FatFs question

[Woody Hung]

I used nRF5_SDK_14.1.0_1dda907.

I used fatfs example.

Wirted data in the same file to sd card.

I discoverd that Max size of the file is 16KB.

Over the max size of file, when i write data to sd card, will be failure.

Can i change the max size to one file, or no limit size ?

[haakonsh]

Hey Woody,

Over the max size of file, when i write data to sd card, will be failure.

I need the trace info. 

Cheers,

Håkon.

[Turbo J]

Unusual, as the common cluster size of multi-GB-sized SD(HC) cards is 32KB. Did you try different cards?

[Woody Hung]

I used 8GB sd card.

If there are two file in the sd card.

The one is 16KB.

Another is 14 KB.

If i write data to 14KB file, will be successful.

If i write data to 16KB file, will be failure.

[haakonsh]

I need to know how you have initialized the file system, do you have any code, tracelogs, or logs that you can share?

[Woody Hung]

I used the code init the fill system.

void fatfs_init(void)
{
    static FATFS fs;
    static DIR dir;
    static FILINFO fno;
    static FIL file;

    FRESULT ff_result;
    DSTATUS disk_state = STA_NOINIT;
		
		uint8_t string_start_init[] = "\r\nSD card init\r\n";
		uint8_t file_name1[] = "Ant00000.TXT";
		size_t	string_size;

    // Initialize FATFS disk I/O interface by providing the block device.
    static diskio_blkdev_t drives[] =
    {
            DISKIO_BLOCKDEV_CONFIG(NRF_BLOCKDEV_BASE_ADDR(m_block_dev_sdc, block_dev), NULL)
    };

    diskio_blockdev_register(drives, ARRAY_SIZE(drives));

    NRF_LOG_INFO("Initializing disk 0 (SDC)...");
    for (uint32_t retries = 3; retries && disk_state; --retries)
    {
        disk_state = disk_initialize(0);
    }
    if (disk_state)
    {
        NRF_LOG_INFO("Disk initialization failed.");
        return;
    }

    uint32_t blocks_per_mb = (1024uL * 1024uL) / m_block_dev_sdc.block_dev.p_ops->geometry(&m_block_dev_sdc.block_dev)->blk_size;
    uint32_t capacity = m_block_dev_sdc.block_dev.p_ops->geometry(&m_block_dev_sdc.block_dev)->blk_count / blocks_per_mb;
    NRF_LOG_INFO("Capacity: %d MB", capacity);

    NRF_LOG_INFO("Mounting volume...");
    ff_result = f_mount(&fs, "", 1);
    if (ff_result)
    {
        NRF_LOG_INFO("Mount failed.");
        return;
    }

	NRF_LOG_RAW_INFO("");

	string_size = sizeof(string_start_init) - 1;
	SD_card_write_string_in_file(string_start_init, string_size,  file_name1);
    return;
}