fatfs sample: file close error (-5)

[Rocio Cabral]

Hi, I'm running the fatfs sample using an Actinius Icarus board (nrf9160) and a microSD card, connected via SPI. The original sample works as it should (it mounts and opens the SD card and then lists the files on it), but when adding some lines to write a file, I'm having the following issue:

• If the string I'm trying to write has more than 11 characters, it writes well but then I get the message: "<err> fs: file close error (-5)". When opening the file on the SD card using a USB reader, sometimes I can see the file with the string I wrote, but sometimes It has different characters. I already tried to synchronize the file first using fs_sync() and it returned "file sync error (-5)". I also checked this ticket: https://devzone.nordicsemi.com/f/nordic-q-a/92166/fs-file-write-error--5  but deleting the line does not solve my issue, since it doesn't print the error message but the writing still fails.
• If the string I'm trying to write has less than 11 characters, the system starts rebooting repeatedly and never writes anything.

This is the .overlay I'm using:

&spi3{

    status = "okay";

    cs-gpios = <&gpio0 03 GPIO_ACTIVE_LOW>;

    sdhc0: sdhc@0 {

        compatible = "zephyr,sdhc-spi-slot";

        reg = <0>;

        status = "okay";

        label = "SDHC0";

       mmc {

            compatible = "zephyr,sdmmc-disk";

            status = "okay";

        };

        spi-max-frequency = <24000000>;

    };

};

This is the additional .config file I added (I'm aware that some of these lines might be unnecessary since they seem to be repeated):

CONFIG_SPI=y

CONFIG_GPIO=y

CONFIG_DISK_ACCESS=y

CONFIG_DISK_DRIVER_SDMMC=y

CONFIG_DISK_DRIVERS=y

CONFIG_FS_FATFS_EXFAT=y

CONFIG_SDHC=y

CONFIG_LOG=y

CONFIG_FILE_SYSTEM=y

CONFIG_FAT_FILESYSTEM_ELM=y

CONFIG_PRINTK=y

CONFIG_MAIN_STACK_SIZE=4096

CONFIG_SPI_NRFX_RAM_BUFFER_SIZE=8

And these are the lines I added to main.c:

struct fs_file_t file;

int err;

char data[] = "aaaaaaaaaaaa";                          //This is the string whose length determines how the system works

err = fs_open(&file, "/SD:/test.txt",FS_O_WRITE | FS_O_CREATE);

if (err) {

    printk("Error al abrir el archivo: %d\n" ,err);

}

err = fs_write(&file, data, sizeof(data));

if (err < 0) {

    printk("Error al escribir en el archivo: %d\n", err);

}

printk("Escrito correctamente %d bytes.\n", err);

err = fs_close(&file);

I'm working with SDK version 2.1.0.

Thanks in advance,

Rocío

[Hung Bui]

Hi Rocio, 
Sorry for the late reply. I haven't managed to figure out anything further. The challenge here is that we don't have the same board as yours and I was looking for a SD card reader board but haven't got one. 

My suggestion, if you still have the issue, is to try step in the code and see why file close return error -5 (IO error). 
When  you test with nRF52840 did you test with a SD Card ? 
If you did , you can use a logic analyzer and try to compare the signal out from the nRF52 and the signal out from the nRF91 to see why there is a difference. 

[user_jp]

Hi
I'm using the SDK v2.7.0 with a nRF5340 and I get exactly the same errors as Rocio. Did someone find a solution?
Thank you in advance.

[eb12345]

I can confirm the same thing. I'm using SDK v2.7.0.

[eb12345]

Just checked and it has been fixed in SDK v2.8.0

[user_jp]

Thank you very much for the information. Now it's working.