120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*------------------------------------------------------------------------*/
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/* Sample code of OS dependent controls for FatFs */
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/* (C)ChaN, 2014 */
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/*------------------------------------------------------------------------*/
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#include <stdlib.h> /* ANSI memory controls */
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#include "../ff.h"
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#if _FS_REENTRANT
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/*-----------------------------------------------------------------------
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Create a Synchronization Object
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------------------------------------------------------------------------
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This function is called in f_mount function to create a new
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synchronization object, such as semaphore and mutex. When a zero is
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returned, the f_mount function fails with FR_INT_ERR.
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*/
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int ff_cre_syncobj ( /* TRUE:Function succeeded, FALSE:Could not create due to any error */
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BYTE vol, /* Corresponding logical drive being processed */
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_SYNC_t *sobj /* Pointer to return the created sync object */
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)
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{
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int ret;
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osSemaphoreDef(SEM);
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*sobj = osSemaphoreCreate(osSemaphore(SEM), 1);
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ret = (*sobj != NULL);
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Delete a Synchronization Object */
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount function to delete a synchronization
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/ object that created with ff_cre_syncobj function. When a zero is
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/ returned, the f_mount function fails with FR_INT_ERR.
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*/
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int ff_del_syncobj ( /* TRUE:Function succeeded, FALSE:Could not delete due to any error */
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_SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
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)
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{
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osSemaphoreDelete (sobj);
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return 1;
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}
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/*------------------------------------------------------------------------*/
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/* Request Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on entering file functions to lock the volume.
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/ When a zero is returned, the file function fails with FR_TIMEOUT.
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*/
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int ff_req_grant ( /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */
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_SYNC_t sobj /* Sync object to wait */
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)
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{
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int ret = 0;
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if(osSemaphoreWait(sobj, _FS_TIMEOUT) == osOK)
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{
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ret = 1;
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}
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Release Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on leaving file functions to unlock the volume.
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*/
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void ff_rel_grant (
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_SYNC_t sobj /* Sync object to be signaled */
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)
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{
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osSemaphoreRelease(sobj);
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}
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#endif
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#if _USE_LFN == 3 /* LFN with a working buffer on the heap */
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/*------------------------------------------------------------------------*/
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/* Allocate a memory block */
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/*------------------------------------------------------------------------*/
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/* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
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*/
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void* ff_memalloc ( /* Returns pointer to the allocated memory block */
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UINT msize /* Number of bytes to allocate */
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)
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{
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return malloc(msize); /* Allocate a new memory block with POSIX API */
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}
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/*------------------------------------------------------------------------*/
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/* Free a memory block */
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/*------------------------------------------------------------------------*/
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void ff_memfree (
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void* mblock /* Pointer to the memory block to free */
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)
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{
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free(mblock); /* Discard the memory block with POSIX API */
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}
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#endif
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