unleashed-firmware/firmware/targets/f4/Src/fatfs/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 "fatfs/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;

    //osSemaphoreDef(SEM);
    //*sobj = osSemaphoreCreate(osSemaphore(SEM), 1);
    *sobj = osMutexNew(NULL);
    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 */
)
{
    osMutexDelete(sobj);
    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(osMutexAcquire(sobj, _FS_TIMEOUT) == osOK) {
      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 */
)
{
    osMutexRelease(sobj);
}

#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