FS AT Command Set
AT+FSMOUNT: Mount and unmount file system
AT+FS: File system operation
AT+FSMOUNT: Mount and unmount file system
Set Command
Command:
AT+FSMOUNT=<mount>
Response:
OK
Parameter
<mount>:
0: Unmount FS file system
1: Mount FS file system
Explanation
After completing the file system operations wit AT+FS , it is recommended to use the AT+FSMOUNT=0 command to unmount the file system to free up a large amount of RAM space.
Example
// Manually unmount the file system
AT+FSMOUNT=0
// Manually mount the file system
AT+FSMOUNT=1
AT+FS: File system operations
Set Command
Command:
AT+FS=<type>,<operation>,<filename>,<offset>,<length>
Response:
OK
Parameter
<type>: Currently only FATFS is supported
0: FATFS
<operation>:
0: Delete file
1: Write file
2: Read file
3: Query file size
4: List files in the directory, currently only supports the root directory “/”
<offset>: Offset address, set only for read/write operations
<length>: Length, set only for read/write operations
Explanation
This command will automatically mount the file system. After completing the file system operations with AT+FS , it is recommended to use the AT+FSMOUNT=0 command to unmount the file system to free up a large amount of RAM space.
If the length of the data to be read is greater than the actual file size, only the actual length of the data will be returned.
When
<operator>iswrite, the system will return>``after receiving this command. At this point, you can input the data to be written, and the data length should be consistent with ``<length>.
Example
// Delete a file
AT+FS=0,0,"filename"
// Write 10 bytes at offset 100 in a file
AT+FS=0,1,"filename",100,10
// Read 100 bytes from offset 0 in a file
AT+FS=0,2,"filename",0,100
// Query the size of a file
AT+FS=0,3,"filename"
// List all files in the root directory
AT+FS=0,4,"."