📄 os_flag.lst
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#endif
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) { /* Validate 'perr' */
return ((OS_FLAGS)0);
}
if (pgrp == (OS_FLAG_GRP *)0) { /* Validate 'pgrp' */
*perr = OS_ERR_FLAG_INVALID_PGRP;
return ((OS_FLAGS)0);
}
#endif
if (pgrp->OSFlagType != OS_EVENT_TYPE_FLAG) { /* Make sure we are pointing to an event flag grp */
*perr = OS_ERR_EVENT_TYPE;
return ((OS_FLAGS)0);
}
/*$PAGE*/
OS_ENTER_CRITICAL();
switch (opt) {
case OS_FLAG_CLR:
pgrp->OSFlagFlags &= ~flags; /* Clear the flags specified in the group */
break;
case OS_FLAG_SET:
pgrp->OSFlagFlags |= flags; /* Set the flags specified in the group */
break;
default:
OS_EXIT_CRITICAL(); /* INVALID option */
*perr = OS_ERR_FLAG_INVALID_OPT;
return ((OS_FLAGS)0);
}
sched = OS_FALSE; /* Indicate that we don't need rescheduling */
pnode = (OS_FLAG_NODE *)pgrp->OSFlagWaitList;
while (pnode != (OS_FLAG_NODE *)0) { /* Go through all tasks waiting on event flag(s) */
switch (pnode->OSFlagNodeWaitType) {
case OS_FLAG_WAIT_SET_ALL: /* See if all req. flags are set for current node */
flags_rdy = (OS_FLAGS)(pgrp->OSFlagFlags & pnode->OSFlagNodeFlags);
if (flags_rdy == pnode->OSFlagNodeFlags) {
rdy = OS_FlagTaskRdy(pnode, flags_rdy); /* Make task RTR, event(s) Rx'd */
if (rdy == OS_TRUE) {
sched = OS_TRUE; /* When done we will reschedule */
}
}
break;
case OS_FLAG_WAIT_SET_ANY: /* See if any flag set */
flags_rdy = (OS_FLAGS)(pgrp->OSFlagFlags & pnode->OSFlagNodeFlags);
if (flags_rdy != (OS_FLAGS)0) {
rdy = OS_FlagTaskRdy(pnode, flags_rdy); /* Make task RTR, event(s) Rx'd */
if (rdy == OS_TRUE) {
C51 COMPILER V8.17 OS_FLAG 03/26/2009 14:24:24 PAGE 15
sched = OS_TRUE; /* When done we will reschedule */
}
}
break;
#if OS_FLAG_WAIT_CLR_EN > 0
case OS_FLAG_WAIT_CLR_ALL: /* See if all req. flags are set for current node */
flags_rdy = (OS_FLAGS)(~pgrp->OSFlagFlags & pnode->OSFlagNodeFlags);
if (flags_rdy == pnode->OSFlagNodeFlags) {
rdy = OS_FlagTaskRdy(pnode, flags_rdy); /* Make task RTR, event(s) Rx'd */
if (rdy == OS_TRUE) {
sched = OS_TRUE; /* When done we will reschedule */
}
}
break;
case OS_FLAG_WAIT_CLR_ANY: /* See if any flag set */
flags_rdy = (OS_FLAGS)(~pgrp->OSFlagFlags & pnode->OSFlagNodeFlags);
if (flags_rdy != (OS_FLAGS)0) {
rdy = OS_FlagTaskRdy(pnode, flags_rdy); /* Make task RTR, event(s) Rx'd */
if (rdy == OS_TRUE) {
sched = OS_TRUE; /* When done we will reschedule */
}
}
break;
#endif
default:
OS_EXIT_CRITICAL();
*perr = OS_ERR_FLAG_WAIT_TYPE;
return ((OS_FLAGS)0);
}
pnode = (OS_FLAG_NODE *)pnode->OSFlagNodeNext; /* Point to next task waiting for event flag(s) */
}
OS_EXIT_CRITICAL();
if (sched == OS_TRUE) {
OS_Sched();
}
OS_ENTER_CRITICAL();
flags_cur = pgrp->OSFlagFlags;
OS_EXIT_CRITICAL();
*perr = OS_ERR_NONE;
return (flags_cur);
}
/*$PAGE*/
/*
*********************************************************************************************************
* QUERY EVENT FLAG
*
* Description: This function is used to check the value of the event flag group.
*
* Arguments : pgrp is a pointer to the desired event flag group.
*
* perr is a pointer to an error code returned to the called:
* OS_ERR_NONE The call was successfull
* OS_ERR_FLAG_INVALID_PGRP You passed a NULL pointer
* OS_ERR_EVENT_TYPE You are not pointing to an event flag group
*
* Returns : The current value of the event flag group.
*
* Called From: Task or ISR
*********************************************************************************************************
*/
C51 COMPILER V8.17 OS_FLAG 03/26/2009 14:24:24 PAGE 16
#if OS_FLAG_QUERY_EN > 0
OS_FLAGS OSFlagQuery (OS_FLAG_GRP *pgrp, INT8U *perr) reentrant
{
OS_FLAGS flags;
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr = 0;
#endif
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) { /* Validate 'perr' */
return ((OS_FLAGS)0);
}
if (pgrp == (OS_FLAG_GRP *)0) { /* Validate 'pgrp' */
*perr = OS_ERR_FLAG_INVALID_PGRP;
return ((OS_FLAGS)0);
}
#endif
if (pgrp->OSFlagType != OS_EVENT_TYPE_FLAG) { /* Validate event block type */
*perr = OS_ERR_EVENT_TYPE;
return ((OS_FLAGS)0);
}
OS_ENTER_CRITICAL();
flags = pgrp->OSFlagFlags;
OS_EXIT_CRITICAL();
*perr = OS_ERR_NONE;
return (flags); /* Return the current value of the event flags */
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* SUSPEND TASK UNTIL EVENT FLAG(s) RECEIVED OR TIMEOUT OCCURS
*
* Description: This function is internal to uC/OS-II and is used to put a task to sleep until the desired
* event flag bit(s) are set.
*
* Arguments : pgrp is a pointer to the desired event flag group.
*
* pnode is a pointer to a structure which contains data about the task waiting for
* event flag bit(s) to be set.
*
* flags Is a bit pattern indicating which bit(s) (i.e. flags) you wish to check.
* The bits you want are specified by setting the corresponding bits in
* 'flags'. e.g. if your application wants to wait for bits 0 and 1 then
* 'flags' would contain 0x03.
*
* wait_type specifies whether you want ALL bits to be set/cleared or ANY of the bits
* to be set/cleared.
* You can specify the following argument:
*
* OS_FLAG_WAIT_CLR_ALL You will check ALL bits in 'mask' to be clear (0)
* OS_FLAG_WAIT_CLR_ANY You will check ANY bit in 'mask' to be clear (0)
* OS_FLAG_WAIT_SET_ALL You will check ALL bits in 'mask' to be set (1)
* OS_FLAG_WAIT_SET_ANY You will check ANY bit in 'mask' to be set (1)
*
* timeout is the desired amount of time that the task will wait for the event flag
* bit(s) to be set.
*
C51 COMPILER V8.17 OS_FLAG 03/26/2009 14:24:24 PAGE 17
* Returns : none
*
* Called by : OSFlagPend() OS_FLAG.C
*
* Note(s) : This function is INTERNAL to uC/OS-II and your application should not call it.
*********************************************************************************************************
*/
static void OS_FlagBlock (OS_FLAG_GRP *pgrp, OS_FLAG_NODE *pnode, OS_FLAGS flags, INT8U wait_type, INT16
-U timeout) reentrant
{
OS_FLAG_NODE *pnode_next;
INT8U y;
OSTCBCur->OSTCBStat |= OS_STAT_FLAG;
OSTCBCur->OSTCBStatPend = OS_STAT_PEND_OK;
OSTCBCur->OSTCBDly = timeout; /* Store timeout in task's TCB */
#if OS_TASK_DEL_EN > 0
OSTCBCur->OSTCBFlagNode = pnode; /* TCB to link to node */
#endif
pnode->OSFlagNodeFlags = flags; /* Save the flags that we need to wait for */
pnode->OSFlagNodeWaitType = wait_type; /* Save the type of wait we are doing */
pnode->OSFlagNodeTCB = (void *)OSTCBCur; /* Link to task's TCB */
pnode->OSFlagNodeNext = pgrp->OSFlagWaitList; /* Add node at beginning of event flag wait list */
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