📄 os_q.c
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pq->OSQOut--;
pq->OSQOut->MsgID = MsgID;
pq->OSQOut->LMsgPara = LMsgPara;
pq->OSQOut->HMsgPara = HMsgPara;
pq->OSQEntries++; /* Update the nbr of entries in the queue */
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* POST MESSAGE TO A QUEUE
*
* Description: This function sends a message to a queue. This call has been added to reduce code size
* since it can replace both OSQPost() and OSQPostFront(). Also, this function adds the
* capability to broadcast a message to ALL tasks waiting on the message queue.
*
* Arguments : pevent is a pointer to the event control block associated with the desired queue
*
* msg is a pointer to the message to send. You MUST NOT send a NULL pointer.
*
* opt determines the type of POST performed:
* OS_POST_OPT_NONE POST to a single waiting task
* (Identical to OSQPost())
* OS_POST_OPT_BROADCAST POST to ALL tasks that are waiting on the queue
* OS_POST_OPT_FRONT POST as LIFO (Simulates OSQPostFront())
*
* Below is a list of ALL the possible combination of these flags:
*
* 1) OS_POST_OPT_NONE
* identical to OSQPost()
*
* 2) OS_POST_OPT_FRONT
* identical to OSQPostFront()
*
* 3) OS_POST_OPT_BROADCAST
* identical to OSQPost() but will broadcast 'msg' to ALL waiting tasks
*
* 4) OS_POST_OPT_FRONT + OS_POST_OPT_BROADCAST is identical to
* OSQPostFront() except that will broadcast 'msg' to ALL waiting tasks
*
* Returns : OS_NO_ERR The call was successful and the message was sent
* OS_Q_FULL If the queue cannot accept any more messages because it is full.
* OS_ERR_EVENT_TYPE If you didn't pass a pointer to a queue.
* OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer
* OS_ERR_POST_NULL_PTR If you are attempting to post a NULL pointer
*
* Warning : Interrupts can be disabled for a long time if you do a 'broadcast'. In fact, the
* interrupt disable time is proportional to the number of tasks waiting on the queue.
*********************************************************************************************************
*/
#if OS_Q_POST_OPT_EN > 0
INT8U OSQPostOpt (OS_EVENT *pevent, INT16U MsgID, INT32U LMsgPara, INT32U HMsgPara, INT8U opt)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
OS_Q *pq;
INT8U prio;
#if OS_ARG_CHK_EN > 0
if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
return (OS_ERR_PEVENT_NULL);
}
if (pevent->OSEventType != OS_EVENT_TYPE_Q) { /* Validate event block type */
return (OS_ERR_EVENT_TYPE);
}
#endif
OS_ENTER_CRITICAL();
if (pevent->OSEventGrp != 0x00) { /* See if any task pending on queue */
if ((opt & OS_POST_OPT_BROADCAST) != 0x00) { /* Do we need to post msg to ALL waiting tasks ? */
while (pevent->OSEventGrp != 0x00) { /* Yes, Post to ALL tasks waiting on queue */
prio = OS_EventTaskRdy(pevent, 0, OS_STAT_Q);
OSTCBPrioTbl[prio]->OSTCBQMsg.MsgID = MsgID;
OSTCBPrioTbl[prio]->OSTCBQMsg.LMsgPara = LMsgPara;
OSTCBPrioTbl[prio]->OSTCBQMsg.HMsgPara = HMsgPara;
}
} else {
prio = OS_EventTaskRdy(pevent, 0, OS_STAT_Q); /* No, Post to HPT waiting on queue */
OSTCBPrioTbl[prio]->OSTCBQMsg.MsgID = MsgID;
OSTCBPrioTbl[prio]->OSTCBQMsg.LMsgPara = LMsgPara;
OSTCBPrioTbl[prio]->OSTCBQMsg.HMsgPara = HMsgPara;
}
OS_EXIT_CRITICAL();
OS_Sched(); /* Find highest priority task ready to run */
return (OS_NO_ERR);
}
pq = (OS_Q *)pevent->OSEventPtr; /* Point to queue control block */
if (pq->OSQEntries >= pq->OSQSize) { /* Make sure queue is not full */
OS_EXIT_CRITICAL();
return (OS_Q_FULL);
}
if ((opt & OS_POST_OPT_FRONT) != 0x00) { /* Do we post to the FRONT of the queue? */
if (pq->OSQOut == pq->OSQStart) { /* Yes, Post as LIFO, Wrap OUT pointer if we ... */
pq->OSQOut = pq->OSQEnd; /* ... are at the 1st queue entry */
}
pq->OSQOut--;
pq->OSQOut->MsgID = MsgID;
pq->OSQOut->LMsgPara = LMsgPara;
pq->OSQOut->HMsgPara = HMsgPara; /* Insert message into queue */
} else { /* No, Post as FIFO */
pq->OSQIn->MsgID = MsgID;
pq->OSQIn->LMsgPara = LMsgPara;
pq->OSQIn->HMsgPara = HMsgPara;
pq->OSQIn++; /* Insert message into queue */
if (pq->OSQIn == pq->OSQEnd) { /* Wrap IN ptr if we are at end of queue */
pq->OSQIn = pq->OSQStart;
}
}
pq->OSQEntries++; /* Update the nbr of entries in the queue */
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* QUERY A MESSAGE QUEUE
*
* Description: This function obtains information about a message queue.
*
* Arguments : pevent is a pointer to the event control block associated with the desired queue
*
* pdata is a pointer to a structure that will contain information about the message
* queue.
*
* Returns : OS_NO_ERR The call was successful and the message was sent
* OS_ERR_EVENT_TYPE If you are attempting to obtain data from a non queue.
* OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer
*********************************************************************************************************
*/
#if OS_Q_QUERY_EN > 0
INT8U OSQQuery (OS_EVENT *pevent, OS_Q_DATA *pdata)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
OS_Q *pq;
INT8U *psrc;
INT8U *pdest;
#if OS_ARG_CHK_EN > 0
if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
return (OS_ERR_PEVENT_NULL);
}
if (pevent->OSEventType != OS_EVENT_TYPE_Q) { /* Validate event block type */
return (OS_ERR_EVENT_TYPE);
}
#endif
OS_ENTER_CRITICAL();
pdata->OSEventGrp = pevent->OSEventGrp; /* Copy message queue wait list */
psrc = &pevent->OSEventTbl[0];
pdest = &pdata->OSEventTbl[0];
#if OS_EVENT_TBL_SIZE > 0
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 1
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 2
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 3
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 4
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 5
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 6
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 7
*pdest = *psrc;
#endif
pq = (OS_Q *)pevent->OSEventPtr;
if (pq->OSQEntries > 0) {
pdata->OSMsg = pq->OSQOut; /* Get next message to return if available */
} else {
pdata->OSMsg = (OS_QMSG *)0;
}
pdata->OSNMsgs = pq->OSQEntries;
pdata->OSQSize = pq->OSQSize;
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
#endif /* OS_Q_QUERY_EN */
/*$PAGE*/
/*
*********************************************************************************************************
* QUEUE MODULE INITIALIZATION
*
* Description : This function is called by uC/OS-II to initialize the message queue module. Your
* application MUST NOT call this function.
*
* Arguments : none
*
* Returns : none
*
* Note(s) : This function is INTERNAL to uC/OS-II and your application should not call it.
*********************************************************************************************************
*/
void OS_QInit (void)
{
#if OS_MAX_QS == 1
OSQFreeList = &OSQTbl[0]; /* Only ONE queue! */
OSQFreeList->OSQPtr = (OS_Q *)0;
#endif
#if OS_MAX_QS >= 2
INT16U i;
OS_Q *pq1;
OS_Q *pq2;
pq1 = &OSQTbl[0];
pq2 = &OSQTbl[1];
for (i = 0; i < (OS_MAX_QS - 1); i++) { /* Init. list of free QUEUE control blocks */
pq1->OSQPtr = pq2;
pq1++;
pq2++;
}
pq1->OSQPtr = (OS_Q *)0;
OSQFreeList = &OSQTbl[0];
#endif
}
#endif /* OS_Q_EN */
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