Subversion Repositories NedoOS

/*------------------------------------------------------------------------*/
/* Sample Code of OS Dependent Functions for FatFs                        */
/* (C)ChaN, 2018                                                          */
/*------------------------------------------------------------------------*/


#include "ff.h"


#if FF_USE_LFN == 3     /* Dynamic memory allocation */

/*------------------------------------------------------------------------*/
/* Allocate a memory block                                                */
/*------------------------------------------------------------------------*/

void* ff_memalloc (     /* Returns pointer to the allocated memory block (null if not enough core) */
        UINT msize              /* Number of bytes to allocate */
)
{
        return malloc(msize);   /* Allocate a new memory block with POSIX API */
}


/*------------------------------------------------------------------------*/
/* Free a memory block                                                    */
/*------------------------------------------------------------------------*/

void ff_memfree (
        void* mblock    /* Pointer to the memory block to free (nothing to do if null) */
)
{
        free(mblock);   /* Free the memory block with POSIX API */
}

#endif



#if FF_FS_REENTRANT     /* Mutal exclusion */

/*------------------------------------------------------------------------*/
/* Create a Synchronization Object                                        */
/*------------------------------------------------------------------------*/
/* This function is called in f_mount() function to create a new
/  synchronization object for the volume, such as semaphore and mutex.
/  When a 0 is returned, the f_mount() function fails with FR_INT_ERR.
*/

//const osMutexDef_t Mutex[FF_VOLUMES]; /* Table of CMSIS-RTOS mutex */


int ff_cre_syncobj (    /* 1:Function succeeded, 0:Could not create the sync object */
        BYTE vol,                       /* Corresponding volume (logical drive number) */
        FF_SYNC_t* sobj         /* Pointer to return the created sync object */
)
{
        /* Win32 */
        *sobj = CreateMutex(NULL, FALSE, NULL);
        return (int)(*sobj != INVALID_HANDLE_VALUE);

        /* uITRON */
//      T_CSEM csem = {TA_TPRI,1,1};
//      *sobj = acre_sem(&csem);
//      return (int)(*sobj > 0);

        /* uC/OS-II */
//      OS_ERR err;
//      *sobj = OSMutexCreate(0, &err);
//      return (int)(err == OS_NO_ERR);

        /* FreeRTOS */
//      *sobj = xSemaphoreCreateMutex();
//      return (int)(*sobj != NULL);

        /* CMSIS-RTOS */
//      *sobj = osMutexCreate(&Mutex[vol]);
//      return (int)(*sobj != NULL);
}


/*------------------------------------------------------------------------*/
/* 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 0 is returned,
/  the f_mount() function fails with FR_INT_ERR.
*/

int ff_del_syncobj (    /* 1:Function succeeded, 0:Could not delete due to an error */
        FF_SYNC_t sobj          /* Sync object tied to the logical drive to be deleted */
)
{
        /* Win32 */
        return (int)CloseHandle(sobj);

        /* uITRON */
//      return (int)(del_sem(sobj) == E_OK);

        /* uC/OS-II */
//      OS_ERR err;
//      OSMutexDel(sobj, OS_DEL_ALWAYS, &err);
//      return (int)(err == OS_NO_ERR);

        /* FreeRTOS */
//  vSemaphoreDelete(sobj);
//      return 1;

        /* CMSIS-RTOS */
//      return (int)(osMutexDelete(sobj) == osOK);
}


/*------------------------------------------------------------------------*/
/* Request Grant to Access the Volume                                     */
/*------------------------------------------------------------------------*/
/* This function is called on entering file functions to lock the volume.
/  When a 0 is returned, the file function fails with FR_TIMEOUT.
*/

int ff_req_grant (      /* 1:Got a grant to access the volume, 0:Could not get a grant */
        FF_SYNC_t sobj  /* Sync object to wait */
)
{
        /* Win32 */
        return (int)(WaitForSingleObject(sobj, FF_FS_TIMEOUT) == WAIT_OBJECT_0);

        /* uITRON */
//      return (int)(wai_sem(sobj) == E_OK);

        /* uC/OS-II */
//      OS_ERR err;
//      OSMutexPend(sobj, FF_FS_TIMEOUT, &err));
//      return (int)(err == OS_NO_ERR);

        /* FreeRTOS */
//      return (int)(xSemaphoreTake(sobj, FF_FS_TIMEOUT) == pdTRUE);

        /* CMSIS-RTOS */
//      return (int)(osMutexWait(sobj, FF_FS_TIMEOUT) == osOK);
}


/*------------------------------------------------------------------------*/
/* Release Grant to Access the Volume                                     */
/*------------------------------------------------------------------------*/
/* This function is called on leaving file functions to unlock the volume.
*/

void ff_rel_grant (
        FF_SYNC_t sobj  /* Sync object to be signaled */
)
{
        /* Win32 */
        ReleaseMutex(sobj);

        /* uITRON */
//      sig_sem(sobj);

        /* uC/OS-II */
//      OSMutexPost(sobj);

        /* FreeRTOS */
//      xSemaphoreGive(sobj);

        /* CMSIS-RTOS */
//      osMutexRelease(sobj);
}

#endif