📄 os_flag.lst
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C51 COMPILER V8.02 OS_FLAG 06/22/2006 11:44:36 PAGE 1
C51 COMPILER V8.02, COMPILATION OF MODULE OS_FLAG
OBJECT MODULE PLACED IN .\obj\OS_FLAG.obj
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE uCosii\OS_FLAG.C LARGE BROWSE DEBUG OBJECTEXTEND PRINT(.\lst\OS_FLAG.lst) O
-BJECT(.\obj\OS_FLAG.obj)
line level source
1 /*
2 *********************************************************************************************************
3 * uC/OS-II
4 * The Real-Time Kernel
5 * EVENT FLAG MANAGEMENT
6 *
7 * (c) Copyright 2001, Jean J. Labrosse, Weston, FL
8 * All Rights Reserved
9 *
10 * File : OS_FLAG.C
11 * By : Jean J. Labrosse
12 *********************************************************************************************************
13 */
14
15 #ifndef OS_MASTER_FILE
16 #include "source\includes.h"
17 #endif
18
19 #if (OS_VERSION >= 251) && (OS_FLAG_EN > 0) && (OS_MAX_FLAGS > 0)
/*
*********************************************************************************************************
* LOCAL PROTOTYPES
*********************************************************************************************************
*/
static void OS_FlagBlock(OS_FLAG_GRP *pgrp, OS_FLAG_NODE *pnode, OS_FLAGS flags, INT8U wait_type, INT
-16U timeout) reentrant;
static BOOLEAN OS_FlagTaskRdy(OS_FLAG_NODE *pnode, OS_FLAGS flags_rdy) reentrant;
/*$PAGE*/
/*
*********************************************************************************************************
* CHECK THE STATUS OF FLAGS IN AN EVENT FLAG GROUP
*
* Description: This function is called to check the status of a combination of bits to be set or cleared
* in an event flag group. Your application can check for ANY bit to be set/cleared or ALL
* bits to be set/cleared.
*
* This call does not block if the desired flags are not present.
*
* Arguments : pgrp is a pointer to the desired event flag group.
*
* 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 'flags' to be clear (0)
* OS_FLAG_WAIT_CLR_ANY You will check ANY bit in 'flags' to be clear (0)
* OS_FLAG_WAIT_SET_ALL You will check ALL bits in 'flags' to be set (1)
C51 COMPILER V8.02 OS_FLAG 06/22/2006 11:44:36 PAGE 2
* OS_FLAG_WAIT_SET_ANY You will check ANY bit in 'flags' to be set (1)
*
* NOTE: Add OS_FLAG_CONSUME if you want the event flag to be 'consumed' by
* the call. Example, to wait for any flag in a group AND then clear
* the flags that are present, set 'wait_type' to:
*
* OS_FLAG_WAIT_SET_ANY + OS_FLAG_CONSUME
*
* err is a pointer to an error code and can be:
* OS_NO_ERR No error
* OS_ERR_EVENT_TYPE You are not pointing to an event flag group
* OS_FLAG_ERR_WAIT_TYPE You didn't specify a proper 'wait_type' argument.
* OS_FLAG_INVALID_PGRP You passed a NULL pointer instead of the event flag
* group handle.
* OS_FLAG_ERR_NOT_RDY The desired flags you are waiting for are not
* available.
*
* Returns : The state of the flags in the event flag group.
*
* Called from: Task or ISR
*********************************************************************************************************
*/
#if OS_FLAG_ACCEPT_EN > 0
OS_FLAGS OSFlagAccept (OS_FLAG_GRP *pgrp, OS_FLAGS flags, INT8U wait_type, INT8U *err) reentrant
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
OS_FLAGS flags_cur;
OS_FLAGS flags_rdy;
BOOLEAN consume;
#if OS_ARG_CHK_EN > 0
if (pgrp == (OS_FLAG_GRP *)0) { /* Validate 'pgrp' */
*err = OS_FLAG_INVALID_PGRP;
return ((OS_FLAGS)0);
}
if (pgrp->OSFlagType != OS_EVENT_TYPE_FLAG) { /* Validate event block type */
*err = OS_ERR_EVENT_TYPE;
return ((OS_FLAGS)0);
}
#endif
if (wait_type & OS_FLAG_CONSUME) { /* See if we need to consume the flags */
wait_type &= ~OS_FLAG_CONSUME;
consume = TRUE;
} else {
consume = FALSE;
}
/*$PAGE*/
*err = OS_NO_ERR; /* Assume NO error until proven otherwise. */
OS_ENTER_CRITICAL();
switch (wait_type) {
case OS_FLAG_WAIT_SET_ALL: /* See if all required flags are set */
flags_rdy = pgrp->OSFlagFlags & flags; /* Extract only the bits we want */
if (flags_rdy == flags) { /* Must match ALL the bits that we want */
if (consume == TRUE) { /* See if we need to consume the flags */
pgrp->OSFlagFlags &= ~flags_rdy; /* Clear ONLY the flags that we wanted */
}
} else {
*err = OS_FLAG_ERR_NOT_RDY;
C51 COMPILER V8.02 OS_FLAG 06/22/2006 11:44:36 PAGE 3
}
flags_cur = pgrp->OSFlagFlags; /* Will return the state of the group */
OS_EXIT_CRITICAL();
break;
case OS_FLAG_WAIT_SET_ANY:
flags_rdy = pgrp->OSFlagFlags & flags; /* Extract only the bits we want */
if (flags_rdy != (OS_FLAGS)0) { /* See if any flag set */
if (consume == TRUE) { /* See if we need to consume the flags */
pgrp->OSFlagFlags &= ~flags_rdy; /* Clear ONLY the flags that we got */
}
} else {
*err = OS_FLAG_ERR_NOT_RDY;
}
flags_cur = pgrp->OSFlagFlags; /* Will return the state of the group */
OS_EXIT_CRITICAL();
break;
#if OS_FLAG_WAIT_CLR_EN > 0
case OS_FLAG_WAIT_CLR_ALL: /* See if all required flags are cleared */
flags_rdy = ~pgrp->OSFlagFlags & flags; /* Extract only the bits we want */
if (flags_rdy == flags) { /* Must match ALL the bits that we want */
if (consume == TRUE) { /* See if we need to consume the flags */
pgrp->OSFlagFlags |= flags_rdy; /* Set ONLY the flags that we wanted */
}
} else {
*err = OS_FLAG_ERR_NOT_RDY;
}
flags_cur = pgrp->OSFlagFlags; /* Will return the state of the group */
OS_EXIT_CRITICAL();
break;
case OS_FLAG_WAIT_CLR_ANY:
flags_rdy = ~pgrp->OSFlagFlags & flags; /* Extract only the bits we want */
if (flags_rdy != (OS_FLAGS)0) { /* See if any flag cleared */
if (consume == TRUE) { /* See if we need to consume the flags */
pgrp->OSFlagFlags |= flags_rdy; /* Set ONLY the flags that we got */
}
} else {
*err = OS_FLAG_ERR_NOT_RDY;
}
flags_cur = pgrp->OSFlagFlags; /* Will return the state of the group */
OS_EXIT_CRITICAL();
break;
#endif
default:
OS_EXIT_CRITICAL();
flags_cur = (OS_FLAGS)0;
*err = OS_FLAG_ERR_WAIT_TYPE;
break;
}
return (flags_cur);
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* CREATE AN EVENT FLAG
*
* Description: This function is called to create an event flag group.
C51 COMPILER V8.02 OS_FLAG 06/22/2006 11:44:36 PAGE 4
*
* Arguments : flags Contains the initial value to store in the event flag group.
*
* err is a pointer to an error code which will be returned to your application:
* OS_NO_ERR if the call was successful.
* OS_ERR_CREATE_ISR if you attempted to create an Event Flag from an
* ISR.
* OS_FLAG_GRP_DEPLETED if there are no more event flag groups
*
* Returns : A pointer to an event flag group or a NULL pointer if no more groups are available.
*
* Called from: Task ONLY
*********************************************************************************************************
*/
OS_FLAG_GRP *OSFlagCreate (OS_FLAGS flags, INT8U *err) reentrant
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
OS_FLAG_GRP *pgrp;
if (OSIntNesting > 0) { /* See if called from ISR ... */
*err = OS_ERR_CREATE_ISR; /* ... can't CREATE from an ISR */
return ((OS_FLAG_GRP *)0);
}
OS_ENTER_CRITICAL();
pgrp = OSFlagFreeList; /* Get next free event flag */
if (pgrp != (OS_FLAG_GRP *)0) { /* See if we have event flag groups available */
/* Adjust free list */
OSFlagFreeList = (OS_FLAG_GRP *)OSFlagFreeList->OSFlagWaitList;
pgrp->OSFlagType = OS_EVENT_TYPE_FLAG; /* Set to event flag group type */
pgrp->OSFlagFlags = flags; /* Set to desired initial value */
pgrp->OSFlagWaitList = (void *)0; /* Clear list of tasks waiting on flags */
OS_EXIT_CRITICAL();
*err = OS_NO_ERR;
} else {
OS_EXIT_CRITICAL();
*err = OS_FLAG_GRP_DEPLETED;
}
return (pgrp); /* Return pointer to event flag group */
}
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