MSP430F5659: FATFs problem: FR_INVALID_OBJECT retuned by validate function

Good morning Tomasz & Peter,

First of all thank you for your replies at my queston.

Ok, I understand that there are differences between the 2 formats mentioned in the first post, FAT32 and FATFS.

As I said before I'm using the FatFs library by TI in my project and I try to format again my SDHC card but the only 3 available choices I have are:

• FAT32
• exFAT
• NTFS

So, I think I have to change something in the code I included, don't I?

In this case what are the main important changes I have to make so that I can finally read my .txt file from my SDHC card?

I'd really appreciate some advice and help to understand how to fix this issue in the best way as soon as possible.

Best Regards,

Maria Angela

Good morning,

So, if I understand correctely what you wrote in the previous posts:

if I want to format my 8 GB SDHC card using FAT32 (as it is by default) this is not possible because this format isn't support by TI's FATfs library, right?

2. Is there an application note or something I could study to understand how to move on with my project using FAT32 format with my SDHC card interfaced via SPI with my uP?

3. I see a lot of posts on TI E2E community related to FAT32 formatting in SD cards interfaced via SPI with TI processors, but nothing like a sort of guide in order to explain what format are supported by TI 's FATfs library. I think it could be really useful for many developers and engineers like me have a starting point like that for our work projects.

Waiting for your answers,

Thank you for your help in advance,

Best Regards,

Maria Angela

Goodmorning Tomasz,

Thank you for your clear reply.

This morning I tried to format my SDHC card in exFAT 512 byte format. Then I saved my .txt file on it and now I'm triying to read it.

I execute the same functions I write in the first post related to this issue.

Among the other things the f_open function calls check_mounted function and store its result in the variable res; in my case res=FR_NO_FILESYSTEM

res = chk_mounted(&path, &dj.fs, (uint8_t)(mode & ~FA_READ));

In chk_mounted function I have:

 /* Search FAT partition on the drive. Supports only generic partitionings, FDISK and SFD. */
    fmt = check_fs(fs, bsect = 0);                                      /* Check sector 0 if it is a VBR */
    if (fmt == 1){                                          /*
                                                             * Not an FAT-VBR, the disk may be partitioned
                                                             * Check the partition listed in top of the partition table
                                                             */
        tbl = &fs->win[MBR_Table + LD2PT(vol) * 16];                    /* Partition table */
        if (tbl[4]){                                                    /* Is the partition existing? */
            bsect = LD_DWORD(&tbl[8]);                                  /* Partition offset in LBA */
            fmt = check_fs(fs, bsect);                                  /* Check the partition */
        }
    }
    if (fmt == 3){
        return ( FR_DISK_ERR) ;
    }
    if (fmt){
        return ( FR_NO_FILESYSTEM) ;                                    /* No FAT volume is found */
    }

What's wrong now? Is it possible that the root of the problem is my 8GB SDHC card? Is it too much big?

Thanks in advance for your help,

Best regards,

Maria Angela

Good morning Tomasz,

not yet but I'm going to try it today.

However yesterday I was able to read my .txt file stored in another 2 GB SD card simply changing the base time of my project.

Today I'm also going to have some experiments on different dimensions and classes' SD cards to verify if the routine I wrote is robust or not.

Thank you very much for your help and for your clear explanation.

Best Regards,

Maria Angela