void Task1 (void)
{
   ...

   for (;;)
   {
      status  = f_open(&appFile, log_name, FA_OPEN_ALWAYS | FA_WRITE);
      status = f_write(&appFile, temp, strlen(temp), &bw);
      status = f_close(&appFile);
   }
   osDelay(1000);
}

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


#include "ff.h"
#include "cmsis_os.h"
#include "cmsis_os2.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 */
)
{
   /* CMSIS-RTOS */
//   *sobj = osMutexNew(&Mutex[vol]);
   *sobj = osSemaphoreNew(1, 1, NULL);
   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 */
)
{
   /* CMSIS-RTOS */
//   return (int)(osMutexDelete(sobj) == osOK);
   return (int)(osSemaphoreDelete (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 */
)
{
   /* CMSIS-RTOS */
//   return (int)(osMutexWait(sobj, FF_FS_TIMEOUT) == osOK);
   return (int)(osSemaphoreAcquire(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 */
)
{
   /* CMSIS-RTOS */
//   osMutexRelease(sobj);
   osSemaphoreRelease(sobj);
}

#endif