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eskimobob
Joined: 07 Feb 2009
Posts: 40
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| SD card not working on CCS Dev board |
 Posted: Sat Feb 14, 2009 5:00 pm |
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I am experimenting with the CCS 3.3V Embedded Ethernet dev board and everything was going fine until I tried out the Webserver2 example which uses an SD card for HTML page storage.
I have tried the HEX file that was supplied with the examples and also tried compiling myself but neither work. When I debug the code, I find that there is some problem with the SD multimedia card access. The code calls "fat_init();" which is in fat_pic.c:
Snippet from fat_pic.c
| Code: |
if(mmc_init() != MMC_EC_OK)
return EOF;
// start filling up variables
ec += mmc_read_block(11, 2, &Bytes_Per_Sector);
ec += mmc_read_block(13, 1, &Sectors_Per_Cluster);
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It initialises fine and then it reads Bytes_Per_sector which returns code MMC_EC_OK (0x00) which is fine.
When it tries to read Sectors_Per_Cluster, it returns MMC_EC_SET_READ_BLOCKSIZE_FAIL (0x04) which is bad.
I've tried two SD cards (32MB and 64MB, both freshly formatted on WinXP to FAT).
Any suggestions gratefully received  |
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eskimobob
Joined: 07 Feb 2009
Posts: 40
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| Posted: Thu Feb 19, 2009 2:00 pm |
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I've managed to make some limited progress on this:
1) MMC cards do not work with the TCP-IP examples, only SD cards! I have not found any mention of this in the examples although the excercise book says "for use with a SD card". It would be useful if CCS clearly stated that the examples do not work with MMC cards if that is the case.
2) SD cards formatted to FAT16 on WindowsXP or Windows Vista do not work.
3) SD cards formatted using the CCS code (compiled with #define FAT16) do not work.
4) SD cards formatted using the CCS code (compiled with #define FAT32) DO work.
It does not seem possible on Windows XP or Vista to format an SD card as FAT32 if it has previously been formatted as FAT16 therefore the only way to get this working is to write a test program which uses the FAT_pic.c and FAT_spi.c code to format an SD card as FAT32.
Once formatted as FAT32, the SD card can be accessed in Windows so Windows can be used to copy the required files to the card.
It ought to be possible to FTP the files to the card while it is in the dev board since the Webserver2 example includes FTP capability however I have tried this and it appears that there must be a bug in either the FTP or FAT code because the file that is created on the card is corrupt when viewed on a Windows machine - the FTPed file cannot be read by Windows.
Since the Webserver2 example can happily read files from the card using FAT, it would seem likely that the bug will be in the FTP code but I have not investigated further yet.
I usually find the CCS examples to be very good but because of the number of bugs I am finding, I am starting to feel a bit like a Guinea Pig with the TCP-IP examples and stack  |
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Guest
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| Posted: Fri Feb 20, 2009 8:33 am |
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I had this from CCS when i emailed about bugs in the Ethernet board examples.
| Quote: | | we are aware that the SMTP driver has a few flaws. We are in the middle up updating the TCP/IP stack and drivers, we may have something in a week or two. In that time please e-mail me again and see what are status is. |
Fair enough, except this was June 2008, all follow up emails about it were never replied to and there have been no updates either.
Jim |
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eskimobob
Joined: 07 Feb 2009
Posts: 40
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| Posted: Fri Feb 20, 2009 8:40 am |
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| Anonymous wrote: | | Fair enough, except this was June 2008, all follow up emails about it were never replied to and there have been no updates either. |
Hi Jim,
That's not good to hear  - but at least I am not alone 
Have you had any experience with the Microchip Stack? |
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asmallri
Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia
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| Posted: Fri Feb 20, 2009 6:42 pm |
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| eskimobob wrote: | | It does not seem possible on Windows XP or Vista to format an SD card as FAT32 if it has previously been formatted as FAT16 ... |
e
This is not correct. XP and Vista will happily format a FAT16 card to FAT32 and visa versa. I do this all the time when testing my software. What you are more likely seeing is the driver you are using is not correctly interpreting the boot sector information and as a consequence operates on the wrong area of the card. This would give the impression of operating correctly from the cards perspective, creating and writing files, but the PC would not be able to find the files.
You might like to check out my drivers - they work with MMC, SD, and SDHC cards.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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eskimobob
Joined: 07 Feb 2009
Posts: 40
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| Posted: Sat Feb 21, 2009 2:03 am |
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| asmallri wrote: | | This is not correct. XP and Vista will happily format a FAT16 card to FAT32 and visa versa. I do this all the time when testing my software. |
Hi Andrew,
Can you clarify your comment for me. Do you mean the driver I am using on the PC is a problem or the SD card driver on the PIC (which is the CCS driver) is a problem?
If I take a MMC or SD card and put it in my USB connected card reader attached to my WinXP laptop, I can read and write files to the card however when I try to format it, I do not get the FAT32 option - see screenshot image below:
You can see there is no FAT32 option in the combo-box. Is there a way I can force WinXP to allow me to format this card as FAT32?
If I put a card in my card reader which is already formatted to FAT32, WinXP will happily let me reformat to FAT32 or FAT16 (both FAT32 and FAT then appear in the combo-box). |
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asmallri
Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia
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| Posted: Sat Feb 21, 2009 8:03 am |
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You are only using a card with 30MB capacity. This is why Windows is not you the option to format it to FAT32.
FAT32 should be a last resort - it performs much slower than FAT16 on a PIC.
The driver bug I am referring to is one in your PIC driver software.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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eskimobob
Joined: 07 Feb 2009
Posts: 40
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| Posted: Sat Feb 21, 2009 8:35 am |
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| asmallri wrote: | You are only using a card with 30MB capacity. This is why Windows is not you the option to format it to FAT32.
FAT32 should be a last resort - it performs much slower than FAT16 on a PIC.
The driver bug I am referring to is one in your PIC driver software. |
Ah, got it now - should have realised 
I will see if I can get the CCS FAT16 code working.
Thanks  |
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Jovem
Guest
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| fat+webserver2 |
| Posted: Sun Jun 07, 2009 9:08 am |
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hi
I have the example of Webserver2 working only a SD 128 MB, now I want switch the card but don't work.
I have formatted (XP and Vista) in FAT32 and the sector at 512 or 1024 and don't.
Someone have an idea what can be? |
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