/*
*********************************************************************************************************
* TASK SWITCH HOOK
*********************************************************************************************************
*/
void OSTaskSwHook (void)
{
INT32U time;
TASK_USER_DATA *puser;
time = PC_ElapsedStop(0); /* This task is done */
PC_ElapsedStart(0); /* Start for next task */
puser = OSTCBCur->OSTCBExtPtr; /* Point to used data */
if (puser != (TASK_USER_DATA *)0) {
puser->TaskCtr++; /* Increment task counter */
puser->TaskExecTime = (INT16U) time; /* Update the task's execution time */
puser->TaskTotExecTime += time; /* Update the task's total execution time */
}
}
/*
*********************************************************************************************************
* ELAPSED TIME INITIALIZATION
*
* Description : This function initialize the elapsed time module by determining how long the START and
* STOP functions take to execute. In other words, this function calibrates this module
* to account for the processing time of the START and STOP functions.
* Needs to be called only once before any of the timers is started with PC_ElapsedStart().
*
* Arguments : None.
*
* Returns : None.
*********************************************************************************************************
*/
void PC_ElapsedInit(void)
{ static BOOLEAN initDone=FALSE;
int i;
if (initDone)
return;
printf("INFO: Please wait - timer calibration may take up to 4 secs\n");
for (i=0; i < 4; i++)
{ PC_frequency += countsPerSecond();
}
PC_frequency = PC_frequency >> 2;
PC_ElapsedOverhead = 0; // Measure the overhead of PC_ElapsedStart
PC_ElapsedStart(0); // ... and PC_ElapsedStop
PC_ElapsedOverhead = (INT16U) PC_ElapsedStop(0);
initDone=TRUE;
}
//allows us to measure the execution time of each task,
//keeps track of how often each task executes
//and accumulates total execution times of each task
//****OSTaskSwHook() is called when UCOSII switches from a low priority task to a higher priority task
void OSTaskSwHook (void)
{
INT16U time;
TASK_USER_DATA *puser;
time = PC_ElapsedStop(); /* This task is done */
PC_ElapsedStart(); /* Start for next task */
//global pointer OSTCBCur points to the TCB of the current task
//that's the last second paramter in OSTaskCreateExt()
puser = OSTCBCur->OSTCBExtPtr; /* Point to used data */
//check if the pointer is not NULL
//the two default tasks: idle task and statistic task do not contain a TCB externsion pointer
if (puser != (TASK_USER_DATA *)0) {
//calculate how many times this task being called
puser->TaskCtr++; /* Increment task counter */
puser->TaskExecTime = time; /* Update the task's execution time */
puser->TaskTotExecTime += time; /* Update the task's total execution time */
}
}
/*
*********************************************************************************************************
* ELAPSED TIME INITIALIZATION
*
* Description : This function initialize the elapsed time module by determining how long the START and
* STOP functions take to execute. In other words, this function calibrates this module
* to account for the processing time of the START and STOP functions.
*
* Arguments : None.
*
* Returns : None.
*********************************************************************************************************
*/
void PC_ElapsedInit(void)
{
PC_ElapsedOverhead = 0;
PC_ElapsedStart();
PC_ElapsedOverhead = PC_ElapsedStop();
}
