Import fatfs R0.13b

[z180-stamp.git] / fatfs / source / ffsystem.c

/*------------------------------------------------------------------------*/\r
/* Sample Code of OS Dependent Functions for FatFs                        */\r
/* (C)ChaN, 2017                                                          */\r
/*------------------------------------------------------------------------*/\r
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#include "ff.h"\r
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#if FF_USE_LFN == 3	/* Dynamic memory allocation */\r
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/*------------------------------------------------------------------------*/\r
/* Allocate a memory block                                                */\r
/*------------------------------------------------------------------------*/\r
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void* ff_memalloc (	/* Returns pointer to the allocated memory block (null on not enough core) */\r
	UINT msize		/* Number of bytes to allocate */\r
)\r
{\r
	return malloc(msize);	/* Allocate a new memory block with POSIX API */\r
}\r
\r
\r
/*------------------------------------------------------------------------*/\r
/* Free a memory block                                                    */\r
/*------------------------------------------------------------------------*/\r
\r
void ff_memfree (\r
	void* mblock	/* Pointer to the memory block to free (nothing to do for null) */\r
)\r
{\r
	free(mblock);	/* Free the memory block with POSIX API */\r
}\r
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#endif\r
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#if FF_FS_REENTRANT	/* Mutal exclusion */\r
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/*------------------------------------------------------------------------*/\r
/* Create a Synchronization Object                                        */\r
/*------------------------------------------------------------------------*/\r
/* This function is called in f_mount() function to create a new\r
/  synchronization object for the volume, such as semaphore and mutex.\r
/  When a 0 is returned, the f_mount() function fails with FR_INT_ERR.\r
*/\r
\r
//const osMutexDef_t Mutex[FF_VOLUMES];	/* CMSIS-RTOS */\r
\r
\r
int ff_cre_syncobj (	/* 1:Function succeeded, 0:Could not create the sync object */\r
	BYTE vol,			/* Corresponding volume (logical drive number) */\r
	FF_SYNC_t* sobj		/* Pointer to return the created sync object */\r
)\r
{\r
	/* Win32 */\r
	*sobj = CreateMutex(NULL, FALSE, NULL);\r
	return (int)(*sobj != INVALID_HANDLE_VALUE);\r
\r
	/* uITRON */\r
//	T_CSEM csem = {TA_TPRI,1,1};\r
//	*sobj = acre_sem(&csem);\r
//	return (int)(*sobj > 0);\r
\r
	/* uC/OS-II */\r
//	OS_ERR err;\r
//	*sobj = OSMutexCreate(0, &err);\r
//	return (int)(err == OS_NO_ERR);\r
\r
	/* FreeRTOS */\r
//	*sobj = xSemaphoreCreateMutex();\r
//	return (int)(*sobj != NULL);\r
\r
	/* CMSIS-RTOS */\r
//	*sobj = osMutexCreate(Mutex + vol);\r
//	return (int)(*sobj != NULL);\r
}\r
\r
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/*------------------------------------------------------------------------*/\r
/* Delete a Synchronization Object                                        */\r
/*------------------------------------------------------------------------*/\r
/* This function is called in f_mount() function to delete a synchronization\r
/  object that created with ff_cre_syncobj() function. When a 0 is returned,\r
/  the f_mount() function fails with FR_INT_ERR.\r
*/\r
\r
int ff_del_syncobj (	/* 1:Function succeeded, 0:Could not delete due to an error */\r
	FF_SYNC_t sobj		/* Sync object tied to the logical drive to be deleted */\r
)\r
{\r
	/* Win32 */\r
	return (int)CloseHandle(sobj);\r
\r
	/* uITRON */\r
//	return (int)(del_sem(sobj) == E_OK);\r
\r
	/* uC/OS-II */\r
//	OS_ERR err;\r
//	OSMutexDel(sobj, OS_DEL_ALWAYS, &err);\r
//	return (int)(err == OS_NO_ERR);\r
\r
	/* FreeRTOS */\r
//  vSemaphoreDelete(sobj);\r
//	return 1;\r
\r
	/* CMSIS-RTOS */\r
//	return (int)(osMutexDelete(sobj) == osOK);\r
}\r
\r
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/*------------------------------------------------------------------------*/\r
/* Request Grant to Access the Volume                                     */\r
/*------------------------------------------------------------------------*/\r
/* This function is called on entering file functions to lock the volume.\r
/  When a 0 is returned, the file function fails with FR_TIMEOUT.\r
*/\r
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int ff_req_grant (	/* 1:Got a grant to access the volume, 0:Could not get a grant */\r
	FF_SYNC_t sobj	/* Sync object to wait */\r
)\r
{\r
	/* Win32 */\r
	return (int)(WaitForSingleObject(sobj, FF_FS_TIMEOUT) == WAIT_OBJECT_0);\r
\r
	/* uITRON */\r
//	return (int)(wai_sem(sobj) == E_OK);\r
\r
	/* uC/OS-II */\r
//	OS_ERR err;\r
//	OSMutexPend(sobj, FF_FS_TIMEOUT, &err));\r
//	return (int)(err == OS_NO_ERR);\r
\r
	/* FreeRTOS */\r
//	return (int)(xSemaphoreTake(sobj, FF_FS_TIMEOUT) == pdTRUE);\r
\r
	/* CMSIS-RTOS */\r
//	return (int)(osMutexWait(sobj, FF_FS_TIMEOUT) == osOK);\r
}\r
\r
\r
/*------------------------------------------------------------------------*/\r
/* Release Grant to Access the Volume                                     */\r
/*------------------------------------------------------------------------*/\r
/* This function is called on leaving file functions to unlock the volume.\r
*/\r
\r
void ff_rel_grant (\r
	FF_SYNC_t sobj	/* Sync object to be signaled */\r
)\r
{\r
	/* Win32 */\r
	ReleaseMutex(sobj);\r
\r
	/* uITRON */\r
//	sig_sem(sobj);\r
\r
	/* uC/OS-II */\r
//	OSMutexPost(sobj);\r
\r
	/* FreeRTOS */\r
//	xSemaphoreGive(sobj);\r
\r
	/* CMSIS-RTOS */\r
//	osMutexRelease(sobj);\r
}\r
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#endif\r
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