fatfs/source/ffsystem.c

   1 /*------------------------------------------------------------------------*/
   2 /* Sample Code of OS Dependent Functions for FatFs                        */
   3 /* (C)ChaN, 2017                                                          */
   4 /*------------------------------------------------------------------------*/
   5
   6
   7 #include "ff.h"
   8
   9
  10
  11 #if FF_USE_LFN == 3     /* Dynamic memory allocation */
  12
  13 /*------------------------------------------------------------------------*/
  14 /* Allocate a memory block                                                */
  15 /*------------------------------------------------------------------------*/
  16
  17 void* ff_memalloc (     /* Returns pointer to the allocated memory block (null on not enough core) */
  18         UINT msize              /* Number of bytes to allocate */
  19 )
  20 {
  21         return malloc(msize);   /* Allocate a new memory block with POSIX API */
  22 }
  23
  24
  25 /*------------------------------------------------------------------------*/
  26 /* Free a memory block                                                    */
  27 /*------------------------------------------------------------------------*/
  28
  29 void ff_memfree (
  30         void* mblock    /* Pointer to the memory block to free (nothing to do for null) */
  31 )
  32 {
  33         free(mblock);   /* Free the memory block with POSIX API */
  34 }
  35
  36 #endif
  37
  38
  39
  40 #if FF_FS_REENTRANT     /* Mutal exclusion */
  41
  42 /*------------------------------------------------------------------------*/
  43 /* Create a Synchronization Object                                        */
  44 /*------------------------------------------------------------------------*/
  45 /* This function is called in f_mount() function to create a new
  46 /  synchronization object for the volume, such as semaphore and mutex.
  47 /  When a 0 is returned, the f_mount() function fails with FR_INT_ERR.
  48 */
  49
  50 //const osMutexDef_t Mutex[FF_VOLUMES]; /* CMSIS-RTOS */
  51
  52
  53 int ff_cre_syncobj (    /* 1:Function succeeded, 0:Could not create the sync object */
  54         BYTE vol,                       /* Corresponding volume (logical drive number) */
  55         FF_SYNC_t* sobj         /* Pointer to return the created sync object */
  56 )
  57 {
  58         /* Win32 */
  59         *sobj = CreateMutex(NULL, FALSE, NULL);
  60         return (int)(*sobj != INVALID_HANDLE_VALUE);
  61
  62         /* uITRON */
  63 //      T_CSEM csem = {TA_TPRI,1,1};
  64 //      *sobj = acre_sem(&csem);
  65 //      return (int)(*sobj > 0);
  66
  67         /* uC/OS-II */
  68 //      OS_ERR err;
  69 //      *sobj = OSMutexCreate(0, &err);
  70 //      return (int)(err == OS_NO_ERR);
  71
  72         /* FreeRTOS */
  73 //      *sobj = xSemaphoreCreateMutex();
  74 //      return (int)(*sobj != NULL);
  75
  76         /* CMSIS-RTOS */
  77 //      *sobj = osMutexCreate(Mutex + vol);
  78 //      return (int)(*sobj != NULL);
  79 }
  80
  81
  82 /*------------------------------------------------------------------------*/
  83 /* Delete a Synchronization Object                                        */
  84 /*------------------------------------------------------------------------*/
  85 /* This function is called in f_mount() function to delete a synchronization
  86 /  object that created with ff_cre_syncobj() function. When a 0 is returned,
  87 /  the f_mount() function fails with FR_INT_ERR.
  88 */
  89
  90 int ff_del_syncobj (    /* 1:Function succeeded, 0:Could not delete due to an error */
  91         FF_SYNC_t sobj          /* Sync object tied to the logical drive to be deleted */
  92 )
  93 {
  94         /* Win32 */
  95         return (int)CloseHandle(sobj);
  96
  97         /* uITRON */
  98 //      return (int)(del_sem(sobj) == E_OK);
  99
 100         /* uC/OS-II */
 101 //      OS_ERR err;
 102 //      OSMutexDel(sobj, OS_DEL_ALWAYS, &err);
 103 //      return (int)(err == OS_NO_ERR);
 104
 105         /* FreeRTOS */
 106 //  vSemaphoreDelete(sobj);
 107 //      return 1;
 108
 109         /* CMSIS-RTOS */
 110 //      return (int)(osMutexDelete(sobj) == osOK);
 111 }
 112
 113
 114 /*------------------------------------------------------------------------*/
 115 /* Request Grant to Access the Volume                                     */
 116 /*------------------------------------------------------------------------*/
 117 /* This function is called on entering file functions to lock the volume.
 118 /  When a 0 is returned, the file function fails with FR_TIMEOUT.
 119 */
 120
 121 int ff_req_grant (      /* 1:Got a grant to access the volume, 0:Could not get a grant */
 122         FF_SYNC_t sobj  /* Sync object to wait */
 123 )
 124 {
 125         /* Win32 */
 126         return (int)(WaitForSingleObject(sobj, FF_FS_TIMEOUT) == WAIT_OBJECT_0);
 127
 128         /* uITRON */
 129 //      return (int)(wai_sem(sobj) == E_OK);
 130
 131         /* uC/OS-II */
 132 //      OS_ERR err;
 133 //      OSMutexPend(sobj, FF_FS_TIMEOUT, &err));
 134 //      return (int)(err == OS_NO_ERR);
 135
 136         /* FreeRTOS */
 137 //      return (int)(xSemaphoreTake(sobj, FF_FS_TIMEOUT) == pdTRUE);
 138
 139         /* CMSIS-RTOS */
 140 //      return (int)(osMutexWait(sobj, FF_FS_TIMEOUT) == osOK);
 141 }
 142
 143
 144 /*------------------------------------------------------------------------*/
 145 /* Release Grant to Access the Volume                                     */
 146 /*------------------------------------------------------------------------*/
 147 /* This function is called on leaving file functions to unlock the volume.
 148 */
 149
 150 void ff_rel_grant (
 151         FF_SYNC_t sobj  /* Sync object to be signaled */
 152 )
 153 {
 154         /* Win32 */
 155         ReleaseMutex(sobj);
 156
 157         /* uITRON */
 158 //      sig_sem(sobj);
 159
 160         /* uC/OS-II */
 161 //      OSMutexPost(sobj);
 162
 163         /* FreeRTOS */
 164 //      xSemaphoreGive(sobj);
 165
 166         /* CMSIS-RTOS */
 167 //      osMutexRelease(sobj);
 168 }
 169
 170 #endif
 171