SDIO + FAT16/FAT32

mikewilliamson9 · ‎2009-09-05

Posted on September 06, 2009 at 03:51

SDIO + FAT16/FAT32

#microsoft:-broken-for-sure

relaxe · ‎2011-05-17

Posted on May 17, 2011 at 12:54

This topic is named : ''SDIO + FAT16/FAT32'', and I would like people to respect this simple fact. Please, people who implement a FAT lib over =SPI=, stop hijacking this topic.

Now, if you just wonder what the heck I'm talking about:

Most SD cards out there are mandated to respect compatibility with the SPI port. Most of the projects out there use the SPI port to acess SD Cards. The high-density line of STM32 have a SDIO port, wich is faster but different to implement. This topic is about interfacing a FAT library over that specific port: SDIO.

Thanks,

-Relaxe

lmullane2 · ‎2011-05-17

Posted on May 17, 2011 at 12:54

Hi,

I have downloaded and compiled the SDIO_DosFS_V02.zip project that relaxe

was working on. Must say well done to Relaxe on that , its the only SDIO FAT example I have found so far. It compiles and works ok for me.

I can read and write files to my SDCard.

My only problem with it is that its slow to write out 1Meg of data.

Takes about 50 seconds. Its a lot quicker to read. Am I doing something wrong or is there another example where a write of 1Meg would be quicker.

thanks

Liam.

[ This message was edited by: lmullane on 08-06-2009 15:44 ]

dan10 · ‎2011-05-17

Posted on May 17, 2011 at 12:54

http://fullfat-fs.co.uk/ try this, its open source, and I've had excellent performance with this.

domen2 · ‎2011-05-17

Posted on May 17, 2011 at 12:54

Maybe you should also try different cards.

I had write 12x slower than read on an old 16 MB card, but only 2x slower than read on 256 MB card.

(My setup is not really related - SPI mode, efsl, but the conclusion might be valid)

fu0653 · ‎2011-05-17

Posted on May 17, 2011 at 12:54

Hi,relaxe.

I used your SDIO_DosFS_V01 code,

before I used Transcend 1G SD card is OK,

but now i used Transcend 2G SD card fail,

I entered the Debug model to see

my errorstatus is 0x2A,

always error in

while (!(status & (SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CMDREND | SDIO_FLAG_CTIMEOUT)))

{

status = SDIO->STA;

}

I have no idea to resolve this problem,

Will give me some tips to resolve this problem do?

I would like to know how to solve the problem,

Please discuss with me.

Thank you very much!!

it is my Email: fu0653@gmail.com

or MSN: fu0653@yahoo.com.tw

thanks!!

[ This message was edited by: fu0653 on 06-09-2009 07:28 ]

[ This message was edited by: fu0653 on 06-09-2009 08:38 ]

[ This message was edited by: fu0653 on 06-09-2009 08:46 ]

ari23 · ‎2011-05-17

Posted on May 17, 2011 at 12:54

Hi Afinko,

Thanks for this post, I think this helps indeed. I noticed from the source code that you are using the SDIO in 1-bit mode. Wouldn't the performance be improved if you you switch to 4-bit mode instead?

afinko · ‎2011-05-17

Posted on May 17, 2011 at 12:54

I successfully implemented

http://elm-chan.org/fsw/ff/00index_e.html

system on

http://www.st.com/mcu/modules.php?name=mcu&file=devicedocsmdt&FAM=110&DEV=STM3210E-EVAL

on SD card connected through the SDIO port (not SPI). The whole project is attached. I am using KEIL uVision and ULINK2 debugger. The original DEMO code from STM3210E-EVAL board was used, just the sd_FAT(); is called from sd_FAT.c before the menu is started. In this routine the file ''srcfile_aaaaa_bbb.dat'' is opened from SDcard and copied to the file ''dstfile.dat''. The source file is copied in 512 bytes block in RAM and written to the destination file in a cycle, until the whole file is copied.

The FatFS is ported in diskio.c, reading and writing in supported, the f_mkfs for making file system was not implemented yet (was not required yet, the SD card is much easily formated in any PC).

In sd_FAT.c are commented the routines for speed tests for reading and writing. I obtained these results:

1) 128 MB micro SD card that was included with eval board:

Read 1MB file - 830kB/s

Write 1MB file - 133kB/s

2) 4GB micro SDHC card from my mobile phone:

Read 1MB file - 1MB/s

Write 1MB file - 325kB/s

The speeds here are a bit better that I obtained by reading/writing files through the MassStorage USB mode.

The Stack size was resized from 0x000000400 (that is used in original DEMO code) to the 0x00004000 in startup_stm32f10x_hd.s. Otherwise the HardFault error occur.

The memory usage can be seen in /List/BOOT_FLASH.map (at the end of file).

Hope it will help to someone.

Afi

leszek2 · ‎2011-05-17

Posted on May 17, 2011 at 12:55

Sometimes its easier to use less pin numbers of uC. Not everytime you need to achive high speed transfers.

kakerlakenkoenig · ‎2011-05-17

Posted on May 17, 2011 at 12:55

Hey Relaxe, could you please attach the files of your Project? This would be very nice!! I cant find your attached file :\

soenke · ‎2011-05-17

Posted on May 17, 2011 at 12:55

Hi. I would also like to see the source code.

Thanks in advance.

Soenke