1 /*------------------------------------------------------------------------*/
2 /* Sample code of OS dependent controls for FatFs */
3 /* (C)ChaN, 2014 */
4 /*------------------------------------------------------------------------*/
5
6
7 #include "../ff.h"
8
9
10 #if _FS_REENTRANT
11 /*------------------------------------------------------------------------*/
12 /* Create a Synchronization Object
13 /*------------------------------------------------------------------------*/
14 /* This function is called in f_mount() function to create a new
15 / synchronization object, such as semaphore and mutex. When a 0 is returned,
16 / the f_mount() function fails with FR_INT_ERR.
17 */
18
ff_cre_syncobj(BYTE vol,_SYNC_t * sobj)19 int ff_cre_syncobj ( /* 1:Function succeeded, 0:Could not create the sync object */
20 BYTE vol, /* Corresponding volume (logical drive number) */
21 _SYNC_t *sobj /* Pointer to return the created sync object */
22 )
23 {
24 int ret;
25
26
27 *sobj = CreateMutex(NULL, FALSE, NULL); /* Win32 */
28 ret = (int)(*sobj != INVALID_HANDLE_VALUE);
29
30 // *sobj = SyncObjects[vol]; /* uITRON (give a static sync object) */
31 // ret = 1; /* The initial value of the semaphore must be 1. */
32
33 // *sobj = OSMutexCreate(0, &err); /* uC/OS-II */
34 // ret = (int)(err == OS_NO_ERR);
35
36 // *sobj = xSemaphoreCreateMutex(); /* FreeRTOS */
37 // ret = (int)(*sobj != NULL);
38
39 return ret;
40 }
41
42
43
44 /*------------------------------------------------------------------------*/
45 /* Delete a Synchronization Object */
46 /*------------------------------------------------------------------------*/
47 /* This function is called in f_mount() function to delete a synchronization
48 / object that created with ff_cre_syncobj() function. When a 0 is returned,
49 / the f_mount() function fails with FR_INT_ERR.
50 */
51
ff_del_syncobj(_SYNC_t sobj)52 int ff_del_syncobj ( /* 1:Function succeeded, 0:Could not delete due to any error */
53 _SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
54 )
55 {
56 int ret;
57
58
59 ret = CloseHandle(sobj); /* Win32 */
60
61 // ret = 1; /* uITRON (nothing to do) */
62
63 // OSMutexDel(sobj, OS_DEL_ALWAYS, &err); /* uC/OS-II */
64 // ret = (int)(err == OS_NO_ERR);
65
66 // vSemaphoreDelete(sobj); /* FreeRTOS */
67 // ret = 1;
68
69 return ret;
70 }
71
72
73
74 /*------------------------------------------------------------------------*/
75 /* Request Grant to Access the Volume */
76 /*------------------------------------------------------------------------*/
77 /* This function is called on entering file functions to lock the volume.
78 / When a 0 is returned, the file function fails with FR_TIMEOUT.
79 */
80
ff_req_grant(_SYNC_t sobj)81 int ff_req_grant ( /* 1:Got a grant to access the volume, 0:Could not get a grant */
82 _SYNC_t sobj /* Sync object to wait */
83 )
84 {
85 int ret;
86
87 ret = (int)(WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0); /* Win32 */
88
89 // ret = (int)(wai_sem(sobj) == E_OK); /* uITRON */
90
91 // OSMutexPend(sobj, _FS_TIMEOUT, &err)); /* uC/OS-II */
92 // ret = (int)(err == OS_NO_ERR);
93
94 // ret = (int)(xSemaphoreTake(sobj, _FS_TIMEOUT) == pdTRUE); /* FreeRTOS */
95
96 return ret;
97 }
98
99
100
101 /*------------------------------------------------------------------------*/
102 /* Release Grant to Access the Volume */
103 /*------------------------------------------------------------------------*/
104 /* This function is called on leaving file functions to unlock the volume.
105 */
106
ff_rel_grant(_SYNC_t sobj)107 void ff_rel_grant (
108 _SYNC_t sobj /* Sync object to be signaled */
109 )
110 {
111 ReleaseMutex(sobj); /* Win32 */
112
113 // sig_sem(sobj); /* uITRON */
114
115 // OSMutexPost(sobj); /* uC/OS-II */
116
117 // xSemaphoreGive(sobj); /* FreeRTOS */
118 }
119
120 #endif
121
122
123
124
125 #if _USE_LFN == 3 /* LFN with a working buffer on the heap */
126 /*------------------------------------------------------------------------*/
127 /* Allocate a memory block */
128 /*------------------------------------------------------------------------*/
129 /* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
130 */
131
ff_memalloc(UINT msize)132 void* ff_memalloc ( /* Returns pointer to the allocated memory block */
133 UINT msize /* Number of bytes to allocate */
134 )
135 {
136 return malloc(msize); /* Allocate a new memory block with POSIX API */
137 }
138
139
140 /*------------------------------------------------------------------------*/
141 /* Free a memory block */
142 /*------------------------------------------------------------------------*/
143
ff_memfree(void * mblock)144 void ff_memfree (
145 void* mblock /* Pointer to the memory block to free */
146 )
147 {
148 free(mblock); /* Discard the memory block with POSIX API */
149 }
150
151 #endif
152