os_cpu_c.c

第3章－μCOS-II基础实验 3.2－GPIO实验 3.3－时器实验 3.4－PWM实验 3.5－RTC实验 3.6－信号量使用

    ptcb            = OSTCBPrioTbl[OS_STAT_PRIO];
    ptcb->OSTCBOpt |= OS_TASK_OPT_SAVE_FP;         /* Allow floating-point support for Statistic task  */
    pblk            = OSMemGet(OSFPPartPtr, &err); /* Get storage for FPU registers                    */
    if (pblk != (void *)0) {                       /* Did we get a memory block?                       */
        ptcb->OSTCBExtPtr = pblk;                  /* Yes, Link to task's TCB                          */
        OSFPSave(pblk);                            /*      Save the FPU registers in block             */
    }
#endif
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                          TASK CREATION HOOK
*
* Description: This function is called when a task is created.
*
* Arguments  : ptcb   is a pointer to the task control block of the task being created.
*
* Note(s)    : 1) Interrupts are disabled during this call.
*              2) I decided to change the options on the statistic task to allow for floating-point in
*                 case you decide to do math. in OSTaskStatHook().
*********************************************************************************************************
*/
void OSTaskCreateHook (OS_TCB *ptcb)
{
    INT8U  err;
    void  *pblk;
    
    
    if (ptcb->OSTCBOpt & OS_TASK_OPT_SAVE_FP) {  /* See if task needs FP support                      */
        pblk = OSMemGet(OSFPPartPtr, &err);      /* Yes, Get storage for FPU registers                */
        if (pblk != (void *)0) {                 /*      Did we get a memory block?                   */
            ptcb->OSTCBExtPtr = pblk;            /*      Yes, Link to task's TCB                      */
            OSFPSave(pblk);                      /*           Save the FPU registers in block         */
        }
    }
}


/*
*********************************************************************************************************
*                                           TASK DELETION HOOK
*
* Description: This function is called when a task is deleted.
*
* Arguments  : ptcb   is a pointer to the task control block of the task being deleted.
*
* Note(s)    : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
void OSTaskDelHook (OS_TCB *ptcb)
{
    if (ptcb->OSTCBOpt & OS_TASK_OPT_SAVE_FP) {            /* See if task had FP support               */
        if (ptcb->OSTCBExtPtr != (void *)0) {              /* Yes, OSTCBExtPtr must not be NULL        */
            OSMemPut(OSFPPartPtr, ptcb->OSTCBExtPtr);      /*      Return memory block to free pool    */
        }
    }
}

/*
*********************************************************************************************************
*                                           TASK SWITCH HOOK
*
* Description: This function is called when a task switch is performed.  This allows you to perform other
*              operations during a context switch.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts are disabled during this call.
*              2) It is assumed that the global pointer 'OSTCBHighRdy' points to the TCB of the task that
*                 will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCur' points to the 
*                 task being switched out (i.e. the preempted task).
*********************************************************************************************************
*/
void OSTaskSwHook (void)
{
    INT8U  err;
    void  *pblk;
                                                           /* Save FPU context of preempted task       */
    if (OSRunning) {                                       /* Don't save on OSStart()!                 */
        if (OSTCBCur->OSTCBOpt & OS_TASK_OPT_SAVE_FP) {    /* See if task used FP                      */
            pblk = OSTCBCur->OSTCBExtPtr;                  /* Yes, Get pointer to FP storage area      */
            if (pblk != (void *)0) {                       /*      Make sure we have storage           */
                OSFPSave(pblk);                            /*      Save the FPU registers in block     */
            }
        }
    }
                                                           /* Restore FPU context of new task          */
    if (OSTCBHighRdy->OSTCBOpt & OS_TASK_OPT_SAVE_FP) {    /* See if new task uses FP                  */
        pblk = OSTCBHighRdy->OSTCBExtPtr;                  /* Yes, Get pointer to FP storage area      */
        if (pblk != (void *)0) {                           /*      Make sure we have storage           */
            OSFPRestore(pblk);                             /*      Get contents of FPU registers       */
        }
    }
}

/*
*********************************************************************************************************
*                                           STATISTIC TASK HOOK
*
* Description: This function is called every second by uC/OS-II's statistics task.  This allows your 
*              application to add functionality to the statistics task.
*
* Arguments  : none
*********************************************************************************************************
*/
void OSTaskStatHook (void)
{
}

/*
*********************************************************************************************************
*                                           OSTCBInit() HOOK
*
* Description: This function is called by OSTCBInit() after setting up most of the TCB.
*
* Arguments  : ptcb    is a pointer to the TCB of the task being created.
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
#if OS_VERSION > 203
void OSTCBInitHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                                           /* Prevent Compiler warning                 */
}
#endif


/*
*********************************************************************************************************
*                                               TICK HOOK
*
* Description: This function is called every tick.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{
}


/*
*********************************************************************************************************
*                                             IDLE TASK HOOK
*
* Description: This function is called by the idle task.  This hook has been added to allow you to do  
*              such things as STOP the CPU to conserve power.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts are enabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION >= 205
void OSTaskIdleHook (void)
{
}
#endif
#endif