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4. SERIAL COMMUNICATION SUBSYSTEM
Command format:
Command [Filename] [Option] [Data] [CR] [LF]
In C:
printf(“fputs test.txt /w Hello World \r\n”);
In Arduino Development Environment:
serial.print(“fputs test.txt /w Hello World \r\n”);
Command
Brief Description
mode[Option][CR][LF]
Select mode of operation: /t terminal or /m MCU mode
init [CR][LF]
Initializes SD/MMC card
cd [Change Directory][CR][LF]
Change director
dir [CR][LF]
List directory
fsize [Filename][CR][LF]
Display file size
dsize[CR][LF]
Display SD/MMC disk space
ftime [Filename][CR][LF]
File creation and last modified time
md[Directory][CR][LF]
Make directory
rd[Directory][CR][LF]
Remove directory
del[Filename][CR][LF]
Delete file
fcreate[Filename][CR][LF]
Create a new file
rename[Source Filename][Destination Filename][CR][LF]
Rename the file
fopen[Filename][/Option][CR][LF]
Open the file: /r Read or /w Write or /a Append
fclose[CR][LF]
Close file
fputc[Filename][/Option][1 Byte Data][CR][LF]
Write a byte to file
fputs[Filename][/Option][String][CR][LF]
Write a string to file (limited 256 characters)
fwrite[/# of bytes to write][CR][LF]
Write up to 512 bytes to file
fgetc[/# of bytes to read][CR][LF]
Read up to 256 bytes from file
fgets[CR][LF]
Read one line of string
fread[Filename][CR][LF]
Read all data in file
reset[CR][LF]
Reset card
baud[Baud rate][CR][LF]
Set Baud rate
card[CR][LF]
Card status
Figure 4.9: SD/MMC commands.