The size of the Petit FatFS module when compiled using AVR-GCC varies
between 1 kB-4 kB depending on configuration and optimization settings used. The table
below shows example compile sizes with different configuration options, using Atmel
Studio 7.0 with optimization for size. Default configuration is with
_USE_READ and _FS_FAT16 enabled, and all other
options disabled. These approximations are for the Petit FatFs module only, and does not
include the disk I/O layer.
| Size [bytes] | |
|---|---|
Flash (Default configuration) |
2064 |
Flash (!_USE_READ) |
-416 |
Flash (_USE_DIR) |
+688 |
Flash (_USE_LSEEK) |
+556 |
Flash (_USE_WRITE) |
+486 |
SRAM (bss) |
1 |
SRAM (data) |
42 |
Configuration can be customized according to what functions are required by
the application. The following table shows which functions are removed for each
configuration option, contained in the configuration header file
(pffconf.h).
| Function | _USE_READ 0 | _USE_DIR 0 | _USE_LSEEK 0 | _USE_WRITE 0 |
|---|---|---|---|---|
pf_mount |
||||
pf_open |
||||
pf_read |
x | |||
pf_lseek |
x | |||
pf_opendir |
x | |||
pf_readdir |
x | |||
pf_write |
x |