00001 /*------------------------------------------------------------------------*/ 00002 /* Sample code of OS dependent synchronization object controls */ 00003 /* for FatFs R0.07d (C)ChaN, 2009 */ 00004 /*------------------------------------------------------------------------*/ 00005 00006 #include <windows.h> // Win32 00007 //#include <ucos_ii.h> // uC/OS-II 00008 00009 #include "../ff.h" 00010 00011 #if _FS_REENTRANT 00012 00013 /*------------------------------------------------------------------------*/ 00014 /* Create a Synchronization Object for a Volume 00015 /*------------------------------------------------------------------------*/ 00016 /* This function is called in f_mount function to create a new 00017 / synchronization object, such as semaphore and mutex. When a FALSE is 00018 / returned, the f_mount function fails with FR_INT_ERR. 00019 */ 00020 00021 BOOL ff_cre_syncobj ( /* TRUE:Function succeeded, FALSE:Could not create due to any error */ 00022 BYTE vol, /* Corresponding logical drive being processed */ 00023 _SYNC_t *sobj /* Pointer to return the created sync object */ 00024 ) 00025 { 00026 BOOL ret; 00027 00028 *sobj = CreateMutex(NULL, FALSE, NULL); // Win32 00029 ret = (*sobj != INVALID_HANDLE_VALUE) ? TRUE : FALSE; // 00030 00031 // *sobj = VolumeSemId[vol]; // uITRON (give a static created sync object) 00032 // ret = TRUE; // The initial value of the semaphore must be 1. 00033 00034 // *sobj = OSMutexCreate(0, &err); // uC/OS-II 00035 // ret = (err == OS_NO_ERR) ? TRUE : FALSE; // 00036 00037 return ret; 00038 } 00039 00040 00041 00042 /*------------------------------------------------------------------------*/ 00043 /* Delete a Synchronization Object */ 00044 /*------------------------------------------------------------------------*/ 00045 /* This function is called in f_mount function to delete a synchronization 00046 / object that created with ff_cre_syncobj function. When a FALSE is 00047 / returned, the f_mount function fails with FR_INT_ERR. 00048 */ 00049 00050 BOOL ff_del_syncobj ( /* TRUE:Function succeeded, FALSE:Could not delete due to any error */ 00051 _SYNC_t sobj /* Sync object tied to the logical drive to be deleted */ 00052 ) 00053 { 00054 BOOL ret; 00055 00056 ret = CloseHandle(sobj); // Win32 00057 00058 // ret = TRUE; // uITRON (nothing to do) 00059 00060 // OSMutexDel(sobj, OS_DEL_ALWAYS, &err); // uC/OS-II 00061 // ret = (err == OS_NO_ERR) ? TRUE : FALSE; // 00062 00063 return ret; 00064 } 00065 00066 00067 00068 /*------------------------------------------------------------------------*/ 00069 /* Request Grant to Access the Volume */ 00070 /*------------------------------------------------------------------------*/ 00071 /* This function is called on entering file functions to lock the volume. 00072 / When a FALSE is returned, the file function fails with FR_TIMEOUT. 00073 */ 00074 00075 BOOL ff_req_grant ( /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */ 00076 _SYNC_t sobj /* Sync object to wait */ 00077 ) 00078 { 00079 BOOL ret; 00080 00081 ret = (WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0) ? TRUE : FALSE; // Win32 00082 00083 // ret = (wai_sem(sobj) == E_OK) ? TRUE : FALSE; // uITRON 00084 00085 // OSMutexPend(sobj, _FS_TIMEOUT, &err)); // uC/OS-II 00086 // ret = (err == OS_NO_ERR) ? TRUE : FALSE; // 00087 00088 return ret; 00089 } 00090 00091 00092 00093 /*------------------------------------------------------------------------*/ 00094 /* Release Grant to Access the Volume */ 00095 /*------------------------------------------------------------------------*/ 00096 /* This function is called on leaving file functions to unlock the volume. 00097 */ 00098 00099 void ff_rel_grant ( 00100 _SYNC_t sobj /* Sync object to be signaled */ 00101 ) 00102 { 00103 ReleaseMutex(sobj); // Win32 00104 00105 // sig_sem(sobj); // uITRON 00106 00107 // OSMutexPost(sobj); // uC/OS-II 00108 } 00109 00110 00111 #else 00112 00113 #error This file is not needed in this configuration. 00114 00115 #endif