SdFatFs Class

Description
Defines a class of SD FAT File system.

Syntax
class SdFatFs

Members

SdFatFs::begin

Description
Initialize SD FAT File System.

Syntax
int SdFatFs::begin(void);

Parameters
The function requires no input parameter.

Returns
Returns “0” if success, else returns a negative value.

Example Code
Example: create_folder; file_read_write; get_file_attribute; last_modified_time; list_root_files; time_lapse_photography.

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::end

Description
De-initialize SD FAT File System.

Syntax
int SdFatFs::end(void);

Parameters
The function requires no input parameter.

Returns
Returns “0” if success, else returns a negative value.

Example Code
Example: create_folder; file_read_write; get_file_attribute; last_modified_time; list_root_files.

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::*getRootPath

Description
Get the root path of the SD FAT File System. The logical volume character is starting from ‘0’, so the root path would like “0:/”.

Syntax
char *SdFatFs::getRootPath(void);

Parameters
The function requires no input parameter.

Returns
The function returns the root path.

Example Code
Example: create_folder; file_read_write; get_file_attribute; last_modified_time; list_root_files; time_lapse_photography.

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::readDir

Description
List items under a specific folder. List items under a specific folder and store the result in the buffer that user specified. Each item is separated by ‘\0’.

Syntax
int SdFatFs::readDir(char *path, char *result_buf, unsigned int bufsize);

Parameters
path: The absolute directory path to be listed.
result_buf: The buffer to be stored results.
bufsize: The size of result_buf. If results exceed this size, then the results larger than this size would be discarded.

Returns
Returns “0” if success, else returns a negative value.

Example Code
Example: get_file_attribute; list_root_files

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::mkdir

Description
Create folder.

Syntax
int SdFatFs::mkdir(char *absolute_path);

Parameters
absolute_path: The absolute directory path to be created

Returns
Returns “0” if success, else returns a negative value.

Example Code
Example: create_folder

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::rm

Description
Remove folder or file.

Syntax
int SdFatFs::rm(char *absolute_path);

Parameters
absolute_path: The absolute directory or file path to be deleted

Returns
Returns “0” if success, else returns a negative value.

Example Code
NA

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::isDir

Description
Check if a specific path is a directory.

Syntax
unsigned char SdFatFs::isDir(char *absolute_path);

Parameters
absolute_path: The absolute path to be queried

Returns
The function returns “1” if it is a directory, else returns “0”.

Example Code
Example: get_file_attribute

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::isFile

Description
Check if a specific path is a file.

Syntax
unsigned char SdFatFs::isFile(char *absolute_path);

Parameters
absolute_path: The absolute path to be queried

Returns
The function returns “1” if it is a directory, else returns “0”.

Example Code
Example: get_file_attribute

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::getLastModTime

Description
Get the last modified time for a file or directory.

Syntax
int SdFatFs::getLastModTime(char *absolute_path, uint16_t *year, uint16_t *month, uint16_t *date, uint16_t *hour, uint16_t *minute, uint16_t *second);

Parameters
absolute_path: The absolute path to be queried.
year: The value of the year.
month: The value of the month.
date: The value of the date.
hour: The value of an hour.
minute: The value of a minute.
second: field “second” contains no valid information in the current version.

Returns
The function returns “0” if success, otherwise returns a negative value for failure.

Example Code
Example: last_modified_time

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::setLastModTime

Description
Set the last modified time for a file or directory. Ameba doesn’t have built-in RTC. So we manually change file/directory last modified time.

Syntax
int SdFatFs::setLastModTime(char *absolute_path, uint16_t year, uint16_t month, uint16_t date, uint16_t hour, uint16_t minute, uint16_t second);

Parameters
absolute_path: The absolute path to be queried.
year: The value of the year.
month: The value of the month.
date: The value of the date.
hour: The value of an hour.
minute: The value of a minute.
second: field “second” contains no valid information in the current version.

Returns
The function returns “0” if success, otherwise returns a negative value for failure.

Example Code
Example: last_modified_time

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::open

Description
Open a file.

Syntax
SdFatFile SdFatFs::open(char *absolute_path);

Parameters
absolute_path: The path to a file.

Returns
The file object is an instance of SdFatFile.

Example Code
Example: create_folder; file_read_write; get_file_attribute; last_modified_time; list_root_files; time_lapse_photography

Notes and Warnings
Include “SdFatFs.h” to use the class function.
 

SdFatFs::status

Description
Return the current status of SD.

Syntax
int SdFatFs::status(void);

Parameters
The function requires no input parameter.

Returns
Function returns “1” if ready to use, else return “0” if the status is inactivating or abnormal.

Example Code
Example: time_lapse_photography

Notes and Warnings
Include “SdFatFs.h” to use the class function.