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	FatFS is an open source filesystem library supporting FAT12, FAT16, FAT32, and exFAT. The source is available at http://elm-chan.org/fsw/ff/00index_e.html Signed-off-by: Eric Callahan <arksine.code@gmail.com>
		
			
				
	
	
		
			171 lines
		
	
	
		
			4.9 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			171 lines
		
	
	
		
			4.9 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
| /*------------------------------------------------------------------------*/
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| /* Sample Code of OS Dependent Functions for FatFs                        */
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| /* (C)ChaN, 2018                                                          */
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| /*------------------------------------------------------------------------*/
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| 
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| 
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| #include "ff.h"
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| 
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| 
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| #if FF_USE_LFN == 3	/* Dynamic memory allocation */
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| 
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| /*------------------------------------------------------------------------*/
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| /* Allocate a memory block                                                */
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| /*------------------------------------------------------------------------*/
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| 
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| void* ff_memalloc (	/* Returns pointer to the allocated memory block (null if 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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| 
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| /*------------------------------------------------------------------------*/
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| /* Free a memory block                                                    */
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| /*------------------------------------------------------------------------*/
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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 if 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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| 
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| #endif
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| 
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| 
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| 
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| #if FF_FS_REENTRANT	/* Mutal exclusion */
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| 
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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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| 
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| //const osMutexDef_t Mutex[FF_VOLUMES];	/* Table of CMSIS-RTOS mutex */
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| 
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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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|     /* Win32 */
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|     *sobj = CreateMutex(NULL, FALSE, NULL);
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|     return (int)(*sobj != INVALID_HANDLE_VALUE);
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| 
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|     /* uITRON */
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| //	T_CSEM csem = {TA_TPRI,1,1};
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| //	*sobj = acre_sem(&csem);
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| //	return (int)(*sobj > 0);
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| 
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|     /* uC/OS-II */
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| //	OS_ERR err;
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| //	*sobj = OSMutexCreate(0, &err);
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| //	return (int)(err == OS_NO_ERR);
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| 
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|     /* FreeRTOS */
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| //	*sobj = xSemaphoreCreateMutex();
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| //	return (int)(*sobj != NULL);
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| 
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|     /* CMSIS-RTOS */
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| //	*sobj = osMutexCreate(&Mutex[vol]);
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| //	return (int)(*sobj != NULL);
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| }
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| 
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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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| 
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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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|     /* Win32 */
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|     return (int)CloseHandle(sobj);
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| 
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|     /* uITRON */
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| //	return (int)(del_sem(sobj) == E_OK);
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| 
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|     /* uC/OS-II */
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| //	OS_ERR err;
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| //	OSMutexDel(sobj, OS_DEL_ALWAYS, &err);
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| //	return (int)(err == OS_NO_ERR);
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| 
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|     /* FreeRTOS */
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| //  vSemaphoreDelete(sobj);
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| //	return 1;
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| 
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|     /* CMSIS-RTOS */
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| //	return (int)(osMutexDelete(sobj) == osOK);
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| }
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| 
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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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| 
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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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|     /* Win32 */
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|     return (int)(WaitForSingleObject(sobj, FF_FS_TIMEOUT) == WAIT_OBJECT_0);
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| 
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|     /* uITRON */
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| //	return (int)(wai_sem(sobj) == E_OK);
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| 
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|     /* uC/OS-II */
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| //	OS_ERR err;
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| //	OSMutexPend(sobj, FF_FS_TIMEOUT, &err));
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| //	return (int)(err == OS_NO_ERR);
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| 
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|     /* FreeRTOS */
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| //	return (int)(xSemaphoreTake(sobj, FF_FS_TIMEOUT) == pdTRUE);
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| 
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|     /* CMSIS-RTOS */
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| //	return (int)(osMutexWait(sobj, FF_FS_TIMEOUT) == osOK);
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| }
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| 
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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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| 
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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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|     /* Win32 */
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|     ReleaseMutex(sobj);
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| 
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|     /* uITRON */
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| //	sig_sem(sobj);
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| 
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|     /* uC/OS-II */
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| //	OSMutexPost(sobj);
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| 
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|     /* FreeRTOS */
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| //	xSemaphoreGive(sobj);
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| 
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|     /* CMSIS-RTOS */
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| //	osMutexRelease(sobj);
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| }
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| 
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| #endif
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| 
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