source: S-port/trunk/Middlewares/Third_Party/FatFs/src/option/syscall.c

/*------------------------------------------------------------------------*/
/* Sample code of OS dependent controls for FatFs                         */
/* (C)ChaN, 2014                                                          */
/*   Portions COPYRIGHT 2017 STMicroelectronics                           */
/*   Portions Copyright (C) 2014, ChaN, all right reserved                */
/*------------------------------------------------------------------------*/

/**
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2017 STMicroelectronics. All rights reserved.
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                       opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
**/



#include "../ff.h"


#if _FS_REENTRANT
/*------------------------------------------------------------------------*/
/* Create a Synchronization Object                                        */
/*------------------------------------------------------------------------*/
/* This function is called in f_mount() function to create a new
/  synchronization object, such as semaphore and mutex. When a 0 is returned,
/  the f_mount() function fails with FR_INT_ERR.
*/

int ff_cre_syncobj (    /* 1:Function succeeded, 0:Could not create the sync object */
        BYTE vol,                       /* Corresponding volume (logical drive number) */
        _SYNC_t *sobj           /* Pointer to return the created sync object */
)
{

    int ret;
#if _USE_MUTEX

#if (osCMSIS < 0x20000U)
    osMutexDef(MTX);
    *sobj = osMutexCreate(osMutex(MTX));
#else
    *sobj = osMutexNew(NULL);
#endif

#else

#if (osCMSIS < 0x20000U)
    osSemaphoreDef(SEM);
    *sobj = osSemaphoreCreate(osSemaphore(SEM), 1);
#else
    *sobj = osSemaphoreNew(1, 1, NULL);
#endif

#endif
    ret = (*sobj != NULL);

    return ret;
}



/*------------------------------------------------------------------------*/
/* Delete a Synchronization Object                                        */
/*------------------------------------------------------------------------*/
/* This function is called in f_mount() function to delete a synchronization
/  object that created with ff_cre_syncobj() function. When a 0 is returned,
/  the f_mount() function fails with FR_INT_ERR.
*/

int ff_del_syncobj (    /* 1:Function succeeded, 0:Could not delete due to any error */
        _SYNC_t sobj            /* Sync object tied to the logical drive to be deleted */
)
{
#if _USE_MUTEX
    osMutexDelete (sobj);
#else
    osSemaphoreDelete (sobj);
#endif
    return 1;
}



/*------------------------------------------------------------------------*/
/* Request Grant to Access the Volume                                     */
/*------------------------------------------------------------------------*/
/* This function is called on entering file functions to lock the volume.
/  When a 0 is returned, the file function fails with FR_TIMEOUT.
*/

int ff_req_grant (      /* 1:Got a grant to access the volume, 0:Could not get a grant */
        _SYNC_t sobj    /* Sync object to wait */
)
{
  int ret = 0;
#if (osCMSIS < 0x20000U)

#if _USE_MUTEX
  if(osMutexWait(sobj, _FS_TIMEOUT) == osOK)
#else
  if(osSemaphoreWait(sobj, _FS_TIMEOUT) == osOK)
#endif

#else

#if _USE_MUTEX
   if(osMutexAcquire(sobj, _FS_TIMEOUT) == osOK)
#else
   if(osSemaphoreAcquire(sobj, _FS_TIMEOUT) == osOK)
#endif

#endif
  {
    ret = 1;
  }

  return ret;
}



/*------------------------------------------------------------------------*/
/* Release Grant to Access the Volume                                     */
/*------------------------------------------------------------------------*/
/* This function is called on leaving file functions to unlock the volume.
*/

void ff_rel_grant (
        _SYNC_t sobj    /* Sync object to be signaled */
)
{
#if _USE_MUTEX
  osMutexRelease(sobj);
#else
  osSemaphoreRelease(sobj);
#endif
}

#endif




#if _USE_LFN == 3       /* LFN with a working buffer on the heap */
/*------------------------------------------------------------------------*/
/* Allocate a memory block                                                */
/*------------------------------------------------------------------------*/
/* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
*/

void* ff_memalloc (     /* Returns pointer to the allocated memory block */
        UINT msize              /* Number of bytes to allocate */
)
{
        return ff_malloc(msize);        /* Allocate a new memory block with POSIX API */
}


/*------------------------------------------------------------------------*/
/* Free a memory block                                                    */
/*------------------------------------------------------------------------*/

void ff_memfree (
        void* mblock    /* Pointer to the memory block to free */
)
{
        ff_free(mblock);        /* Discard the memory block with POSIX API */
}

#endif