Datasheet

Cf_Fat_Get_Swap_File
267
MIKROELEKTRONIKA - SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD
Libraries
mikroC PRO for AVR
CHAPTER 6
Prototype
unsigned long Cf_Fat_Get_Swap_File(unsigned long sectors_cnt,
char *filename, char file_attr);
Returns
- Number of the start sector for the newly created swap file, if there was
enough free space on CF card to create file of required size.
- 0 - otherwise.
Description
This function is used to create a swap file of predefined name and size on the
CF media. If a file with specified name already exists on the media, search for
consecutive sectors will ignore sectors occupied by this file. Therefore, it is rec-
ommended to erase such file if it exists before calling this function. If it is not
erased and there is still enough space for a new swap file, this function will
delete it after allocating new memory space for a new swap file.
The purpose of the swap file is to make reading and writing to CF media as fast
as possible, by using the Cf_Read_Sector() and Cf_Write_Sector() functions
directly, without potentially damaging the FAT system. Swap file can be consid-
ered as a "window" on the media where the user can freely write/read data. It's
main purpose in the mikroC's library is to be used for fast data acquisition; when
the time-critical acquisition has finished, the data can be re-written into a "nor-
mal" file, and formatted in the most suitable way.
Parameters:
-
sectors_cnt: number of consecutive sectors that user wants the
swap file to have.
- filename: name of the file that should be assigned for file operations.
The file name should be in DOS 8.3 (file_name.extension) format. The
file name and extension will be automatically padded with spaces by
the library if they have less than length required (i.e. "mikro.tx" ->
"mikro .tx "), so the user does not have to take care of that. The file
name and extension are case insensitive. The library will convert them
to proper case automatically, so the user does not have to take care of
that. Also, in order to keep backward compatibility with the first version
of this library, file names can be entered as UPPERCASE string of 11
bytes in length with no dot character between the file name and exten
sion (i.e. "MIKROELETXT" -> MIKROELE.TXT). In this case the last 3
characters of the string are considered to be file extension.
-
file_attr: file creation and attributs flags. Each bit corresponds to
the appropriate file attribut: