[457] | 1 | /*------------------------------------------------------------------------*/
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| 2 | /* Sample code of OS dependent synchronization object controls */
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| 3 | /* for FatFs R0.07a (C)ChaN, 2009 */
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| 4 | /*------------------------------------------------------------------------*/
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| 5 |
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| 6 | //#include <windows.h> // Win32
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| 7 | #include <kernel.h>
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| 8 | #include "kernel_cfg.h"
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| 9 | //#include <ucos_ii.h> // uC/OS-II
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| 10 |
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| 11 | #include "../ff.h"
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| 12 |
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| 13 | #if _FS_REENTRANT
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| 14 |
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| 15 | static const ID VolumeSemId[4] = {
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| 16 | SEMID_FATFS1,
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| 17 | SEMID_FATFS2,
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| 18 | SEMID_FATFS3,
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| 19 | SEMID_FATFS4
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| 20 | };
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| 21 |
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| 22 | /*------------------------------------------------------------------------*/
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| 23 | /* Create a Synchronization Object for a Volume */
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| 24 | /*------------------------------------------------------------------------*/
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| 25 | /* This function is called in f_mount function to create a new
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| 26 | / synchronization object, such as semaphore and mutex. When a FALSE is
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| 27 | / returned, the f_mount function fails with FR_INT_ERR.
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| 28 | */
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| 29 |
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| 30 | BOOL ff_cre_syncobj ( /* TRUE:Function succeeded, FALSE:Could not create due to any error */
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| 31 | BYTE vol, /* Corresponding logical drive being processed */
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| 32 | _SYNC_t *sobj /* Pointer to return the created sync object */
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| 33 | )
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| 34 | {
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| 35 | BOOL ret;
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| 36 |
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| 37 | // *sobj = CreateMutex(NULL, FALSE, NULL); // Win32
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| 38 | // ret = (*sobj != INVALID_HANDLE_VALUE) ? TRUE : FALSE; //
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| 39 |
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| 40 | *sobj = VolumeSemId[vol]; // uITRON (give a static created sync object)
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| 41 | ret = TRUE; // The initial value of the semaphore must be 1.
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| 42 |
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| 43 | // *sobj = OSMutexCreate(0, &err); // uC/OS-II
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| 44 | // ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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| 45 |
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| 46 | return ret;
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| 47 | }
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| 48 |
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| 49 |
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| 50 |
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| 51 | /*------------------------------------------------------------------------*/
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| 52 | /* Delete a Synchronization Object */
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| 53 | /*------------------------------------------------------------------------*/
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| 54 | /* This function is called in f_mount function to delete a synchronization
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| 55 | / object that created with ff_cre_syncobj function. When a FALSE is
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| 56 | / returned, the f_mount function fails with FR_INT_ERR.
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| 57 | */
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| 58 |
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| 59 | BOOL ff_del_syncobj ( /* TRUE:Function succeeded, FALSE:Could not delete due to any error */
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| 60 | _SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
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| 61 | )
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| 62 | {
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| 63 | BOOL ret;
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| 64 |
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| 65 | // ret = CloseHandle(sobj); // Win32
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| 66 |
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| 67 | ret = TRUE; // uITRON (nothing to do)
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| 68 |
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| 69 | // OSMutexDel(sobj, OS_DEL_ALWAYS, &err); // uC/OS-II
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| 70 | // ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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| 71 |
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| 72 | return ret;
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| 73 | }
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| 74 |
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| 75 |
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| 76 |
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| 77 | /*------------------------------------------------------------------------*/
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| 78 | /* Request Grant to Access the Volume */
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| 79 | /*------------------------------------------------------------------------*/
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| 80 | /* This function is called on entering file functions to lock the volume.
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| 81 | / When a FALSE is returned, the file function fails with FR_TIMEOUT.
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| 82 | */
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| 83 |
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| 84 | BOOL ff_req_grant ( /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */
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| 85 | _SYNC_t sobj /* Sync object to wait */
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| 86 | )
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| 87 | {
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| 88 | BOOL ret;
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| 89 |
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| 90 | // ret = (WaitForSingleObject(sobj, _TIMEOUT) == WAIT_OBJECT_0) ? TRUE : FALSE; // Win32
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| 91 |
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| 92 | ret = (wai_sem(sobj) == E_OK) ? TRUE : FALSE; // uITRON
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| 93 |
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| 94 | // OSMutexPend(sobj, _TIMEOUT, &err)); // uC/OS-II
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| 95 | // ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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| 96 |
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| 97 | return ret;
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| 98 | }
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| 99 |
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| 100 |
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| 101 |
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| 102 | /*------------------------------------------------------------------------*/
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| 103 | /* Release Grant to Access the Volume */
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| 104 | /*------------------------------------------------------------------------*/
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| 105 | /* This function is called on leaving file functions to unlock the volume.
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| 106 | */
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| 107 |
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| 108 | void ff_rel_grant (
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| 109 | _SYNC_t sobj /* Sync object to be signaled */
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| 110 | )
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| 111 | {
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| 112 | // ReleaseMutex(sobj); // Win32
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| 113 |
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| 114 | sig_sem(sobj); // uITRON
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| 115 |
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| 116 | // OSMutexPost(sobj); // uC/OS-II
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| 117 | }
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| 118 |
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| 119 |
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| 120 | #else
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| 121 |
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| 122 | #error This file is not needed in this configuration.
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| 123 |
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| 124 | #endif
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