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 ?

[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;
}

[Turbo J]

Without looking at SD_card_write_string_in_file(), my guess is: Stack overflow.

Why didn't you post the function that actually fails?

[Woody Hung]

static void write_data_to_sd_card_and_determine_file(	uint8_t *data_array,
																											uint16_t data_array_index)
{
	bool file_size_determine;

	file_size_determine = SD_card_for_file_size(data_array_index, file_name, testcount);

	SD_card_write_string_in_file(data_array, data_array_index, file_name);
	
	testcount++;
}


void SD_card_write_string_in_file(uint8_t* string, size_t string_size, uint8_t* file_name_array)
{
	  static FIL file;

    uint32_t bytes_written;
    FRESULT ff_result;
	
		NRF_LOG_INFO("Writing to file %s ...", file_name_array);
		ff_result = f_open(&file, file_name_array, FA_READ | FA_WRITE | FA_OPEN_APPEND);
		if (ff_result != FR_OK)
		{
			    NRF_LOG_INFO("ff_result: %d .",ff_result);
				NRF_LOG_INFO("Unable to open or create file: %s .", file_name_array);
				return;
		}

		ff_result = f_write(&file, string, string_size, (UINT *) &bytes_written);
		if (ff_result != FR_OK)
		{
				NRF_LOG_INFO("Write failed\r\n.");
		} 
		else
		{
				NRF_LOG_INFO("%d bytes written.", bytes_written);
		}
		 (void) f_close(&file);
}

Error message :

I added line is 25.

[Turbo J]

Error stil is in code not shown. I'm out.

[haakonsh]

We need information that describes the problem, in detail.