ffsystem-inc.h

/*
  Implementation header for FatFs system glue (header-only build)
  This file is intended to be included by ff.h only. Do not include directly
  from application code.
*/
/*------------------------------------------------------------------------*/
/* Sample Code of OS Dependent Functions for FatFs                        */
/* (C)ChaN, 2018                                                          */
/*------------------------------------------------------------------------*/
 
#include "ff.h"
 
namespace fatfs {
 
#if FF_FS_REENTRANT /* Mutal exclusion */
 
#error locking not implemented
/*------------------------------------------------------------------------*/
/* 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
 
}