1  /*------------------------------------------------------------------------*/
  2  /* Sample Code of OS Dependent Functions for FatFs                        */
  3  /* (C)ChaN, 2018                                                          */
  4  /*------------------------------------------------------------------------*/
  5  
  6  
  7  #include "ff.h"
  8  
  9  
 10  #if FF_USE_LFN == 3	/* Dynamic memory allocation */
 11  
 12  /*------------------------------------------------------------------------*/
 13  /* Allocate a memory block                                                */
 14  /*------------------------------------------------------------------------*/
 15  
 16  void* ff_memalloc (	/* Returns pointer to the allocated memory block (null if not enough core) */
 17  	UINT msize		/* Number of bytes to allocate */
 18  )
 19  {
 20  	return malloc(msize);	/* Allocate a new memory block with POSIX API */
 21  }
 22  
 23  
 24  /*------------------------------------------------------------------------*/
 25  /* Free a memory block                                                    */
 26  /*------------------------------------------------------------------------*/
 27  
 28  void ff_memfree (
 29  	void* mblock	/* Pointer to the memory block to free (nothing to do if null) */
 30  )
 31  {
 32  	free(mblock);	/* Free the memory block with POSIX API */
 33  }
 34  
 35  #endif
 36  
 37  
 38  
 39  #if FF_FS_REENTRANT	/* Mutal exclusion */
 40  
 41  /*------------------------------------------------------------------------*/
 42  /* Create a Synchronization Object                                        */
 43  /*------------------------------------------------------------------------*/
 44  /* This function is called in f_mount() function to create a new
 45  /  synchronization object for the volume, such as semaphore and mutex.
 46  /  When a 0 is returned, the f_mount() function fails with FR_INT_ERR.
 47  */
 48  
 49  //const osMutexDef_t Mutex[FF_VOLUMES];	/* Table of CMSIS-RTOS mutex */
 50  
 51  
 52  int ff_cre_syncobj (	/* 1:Function succeeded, 0:Could not create the sync object */
 53  	BYTE vol,			/* Corresponding volume (logical drive number) */
 54  	FF_SYNC_t* sobj		/* Pointer to return the created sync object */
 55  )
 56  {
 57  	/* Win32 */
 58  	*sobj = CreateMutex(NULL, FALSE, NULL);
 59  	return (int)(*sobj != INVALID_HANDLE_VALUE);
 60  
 61  	/* uITRON */
 62  //	T_CSEM csem = {TA_TPRI,1,1};
 63  //	*sobj = acre_sem(&csem);
 64  //	return (int)(*sobj > 0);
 65  
 66  	/* uC/OS-II */
 67  //	OS_ERR err;
 68  //	*sobj = OSMutexCreate(0, &err);
 69  //	return (int)(err == OS_NO_ERR);
 70  
 71  	/* FreeRTOS */
 72  //	*sobj = xSemaphoreCreateMutex();
 73  //	return (int)(*sobj != NULL);
 74  
 75  	/* CMSIS-RTOS */
 76  //	*sobj = osMutexCreate(&Mutex[vol]);
 77  //	return (int)(*sobj != NULL);
 78  }
 79  
 80  
 81  /*------------------------------------------------------------------------*/
 82  /* Delete a Synchronization Object                                        */
 83  /*------------------------------------------------------------------------*/
 84  /* This function is called in f_mount() function to delete a synchronization
 85  /  object that created with ff_cre_syncobj() function. When a 0 is returned,
 86  /  the f_mount() function fails with FR_INT_ERR.
 87  */
 88  
 89  int ff_del_syncobj (	/* 1:Function succeeded, 0:Could not delete due to an error */
 90  	FF_SYNC_t sobj		/* Sync object tied to the logical drive to be deleted */
 91  )
 92  {
 93  	/* Win32 */
 94  	return (int)CloseHandle(sobj);
 95  
 96  	/* uITRON */
 97  //	return (int)(del_sem(sobj) == E_OK);
 98  
 99  	/* uC/OS-II */
100  //	OS_ERR err;
101  //	OSMutexDel(sobj, OS_DEL_ALWAYS, &err);
102  //	return (int)(err == OS_NO_ERR);
103  
104  	/* FreeRTOS */
105  //  vSemaphoreDelete(sobj);
106  //	return 1;
107  
108  	/* CMSIS-RTOS */
109  //	return (int)(osMutexDelete(sobj) == osOK);
110  }
111  
112  
113  /*------------------------------------------------------------------------*/
114  /* Request Grant to Access the Volume                                     */
115  /*------------------------------------------------------------------------*/
116  /* This function is called on entering file functions to lock the volume.
117  /  When a 0 is returned, the file function fails with FR_TIMEOUT.
118  */
119  
120  int ff_req_grant (	/* 1:Got a grant to access the volume, 0:Could not get a grant */
121  	FF_SYNC_t sobj	/* Sync object to wait */
122  )
123  {
124  	/* Win32 */
125  	return (int)(WaitForSingleObject(sobj, FF_FS_TIMEOUT) == WAIT_OBJECT_0);
126  
127  	/* uITRON */
128  //	return (int)(wai_sem(sobj) == E_OK);
129  
130  	/* uC/OS-II */
131  //	OS_ERR err;
132  //	OSMutexPend(sobj, FF_FS_TIMEOUT, &err));
133  //	return (int)(err == OS_NO_ERR);
134  
135  	/* FreeRTOS */
136  //	return (int)(xSemaphoreTake(sobj, FF_FS_TIMEOUT) == pdTRUE);
137  
138  	/* CMSIS-RTOS */
139  //	return (int)(osMutexWait(sobj, FF_FS_TIMEOUT) == osOK);
140  }
141  
142  
143  /*------------------------------------------------------------------------*/
144  /* Release Grant to Access the Volume                                     */
145  /*------------------------------------------------------------------------*/
146  /* This function is called on leaving file functions to unlock the volume.
147  */
148  
149  void ff_rel_grant (
150  	FF_SYNC_t sobj	/* Sync object to be signaled */
151  )
152  {
153  	/* Win32 */
154  	ReleaseMutex(sobj);
155  
156  	/* uITRON */
157  //	sig_sem(sobj);
158  
159  	/* uC/OS-II */
160  //	OSMutexPost(sobj);
161  
162  	/* FreeRTOS */
163  //	xSemaphoreGive(sobj);
164  
165  	/* CMSIS-RTOS */
166  //	osMutexRelease(sobj);
167  }
168  
169  #endif
170