How to flush data to disk in FreeRTOS FAT

Libraries
1

Hello everyone,
I can’t find a flush function in FreeRTOS FAT.
After calling ff_fwrite() function, i have to call ff_fclose() to flush data to disk. Then open the file again next writting time, it’s really unconveniant. Is there a way to synchronize the data to disk without calling ff_fclose?

2

You can call this to flush the data:

FF_SDDiskFlush(pxFile->pxIOManager->xBlkDevice.pxDisk);

where pxFile is your FF_FILE *pxFile.

But, it won’t update the file size. For that, if you like to live dangerously, you could try this:

// Make Filesize equal to the FilePointer
FF_Error_t FF_UpdateDirEnt( FF_FILE *pxFile )
{
FF_DirEnt_t xOriginalEntry;
FF_Error_t xError;

    	/* Get the directory entry and update it to show the new file size */
    	xError = FF_GetEntry( pxFile->pxIOManager, pxFile->usDirEntry, pxFile->ulDirCluster, &xOriginalEntry );

    	/* Now update the directory entry */
    	if( ( FF_isERR( xError ) == pdFALSE ) &&
    		( ( pxFile->ulFileSize != xOriginalEntry.ulFileSize ) || ( pxFile->ulFileSize == 0UL ) ) )
    	{
    		if( pxFile->ulFileSize == 0UL )
    		{
    			xOriginalEntry.ulObjectCluster = 0;
    		}

    		xOriginalEntry.ulFileSize = pxFile->ulFileSize;
    		xError = FF_PutEntry( pxFile->pxIOManager, pxFile->usDirEntry, pxFile->ulDirCluster, &xOriginalEntry, NULL );
    	}
    	return xError;    
    }