SDCARD problems

[rufinopc@rufinogg.com]

I am using an 8GB SD card, but I also try a 2GB one and the same thing happens.
I am using the original versions of CCS version 5.109 (fat.c and mmscd.c)
So which versions of these libraries can I use to be sure they work? because after trying several files modified by other users, I decided to use the original versions since they all gave many errors in the compilation.

[Ttelmah]

No. The full version is there in the first post in the code library. You will need
your modified DsPIC init. The links are showing the threads where the code
was derived from. You don't have to worry about these, except to see how
the changes evolved and were found.
The question on the 2GB card is how it was formatted?. Cards can be
formatted using GPT or MBR, and FAT16 or FAT32. for reliable operation,
with the standard driver, it needs to be MBR FAT16.
If your machine supports UEFI boot, then by default it'll select GPT.

[rufinopc@rufinogg.com]

In both cases they are formatted from windows 10 with the own windows 10 application in FAT 32 format.

[Ttelmah]

Almost certainly using GPT though, not MBR. If you look through the
links, you will see that this causes problems for the standard driver.
Basically 'where' things are is offset into a sub partition, instead of just
being at a fixed location in the card. The original driver does not handle
this, since historically all SD's were formatted MBR, until the mid 2010's,
and still have to be for many devices like cameras.

[rufinopc@rufinogg.com]

Are they formatted as GPT, there is no way that they can be used in CCS?
I have tried to change the format with "DISKPART" and it does not allow me to change it because it considers SD as CDROM or DVD
I also can't find any formatters that still have that option, although this would be anchronistic; It's like putting wooden wheels on a car.
I am lost in a sea of doubts and problems. Isn't there anyone who has faced such a seemingly basic problem like saving and recovering files on an SD? because Microchip apparently has it solved in the MPLAB X and not to mention the Arduinos using the microchip, already owned by Microchip.
Any idea to solve the problem? Thank you for the time you are giving me

[temtronic]

while I don't use them...perhaps you can get the 'driver' source codes for the other micros and then compare what they do differently than CCS ??
does Olimex have drivers or ask on their 'forum' ??

[Ttelmah]

The code in the code library handles this OK.

[rufinopc@rufinogg.com]

Microchip has examples for 32-bit micros and some examples for PIC24s. Could it be that I have to throw in the towel and work with the MPLABx? Because between adapting the examples to CCS and working with MPLABx I think the latter is easier, but I prefer to continue with CCS...

[asmallri]

Disclaimer: I have not studied the code you are using.

Two points that may help you, I would not get hung up to much on the 400K initialization speed. I regularly test new hardware designs with initialisation speeds of 1MHz or higher. However the pullup on DO of the card is mandatory. The card will intermittently fail to initialise correctly without it.

Try setting the SPI high speed to 8MHz
_________________
Regards, Andrew

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

[rufinopc@rufinogg.com]

Thanks asmallri
I have configured the SPI with 8MHz, but nothing is achieved and it is not a card problem; Fortunately I have found the MiniTool Partition Wizard application that allows us to see if the SD is MBR and "YES" it is, so we can now rule out this problem and focus on what is happening.
The truth is that I have been using CCS since its first version (years ago) and I have never had a problem like this, of course it is due to my ignorance about SD memories.
I can't believe that these problems are not solved by CCS technicians since SD memories have not just fallen from the sky. There is not a single example of the Atmel Mega that does not work with SD and they are real toys compared to CCS

[asmallri]

Try this. Format the SD card using a Camera. If not then goto sdcard.org (the organisation that defines SD card standards) and download their SD card format utility and use it to format the card. Why? Some format functions initialise existing data structures on the media, so a problem with the structure is not fixed with formatting the media. Whereas the application from SDcard.org creates the data structures from scratch.
_________________
Regards, Andrew

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

[rufinopc@rufinogg.com]

I just formatted it with version 5.02 and it doesn't work either. There is always streaming data at initialization. Data also flows to the first "dir" through the I/Os, although it never appears in the output of the terminal since what it shows is as if the card had nothing, when, in fact, it has two files. With a second "dir" there is no data flow or SD enable pulses, but the terminal always shows an answer as an empty card...

[Ttelmah]

A a comment (he is being very careful not to advertise here), but Andrew
above has fully working PIC24 SD drivers. Go to the Brush Electronics site.
His drivers are much more reliable and adjusted compared to the CCS
ones. If you want a solution that works, pay for these.

[Ttelmah]

And (of course), what syntax are you using to call the read directory
command?. You do realise it needs "/" to read the top directory?. Calling
with a blank name, will return nothing.

[rufinopc@rufinogg.com]

Thanks for the notice about dir. I always refer to "dir", but the tests are always give the same results:
/> dir
--/--
/> dir
-----------------------
/> dir /
--/--
/>
-------------------------------------------------- --
/> dir/
Unknown Command 'dir/'
/>
It is observed that the command interpreter works well