CCS MMCSD & FAT32 Drivers on SD - Working for anyone?

[Guest]

I only want to hear from people with success using the included ex_fat.c with the mmcsd.c and fat.c (in FAT32 mode).

It's not working for me.

Thanks,

-Ben

[bkamen]

Gah! I thought I was logged in and it let me post.

Funky. -- anyway - let me know.

I forgot to add, I'm using CCS latest version under MPLAB 8.10 w/HPC Explorer and PICtail. (yes, I've already matched up the right #defines for the SPI lines and nCS as well as disconnected the LM74 temp sensor and it's pullup resistors on the HPC PCB)

I've been doing this with SanDisk 512MB, 1G cards.

I've had to make all sorts of additions to get even a heartbeat.. (like a correct init procedure)

The straight stock code inits, and directories don't lock up... but anything else
starts and then freezes the PIC.

I've been able to at least make it not freeze, but nothing works (init_fat and print_CID and print_CSD are sporadic at best)


Thanks,

-Ben

[asmallri]

[bkamen]

Thanks for the reply.

This is a Rev. 1 PCB --- but has the VHCT125A on it - so I'm going to assume that's my culprit for all this whackiness.

I had a logic analyzer hooked to the system and it looked ok - but wow.

I'll change this out and see what the results are...

Thanks a ton,

-Ben

[bkamen]

I'm back.

I ordered the very parts Andrew recommended and am still where I was before.

Out of the box, the CCS drivers don't see to do anything but not work.

With reading the SD Card SPEC myself, I'm already seeing spots where the CCS drivers just didn't "follow directions".

I've had more success with pieces of code I've had to write. Oh well.

Thanks for the Help Andrew,

-Ben

p.s. If anyone has had luck with these drivers "out of the box", please feel free to share. Also, let us know which cards you were using in your testing.

[asmallri]

You could always buy my FAT implementation for CCS. It works out the box :-)
_________________
Regards, Andrew

http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!

[bkamen]

I was helping a friend on this - so my recommendation is going to be for him to do just that.

I know the examples CCS includes are pretty much as-is, but this one should be marked with, "really really may not work in most situations - so beware."

It seems to be really that far off the mark.

By the way - on the PICtail - what kind of corruption did you end up seeing?

I'm guessing something like a data line was late in toggling behind the clock and that corrupted the data. So far, I haven't really seen anything like that (using my Agilent MSO6054a w/SPI decode).. but as a test, I even ran the SPI bus at like 200KHz (paced off timer2)

Between the old VHCT125's and these, the behavior has been pretty same.

-Ben

[newguy]

[olaf]

... finally after about 10 hours of testing my code works with mmcsd.c and fat.c.

I'm using 1gb sd card and I think I found out why some cards work and some don't.

At first: #define MMCSD_MAX_BLOCK_SIZE 512 <- needed for sd cards

Second: if you format your sd card windows sometimes creates the file system start anywhere - don't know why but happened to me,
the pic couldn't find the file system because of this.

Best way is to use winhex and to do a physical read to check if file system starts at 0x00.

now read and write works for me

[ShellTox]

Hello

olaf can you post an example on how you initialize the card? And how you read and write a file on the card?


Thank you

[AleksBak]

[andreluizeng]

I already posted a code on another topic.

http://www.ccsinfo.com/forum/viewtopic.php?t=37463&highlight=mmc

mmc + fat32 working on 18F

regards.
_________________
Andre

[fredp]

[andreluizeng]

Hi fredp,

contact me by email,

regards,

Andre
_________________
Andre

[asmallri]