View source for LPC1768: SD Card Interface ← LPC1768: SD Card Interface

[[category: LPC1768 Tutorials]]
=Objective:=
In this tutorial we will discuss how to interface SD CARD with lpc1768 to read and write the fat32 files.<br>
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=References=
Thanks Mr. C.C. Dharmani for the SD Card driver libararies.<br>
The original SD card library for AVR controllers can be downloaded from http://www.dharmanitech.com/.<br>
These libraries have been modified to provide the standard interfaces like File_Write/File_read and also supports multiple file access.<br>
Check the below links for fat32 basics:<br>
https://www.win.tue.nl/~aeb/linux/fs/fat/fat-1.html
<br>
http://www.tavi.co.uk/phobos/fat.html
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=Configuration=
The number of files to be handled simultaneously can be configured in fat32.h using the constant C_MaxFilesOpening_U8. <br>
To print the debug messages set FAT32_DEBUG_ENABLE to 1.<br>
<b>Note:</b>The file name should max 11-chars including the file type.
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=File Handling Functions=
The below table shows the list of functions to access the sd card.<br>
Refer fat32.c/fat32.h for more info.
{| class="table table-striped table-hover table-condensed table-bordered"
|-class="info"
!Function|| Description
|-
|FILE_Open||This functions opens the specified file in requested mode(READ/WRITE/APPEND).
|-class="active" 
|FILE_Close|| This functions closes the file and releases the memory used by the file.
|-
|FILE_Delete|| This functions deletes the file from SD card.
|-class="active" 
|FILE_GetCh|| This functions reads a byte of data from the file, Once the End of File is reached it returns EOF(26)
|-
|FILE_PutCh|| This functions writes a byte of data to the file, EOF(26) needs to be passed to mark the end of file and save it to SD card.
|-class="active"
|FILE_GetList|| This functions traverses through the SD card and lists the available files with their size.
|- 
|FILE_GetMemoryStatics|| This functions calculates the total and free memory of the SD card. It takes upto 10secs(for 32GB) to calculate the memory statics depending on the size of CARD
|}
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=Formatting SD Card=
As this Sd Crad library is for fat32, the card needs to be formatted using fat32 settings as shown below.
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[[File:Fat32Formatting.png]]

=Connection Diagram=

=code=
Below example shows the usage of all the fat32 functions.
<html>
<script src="https://gist.github.com/SaheblalBagwan/b1d8a48c52295019777591a7600ad596.js"></script>
</html>
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[[File:0SdCardInterface.gif]]