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112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*------------------------------------------------------------------------*/
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/* Sample code of OS dependent synchronization object controls */
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/* for FatFs R0.07d (C)ChaN, 2009 */
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/*------------------------------------------------------------------------*/
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#include <FreeRTOS.h>
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#include <semphr.h>
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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 for a Volume */
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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 FALSE is
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/ returned, the f_mount function fails with FR_INT_ERR.
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*/
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BOOL 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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BOOL ret;
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*sobj = xSemaphoreCreateMutex();
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if( *sobj == NULL )
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{
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ret = FALSE;
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}
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else
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{
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ret = TRUE;
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}
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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 FALSE is
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/ returned, the f_mount function fails with FR_INT_ERR.
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*/
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BOOL 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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BOOL ret;
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if( sobj != NULL )
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{
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vQueueDelete( sobj );
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ret = TRUE;
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}
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else
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{
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ret = FALSE;
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}
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return ret;
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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 FALSE is returned, the file function fails with FR_TIMEOUT.
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*/
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BOOL 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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BOOL ret;
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ret = xSemaphoreTake( sobj, _FS_TIMEOUT );
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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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xSemaphoreGive( sobj );
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}
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#else
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#error This file is not needed in this configuration.
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#endif
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