os_mem.c

ucosii 实例

        *perr = OS_ERR_MEM_INVALID_PMEM;
        return (0u);
    }
    if (pname == (INT8U **)0) {                  /* Is 'pname' a NULL pointer?                         */
        *perr = OS_ERR_PNAME_NULL;
        return (0u);
    }
#endif
    if (OSIntNesting > 0u) {                     /* See if trying to call from an ISR                  */
        *perr = OS_ERR_NAME_GET_ISR;
        return (0u);
    }
    OS_ENTER_CRITICAL();
    *pname = pmem->OSMemName;
    len    = OS_StrLen(*pname);
    OS_EXIT_CRITICAL();
    *perr  = OS_ERR_NONE;
    return (len);
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                 ASSIGN A NAME TO A MEMORY PARTITION
*
* Description: This function assigns a name to a memory partition.
*
* Arguments  : pmem      is a pointer to the memory partition
*
*              pname     is a pointer to an ASCII string that contains the name of the memory partition.
*
*              perr      is a pointer to an error code that can contain one of the following values:
*
*                        OS_ERR_NONE                if the name was copied to 'pname'
*                        OS_ERR_MEM_INVALID_PMEM    if you passed a NULL pointer for 'pmem'
*                        OS_ERR_PNAME_NULL          You passed a NULL pointer for 'pname'
*                        OS_ERR_MEM_NAME_TOO_LONG   if the name doesn't fit in the storage area
*                        OS_ERR_NAME_SET_ISR        if you called this function from an ISR
*
* Returns    : None
*********************************************************************************************************
*/

#if OS_MEM_NAME_EN > 0u
void  OSMemNameSet (OS_MEM  *pmem,
                    INT8U   *pname,
                    INT8U   *perr)
{
#if OS_CRITICAL_METHOD == 3u                     /* Allocate storage for CPU status register           */
    OS_CPU_SR  cpu_sr = 0u;
#endif



#ifdef OS_SAFETY_CRITICAL
    if (perr == (INT8U *)0) {
        OS_SAFETY_CRITICAL_EXCEPTION();
    }
#endif

#if OS_ARG_CHK_EN > 0u
    if (pmem == (OS_MEM *)0) {                   /* Is 'pmem' a NULL pointer?                          */
        *perr = OS_ERR_MEM_INVALID_PMEM;
        return;
    }
    if (pname == (INT8U *)0) {                   /* Is 'pname' a NULL pointer?                         */
        *perr = OS_ERR_PNAME_NULL;
        return;
    }
#endif
    if (OSIntNesting > 0u) {                     /* See if trying to call from an ISR                  */
        *perr = OS_ERR_NAME_SET_ISR;
        return;
    }
    OS_ENTER_CRITICAL();
    pmem->OSMemName = pname;
    OS_EXIT_CRITICAL();
    *perr           = OS_ERR_NONE;
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                         RELEASE A MEMORY BLOCK
*
* Description : Returns a memory block to a partition
*
* Arguments   : pmem    is a pointer to the memory partition control block
*
*               pblk    is a pointer to the memory block being released.
*
* Returns     : OS_ERR_NONE              if the memory block was inserted into the partition
*               OS_ERR_MEM_FULL          if you are returning a memory block to an already FULL memory
*                                        partition (You freed more blocks than you allocated!)
*               OS_ERR_MEM_INVALID_PMEM  if you passed a NULL pointer for 'pmem'
*               OS_ERR_MEM_INVALID_PBLK  if you passed a NULL pointer for the block to release.
*********************************************************************************************************
*/

INT8U  OSMemPut (OS_MEM  *pmem,
                 void    *pblk)
{
#if OS_CRITICAL_METHOD == 3u                     /* Allocate storage for CPU status register           */
    OS_CPU_SR  cpu_sr = 0u;
#endif



#if OS_ARG_CHK_EN > 0u
    if (pmem == (OS_MEM *)0) {                   /* Must point to a valid memory partition             */
        return (OS_ERR_MEM_INVALID_PMEM);
    }
    if (pblk == (void *)0) {                     /* Must release a valid block                         */
        return (OS_ERR_MEM_INVALID_PBLK);
    }
#endif
    OS_ENTER_CRITICAL();
    if (pmem->OSMemNFree >= pmem->OSMemNBlks) {  /* Make sure all blocks not already returned          */
        OS_EXIT_CRITICAL();
        return (OS_ERR_MEM_FULL);
    }
    *(void **)pblk      = pmem->OSMemFreeList;   /* Insert released block into free block list         */
    pmem->OSMemFreeList = pblk;
    pmem->OSMemNFree++;                          /* One more memory block in this partition            */
    OS_EXIT_CRITICAL();
    return (OS_ERR_NONE);                        /* Notify caller that memory block was released       */
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                          QUERY MEMORY PARTITION
*
* Description : This function is used to determine the number of free memory blocks and the number of
*               used memory blocks from a memory partition.
*
* Arguments   : pmem        is a pointer to the memory partition control block
*
*               p_mem_data  is a pointer to a structure that will contain information about the memory
*                           partition.
*
* Returns     : OS_ERR_NONE               if no errors were found.
*               OS_ERR_MEM_INVALID_PMEM   if you passed a NULL pointer for 'pmem'
*               OS_ERR_MEM_INVALID_PDATA  if you passed a NULL pointer to the data recipient.
*********************************************************************************************************
*/

#if OS_MEM_QUERY_EN > 0u
INT8U  OSMemQuery (OS_MEM       *pmem,
                   OS_MEM_DATA  *p_mem_data)
{
#if OS_CRITICAL_METHOD == 3u                     /* Allocate storage for CPU status register           */
    OS_CPU_SR  cpu_sr = 0u;
#endif



#if OS_ARG_CHK_EN > 0u
    if (pmem == (OS_MEM *)0) {                   /* Must point to a valid memory partition             */
        return (OS_ERR_MEM_INVALID_PMEM);
    }
    if (p_mem_data == (OS_MEM_DATA *)0) {        /* Must release a valid storage area for the data     */
        return (OS_ERR_MEM_INVALID_PDATA);
    }
#endif
    OS_ENTER_CRITICAL();
    p_mem_data->OSAddr     = pmem->OSMemAddr;
    p_mem_data->OSFreeList = pmem->OSMemFreeList;
    p_mem_data->OSBlkSize  = pmem->OSMemBlkSize;
    p_mem_data->OSNBlks    = pmem->OSMemNBlks;
    p_mem_data->OSNFree    = pmem->OSMemNFree;
    OS_EXIT_CRITICAL();
    p_mem_data->OSNUsed    = p_mem_data->OSNBlks - p_mem_data->OSNFree;
    return (OS_ERR_NONE);
}
#endif                                           /* OS_MEM_QUERY_EN                                    */
/*$PAGE*/
/*
*********************************************************************************************************
*                                    INITIALIZE MEMORY PARTITION MANAGER
*
* Description : This function is called by uC/OS-II to initialize the memory partition manager.  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_MemInit (void)
{
#if OS_MAX_MEM_PART == 1u
    OS_MemClr((INT8U *)&OSMemTbl[0], sizeof(OSMemTbl));   /* Clear the memory partition table          */
    OSMemFreeList               = (OS_MEM *)&OSMemTbl[0]; /* Point to beginning of free list           */
#if OS_MEM_NAME_EN > 0u
    OSMemFreeList->OSMemName    = (INT8U *)"?";           /* Unknown name                              */
#endif
#endif

#if OS_MAX_MEM_PART >= 2u
    OS_MEM  *pmem;
    INT16U   i;


    OS_MemClr((INT8U *)&OSMemTbl[0], sizeof(OSMemTbl));   /* Clear the memory partition table          */
    for (i = 0u; i < (OS_MAX_MEM_PART - 1u); i++) {       /* Init. list of free memory partitions      */
        pmem                = &OSMemTbl[i];               /* Point to memory control block (MCB)       */
        pmem->OSMemFreeList = (void *)&OSMemTbl[i + 1u];  /* Chain list of free partitions             */
#if OS_MEM_NAME_EN > 0u
        pmem->OSMemName  = (INT8U *)(void *)"?";
#endif
    }
    pmem                = &OSMemTbl[i];
    pmem->OSMemFreeList = (void *)0;                      /* Initialize last node                      */
#if OS_MEM_NAME_EN > 0u
    pmem->OSMemName = (INT8U *)(void *)"?";
#endif

    OSMemFreeList   = &OSMemTbl[0];                       /* Point to beginning of free list           */
#endif
}
#endif                                                    /* OS_MEM_EN                                 */