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  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.  
  171.