Ward Mattar / Mbed 2 deprecated Formula_LoRa_Transmitter

This is code is part of a Technion course project in advanced IoT, implementing a device to read and transmit sensors data from a Formula racing car built by students at Technion - Israel Institute of Technology.

Dependencies:   mbed Buffer

Fork of DISCO-L072CZ-LRWAN1_LoRa_PingPong by ST

This is code is part of a Technion course project in advanced IoT, implementing a device to read and transmit sensors data from a Formula racing car built by students at Technion - Israel Institute of Technology.

How to install

  • Create an account on Mbed: https://os.mbed.com/account/signup/
  • Import project into Compiler
  • In the Program Workspace select "Formula_Nucleo_Reader"
  • Select a Platform like so:
  1. Click button at top-left
  2. Add Board
  3. Search "B-L072Z-LRWAN1" and then "Add to your Mbed Compiler"
  • Finally click "Compile", if the build was successful, the binary would download automatically
  • To install it on device simply plug it in to a PC, open device drive and drag then drop binary file in it

FATFileSystem/ChaN/ffconf.h@12:02d779e8c4f6, 2018-05-19 (annotated)

Committer:
wardm
Date:
Sat May 19 11:41:10 2018 +0000
Revision:
12:02d779e8c4f6
Code for Technion Formula car sensors reader transmit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wardm 12:02d779e8c4f6 1 /*---------------------------------------------------------------------------/
wardm 12:02d779e8c4f6 2 / FatFs - FAT file system module configuration file R0.11a (C)ChaN, 2015
wardm 12:02d779e8c4f6 3 /---------------------------------------------------------------------------*/
wardm 12:02d779e8c4f6 4
wardm 12:02d779e8c4f6 5 #define _FFCONF 64180 /* Revision ID */
wardm 12:02d779e8c4f6 6
wardm 12:02d779e8c4f6 7 #define FFS_DBG 0
wardm 12:02d779e8c4f6 8
wardm 12:02d779e8c4f6 9 /*---------------------------------------------------------------------------/
wardm 12:02d779e8c4f6 10 / Function Configurations
wardm 12:02d779e8c4f6 11 /---------------------------------------------------------------------------*/
wardm 12:02d779e8c4f6 12
wardm 12:02d779e8c4f6 13 #define _FS_READONLY 0
wardm 12:02d779e8c4f6 14 /* This option switches read-only configuration. (0:Read/Write or 1:Read-only)
wardm 12:02d779e8c4f6 15 / Read-only configuration removes writing API functions, f_write(), f_sync(),
wardm 12:02d779e8c4f6 16 / f_unlink(), f_mkdir(), f_chmod(), f_rename(), f_truncate(), f_getfree()
wardm 12:02d779e8c4f6 17 / and optional writing functions as well. */
wardm 12:02d779e8c4f6 18
wardm 12:02d779e8c4f6 19
wardm 12:02d779e8c4f6 20 #define _FS_MINIMIZE 0
wardm 12:02d779e8c4f6 21 /* This option defines minimization level to remove some basic API functions.
wardm 12:02d779e8c4f6 22 /
wardm 12:02d779e8c4f6 23 / 0: All basic functions are enabled.
wardm 12:02d779e8c4f6 24 / 1: f_stat(), f_getfree(), f_unlink(), f_mkdir(), f_chmod(), f_utime(),
wardm 12:02d779e8c4f6 25 / f_truncate() and f_rename() function are removed.
wardm 12:02d779e8c4f6 26 / 2: f_opendir(), f_readdir() and f_closedir() are removed in addition to 1.
wardm 12:02d779e8c4f6 27 / 3: f_lseek() function is removed in addition to 2. */
wardm 12:02d779e8c4f6 28
wardm 12:02d779e8c4f6 29
wardm 12:02d779e8c4f6 30 #define _USE_STRFUNC 0
wardm 12:02d779e8c4f6 31 /* This option switches string functions, f_gets(), f_putc(), f_puts() and
wardm 12:02d779e8c4f6 32 / f_printf().
wardm 12:02d779e8c4f6 33 /
wardm 12:02d779e8c4f6 34 / 0: Disable string functions.
wardm 12:02d779e8c4f6 35 / 1: Enable without LF-CRLF conversion.
wardm 12:02d779e8c4f6 36 / 2: Enable with LF-CRLF conversion. */
wardm 12:02d779e8c4f6 37
wardm 12:02d779e8c4f6 38
wardm 12:02d779e8c4f6 39 #define _USE_FIND 0
wardm 12:02d779e8c4f6 40 /* This option switches filtered directory read feature and related functions,
wardm 12:02d779e8c4f6 41 / f_findfirst() and f_findnext(). (0:Disable or 1:Enable) */
wardm 12:02d779e8c4f6 42
wardm 12:02d779e8c4f6 43
wardm 12:02d779e8c4f6 44 #define _USE_MKFS 1
wardm 12:02d779e8c4f6 45 /* This option switches f_mkfs() function. (0:Disable or 1:Enable) */
wardm 12:02d779e8c4f6 46
wardm 12:02d779e8c4f6 47
wardm 12:02d779e8c4f6 48 #define _USE_FASTSEEK 0
wardm 12:02d779e8c4f6 49 /* This option switches fast seek feature. (0:Disable or 1:Enable) */
wardm 12:02d779e8c4f6 50
wardm 12:02d779e8c4f6 51
wardm 12:02d779e8c4f6 52 #define _USE_LABEL 0
wardm 12:02d779e8c4f6 53 /* This option switches volume label functions, f_getlabel() and f_setlabel().
wardm 12:02d779e8c4f6 54 / (0:Disable or 1:Enable) */
wardm 12:02d779e8c4f6 55
wardm 12:02d779e8c4f6 56
wardm 12:02d779e8c4f6 57 #define _USE_FORWARD 0
wardm 12:02d779e8c4f6 58 /* This option switches f_forward() function. (0:Disable or 1:Enable)
wardm 12:02d779e8c4f6 59 / To enable it, also _FS_TINY need to be set to 1. */
wardm 12:02d779e8c4f6 60
wardm 12:02d779e8c4f6 61
wardm 12:02d779e8c4f6 62 /*---------------------------------------------------------------------------/
wardm 12:02d779e8c4f6 63 / Locale and Namespace Configurations
wardm 12:02d779e8c4f6 64 /---------------------------------------------------------------------------*/
wardm 12:02d779e8c4f6 65
wardm 12:02d779e8c4f6 66 #define _CODE_PAGE 850
wardm 12:02d779e8c4f6 67 /* This option specifies the OEM code page to be used on the target system.
wardm 12:02d779e8c4f6 68 / Incorrect setting of the code page can cause a file open failure.
wardm 12:02d779e8c4f6 69 /
wardm 12:02d779e8c4f6 70 / 1 - ASCII (No extended character. Non-LFN cfg. only)
wardm 12:02d779e8c4f6 71 / 437 - U.S.
wardm 12:02d779e8c4f6 72 / 720 - Arabic
wardm 12:02d779e8c4f6 73 / 737 - Greek
wardm 12:02d779e8c4f6 74 / 771 - KBL
wardm 12:02d779e8c4f6 75 / 775 - Baltic
wardm 12:02d779e8c4f6 76 / 850 - Latin 1
wardm 12:02d779e8c4f6 77 / 852 - Latin 2
wardm 12:02d779e8c4f6 78 / 855 - Cyrillic
wardm 12:02d779e8c4f6 79 / 857 - Turkish
wardm 12:02d779e8c4f6 80 / 860 - Portuguese
wardm 12:02d779e8c4f6 81 / 861 - Icelandic
wardm 12:02d779e8c4f6 82 / 862 - Hebrew
wardm 12:02d779e8c4f6 83 / 863 - Canadian French
wardm 12:02d779e8c4f6 84 / 864 - Arabic
wardm 12:02d779e8c4f6 85 / 865 - Nordic
wardm 12:02d779e8c4f6 86 / 866 - Russian
wardm 12:02d779e8c4f6 87 / 869 - Greek 2
wardm 12:02d779e8c4f6 88 / 932 - Japanese (DBCS)
wardm 12:02d779e8c4f6 89 / 936 - Simplified Chinese (DBCS)
wardm 12:02d779e8c4f6 90 / 949 - Korean (DBCS)
wardm 12:02d779e8c4f6 91 / 950 - Traditional Chinese (DBCS)
wardm 12:02d779e8c4f6 92 */
wardm 12:02d779e8c4f6 93
wardm 12:02d779e8c4f6 94
wardm 12:02d779e8c4f6 95 #define _USE_LFN 1
wardm 12:02d779e8c4f6 96 #define _MAX_LFN 255
wardm 12:02d779e8c4f6 97 /* The _USE_LFN option switches the LFN feature.
wardm 12:02d779e8c4f6 98 /
wardm 12:02d779e8c4f6 99 / 0: Disable LFN feature. _MAX_LFN has no effect.
wardm 12:02d779e8c4f6 100 / 1: Enable LFN with static working buffer on the BSS. Always NOT thread-safe.
wardm 12:02d779e8c4f6 101 / 2: Enable LFN with dynamic working buffer on the STACK.
wardm 12:02d779e8c4f6 102 / 3: Enable LFN with dynamic working buffer on the HEAP.
wardm 12:02d779e8c4f6 103 /
wardm 12:02d779e8c4f6 104 / When enable the LFN feature, Unicode handling functions (option/unicode.c) must
wardm 12:02d779e8c4f6 105 / be added to the project. The LFN working buffer occupies (_MAX_LFN + 1) * 2 bytes.
wardm 12:02d779e8c4f6 106 / When use stack for the working buffer, take care on stack overflow. When use heap
wardm 12:02d779e8c4f6 107 / memory for the working buffer, memory management functions, ff_memalloc() and
wardm 12:02d779e8c4f6 108 / ff_memfree(), must be added to the project. */
wardm 12:02d779e8c4f6 109
wardm 12:02d779e8c4f6 110
wardm 12:02d779e8c4f6 111 #define _LFN_UNICODE 0
wardm 12:02d779e8c4f6 112 /* This option switches character encoding on the API. (0:ANSI/OEM or 1:Unicode)
wardm 12:02d779e8c4f6 113 / To use Unicode string for the path name, enable LFN feature and set _LFN_UNICODE
wardm 12:02d779e8c4f6 114 / to 1. This option also affects behavior of string I/O functions. */
wardm 12:02d779e8c4f6 115
wardm 12:02d779e8c4f6 116
wardm 12:02d779e8c4f6 117 #define _STRF_ENCODE 3
wardm 12:02d779e8c4f6 118 /* When _LFN_UNICODE is 1, this option selects the character encoding on the file to
wardm 12:02d779e8c4f6 119 / be read/written via string I/O functions, f_gets(), f_putc(), f_puts and f_printf().
wardm 12:02d779e8c4f6 120 /
wardm 12:02d779e8c4f6 121 / 0: ANSI/OEM
wardm 12:02d779e8c4f6 122 / 1: UTF-16LE
wardm 12:02d779e8c4f6 123 / 2: UTF-16BE
wardm 12:02d779e8c4f6 124 / 3: UTF-8
wardm 12:02d779e8c4f6 125 /
wardm 12:02d779e8c4f6 126 / When _LFN_UNICODE is 0, this option has no effect. */
wardm 12:02d779e8c4f6 127
wardm 12:02d779e8c4f6 128
wardm 12:02d779e8c4f6 129 #define _FS_RPATH 0
wardm 12:02d779e8c4f6 130 /* This option configures relative path feature.
wardm 12:02d779e8c4f6 131 /
wardm 12:02d779e8c4f6 132 / 0: Disable relative path feature and remove related functions.
wardm 12:02d779e8c4f6 133 / 1: Enable relative path feature. f_chdir() and f_chdrive() are available.
wardm 12:02d779e8c4f6 134 / 2: f_getcwd() function is available in addition to 1.
wardm 12:02d779e8c4f6 135 /
wardm 12:02d779e8c4f6 136 / Note that directory items read via f_readdir() are affected by this option. */
wardm 12:02d779e8c4f6 137
wardm 12:02d779e8c4f6 138
wardm 12:02d779e8c4f6 139 /*---------------------------------------------------------------------------/
wardm 12:02d779e8c4f6 140 / Drive/Volume Configurations
wardm 12:02d779e8c4f6 141 /---------------------------------------------------------------------------*/
wardm 12:02d779e8c4f6 142
wardm 12:02d779e8c4f6 143 #define _VOLUMES 1
wardm 12:02d779e8c4f6 144 /* Number of volumes (logical drives) to be used. */
wardm 12:02d779e8c4f6 145
wardm 12:02d779e8c4f6 146
wardm 12:02d779e8c4f6 147 #define _STR_VOLUME_ID 0
wardm 12:02d779e8c4f6 148 #define _VOLUME_STRS "RAM","NAND","CF","SD1","SD2","USB1","USB2","USB3"
wardm 12:02d779e8c4f6 149 /* _STR_VOLUME_ID option switches string volume ID feature.
wardm 12:02d779e8c4f6 150 / When _STR_VOLUME_ID is set to 1, also pre-defined strings can be used as drive
wardm 12:02d779e8c4f6 151 / number in the path name. _VOLUME_STRS defines the drive ID strings for each
wardm 12:02d779e8c4f6 152 / logical drives. Number of items must be equal to _VOLUMES. Valid characters for
wardm 12:02d779e8c4f6 153 / the drive ID strings are: A-Z and 0-9. */
wardm 12:02d779e8c4f6 154
wardm 12:02d779e8c4f6 155
wardm 12:02d779e8c4f6 156 #define _MULTI_PARTITION 0
wardm 12:02d779e8c4f6 157 /* This option switches multi-partition feature. By default (0), each logical drive
wardm 12:02d779e8c4f6 158 / number is bound to the same physical drive number and only an FAT volume found on
wardm 12:02d779e8c4f6 159 / the physical drive will be mounted. When multi-partition feature is enabled (1),
wardm 12:02d779e8c4f6 160 / each logical drive number is bound to arbitrary physical drive and partition
wardm 12:02d779e8c4f6 161 / listed in the VolToPart[]. Also f_fdisk() funciton will be available. */
wardm 12:02d779e8c4f6 162
wardm 12:02d779e8c4f6 163
wardm 12:02d779e8c4f6 164 #define _MIN_SS 512
wardm 12:02d779e8c4f6 165 #define _MAX_SS 512
wardm 12:02d779e8c4f6 166 /* These options configure the range of sector size to be supported. (512, 1024,
wardm 12:02d779e8c4f6 167 / 2048 or 4096) Always set both 512 for most systems, all type of memory cards and
wardm 12:02d779e8c4f6 168 / harddisk. But a larger value may be required for on-board flash memory and some
wardm 12:02d779e8c4f6 169 / type of optical media. When _MAX_SS is larger than _MIN_SS, FatFs is configured
wardm 12:02d779e8c4f6 170 / to variable sector size and GET_SECTOR_SIZE command must be implemented to the
wardm 12:02d779e8c4f6 171 / disk_ioctl() function. */
wardm 12:02d779e8c4f6 172
wardm 12:02d779e8c4f6 173
wardm 12:02d779e8c4f6 174 #define _USE_TRIM 0
wardm 12:02d779e8c4f6 175 /* This option switches ATA-TRIM feature. (0:Disable or 1:Enable)
wardm 12:02d779e8c4f6 176 / To enable Trim feature, also CTRL_TRIM command should be implemented to the
wardm 12:02d779e8c4f6 177 / disk_ioctl() function. */
wardm 12:02d779e8c4f6 178
wardm 12:02d779e8c4f6 179
wardm 12:02d779e8c4f6 180 #define _FS_NOFSINFO 0
wardm 12:02d779e8c4f6 181 /* If you need to know correct free space on the FAT32 volume, set bit 0 of this
wardm 12:02d779e8c4f6 182 / option, and f_getfree() function at first time after volume mount will force
wardm 12:02d779e8c4f6 183 / a full FAT scan. Bit 1 controls the use of last allocated cluster number.
wardm 12:02d779e8c4f6 184 /
wardm 12:02d779e8c4f6 185 / bit0=0: Use free cluster count in the FSINFO if available.
wardm 12:02d779e8c4f6 186 / bit0=1: Do not trust free cluster count in the FSINFO.
wardm 12:02d779e8c4f6 187 / bit1=0: Use last allocated cluster number in the FSINFO if available.
wardm 12:02d779e8c4f6 188 / bit1=1: Do not trust last allocated cluster number in the FSINFO.
wardm 12:02d779e8c4f6 189 */
wardm 12:02d779e8c4f6 190
wardm 12:02d779e8c4f6 191
wardm 12:02d779e8c4f6 192
wardm 12:02d779e8c4f6 193 /*---------------------------------------------------------------------------/
wardm 12:02d779e8c4f6 194 / System Configurations
wardm 12:02d779e8c4f6 195 /---------------------------------------------------------------------------*/
wardm 12:02d779e8c4f6 196
wardm 12:02d779e8c4f6 197 #define _FS_TINY 0
wardm 12:02d779e8c4f6 198 /* This option switches tiny buffer configuration. (0:Normal or 1:Tiny)
wardm 12:02d779e8c4f6 199 / At the tiny configuration, size of the file object (FIL) is reduced _MAX_SS
wardm 12:02d779e8c4f6 200 / bytes. Instead of private sector buffer eliminated from the file object,
wardm 12:02d779e8c4f6 201 / common sector buffer in the file system object (FATFS) is used for the file
wardm 12:02d779e8c4f6 202 / data transfer. */
wardm 12:02d779e8c4f6 203
wardm 12:02d779e8c4f6 204
wardm 12:02d779e8c4f6 205 #define _FS_NORTC 0
wardm 12:02d779e8c4f6 206 #define _NORTC_MON 1
wardm 12:02d779e8c4f6 207 #define _NORTC_MDAY 1
wardm 12:02d779e8c4f6 208 #define _NORTC_YEAR 2015
wardm 12:02d779e8c4f6 209 /* The _FS_NORTC option switches timestamp feature. If the system does not have
wardm 12:02d779e8c4f6 210 / an RTC function or valid timestamp is not needed, set _FS_NORTC to 1 to disable
wardm 12:02d779e8c4f6 211 / the timestamp feature. All objects modified by FatFs will have a fixed timestamp
wardm 12:02d779e8c4f6 212 / defined by _NORTC_MON, _NORTC_MDAY and _NORTC_YEAR.
wardm 12:02d779e8c4f6 213 / When timestamp feature is enabled (_FS_NORTC == 0), get_fattime() function need
wardm 12:02d779e8c4f6 214 / to be added to the project to read current time form RTC. _NORTC_MON,
wardm 12:02d779e8c4f6 215 / _NORTC_MDAY and _NORTC_YEAR have no effect.
wardm 12:02d779e8c4f6 216 / These options have no effect at read-only configuration (_FS_READONLY == 1). */
wardm 12:02d779e8c4f6 217
wardm 12:02d779e8c4f6 218
wardm 12:02d779e8c4f6 219 #define _FS_LOCK 0
wardm 12:02d779e8c4f6 220 /* The _FS_LOCK option switches file lock feature to control duplicated file open
wardm 12:02d779e8c4f6 221 / and illegal operation to open objects. This option must be 0 when _FS_READONLY
wardm 12:02d779e8c4f6 222 / is 1.
wardm 12:02d779e8c4f6 223 /
wardm 12:02d779e8c4f6 224 / 0: Disable file lock feature. To avoid volume corruption, application program
wardm 12:02d779e8c4f6 225 / should avoid illegal open, remove and rename to the open objects.
wardm 12:02d779e8c4f6 226 / >0: Enable file lock feature. The value defines how many files/sub-directories
wardm 12:02d779e8c4f6 227 / can be opened simultaneously under file lock control. Note that the file
wardm 12:02d779e8c4f6 228 / lock feature is independent of re-entrancy. */
wardm 12:02d779e8c4f6 229
wardm 12:02d779e8c4f6 230
wardm 12:02d779e8c4f6 231 #define _FS_REENTRANT 0
wardm 12:02d779e8c4f6 232 #define _FS_TIMEOUT 1000
wardm 12:02d779e8c4f6 233 #define _SYNC_t HANDLE
wardm 12:02d779e8c4f6 234 /* The _FS_REENTRANT option switches the re-entrancy (thread safe) of the FatFs
wardm 12:02d779e8c4f6 235 / module itself. Note that regardless of this option, file access to different
wardm 12:02d779e8c4f6 236 / volume is always re-entrant and volume control functions, f_mount(), f_mkfs()
wardm 12:02d779e8c4f6 237 / and f_fdisk() function, are always not re-entrant. Only file/directory access
wardm 12:02d779e8c4f6 238 / to the same volume is under control of this feature.
wardm 12:02d779e8c4f6 239 /
wardm 12:02d779e8c4f6 240 / 0: Disable re-entrancy. _FS_TIMEOUT and _SYNC_t have no effect.
wardm 12:02d779e8c4f6 241 / 1: Enable re-entrancy. Also user provided synchronization handlers,
wardm 12:02d779e8c4f6 242 / ff_req_grant(), ff_rel_grant(), ff_del_syncobj() and ff_cre_syncobj()
wardm 12:02d779e8c4f6 243 / function, must be added to the project. Samples are available in
wardm 12:02d779e8c4f6 244 / option/syscall.c.
wardm 12:02d779e8c4f6 245 /
wardm 12:02d779e8c4f6 246 / The _FS_TIMEOUT defines timeout period in unit of time tick.
wardm 12:02d779e8c4f6 247 / The _SYNC_t defines O/S dependent sync object type. e.g. HANDLE, ID, OS_EVENT*,
wardm 12:02d779e8c4f6 248 / SemaphoreHandle_t and etc.. A header file for O/S definitions needs to be
wardm 12:02d779e8c4f6 249 / included somewhere in the scope of ff.c. */
wardm 12:02d779e8c4f6 250
wardm 12:02d779e8c4f6 251
wardm 12:02d779e8c4f6 252 #define _WORD_ACCESS 0
wardm 12:02d779e8c4f6 253 /* The _WORD_ACCESS option is an only platform dependent option. It defines
wardm 12:02d779e8c4f6 254 / which access method is used to the word data on the FAT volume.
wardm 12:02d779e8c4f6 255 /
wardm 12:02d779e8c4f6 256 / 0: Byte-by-byte access. Always compatible with all platforms.
wardm 12:02d779e8c4f6 257 / 1: Word access. Do not choose this unless under both the following conditions.
wardm 12:02d779e8c4f6 258 /
wardm 12:02d779e8c4f6 259 / * Address misaligned memory access is always allowed to ALL instructions.
wardm 12:02d779e8c4f6 260 / * Byte order on the memory is little-endian.
wardm 12:02d779e8c4f6 261 /
wardm 12:02d779e8c4f6 262 / If it is the case, _WORD_ACCESS can also be set to 1 to reduce code size.
wardm 12:02d779e8c4f6 263 / Following table shows allowable settings of some type of processors.
wardm 12:02d779e8c4f6 264 /
wardm 12:02d779e8c4f6 265 / ARM7TDMI 0 *2 ColdFire 0 *1 V850E 0 *2
wardm 12:02d779e8c4f6 266 / Cortex-M3 0 *3 Z80 0/1 V850ES 0/1
wardm 12:02d779e8c4f6 267 / Cortex-M0 0 *2 x86 0/1 TLCS-870 0/1
wardm 12:02d779e8c4f6 268 / AVR 0/1 RX600(LE) 0/1 TLCS-900 0/1
wardm 12:02d779e8c4f6 269 / AVR32 0 *1 RL78 0 *2 R32C 0 *2
wardm 12:02d779e8c4f6 270 / PIC18 0/1 SH-2 0 *1 M16C 0/1
wardm 12:02d779e8c4f6 271 / PIC24 0 *2 H8S 0 *1 MSP430 0 *2
wardm 12:02d779e8c4f6 272 / PIC32 0 *1 H8/300H 0 *1 8051 0/1
wardm 12:02d779e8c4f6 273 /
wardm 12:02d779e8c4f6 274 / *1:Big-endian.
wardm 12:02d779e8c4f6 275 / *2:Unaligned memory access is not supported.
wardm 12:02d779e8c4f6 276 / *3:Some compilers generate LDM/STM for mem_cpy function.
wardm 12:02d779e8c4f6 277 */
wardm 12:02d779e8c4f6 278
wardm 12:02d779e8c4f6 279 #define FLUSH_ON_NEW_CLUSTER 0 /* Sync the file on every new cluster */
wardm 12:02d779e8c4f6 280 #define FLUSH_ON_NEW_SECTOR 1 /* Sync the file on every new sector */
wardm 12:02d779e8c4f6 281 /* Only one of these two defines needs to be set to 1. If both are set to 0
wardm 12:02d779e8c4f6 282 the file is only sync when closed.
wardm 12:02d779e8c4f6 283 Clusters are group of sectors (eg: 8 sectors). Flushing on new cluster means
wardm 12:02d779e8c4f6 284 it would be less often than flushing on new sector. Sectors are generally
wardm 12:02d779e8c4f6 285 512 Bytes long. */