/*------------------------------------------------------------------------*/ | |
/* Sample code of OS dependent controls for FatFs R0.08 */ | |
/* (C)ChaN, 2010 */ | |
/*------------------------------------------------------------------------*/ | |
#include <stdlib.h> /* ANSI memory controls */ | |
#include <malloc.h> /* ANSI memory controls */ | |
#include "../ff.h" | |
#if _FS_REENTRANT | |
/*------------------------------------------------------------------------*/ | |
/* Create a Synchronization Object | |
/*------------------------------------------------------------------------*/ | |
/* This function is called in f_mount function to create a new | |
/ synchronization object, such as semaphore and mutex. When a FALSE is | |
/ returned, the f_mount function fails with FR_INT_ERR. | |
*/ | |
BOOL ff_cre_syncobj ( /* TRUE:Function succeeded, FALSE:Could not create due to any error */ | |
BYTE vol, /* Corresponding logical drive being processed */ | |
_SYNC_t *sobj /* Pointer to return the created sync object */ | |
) | |
{ | |
BOOL ret; | |
*sobj = CreateMutex(NULL, FALSE, NULL); /* Win32 */ | |
ret = (*sobj != INVALID_HANDLE_VALUE) ? TRUE : FALSE; | |
// *sobj = SyncObjects[vol]; /* uITRON (give a static created sync object) */ | |
// ret = TRUE; /* The initial value of the semaphore must be 1. */ | |
// *sobj = OSMutexCreate(0, &err); /* uC/OS-II */ | |
// ret = (err == OS_NO_ERR) ? TRUE : FALSE; | |
// *sobj = xSemaphoreCreateMutex(); /* FreeRTOS */ | |
// ret = (*sobj != NULL) ? TRUE : FALSE; | |
return ret; | |
} | |
/*------------------------------------------------------------------------*/ | |
/* Delete a Synchronization Object */ | |
/*------------------------------------------------------------------------*/ | |
/* This function is called in f_mount function to delete a synchronization | |
/ object that created with ff_cre_syncobj function. When a FALSE is | |
/ returned, the f_mount function fails with FR_INT_ERR. | |
*/ | |
BOOL ff_del_syncobj ( /* TRUE:Function succeeded, FALSE:Could not delete due to any error */ | |
_SYNC_t sobj /* Sync object tied to the logical drive to be deleted */ | |
) | |
{ | |
BOOL ret; | |
ret = CloseHandle(sobj); /* Win32 * | |
// ret = TRUE; /* uITRON (nothing to do) * | |
// OSMutexDel(sobj, OS_DEL_ALWAYS, &err); /* uC/OS-II */ | |
// ret = (err == OS_NO_ERR) ? TRUE : FALSE; | |
// ret = TRUE; /* FreeRTOS (nothing to do) */ | |
return ret; | |
} | |
/*------------------------------------------------------------------------*/ | |
/* Request Grant to Access the Volume */ | |
/*------------------------------------------------------------------------*/ | |
/* This function is called on entering file functions to lock the volume. | |
/ When a FALSE is returned, the file function fails with FR_TIMEOUT. | |
*/ | |
BOOL ff_req_grant ( /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */ | |
_SYNC_t sobj /* Sync object to wait */ | |
) | |
{ | |
BOOL ret; | |
ret = (WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0) ? TRUE : FALSE; /* Win32 */ | |
// ret = (wai_sem(sobj) == E_OK) ? TRUE : FALSE; /* uITRON */ | |
// OSMutexPend(sobj, _FS_TIMEOUT, &err)); /* uC/OS-II */ | |
// ret = (err == OS_NO_ERR) ? TRUE : FALSE; | |
// ret = (xSemaphoreTake(sobj, _FS_TIMEOUT) == pdTRUE) ? TRUE : FALSE; /* FreeRTOS */ | |
return ret; | |
} | |
/*------------------------------------------------------------------------*/ | |
/* Release Grant to Access the Volume */ | |
/*------------------------------------------------------------------------*/ | |
/* This function is called on leaving file functions to unlock the volume. | |
*/ | |
void ff_rel_grant ( | |
_SYNC_t sobj /* Sync object to be signaled */ | |
) | |
{ | |
ReleaseMutex(sobj); /* Win32 */ | |
// sig_sem(sobj); /* uITRON */ | |
// OSMutexPost(sobj); /* uC/OS-II */ | |
// xSemaphoreGive(sobj); /* FreeRTOS */ | |
} | |
#endif | |
#if _USE_LFN == 3 /* LFN with a working buffer on the heap */ | |
/*------------------------------------------------------------------------*/ | |
/* Allocate a memory block */ | |
/*------------------------------------------------------------------------*/ | |
/* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE. | |
*/ | |
void* ff_memalloc ( /* Returns pointer to the allocated memory block */ | |
UINT size /* Number of bytes to allocate */ | |
) | |
{ | |
return malloc(size); | |
} | |
/*------------------------------------------------------------------------*/ | |
/* Free a memory block */ | |
/*------------------------------------------------------------------------*/ | |
void ff_memfree( | |
void* mblock /* Pointer to the memory block to free */ | |
) | |
{ | |
free(mblock); | |
} | |
#endif |