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107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/*------------------------------------------------------------------------*/
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/* Sample Code of OS Dependent Functions for FatFs */
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/* (C)ChaN, 2017 */
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/*------------------------------------------------------------------------*/
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#include "ff.h"
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#if FF_USE_LFN == 3 /* Dynamic memory allocation */
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/*------------------------------------------------------------------------*/
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/* Allocate a memory block */
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/*------------------------------------------------------------------------*/
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void* ff_memalloc ( /* Returns pointer to the allocated memory block (null on not enough core) */
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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 (nothing to do for null) */
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)
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{
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free(mblock); /* Free the memory block with POSIX API */
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}
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#endif
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#if FF_FS_REENTRANT /* Mutal exclusion */
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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 for the volume, such as semaphore and mutex.
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/ When a 0 is returned, the f_mount() function fails with FR_INT_ERR.
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*/
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int ff_cre_syncobj ( /* 1:Function succeeded, 0:Could not create the sync object */
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BYTE vol, /* Corresponding volume (logical drive number) */
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FF_SYNC_t *sobj /* Pointer to return the created sync object */
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)
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{
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*sobj = xSemaphoreCreateMutex();
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return (*sobj != NULL) ? 1 : 0;
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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 0 is returned,
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/ the f_mount() function fails with FR_INT_ERR.
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*/
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int ff_del_syncobj ( /* 1:Function succeeded, 0:Could not delete due to an error */
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FF_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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vSemaphoreDelete(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 0 is returned, the file function fails with FR_TIMEOUT.
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*/
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int ff_req_grant ( /* 1:Got a grant to access the volume, 0:Could not get a grant */
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FF_SYNC_t sobj /* Sync object to wait */
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)
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{
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return (xSemaphoreTake(sobj, FF_FS_TIMEOUT) == pdTRUE) ? 1 : 0;
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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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FF_SYNC_t sobj /* Sync object to be signaled */
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)
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{
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xSemaphoreGive(sobj);
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}
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#endif
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