?? os_flag.lst
字號:
flags_rdy = ~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 == TRUE) {
sched = TRUE; /* When done we will reschedule */
}
}
break;
#endif
default:
OS_EXIT_CRITICAL();
*err = OS_FLAG_ERR_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 == TRUE) {
OS_Sched();
}
OS_ENTER_CRITICAL();
flags_cur = pgrp->OSFlagFlags;
OS_EXIT_CRITICAL();
*err = OS_NO_ERR;
return (flags_cur);
}
/*$PAGE*/
/*
*********************************************************************************************************
* QUERY EVENT FLAG
*
* Description: This function is used to check the value of the event flag group.
*
* Arguments : pgrp is a pointer to the desired event flag group.
*
* err is a pointer to an error code returned to the called:
* OS_NO_ERR The call was successfull
* OS_FLAG_INVALID_PGRP You passed a NULL pointer
* OS_ERR_EVENT_TYPE You are not pointing to an event flag group
*
* Returns : The current value of the event flag group.
*
* Called From: Task or ISR
*********************************************************************************************************
*/
#if OS_FLAG_QUERY_EN > 0
OS_FLAGS OSFlagQuery (OS_FLAG_GRP *pgrp, INT8U *err) KCREENTRANT
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
OS_FLAGS flags;
#if OS_ARG_CHK_EN > 0
if (pgrp == (OS_FLAG_GRP *)0) { /* Validate 'pgrp' */
*err = OS_FLAG_INVALID_PGRP;
return ((OS_FLAGS)0);
}
C51 COMPILER V8.05a OS_FLAG 04/11/2007 16:19:49 PAGE 15
#endif
if (pgrp->OSFlagType != OS_EVENT_TYPE_FLAG) { /* Validate event block type */
*err = OS_ERR_EVENT_TYPE;
return ((OS_FLAGS)0);
}
OS_ENTER_CRITICAL();
flags = pgrp->OSFlagFlags;
OS_EXIT_CRITICAL();
*err = OS_NO_ERR;
return (flags); /* Return the current value of the event flags */
}
#endif
/*$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.
*
* 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) KCREENTRANT
{
OS_FLAG_NODE *pnode_next;
INT8U y;
OSTCBCur->OSTCBStat |= OS_STAT_FLAG;
OSTCBCur->OSTCBDly = timeout; /* Store timeout in task's TCB */
#if OS_TASK_DEL_EN > 0
OSTCBCur->OSTCBFlagNode = pnode; /* TCB to link to node */
C51 COMPILER V8.05a OS_FLAG 04/11/2007 16:19:49 PAGE 16
#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 */
pnode->OSFlagNodePrev = (void *)0;
pnode->OSFlagNodeFlagGrp = (void *)pgrp; /* Link to Event Flag Group */
pnode_next = (OS_FLAG_NODE *)pgrp->OSFlagWaitList;
if (pnode_next != (void *)0) { /* Is this the first NODE to insert? */
pnode_next->OSFlagNodePrev = pnode; /* No, link in doubly linked list */
}
pgrp->OSFlagWaitList = (void *)pnode;
y = OSTCBCur->OSTCBY; /* Suspend current task until flag(s) received */
OSRdyTbl[y] &= ~OSTCBCur->OSTCBBitX;
if (OSRdyTbl[y] == 0x00) {
OSRdyGrp &= ~OSTCBCur->OSTCBBitY;
}
}
/*$PAGE*/
/*
*********************************************************************************************************
* INITIALIZE THE EVENT FLAG MODULE
*
* Description: This function is called by uC/OS-II to initialize the event flag module. Your application
* MUST NOT call this function. In other words, this function is internal to uC/OS-II.
*
* Arguments : none
*
* Returns : none
*
* WARNING : You MUST NOT call this function from your code. This is an INTERNAL function to uC/OS-II.
*********************************************************************************************************
*/
void OS_FlagInit (void) KCREENTRANT
{
#if OS_MAX_FLAGS == 1
OSFlagFreeList = (OS_FLAG_GRP *)&OSFlagTbl[0]; /* Only ONE event flag group! */
OSFlagFreeList->OSFlagType = OS_EVENT_TYPE_UNUSED;
OSFlagFreeList->OSFlagWaitList = (void *)0;
OSFlagFreeList->OSFlagFlags = (OS_FLAGS)0;
#if OS_FLAG_NAME_SIZE > 0
(void)strcpy(OSFlagFreeList->OSFlagName, "?");
#endif
#endif
#if OS_MAX_FLAGS >= 2
INT8U i;
OS_FLAG_GRP *pgrp1;
OS_FLAG_GRP *pgrp2;
(void)memset(&OSFlagTbl[0], 0, sizeof(OSFlagTbl)); /* Clear the flag group table */
pgrp1 = &OSFlagTbl[0];
pgrp2 = &OSFlagTbl[1];
for (i = 0; i < (OS_MAX_FLAGS - 1); i++) { /* Init. list of free EVENT FLAGS */
pgrp1->OSFlagType = OS_EVENT_TYPE_UNUSED;
pgrp1->OSFlagWaitList = (void *)pgrp2;
#if OS_FLAG_NAME_SIZE > 0
(void)strcpy(pgrp1->OSFlagName, "?"); /* Unknown name */
C51 COMPILER V8.05a OS_FLAG 04/11/2007 16:19:49 PAGE 17
#endif
pgrp1++;
pgrp2++;
}
pgrp1->OSFlagType = OS_EVENT_TYPE_UNUSED;
pgrp1->OSFlagWaitList = (void *)0;
#if OS_FLAG_NAME_SIZE > 0
(void)strcpy(pgrp1->OSFlagName, "?");
#endif
OSFlagFreeList = (OS_FLAG_GRP *)&OSFlagTbl[0];
#endif
}
/*$PAGE*/
/*
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