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Clock frequency Identification Mode
(the low freq. is required for Fod max 400kHz
MultiMediaCard compatibility).
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Clock frequency Data Transfer Mode Fpp max 25MHz
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* A - SD Card Initialization and configuration
* ============================================
* - To initialize the SD Card, use the SD_Init() function. It
* Initializes the SD Card and put it into StandBy State (Ready
* for data transfer). This function provide the following operations:
*
* 1 - Apply the SD Card initialization process at 400KHz and check
* the SD Card type (Standard Capacity or High Capacity). You
* can change or adapt this frequency by adjusting the
* "SDIO_INIT_CLK_DIV" define inside the stm32xx_eval.h file.
* The SD Card frequency (SDIO_CK) is computed as follows:
*
* +---------------------------------------------+
* | SDIO_CK = SDIOCLK / (SDIO_INIT_CLK_DIV + 2) |
* +---------------------------------------------+
*
* In initialization mode and according to the SD Card standard,
* make sure that the SDIO_CK frequency don't exceed 400KHz.
*
* 2 - Get the SD CID and CSD data. All these information are
* managed by the SDCardInfo structure. This structure provide
* also ready computed SD Card capacity and Block size.
*
* 3 - Configure the SD Card Data transfer frequency. By Default,
* the card transfer frequency is set to 24MHz. You can change
* or adapt this frequency by adjusting the "SDIO_TRANSFER_CLK_DIV"
* define inside the stm32xx_eval.h file.
* The SD Card frequency (SDIO_CK) is computed as follows:
*
* +---------------------------------------------+
* | SDIO_CK = SDIOCLK / (SDIO_INIT_CLK_DIV + 2) |
* +---------------------------------------------+
*
* In transfer mode and according to the SD Card standard,
* make sure that the SDIO_CK frequency don't exceed 25MHz
* and 50MHz in High-speed mode switch.
* To be able to use a frequency higher than 24MHz, you should
* use the SDIO peripheral in bypass mode. Refer to the
* corresponding reference manual for more details.

int main(void)
{
    FRESULT result;
    FATFS FATFS_Obj;

    result = f_mount(&FATFS_Obj, "0", 1);
    if (result != FR_OK)
    {
        //printf("Îøèáêà ìîíòèðîâàíèÿ äèñêà %d\r\n", result);
    }


    DIR dir;
    FILINFO fileInfo;
    int nFiles = 0;

    result = f_opendir(&dir, "/");
    if (result == FR_OK)
    {
        while (((result = f_readdir(&dir, &fileInfo)) == FR_OK) && fileInfo.fname[0])
        {
            nFiles++;
        }
    }
    f_closedir(&dir);


    FIL file;
    UINT nRead, nWritten;

    result = f_open(&file, "readme.txt", FA_OPEN_EXISTING | FA_READ);
    if (result == FR_OK)
    {
        f_read(&file, &buff, 1024, &nRead);
        f_close(&file);
    }

    result = f_open(&file, "write.txt", FA_CREATE_ALWAYS | FA_WRITE);
    if (result == FR_OK)
    {
        f_write(&file, &buff, nRead, &nWritten);
        f_close(&file);
    }

    while(1)
    {
    }
}