hello all;
I am going to design a datalogger project and I need to save the data on a SD card in FAT16 or FAT32 format (so I can read the files in PC). has anyone any code or library for that purpose. Of course the micro must use SPI for communicating with the SD memory card. I am working with AT91sam7x256 and I am using Keil compiler.
Thanks in advance.

hello, for using fat library there is some free lib for using. but i'd edited one of them for IAR Embeded workbench but i think you can edit it for keil,
and for interfacing sd with at91sam7x256 you can use atmel example code.
it's for keil, iar and gnu.

here is the link:

http://www.atmel.com/dyn/resources/prod ... m7x-ek.zip

it's 40mb

good luck!

Thanks for your reply and for the example code that you mentioned;
I will try to edit the library for Keil and I will also try to use the example code and then I will inform everybody of the results.
Thanks

Hello.... I am a total starter at this.... I`m using AT91SAM7X-EK evaluation kin with SAM7X256 MCU. I have downloaded your code, but file processor.h file is missing ,it is requsted in mmc.c file.... what kind of library is that or where can i find it. It would be great if you could send me some example code, that would just create some file, write a few bytes... and close the file...

hi, in these project no processor.h needed, plz delete this header file from #include.

Hi... please help, I still can't get it to work, i get error on compilation that there are no definitions for diskio functions (getfattime, disk read etc...), please help (example code would be very helpful), I think I ran out of beginners luck

hello, there is one topic that i created it for other that help me to complete my program for correcting the erorrs, see it at this topic:

viewtopic.php?f=15&t=12756

Hi everyone
I used the Fat Library.It works Corectly but I have just one problem.f_write function doesn't work correctly and it doesn't return FR_OK.Can somebody help me?It creates new file and it read an existing file but it can't write to a file.this is my code:

#include "project.h"
#include "Demo.h"
#include "Font.h"
#include "t6963c.h"

#include "mmc.c"
#if TINY_FAT
#include "tff.c"
#else
#include "ff.c"
#endif



WORD mmc_ok=0,n;
char filename[20]="test.txt";
char str[512]="File Writing Is OK!!!!!!!!";
FATFS fat;
FIL file;
//***************************************************************
void InitDevice()
{
AT91C_BASE_RSTC->RSTC_RMR=0xA5000000 | AT91C_RSTC_URSTEN; //Enable External RESET
}
//***************************************************************

void main()
{
InitDevice();
LCD_Setup();
LCD_Init();
LCD_ClearText();
LCD_ClearGraph();

if(disk_initialize(0)!=STA_NOINIT)
{
//xmit_datablock(str, 0xFE)
LCD_Print(0,0,"MMC Init OK");
mmc_ok=1;
f_mount(0,&fat);
}
else
LCD_Print(10,7,"MMC Not Init");

if(mmc_ok)
{
if(f_open(&file,filename,FA_CREATE_ALWAYS | FA_WRITE)==FR_OK) //Create A New File
{
f_sync(&file);

if(f_write(&file,str,10,&n)==FR_OK) //Writin To Opened File
LCD_Print(0,3,"File Writing OK");
else
LCD_Print(0,3,"File Writing Error");

f_close(&file); //Close Opened File
if(f_open(&file,filename,FA_OPEN_EXISTING | FA_READ)==FR_OK)
LCD_Print(0,4,"File Open For Read OK");
else
LCD_Print(0,4,"File Open Error");
f_sync(&file);

str[0]='\0';
if(f_read(&file,str,50,&n)==FR_OK) //Reading From Opened File
{
LCD_Print(0,6,"File Readig OK");
str[50]='\0';
LCD_Print(0,8,str);
}
else
LCD_Print(0,6,"File Reading Error");
}
}
while(1)
{

}
}