?? os_tmr.c
字號:
if (ptmr->OSTmrType != OS_TMR_TYPE) { /* Validate timer structure */
*perr = OS_ERR_TMR_INVALID_TYPE;
return (0);
}
if (OSIntNesting > 0) { /* See if trying to call from an ISR */
*perr = OS_ERR_TMR_ISR;
return (0);
}
OSTmr_Lock();
switch (ptmr->OSTmrState) {
case OS_TMR_STATE_RUNNING:
remain = ptmr->OSTmrMatch - OSTmrTime; /* Determine how much time is left to timeout */
OSTmr_Unlock();
*perr = OS_NO_ERR;
return (remain);
case OS_TMR_STATE_STOPPED: /* It's assumed that the timer has not started yet */
switch (ptmr->OSTmrOpt) {
case OS_TMR_OPT_PERIODIC:
if (ptmr->OSTmrDly == 0) {
remain = ptmr->OSTmrPeriod;
} else {
remain = ptmr->OSTmrDly;
}
OSTmr_Unlock();
*perr = OS_NO_ERR;
break;
case OS_TMR_OPT_ONE_SHOT:
remain = ptmr->OSTmrDly;
OSTmr_Unlock();
*perr = OS_NO_ERR;
break;
}
return (remain);
case OS_TMR_STATE_COMPLETED: /* Only ONE-SHOT that timed out can be in this state */
OSTmr_Unlock();
*perr = OS_NO_ERR;
return (0);
case OS_TMR_STATE_UNUSED:
OSTmr_Unlock();
*perr = OS_ERR_TMR_INACTIVE;
return (0);
default:
OSTmr_Unlock();
*perr = OS_ERR_TMR_INVALID_STATE;
return (0);
}
}
#endif
/*$PAGE*/
/*
************************************************************************************************************************
* FIND OUT WHAT STATE A TIMER IS IN
*
* Description: This function is called to determine what state the timer is in:
*
* OS_TMR_STATE_UNUSED the timer has not been created
* OS_TMR_STATE_STOPPED the timer has been created but has not been started or has been stopped
* OS_TMR_COMPLETED the timer is in ONE-SHOT mode and has completed it's timeout
* OS_TMR_RUNNING the timer is currently running
*
* Arguments : ptmr Is a pointer to the desired timer
*
* perr Is a pointer to an error code. '*perr' will contain one of the following:
* OS_NO_ERR
* OS_ERR_TMR_INVALID 'ptmr' is a NULL pointer
* OS_ERR_TMR_INVALID_TYPE 'ptmr' is not pointing to an OS_TMR
* OS_ERR_TMR_ISR if the call was made from an ISR
* OS_ERR_TMR_INACTIVE 'ptmr' points to a timer that is not active
* OS_ERR_TMR_INVALID_STATE if the timer is not in a valid state
*
* Returns : The current state of the timer (see description).
************************************************************************************************************************
*/
#if OS_TMR_EN > 0
INT8U OSTmrStateGet (OS_TMR *ptmr,
INT8U *perr)
{
INT8U state;
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) {
return (0);
}
if (ptmr == (OS_TMR *)0) {
*perr = OS_ERR_TMR_INVALID;
return (0);
}
#endif
if (ptmr->OSTmrType != OS_TMR_TYPE) { /* Validate timer structure */
*perr = OS_ERR_TMR_INVALID_TYPE;
return (0);
}
if (OSIntNesting > 0) { /* See if trying to call from an ISR */
*perr = OS_ERR_TMR_ISR;
return (0);
}
OSTmr_Lock();
state = ptmr->OSTmrState;
switch (state) {
case OS_TMR_STATE_UNUSED:
case OS_TMR_STATE_STOPPED:
case OS_TMR_STATE_COMPLETED:
case OS_TMR_STATE_RUNNING:
*perr = OS_NO_ERR;
break;
default:
*perr = OS_ERR_TMR_INVALID_STATE;
break;
}
OSTmr_Unlock();
return (state);
}
#endif
/*$PAGE*/
/*
************************************************************************************************************************
* START A TIMER
*
* Description: This function is called by your application code to create and start a timer.
*
* Arguments : ptmr Is a pointer to an OS_TMR
*
* perr Is a pointer to an error code. '*perr' will contain one of the following:
* OS_NO_ERR
* OS_ERR_TMR_INVALID
* OS_ERR_TMR_INVALID_TYPE 'ptmr' is not pointing to an OS_TMR
* OS_ERR_TMR_ISR if the call was made from an ISR
* OS_ERR_TMR_INACTIVE if the timer was not created
* OS_ERR_TMR_INVALID_STATE the timer is in an invalid state
*
* Returns : OS_TRUE if the timer was started
* OS_FALSE if an error was detected
************************************************************************************************************************
*/
#if OS_TMR_EN > 0
BOOLEAN OSTmrStart (OS_TMR *ptmr,
INT8U *perr)
{
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) { /* Validate arguments */
return (OS_FALSE);
}
if (ptmr == (OS_TMR *)0) {
*perr = OS_ERR_TMR_INVALID;
return (OS_FALSE);
}
#endif
if (ptmr->OSTmrType != OS_TMR_TYPE) { /* Validate timer structure */
*perr = OS_ERR_TMR_INVALID_TYPE;
return (OS_FALSE);
}
if (OSIntNesting > 0) { /* See if trying to call from an ISR */
*perr = OS_ERR_TMR_ISR;
return (OS_FALSE);
}
OSTmr_Lock();
switch (ptmr->OSTmrState) {
case OS_TMR_STATE_RUNNING: /* Restart the timer */
OSTmr_Unlink(ptmr); /* ... Stop the timer */
OSTmr_Link(ptmr, OS_TMR_LINK_DLY); /* ... Link timer to timer wheel */
OSTmr_Unlock();
*perr = OS_NO_ERR;
return (OS_TRUE);
case OS_TMR_STATE_STOPPED: /* Start the timer */
case OS_TMR_STATE_COMPLETED:
OSTmr_Link(ptmr, OS_TMR_LINK_DLY); /* ... Link timer to timer wheel */
OSTmr_Unlock();
*perr = OS_NO_ERR;
return (OS_TRUE);
case OS_TMR_STATE_UNUSED: /* Timer not created */
OSTmr_Unlock();
*perr = OS_ERR_TMR_INACTIVE;
return (OS_FALSE);
default:
OSTmr_Unlock();
*perr = OS_ERR_TMR_INVALID_STATE;
return (OS_FALSE);
}
}
#endif
/*$PAGE*/
/*
************************************************************************************************************************
* STOP A TIMER
*
* Description: This function is called by your application code to stop and delete a timer.
*
* Arguments : ptmr Is a pointer to the timer to stop and delete.
*
* opt Allows you to specify an option to this functions which can be:
*
* OS_TMR_OPT_NONE Do nothing special but stop the timer
* OS_TMR_OPT_CALLBACK Execute the callback function, pass it the callback argument
* specified when the timer was created.
* OS_TMR_OPT_CALLBACK_ARG Execute the callback function, pass it the callback argument
* specified in THIS function call
*
* callback_arg Is a pointer to a 'new' callback argument that can be passed to the callback function
* instead of the timer's callback argument. In other words, use 'callback_arg' passed in
* THIS function INSTEAD of ptmr->OSTmrCallbackArg
*
* perr Is a pointer to an error code. '*perr' will contain one of the following:
* OS_NO_ERR
* OS_ERR_TMR_INVALID 'ptmr' is a NULL pointer
* OS_ERR_TMR_INVALID_TYPE 'ptmr' is not pointing to an OS_TMR
* OS_ERR_TMR_ISR if the function was called from an ISR
* OS_ERR_TMR_INACTIVE if the timer was not created
* OS_ERR_TMR_INVALID_OPT if you specified an invalid option for 'opt'
* OS_ERR_TMR_STOPPED if the timer was already stopped
* OS_ERR_TMR_INVALID_STATE the timer is in an invalid state
* OS_ERR_TMR_NO_CALLBACK if the timer does not have a callback function defined
*
* Returns : OS_TRUE If the call was successful (if the timer is already stopped, we also return OS_TRUE)
* OS_FALSE If not
************************************************************************************************************************
*/
#if OS_TMR_EN > 0
BOOLEAN OSTmrStop (OS_TMR *ptmr,
INT8U opt,
void *callback_arg,
INT8U *perr)
{
OS_TMR_CALLBACK pfnct;
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) { /* Validate arguments */
return (OS_FALSE);
}
if (ptmr == (OS_TMR *)0) {
*perr = OS_ERR_TMR_INVALID;
return (OS_FALSE);
}
#endif
if (ptmr->OSTmrType != OS_TMR_TYPE) { /* Validate timer structure */
*perr = OS_ERR_TMR_INVALID_TYPE;
return (OS_FALSE);
}
if (OSIntNesting > 0) { /* See if trying to call from an ISR */
*perr = OS_ERR_TMR_ISR;
return (OS_FALSE);
}
OSTmr_Lock();
switch (ptmr->OSTmrState) {
case OS_TMR_STATE_RUNNING:
OSTmr_Unlink(ptmr); /* Remove from current wheel spoke */
*perr = OS_NO_ERR;
switch (opt) {
case OS_TMR_OPT_CALLBACK:
pfnct = ptmr->OSTmrCallback; /* Execute callback function if available ... */
if (pfnct != (OS_TMR_CALLBACK)0) {
(*pfnct)(ptmr, ptmr->OSTmrCallbackArg); /* ... using the 'argument' specified @ creation */
} else {
*perr = OS_ERR_TMR_NO_CALLBACK;
return (OS_FALSE);
}
break;
case OS_TMR_OPT_CALLBACK_ARG:
pfnct = ptmr->OSTmrCallback; /* Execute callback function if available ... */
if (pfnct != (OS_TMR_CALLBACK)0) {
(*pfnct)(ptmr, callback_arg); /* ... using the 'callback_arg' provided in call */
} else {
*perr = OS_ERR_TMR_NO_CALLBACK;
return (OS_FALSE);
}
break;
case OS_TMR_OPT_NONE:
break;
default:
OSTmr_Unlock();
*perr = OS_ERR_TMR_INVALID_OPT;
return (OS_FALSE);
}
OSTmr_Unlock();
return (OS_TRUE);
case OS_TMR_STATE_COMPLETED: /* Timer has already completed the ONE-SHOT or ... */
case OS_TMR_STATE_STOPPED: /* ... timer has not started yet. */
OSTmr_Unlock();
*perr = OS_ERR_TMR_STOPPED;
return (OS_TRUE);
case OS_TMR_STATE_UNUSED: /* Timer was not created */
OSTmr_Unlock();
*perr = OS_ERR_TMR_INACTIVE;
return (OS_FALSE);
default:
OSTmr_Unlock();
*perr = OS_ERR_TMR_INVALID_STATE;
return (OS_FALSE);
}
}
#endif
/*$PAGE*/
/*
************************************************************************************************************************
* SIGNAL THAT IT'S TIME TO UPDATE THE TIMERS
*
* Description: This function is typically called by the ISR that occurs at the timer tick rate and is used to signal to
* OSTmr_Task() that it's time to update the timers.
*
* Arguments : none
*
* Returns : none
************************************************************************************************************************
*/
#if OS_TMR_EN > 0
INT8U OSTmrSignal (void)
{
INT8U err;
err = OSSemPost(OSTmrSemSignal);
return (err);
}
#endif
/*$PAGE*/
/*
************************************************************************************************************************
* ALLOCATE AND FREE A TIMER
*
* Description: This function is called to allocate a timer.
*
* Arguments : none
*
* Returns : a pointer to a timer if one is available
************************************************************************************************************************
*/
#if OS_TMR_EN > 0
static OS_TMR *OSTmr_Alloc (void)
{
OS_TMR *ptmr;
if (OSTmrFreeList == (OS_TMR *)0) {
return ((OS_TMR *)0);
}
ptmr = (OS_TMR *)OSTmrFreeList;
OSTmrFreeList = (OS_TMR *)ptmr->OSTmrNext;
ptmr->OSTmrNext = (OS_TCB *)0;
ptmr->OSTmrPrev = (OS_TCB *)0;
OSTmrUsed++;
OSTmrFree--;
return (ptmr);
}
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