USB Mass Storage Sample Application and external SPI flash memory device

Question

Hello,

I want to run mass storage on my custom board with the nRF52833 and W25Q512JVEIQ. I have reviewed the mass storage sample (ncs\v2.7.0\zephyr\samples\subsys\usb\mass).

I have previously communicated with the W25Q512JVEIQ via SPI and written my own test functions (write_enable, erase_sector, send_page_program, read_data). I can successfully write and erase data on the W25Q512JVEIQ.

The relevant configurations in my custom_board.dts are as follows:

&flash0 {
	partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;

		boot_partition: partition@0 {
			label = "mcuboot";
			reg = <0x0 0xc000>;
		};
		slot0_partition: partition@c000 {
			label = "image-0";
			reg = <0xc000 0x32000>;
		};
		slot1_partition: partition@3e000 {
			label = "image-1";
			reg = <0x3e000 0x32000>;
		};
		scratch_partition: partition@70000 {
			label = "image-scratch";
			reg = <0x70000 0xa000>;
		};
		storage_partition: partition@7a000 {
			label = "storage";
			reg = <0x7a000 0x6000>;
		};
	};
};
spi_flash: &spi1 {
	status = "okay";
	pinctrl-0 = <&spi1_default>;
	pinctrl-names = "default";
	flash@0 {  /* Flash belleğin tanımlanması */
        compatible = "jedec,spi-nor";  /* SPI NOR flash belleği uyumluluğu */
        reg = <0>;  /* SPI cihazı için chip select (CS) numarası */
        spi-max-frequency = <8000000>;  /* Maksimum 8 MHz SPI frekansı */
        label = "W25Q512JV";
        jedec-id = [ef 40 20];  /* W25Q512JV'nin JEDEC ID değeri */
        size = <0x4000000>;     /* Flash boyutu (64 MB, 512 Mb) */
    };
};

&pinctrl {

	spi1_default: spi1_default {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 1)>,
					<NRF_PSEL(SPIM_MISO, 0, 4)>,
					<NRF_PSEL(SPIM_MOSI, 0, 5)>;
		};
	};
};

zephyr_udc0: &usbd {
	compatible = "nordic,nrf-usbd";
	status = "okay";
};

Then, I added the following functions from the mass storage sample to my code without changing them:

static int setup_flash(struct fs_mount_t *mnt)
static int mount_app_fs(struct fs_mount_t *mnt)
static void setup_disk(void)

Then, I implemented it in the main as in the mass storage sample:

int main(void)

{

int retu;

setup_disk();

retu = usb_enable(NULL);

if (retu != 0)

{

printk("\n");

}

I built the project without errors. Then, I debugged it to see how it works. I noticed that the "mount_app_fs(mp)" function is returning -5. I think something is wrong. Could you help me with this? Since I am new to the NCS environment, I might have made some simple mistakes. Please consider that as well.

USB Mass Storage Sample Application and external SPI flash memory device

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