTCBY] |= ptcb->OSTCBBitX;
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
} else {
/* no more tcbs */
OS_EXIT_CRITICAL();
return (OS_NO_MORE_TCB);
}
}
/*$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) REENTRANT
{
OS_TCB DT_XDATA * ptcb;
OSTimeTickHook(); /* Call user definable hook */
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)) { /* Is task suspended? */
OSRdyGrp |= ptcb->OSTCBBitY; /* No, Make task Rdy to Run (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();
}
OS_ENTER_CRITICAL(); /* Update the 32-bit tick counter */
OSTime++;
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) REENTRANT
{
return (OS_VERSION);
}
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