External SPI Flash Memory + File System + NRF 52832

[Prasad A]

Hi,

I am trying to implement a lightweight file system in my external flash memory (ISSI). After the implementation of file system, I want to store a .bin file and later access the file through c program. I am a beginner in nrf52 board and need some assistance in understanding the implementation method for the above.

1. I need some direction for implementing file system in nrf52832. I am using the following Software/Hardware tools:

• nRF52832
• NRF CONNECT SDK 2.5.1
• SPI FLash Memory: IS25LP128-JBLE
• vscode
• Windows 11 64 bits

       2. I would also like to if I can implement FATFS on the SPI flash memory using the nrf 52832. Is there a link for the lastest version of FAT FS code.

       3. I need some help in understanding if I can use supported files from nrf SDK v 2.5.1 for nrf52832 board? IS there some alteration needed before I upload them to my nrf 52832 board.

Best,

AP

[Shahin97]

Theses zephyr examples may be of some use to you - 

https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/fs

[Prasad A]

Will this work for nrf 52832 board?

As I have gone through the document and for external flash : "This type of configuration requires external flash device to be available on DK board. Currently following boards support the configuration: nrf52840dk_nrf52840 by nrf52840dk_nrf52840_qspi configuration." . SInce I have a nrf 52832dk board it does not support this board right?

[dejans]

Hi Prasad A ,

Regarding file systems, you could have a look at file_systems and samples.

Please let me know if you have any further questions.

Best regards,
Dejan

[Prasad A]

Hey dejans,

I was looking in the Links you provided, the ideal file to flash to an external spi flash memory seems to be :

samples/subsys/usb/mass/ : since its is an example of USB Mass Storage device that uses FAT FS driver with RAM or *SPI connected FLASH*, or LittleFS in flash, depending on the sample configuration.

But due to the defintion of USB I am currently using the "samples/subsys/fs/littlefs" and try to change the std, overlay and prj.conf. Therefore I need some help there.

I have a external SPI NOR FLASH (25lp128 from ISSI) connected to my nrf52dk_52832 development board kit.

The connection are:

• SPI_CE_PIN = P0.22 // chip enable
• SPI_MISO_PIN = P0.23 // SO
• SPI_MOSI_PIN = P0.24 // SI
• SPI_SCK_PIN = P0.25 //SCK
• SPI_HOLD_PIN = P0.11 //HOLD or RESET (not sure if it should be connected)
• SPI_WP_PIN = P0.12 // Write protect (not sure if it should be connected)

My nrf52dk_52832.dts is:

/dts-v1/;
#include <nordic/nrf52832_qfaa.dtsi>
#include "nrf52dk_nrf52832-pinctrl.dtsi"
#include <zephyr/dt-bindings/input/input-event-codes.h>

/ {
	model = "Nordic nRF52 DK NRF52832";
	compatible = "nordic,nrf52-dk-nrf52832";

	chosen {
		zephyr,console = &uart0;
		zephyr,shell-uart = &uart0;
		zephyr,uart-mcumgr = &uart0;
		zephyr,bt-mon-uart = &uart0;
		zephyr,bt-c2h-uart = &uart0;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
		zephyr,code-partition = &slot0_partition;
	};

	pwmleds {
		compatible = "pwm-leds";
		pwm_led0: pwm_led_0 {
			pwms = <&pwm0 0 PWM_MSEC(20) PWM_POLARITY_INVERTED>;
		};
	};

	arduino_header: connector {
		compatible = "arduino-header-r3";
		#gpio-cells = <2>;
		gpio-map-mask = <0xffffffff 0xffffffc0>;
		gpio-map-pass-thru = <0 0x3f>;
		gpio-map = <0 0 &gpio0 3 0>,	/* A0 */
			   <1 0 &gpio0 4 0>,	/* A1 */
			   <2 0 &gpio0 28 0>,	/* A2 */
			   <3 0 &gpio0 29 0>,	/* A3 */
			   <4 0 &gpio0 30 0>,	/* A4 */
			   <5 0 &gpio0 31 0>,	/* A5 */
			   <6 0 &gpio0 11 0>,	/* D0 */
			   <7 0 &gpio0 12 0>,	/* D1 */
			   <8 0 &gpio0 13 0>,	/* D2 */
			   <9 0 &gpio0 14 0>,	/* D3 */
			   <10 0 &gpio0 15 0>,	/* D4 */
			   <11 0 &gpio0 16 0>,	/* D5 */
			   <12 0 &gpio0 17 0>,	/* D6 */
			   <13 0 &gpio0 18 0>,	/* D7 */
			   <14 0 &gpio0 19 0>,	/* D8 */
			   <15 0 &gpio0 20 0>,	/* D9 */
			   <16 0 &gpio0 22 0>,	/* D10 */
			   <17 0 &gpio0 23 0>,	/* D11 */
			   <18 0 &gpio0 24 0>,	/* D12 */
			   <19 0 &gpio0 25 0>,	/* D13 */
			   <20 0 &gpio0 26 0>,	/* D14 */
			   <21 0 &gpio0 27 0>;	/* D15 */
	};

	arduino_adc: analog-connector {
		compatible = "arduino,uno-adc";
		#io-channel-cells = <1>;
		io-channel-map = <0 &adc 1>,	/* A0 = P0.3 = AIN1 */
				 <1 &adc 2>,	/* A1 = P0.4 = AIN2 */
				 <2 &adc 4>,	/* A2 = P0.28 = AIN4 */
				 <3 &adc 5>,	/* A3 = P0.29 = AIN5 */
				 <4 &adc 6>,	/* A4 = P0.30 = AIN6 */
				 <5 &adc 7>;	/* A5 = P0.31 = AIN7 */
	};

	/* These aliases are provided for compatibility with samples */
	aliases {

	};
};

&adc {
	status = "okay";
};

&uicr {
	gpio-as-nreset;
};

&gpiote {
	status = "okay";
};

&gpio0 {
	status = "okay";
};

arduino_serial: &uart0 {
	status = "okay";
	compatible = "nordic,nrf-uarte";
	current-speed = <115200>;
	pinctrl-0 = <&uart0_default>;
	pinctrl-1 = <&uart0_sleep>;
	pinctrl-names = "default", "sleep";
};

arduino_i2c: &i2c0 {
	compatible = "nordic,nrf-twi";
	status = "okay";
	pinctrl-0 = <&i2c0_default>;
	pinctrl-1 = <&i2c0_sleep>;
	pinctrl-names = "default", "sleep";
};


&spi0 {
	compatible = "nordic,nrf-spi";
	/* Cannot be used together with i2c0. */
	/* status = "okay"; */
	pinctrl-0 = <&spi0_default>;
	pinctrl-1 = <&spi0_sleep>;
	pinctrl-names = "default", "sleep";
};

&spi1 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	pinctrl-0 = <&spi1_default>;
	pinctrl-1 = <&spi1_sleep>;
	pinctrl-names = "default", "sleep";
};

arduino_spi: &spi2 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	cs-gpios = <&arduino_header 16 GPIO_ACTIVE_LOW>; /* D10 */
	pinctrl-0 = <&spi2_default>;
	pinctrl-1 = <&spi2_sleep>;
	pinctrl-names = "default", "sleep";
};

&flash0 {

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

		boot_partition: partition@0 {
			label = "mcuboot";
			reg = <0x00000000 0xc000>;
		};
		slot0_partition: partition@c000 {
			label = "image-0";
			reg = <0x0000C000 0x37000>;
		};
		slot1_partition: partition@43000 {
			label = "image-1";
			reg = <0x00043000 0x37000>;
		};
		storage_partition: partition@7a000 {
			label = "storage";
			reg = <0x0007a000 0x00006000>;
		};
	};
};

During build there is error showing : unknwon node type "nordic,nrf52-dk-nrf52832"

My nrf52dk_52832.overlay is:

/ {
aliases {
    spi-flash0 = &flash_25lp128;
	};
    chosen 
	{ nordic,pm-ext-flash = &flash_25lp128; }; 
};

&spi2 {
	compatible = "nordic,nrf-spi"; //nordic,nrf-spi
	status = "okay";
	cs-gpios = <&gpio0 16 GPIO_ACTIVE_LOW>; /* P0.22 */
	pinctrl-0 = <&spi2_default>;
	pinctrl-1 = <&spi2_sleep>;
	pinctrl-names = "default", "sleep";

	flash_25lp128: flash_25lp128@0 {
		compatible = "jedec,spi-nor";
		reg = <0>;
		label = "FLASH_25LP128";
		// power_resources = <&flash_on>;
		spi-max-frequency = <8000000>;
		size = <134217728>;
		wp-gpios = <&gpio0 11 GPIO_ACTIVE_LOW>; // gpio 0 pin P0.11
		hold-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>; // gpio 0 pin P0.12
		jedec-id = [9d 60 18];
	};
};

/*
sck-pin = <25>; // gpio 0 pin P0.25
mosi-pin = <23>; // gpio 0 pin P0.23
miso-pin = <24>; // gpio 0 pin P0.24 */

My prj.conf is : (same as from the samples/subsys/fs/littlefs/)

# Optionally force the file system to be recreated
#CONFIG_APP_WIPE_STORAGE=y

# fs_dirent structures are big.
CONFIG_MAIN_STACK_SIZE=4096

# Let __ASSERT do its job
CONFIG_DEBUG=y

CONFIG_LOG=y
CONFIG_LOG_MODE_MINIMAL=y

CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y

CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_LITTLEFS=y

There is a warning for this file:

CONFIG_FLASH_MAP was assigned the value y, but got the value n. Missing dependencies:
FLASH_HAS_DRIVER_ENABLED

CONFIG_FLASH_PAGE_LAYOUT was assigned the value y, but got the value n. Missing dependencies:
FLASH_HAS_PAGE_LAYOUT

CONFIG_SPI_NOR was assigned the value y, but got the value n. Missing dependencies:
DT_HAS_JEDEC_SPI_NOR_ENABLED

CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE couldn't be set. Missing dependencies:
SPI_NOR

As I am new to nrf52dk boards, few basic questions:

1. In my .dts file, should I delete all gpio assignments other than those menioned in spi2?
2. How should I change my config (prj.config) file?
3. For the above configuration I am using the code given in:  

   "samples/subsys/fs/littlefs"

   instead of :

   "samples/subsys/usb/mass/" ? or "samples/subsys/fs/fs_sample"

4. The prj.config file shows many error on "CONFIG_SPI_NOR" and others, how do I correct it for my external spi nor flash from nrf52dk_52832 development kit?
   
   

Best,

AP

[Prasad A]

Hi Shahin97,

I am currently using the "samples/subsys/fs/littlefs" and try to change the std, overlay and prj.conf. Therefore I need some help there.

I have a external SPI NOR FLASH (25lp128 from ISSI) connected to my nrf52dk_52832 development board kit.

The connection are:

SPI_CE_PIN = P0.22 // chip enable
SPI_MISO_PIN = P0.23 // SO
SPI_MOSI_PIN = P0.24 // SI
SPI_SCK_PIN = P0.25 //SCK
SPI_HOLD_PIN = P0.11 //HOLD or RESET (not sure if it should be connected)
SPI_WP_PIN = P0.12 // Write protect (not sure if it should be connected)

My nrf52dk_52832.dts is:

/dts-v1/;
#include <nordic/nrf52832_qfaa.dtsi>
#include "nrf52dk_nrf52832-pinctrl.dtsi"
#include <zephyr/dt-bindings/input/input-event-codes.h>

/ {
	model = "Nordic nRF52 DK NRF52832";
	compatible = "nordic,nrf52-dk-nrf52832";

	chosen {
		zephyr,console = &uart0;
		zephyr,shell-uart = &uart0;
		zephyr,uart-mcumgr = &uart0;
		zephyr,bt-mon-uart = &uart0;
		zephyr,bt-c2h-uart = &uart0;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
		zephyr,code-partition = &slot0_partition;
	};

	arduino_header: connector {
		compatible = "arduino-header-r3";
		#gpio-cells = <2>;
		gpio-map-mask = <0xffffffff 0xffffffc0>;
		gpio-map-pass-thru = <0 0x3f>;
		gpio-map = <0 0 &gpio0 3 0>,	/* A0 */
			   <1 0 &gpio0 4 0>,	/* A1 */
			   <2 0 &gpio0 28 0>,	/* A2 */
			   <3 0 &gpio0 29 0>,	/* A3 */
			   <4 0 &gpio0 30 0>,	/* A4 */
			   <5 0 &gpio0 31 0>,	/* A5 */
			   <6 0 &gpio0 11 0>,	/* D0 */
			   <7 0 &gpio0 12 0>,	/* D1 */
			   <8 0 &gpio0 13 0>,	/* D2 */
			   <9 0 &gpio0 14 0>,	/* D3 */
			   <10 0 &gpio0 15 0>,	/* D4 */
			   <11 0 &gpio0 16 0>,	/* D5 */
			   <12 0 &gpio0 17 0>,	/* D6 */
			   <13 0 &gpio0 18 0>,	/* D7 */
			   <14 0 &gpio0 19 0>,	/* D8 */
			   <15 0 &gpio0 20 0>,	/* D9 */
			   <16 0 &gpio0 22 0>,	/* D10 */
			   <17 0 &gpio0 23 0>,	/* D11 */
			   <18 0 &gpio0 24 0>,	/* D12 */
			   <19 0 &gpio0 25 0>,	/* D13 */
			   <20 0 &gpio0 26 0>,	/* D14 */
			   <21 0 &gpio0 27 0>;	/* D15 */
	};

	arduino_adc: analog-connector {
		compatible = "arduino,uno-adc";
		#io-channel-cells = <1>;
		io-channel-map = <0 &adc 1>,	/* A0 = P0.3 = AIN1 */
				 <1 &adc 2>,	/* A1 = P0.4 = AIN2 */
				 <2 &adc 4>,	/* A2 = P0.28 = AIN4 */
				 <3 &adc 5>,	/* A3 = P0.29 = AIN5 */
				 <4 &adc 6>,	/* A4 = P0.30 = AIN6 */
				 <5 &adc 7>;	/* A5 = P0.31 = AIN7 */
	};

	/* These aliases are provided for compatibility with samples */
	aliases {

	};
};

&adc {
	status = "okay";
};

&uicr {
	gpio-as-nreset;
};

&gpiote {
	status = "okay";
};

&gpio0 {
	status = "okay";
};

arduino_serial: &uart0 {
	status = "okay";
	compatible = "nordic,nrf-uarte";
	current-speed = <115200>;
	pinctrl-0 = <&uart0_default>;
	pinctrl-1 = <&uart0_sleep>;
	pinctrl-names = "default", "sleep";
};

arduino_i2c: &i2c0 {
	compatible = "nordic,nrf-twi";
	status = "okay";
	pinctrl-0 = <&i2c0_default>;
	pinctrl-1 = <&i2c0_sleep>;
	pinctrl-names = "default", "sleep";
};


&spi0 {
	compatible = "nordic,nrf-spi";
	/* Cannot be used together with i2c0. */
	/* status = "okay"; */
	pinctrl-0 = <&spi0_default>;
	pinctrl-1 = <&spi0_sleep>;
	pinctrl-names = "default", "sleep";
};

&spi1 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	pinctrl-0 = <&spi1_default>;
	pinctrl-1 = <&spi1_sleep>;
	pinctrl-names = "default", "sleep";
};

arduino_spi: &spi2 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	cs-gpios = <&arduino_header 16 GPIO_ACTIVE_LOW>; /* D10 */
	pinctrl-0 = <&spi2_default>;
	pinctrl-1 = <&spi2_sleep>;
	pinctrl-names = "default", "sleep";
};

&flash0 {

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

		boot_partition: partition@0 {
			label = "mcuboot";
			reg = <0x00000000 0xc000>;
		};
		slot0_partition: partition@c000 {
			label = "image-0";
			reg = <0x0000C000 0x37000>;
		};
		slot1_partition: partition@43000 {
			label = "image-1";
			reg = <0x00043000 0x37000>;
		};
		storage_partition: partition@7a000 {
			label = "storage";
			reg = <0x0007a000 0x00006000>;
		};
	};
};

1. Is the dtsi file included corrected here: "#include <nordic/nrf52832_qfaa.dtsi" ?
2. Error showing : unknown node type "nordic,nrf52-dk-nrf52832". DO you know why this is?

My nrf52dk_52832.overlay is:

/ {
aliases {
    spi-flash0 = &flash_25lp128;
	};
    chosen 
	{ nordic,pm-ext-flash = &flash_25lp128; }; 
};

&spi2 {
	compatible = "nordic,nrf-spi"; //nordic,nrf-spi
	status = "okay";
	cs-gpios = <&gpio0 16 GPIO_ACTIVE_LOW>; /* P0.22 */
	pinctrl-0 = <&spi2_default>;
	pinctrl-1 = <&spi2_sleep>;
	pinctrl-names = "default", "sleep";

	flash_25lp128: flash_25lp128@0 {
		compatible = "jedec,spi-nor";
		reg = <0>;
		label = "FLASH_25LP128";
		// power_resources = <&flash_on>;
		spi-max-frequency = <8000000>;
		size = <134217728>;
		wp-gpios = <&gpio0 11 GPIO_ACTIVE_LOW>; // gpio 0 pin P0.11
		hold-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>; // gpio 0 pin P0.12
		jedec-id = [9d 60 18];
	};
};

/*
sck-pin = <25>; // gpio 0 pin P0.25
mosi-pin = <23>; // gpio 0 pin P0.23
miso-pin = <24>; // gpio 0 pin P0.24 */

My prj.conf is : (same as from the samples/subsys/fs/littlefs/)

# Optionally force the file system to be recreated
#CONFIG_APP_WIPE_STORAGE=y

# fs_dirent structures are big.
CONFIG_MAIN_STACK_SIZE=4096

# Let __ASSERT do its job
CONFIG_DEBUG=y

CONFIG_LOG=y
CONFIG_LOG_MODE_MINIMAL=y

CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y

CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_LITTLEFS=y

CONFIG_SPI=y
CONFIG_SPI_NOR=y
CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096

CONFIG_MULTITHREADING=y

       3. There is a warning for this file:

CONFIG_FLASH_MAP was assigned the value y, but got the value n. Missing dependencies:
FLASH_HAS_DRIVER_ENABLED

CONFIG_FLASH_PAGE_LAYOUT was assigned the value y, but got the value n. Missing dependencies:
FLASH_HAS_PAGE_LAYOUT

CONFIG_SPI_NOR was assigned the value y, but got the value n. Missing dependencies:
DT_HAS_JEDEC_SPI_NOR_ENABLED

CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE couldn't be set. Missing dependencies:
SPI_NOR

As I am new to nrf52dk boards, some input I would appreciate on:

     4. In my .dts file, should I delete all gpio assignments other than those menioned in spi2?
     5.How should I change my config (prj.config) file?

For the above configuration I am using the code given in: 

               "samples/subsys/fs/littlefs"

instead of :
               "samples/subsys/usb/mass/" ? or "samples/subsys/fs/fs_sample"

     6. The prj.config file shows many error on "CONFIG_SPI_NOR" as shown above, how do I correct it for my external spi nor flash from nrf52dk_52832 development kit?

Best,

AP

[dejans]

Hi Prasad A ,

Your errors are unexpected. I have tested unmodified littlefs sample in NCS v2.5.0 with your overlay and could not reproduce mentioned errors.

There are several steps you could follow if you want to enable littlefs on external flash. You could try to enable partition manager CONFIG_PARTITION_MANAGER_ENABLED=y, ensure that your SPI driver is enabled, add CONFIG_PM_PARTITION_REGION_LITTLEFS_EXTERNAL=y, and define the flash in your devicetree.

You can find more information about external flash memory partitions in the documentation. For storing partitions in the devicetree, you can choose the value of <nordic, pm-ext-flash> property as it is shown on previously linked page.

Best regards,
Dejan

[Prasad A]

Hi Dejan,

Following your instructions, I have added spi driver and partition to my overlay file but I am having the same few configuration warnings and other errors before building:

This is my overlay file:

/delete-node/ &storage_partition;

/ {
    chosen {
        nordic,pm-ext-flash = &25lp128;
    };
};

/*	aliases {
		ext-flash = &flash_25lp128;
};*/
fstab {
    compatible = "zephyr,fstab";
    lfs1: lfs1 {
        compatible = "zephyr,fstab,littlefs";
        mount-point = "/lfs1";
        partition = <&lfs1_part>;
        automount;
        read-size = <16>;
        prog-size = <16>;
        cache-size = <64>;
        lookahead-size = <32>;
        block-cycles = <512>;
    };
};

&spi2 {
    25lp128: flash_25lp128@0 {
        compatible = "jedec,spi-nor";
        status = "okay";
        label = "25LP128";
        reg = <0>;
        spi-max-frequency = <133000000>; /* Adjust based on your flash specifications */
        size = <0x8000000>; /* Adjust based on your flash size */
        has-dpd;
        t-enter-dpd = <3000>;
        t-exit-dpd = <30000>;
        jedec-id = [ 9D 60 18 ]; /* Adjust based on your flash JEDEC ID */
        };
    };

    &pinctrl {
        spi2_default: spi2_default {
            group1 {
                psels = <NRF_PSEL(SPIM_SCK, 0, 25)>, /* gpio 0 pin P0.25 */
                        <NRF_PSEL(SPIM_MISO, 0, 24)>, /* gpio 0 pin P0.24 */
                        <NRF_PSEL(SPIM_MOSI, 0, 23)>; /* gpio 0 pin P0.23 */
            };
        };

        spi2_sleep: spi2_sleep {
            group1 {
                psels = <NRF_PSEL(SPIM_SCK, 0, 25)>, /* gpio 0 pin P0.25 */
                        <NRF_PSEL(SPIM_MISO, 0, 24)>, /* gpio 0 pin P0.24 */
                        <NRF_PSEL(SPIM_MOSI, 0, 23)>; /* gpio 0 pin P0.23 */
            };
        };
    };

&25lp128 {
    partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;

		lfs1_part: partition@0 {
			label = "storage";
			reg = <0x00000000 0x00800000>;
		};
	};
};

Is my overlay for the external flash partition correct?

This is my prj.config file :

# Optionally force the file system to be recreated
#CONFIG_APP_WIPE_STORAGE=y

# fs_dirent structures are big.
CONFIG_MAIN_STACK_SIZE=4096

# Let __ASSERT do its job
CONFIG_DEBUG=y

CONFIG_LOG=y
CONFIG_LOG_MODE_MINIMAL=y

CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y

CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_LITTLEFS=y

CONFIG_SPI=y
CONFIG_SPI_NOR=y
CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096

CONFIG_SETTINGS=y
CONFIG_SETTINGS_FS=y
CONFIG_SETTINGS_FS_DIR="/lfs/settings"
CONFIG_SETTINGS_FS_FILE="/lfs/settings/run"

CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY=n
CONFIG_PARTITION_MANAGER_ENABLED=y
CONFIG_PM_PARTITION_REGION_LITTLEFS_EXTERNAL=y
CONFIG_PM_PARTITION_REGION_SETTINGS_STORAGE_EXTERNAL=y
CONFIG_PM_PARTITION_REGION_NVS_STORAGE_EXTERNAL=y
CONFIG_PM_OVERRIDE_EXTERNAL_DRIVER_CHECK=y

My nrf52dk_52832.dts file:

/dts-v1/;
#include <nordic/nrf52832_qfaa.dtsi>
#include "nrf52dk_nrf52832-pinctrl.dtsi"
#include <zephyr/dt-bindings/input/input-event-codes.h>

/ {
	model = "Nordic nRF52 DK NRF52832";
	compatible = "nordic,nrf52-dk-nrf52832";

	chosen {
		zephyr,console = &uart0;
		zephyr,shell-uart = &uart0;
		zephyr,uart-mcumgr = &uart0;
		zephyr,bt-mon-uart = &uart0;
		zephyr,bt-c2h-uart = &uart0;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
		zephyr,code-partition = &slot0_partition;
	};

	leds {
		compatible = "gpio-leds";
		led0: led_0 {
			gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
			label = "Green LED 0";
		};
		led1: led_1 {
			gpios = <&gpio0 18 GPIO_ACTIVE_LOW>;
			label = "Green LED 1";
		};
		led2: led_2 {
			gpios = <&gpio0 19 GPIO_ACTIVE_LOW>;
			label = "Green LED 2";
		};
		led3: led_3 {
			gpios = <&gpio0 20 GPIO_ACTIVE_LOW>;
			label = "Green LED 3";
		};
	};

	pwmleds {
		compatible = "pwm-leds";
		pwm_led0: pwm_led_0 {
			pwms = <&pwm0 0 PWM_MSEC(20) PWM_POLARITY_INVERTED>;
		};
	};

	buttons {
		compatible = "gpio-keys";
		button0: button_0 {
			gpios = <&gpio0 13 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
			label = "Push button switch 0";
			zephyr,code = <INPUT_KEY_0>;
		};
		button1: button_1 {
			gpios = <&gpio0 14 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
			label = "Push button switch 1";
			zephyr,code = <INPUT_KEY_1>;
		};
		button2: button_2 {
			gpios = <&gpio0 15 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
			label = "Push button switch 2";
			zephyr,code = <INPUT_KEY_2>;
		};
		button3: button_3 {
			gpios = <&gpio0 16 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
			label = "Push button switch 3";
			zephyr,code = <INPUT_KEY_3>;
		};
	};

	arduino_header: connector {
		compatible = "arduino-header-r3";
		#gpio-cells = <2>;
		gpio-map-mask = <0xffffffff 0xffffffc0>;
		gpio-map-pass-thru = <0 0x3f>;
		gpio-map = <0 0 &gpio0 3 0>,	/* A0 */
			   <1 0 &gpio0 4 0>,	/* A1 */
			   <2 0 &gpio0 28 0>,	/* A2 */
			   <3 0 &gpio0 29 0>,	/* A3 */
			   <4 0 &gpio0 30 0>,	/* A4 */
			   <5 0 &gpio0 31 0>,	/* A5 */
			   <6 0 &gpio0 11 0>,	/* D0 */
			   <7 0 &gpio0 12 0>,	/* D1 */
			   <8 0 &gpio0 13 0>,	/* D2 */
			   <9 0 &gpio0 14 0>,	/* D3 */
			   <10 0 &gpio0 15 0>,	/* D4 */
			   <11 0 &gpio0 16 0>,	/* D5 */
			   <12 0 &gpio0 17 0>,	/* D6 */
			   <13 0 &gpio0 18 0>,	/* D7 */
			   <14 0 &gpio0 19 0>,	/* D8 */
			   <15 0 &gpio0 20 0>,	/* D9 */
			   <16 0 &gpio0 22 0>,	/* D10 */
			   <17 0 &gpio0 23 0>,	/* D11 */
			   <18 0 &gpio0 24 0>,	/* D12 */
			   <19 0 &gpio0 25 0>,	/* D13 */
			   <20 0 &gpio0 26 0>,	/* D14 */
			   <21 0 &gpio0 27 0>;	/* D15 */
	};

	arduino_adc: analog-connector {
		compatible = "arduino,uno-adc";
		#io-channel-cells = <1>;
		io-channel-map = <0 &adc 1>,	/* A0 = P0.3 = AIN1 */
				 <1 &adc 2>,	/* A1 = P0.4 = AIN2 */
				 <2 &adc 4>,	/* A2 = P0.28 = AIN4 */
				 <3 &adc 5>,	/* A3 = P0.29 = AIN5 */
				 <4 &adc 6>,	/* A4 = P0.30 = AIN6 */
				 <5 &adc 7>;	/* A5 = P0.31 = AIN7 */
	};

	/* These aliases are provided for compatibility with samples */
	aliases {
		led0 = &led0;
		led1 = &led1;
		led2 = &led2;
		led3 = &led3;
		pwm-led0 = &pwm_led0;
		sw0 = &button0;
		sw1 = &button1;
		sw2 = &button2;
		sw3 = &button3;
		bootloader-led0 = &led0;
		mcuboot-button0 = &button0;
		mcuboot-led0 = &led0;
		watchdog0 = &wdt0;
	};
};

&adc {
	status = "okay";
};

&uicr {
	gpio-as-nreset;
};

&gpiote {
	status = "okay";
};

&gpio0 {
	status = "okay";
};

arduino_serial: &uart0 {
	status = "okay";
	compatible = "nordic,nrf-uarte";
	current-speed = <115200>;
	pinctrl-0 = <&uart0_default>;
	pinctrl-1 = <&uart0_sleep>;
	pinctrl-names = "default", "sleep";
};

arduino_i2c: &i2c0 {
	compatible = "nordic,nrf-twi";
	status = "okay";
	pinctrl-0 = <&i2c0_default>;
	pinctrl-1 = <&i2c0_sleep>;
	pinctrl-names = "default", "sleep";
};

&i2c1 {
	compatible = "nordic,nrf-twi";
	/* Cannot be used together with spi1. */
	/* status = "okay"; */
	pinctrl-0 = <&i2c1_default>;
	pinctrl-1 = <&i2c1_sleep>;
	pinctrl-names = "default", "sleep";
};

&pwm0 {
	status = "okay";
	pinctrl-0 = <&pwm0_default>;
	pinctrl-1 = <&pwm0_sleep>;
	pinctrl-names = "default", "sleep";
};

&spi0 {
	compatible = "nordic,nrf-spi";
	/* Cannot be used together with i2c0. */
	/* status = "okay"; */
	pinctrl-0 = <&spi0_default>;
	pinctrl-1 = <&spi0_sleep>;
	pinctrl-names = "default", "sleep";
};

&spi1 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	pinctrl-0 = <&spi1_default>;
	pinctrl-1 = <&spi1_sleep>;
	pinctrl-names = "default", "sleep";
};

arduino_spi: &spi2 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	cs-gpios = <&arduino_header 16 GPIO_ACTIVE_LOW>; /* D10 */
	pinctrl-0 = <&spi2_default>;
	pinctrl-1 = <&spi2_sleep>;
	pinctrl-names = "default", "sleep";
};

&flash0 {

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

		boot_partition: partition@0 {
			label = "mcuboot";
			reg = <0x00000000 0xc000>;
		};
		slot0_partition: partition@c000 {
			label = "image-0";
			reg = <0x0000C000 0x37000>;
		};
		slot1_partition: partition@43000 {
			label = "image-1";
			reg = <0x00043000 0x37000>;
		};
		storage_partition: partition@7a000 {
			label = "storage";
			reg = <0x0007a000 0x00006000>;
		};
	};
};

How do I solve these configuration problems of assigning "y" to my config variable?

For my dts file the node type "nordic,nrf52-dk-nrf52832" is not identified?

After doing a pristine building i am getting a cmake error:

 *  Executing task: nRF Connect: Build [pristine]: littlefs/build (active) 

Building littlefs
west build --build-dir c:/Users/prasa/Desktop/nrf52dk/littlefs/build c:/Users/prasa/Desktop/nrf52dk/littlefs --pristine --board nrf52dk_nrf52832 --no-sysbuild -- -DNCS_TOOLCHAIN_VERSION=NONE -DBOARD_ROOT=c:/users/prasa/desktop/nrf52dk/littlefs -DCONF_FILE=c:/Users/prasa/Desktop/nrf52dk/littlefs/prj.conf -DDTC_OVERLAY_FILE=c:/Users/prasa/Desktop/nrf52dk/littlefs/nrf52dk_nrf52832.overlay

-- west build: generating a build system
Loading Zephyr default modules (Zephyr base).
-- Application: C:/Users/prasa/Desktop/nrf52dk/littlefs
-- CMake version: 3.20.5
-- Found Python3: C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/bin/python.exe (found suitable version "3.8.2", minimum required is "3.8") found components: Interpreter 
-- Cache files will be written to: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/.cache
-- Zephyr version: 3.4.99 (C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr)
-- Found west (found suitable version "1.1.0", minimum required is "0.14.0")
-- Board: nrf52dk_nrf52832
-- Found host-tools: zephyr 0.16.1 (C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/zephyr-sdk)
-- Found toolchain: zephyr 0.16.1 (C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/zephyr-sdk)
-- Found Dtc: C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6") 
-- Found BOARD.dts: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/boards/arm/nrf52dk_nrf52832/nrf52dk_nrf52832.dts
-- Found devicetree overlay: c:/Users/prasa/Desktop/nrf52dk/littlefs/nrf52dk_nrf52832.overlay
devicetree error: c:/Users/prasa/Desktop/nrf52dk/littlefs/nrf52dk_nrf52832.overlay:33 (column 5): parse error: expected node name, property name, or '}'
-- In: C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr, command: C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/bin/python.exe;C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/scripts/dts/gen_defines.py;--dts;C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/zephyr.dts.pre;--dtc-flags;'-Wno-unique_unit_address_if_enabled';--bindings-dirs;C:/Users/prasa/Desktop/nrf52dk/v2.5.0/nrf/dts/bindings;C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/dts/bindings;--header-out;C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/include/generated/devicetree_generated.h.new;--dts-out;C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/zephyr.dts.new;--edt-pickle-out;C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/edt.pickle;--vendor-prefixes;C:/Users/prasa/Desktop/nrf52dk/v2.5.0/nrf/dts/bindings/vendor-prefixes.txt;--vendor-prefixes;C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/dts/bindings/vendor-prefixes.txt
CMake Error at C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/cmake/modules/dts.cmake:279 (message):
  gen_defines.py failed with return code: 1
Call Stack (most recent call first):
  C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/cmake/modules/zephyr_default.cmake:129 (include)
  C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
  C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
  CMakeLists.txt:8 (find_package)


-- Configuring incomplete, errors occurred!
FATAL ERROR: command exited with status 1: 'C:\Users\prasa\Desktop\nrf52dk\toolchains\c57af46cb7\opt\bin\cmake.EXE' -DWEST_PYTHON=C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/bin/python.exe '-Bc:\Users\prasa\Desktop\nrf52dk\littlefs\build' -GNinja -DBOARD=nrf52dk_nrf52832 -DNCS_TOOLCHAIN_VERSION=NONE -DBOARD_ROOT=c:/users/prasa/desktop/nrf52dk/littlefs -DCONF_FILE=c:/Users/prasa/Desktop/nrf52dk/littlefs/prj.conf -DDTC_OVERLAY_FILE=c:/Users/prasa/Desktop/nrf52dk/littlefs/nrf52dk_nrf52832.overlay '-Sc:\Users\prasa\Desktop\nrf52dk\littlefs'

 *  The terminal process terminated with exit code: 1. 
 *  Terminal will be reused by tasks, press any key to close it. 

Best regards,

AP

[dejans]

Hi AP,

You could try to add following configuration options to your prj.conf:
CONFIG_SPI_NOR_SFDP_DEVICETREE=y
CONFIG_FLASH_JESD216_API=y

Additionally, please have a look at spi overlay and spi conf (for nrf52840) as a reference.

Best regards,
Dejan

[Prasad A]

Hi dejans,

I cannot add "CONFIG_SPI_NOR_SFDP_DEVICETREE=y and CONFIG_FLASH_JESD216_API=y" because the external spi_nor flash issi,is25lp128 doesnit have an SFDP table. Therefore I have avoided these parameters.

I was able to resolve the errors for littlefs in spi_nor flash memory and flash the files to my device.

This is my build and flash log to my device:1050370044 (nrf52dk) 

 *  Executing task: nRF Connect: Build: littlefs/build (active) 

Building littlefs
west build --build-dir c:/Users/prasa/Desktop/nrf52dk/littlefs/build c:/Users/prasa/Desktop/nrf52dk/littlefs

[0/1] Re-running CMake...
Loading Zephyr default modules (Zephyr base (cached)).
-- Application: C:/Users/prasa/Desktop/nrf52dk/littlefs
-- CMake version: 3.20.5
-- Found Python3: C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/bin/python.exe (found suitable version "3.8.2", minimum required is "3.8") found components: Interpreter 
-- Cache files will be written to: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/.cache
-- Zephyr version: 3.4.99 (C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr)
-- Found west (found suitable version "1.1.0", minimum required is "0.14.0")
-- Board: nrf52dk_nrf52832
-- Found host-tools: zephyr 0.16.1 (C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/zephyr-sdk)
-- Found toolchain: zephyr 0.16.1 (C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/zephyr-sdk)
-- Found BOARD.dts: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/boards/arm/nrf52dk_nrf52832/nrf52dk_nrf52832.dts
-- Found devicetree overlay: c:/Users/prasa/Desktop/nrf52dk/littlefs/nrf52dk_nrf52832.overlay
'label' is marked as deprecated in 'properties:' in C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/dts/bindings\mtd\jedec,spi-nor.yaml for node /soc/spi@40023000/IS25LP128@0.
-- Generated zephyr.dts: C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/zephyr.dts
-- Generated devicetree_generated.h: C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/include/generated/devicetree_generated.h
-- Including generated dts.cmake file: C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/dts.cmake

warning: Deprecated symbol SETTINGS_FS is enabled.

Parsing C:/Users/prasa/Desktop/nrf52dk/littlefs/Kconfig
Loaded configuration 'C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/.config'
No change to configuration in 'C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/.config'
No change to Kconfig header in 'C:/Users/prasa/Desktop/nrf52dk/littlefs/build/zephyr/include/generated/autoconf.h'
-- Found Python3: C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/bin/python.exe (found version "3.8.2") found components: Interpreter 

=== child image mcuboot -  begin ===
loading initial cache file C:/Users/prasa/Desktop/nrf52dk/littlefs/build/mcuboot/child_image_preload.cmake
Loading Zephyr default modules (Zephyr base (cached)).
-- Application: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/zephyr
-- CMake version: 3.20.5
-- Cache files will be written to: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/.cache
-- Zephyr version: 3.4.99 (C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr)
-- Found west (found suitable version "1.1.0", minimum required is "0.14.0")
-- Board: nrf52dk_nrf52832
-- Found host-tools: zephyr 0.16.1 (C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/zephyr-sdk)
-- Found toolchain: zephyr 0.16.1 (C:/Users/prasa/Desktop/nrf52dk/toolchains/c57af46cb7/opt/zephyr-sdk)
-- Found BOARD.dts: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/boards/arm/nrf52dk_nrf52832/nrf52dk_nrf52832.dts
-- Found devicetree overlay: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/zephyr/app.overlay
-- Generated zephyr.dts: C:/Users/prasa/Desktop/nrf52dk/littlefs/build/mcuboot/zephyr/zephyr.dts
-- Generated devicetree_generated.h: C:/Users/prasa/Desktop/nrf52dk/littlefs/build/mcuboot/zephyr/include/generated/devicetree_generated.h
-- Including generated dts.cmake file: C:/Users/prasa/Desktop/nrf52dk/littlefs/build/mcuboot/zephyr/dts.cmake
Parsing C:/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/zephyr/Kconfig
Loaded configuration 'C:/Users/prasa/Desktop/nrf52dk/littlefs/build/mcuboot/zephyr/.config'
No change to configuration in 'C:/Users/prasa/Desktop/nrf52dk/littlefs/build/mcuboot/zephyr/.config'
No change to Kconfig header in 'C:/Users/prasa/Desktop/nrf52dk/littlefs/build/mcuboot/zephyr/include/generated/autoconf.h'
CMake Warning at C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/CMakeLists.txt:893 (message):
  No SOURCES given to Zephyr library: drivers__spi

  Excluding target from build.


MCUBoot bootloader key file: C:/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/root-rsa-2048.pem
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/prasa/Desktop/nrf52dk/littlefs/build/mcuboot
=== child image mcuboot -  end ===

CMake Warning at C:/Users/prasa/Desktop/nrf52dk/v2.5.0/nrf/modules/mcuboot/CMakeLists.txt:320 (message):
  

          ---------------------------------------------------------
          --- WARNING: Using default MCUBoot key, it should not ---
          --- be used for production.                           ---
          ---------------------------------------------------------
          



CMake Warning at C:/Users/prasa/Desktop/nrf52dk/v2.5.0/nrf/cmake/partition_manager.cmake:79 (message):
  

          ---------------------------------------------------------------------
          --- WARNING: Using a bootloader without pm_static.yml.            ---
          --- There are cases where a deployed product can consist of       ---
          --- multiple images, and only a subset of these images can be     ---
          --- upgraded through a firmware update mechanism. In such cases,  ---
          --- the upgradable images must have partitions that are static    ---
          --- and are matching the partition map used by the bootloader     ---
          --- programmed onto the device.                                   ---
          ---------------------------------------------------------------------
          

Call Stack (most recent call first):
  C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/cmake/modules/kernel.cmake:247 (include)
  C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/cmake/modules/zephyr_default.cmake:138 (include)
  C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
  C:/Users/prasa/Desktop/nrf52dk/v2.5.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:97 (include_boilerplate)
  CMakeLists.txt:8 (find_package)


-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/prasa/Desktop/nrf52dk/littlefs/build
[0/149] Performing build step for 'mcuboot_subimage'
[1/29] Generating misc/generated/syscalls.json, misc/generated/struct_tags.json
[2/29] Building C object zephyr/CMakeFiles/zephyr.dir/subsys/storage/flash_map/flash_map_layout.c.obj
[3/29] Building C object zephyr/CMakeFiles/zephyr.dir/subsys/storage/flash_map/flash_map.c.obj
[4/29] Building C object zephyr/CMakeFiles/zephyr.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/nrf/subsys/partition_manager/flash_map_partition_manager.c.obj
[5/29] Generating linker_zephyr_pre0.cmd
[6/29] Building C object zephyr/lib/libc/common/CMakeFiles/lib__libc__common.dir/source/stdlib/malloc.c.obj
[7/29] Building C object CMakeFiles/app.dir/main.c.obj
[8/29] Building C object CMakeFiles/app.dir/flash_map_extended.c.obj
[9/29] Building C object CMakeFiles/app.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/image_validate.c.obj
[10/29] Building C object CMakeFiles/app.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/tlv.c.obj
[11/29] Linking C static library zephyr\libzephyr.a
[12/29] Linking C static library zephyr\lib\libc\common\liblib__libc__common.a
[13/29] Building C object CMakeFiles/app.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/image_rsa.c.obj
[14/29] Building C object CMakeFiles/app.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/bootutil_misc.c.obj
[15/29] Building C object CMakeFiles/app.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/swap_misc.c.obj
[16/29] Building C object CMakeFiles/app.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/loader.c.obj
[17/29] Building C object CMakeFiles/app.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/swap_scratch.c.obj
[18/29] Building C object CMakeFiles/app.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/swap_move.c.obj
[19/29] Building C object CMakeFiles/app.dir/nrf_cleanup.c.obj
[20/29] Linking C static library app\libapp.a
[21/29] Building C object zephyr/soc/soc/arm/common/cortex_m/CMakeFiles/soc__arm__common__cortex_m.dir/arm_mpu_regions.c.obj
[22/29] Linking C static library zephyr\soc\soc\arm\common\cortex_m\libsoc__arm__common__cortex_m.a
[23/29] Building C object modules/mcuboot/boot/bootutil/zephyr/CMakeFiles/mcuboot_util.dir/C_/Users/prasa/Desktop/nrf52dk/v2.5.0/bootloader/mcuboot/boot/bootutil/src/bootutil_public.c.obj
[24/29] Linking C static library modules\mcuboot\boot\bootutil\zephyr\libmcuboot_util.a
[25/29] Linking C executable zephyr\zephyr_pre0.elf
[26/29] Generating linker.cmd
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 *  Terminal will be reused by tasks, press any key to close it. 

 *  Executing task: nRF Connect: Flash: littlefs/build (active) 

Flashing build to 1050370044
west flash -d c:\Users\prasa\Desktop\nrf52dk\littlefs\build --skip-rebuild --dev-id 1050370044 --erase

-- west flash: using runner nrfjprog
-- runners.nrfjprog: mass erase requested
-- runners.nrfjprog: Flashing file: c:\Users\prasa\Desktop\nrf52dk\littlefs\build\zephyr\merged.hex
[ #################### ]   0.150s | Erase file - Done erasing                                                          
[ #################### ]   1.724s | Program file - Done programming                                                    
[ #################### ]   0.639s | Verify file - Done verifying                                                       
Enabling pin reset.
Applying pin reset.
-- runners.nrfjprog: Board with serial number 1050370044 flashed successfully.
 *  Terminal will be reused by tasks, press any key to close it. 

The external flash memory is not properly connected with my nrf52dk device as I noticed some warning in the above flash log and device log.

vCOM0 (COM4) log:

*** Booting nRF Connect SDK v2.5.0 ***
I: Starting bootloader
I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Image index: 0, Swap type: none
I: Bootloader chainload address offset: 0xc000
�E: Device id 00 00 00 does not match config 9d 60 18
I: littlefs partition at /lfs1
I: LittleFS version 2.5, disk version 2.0
E: can't open flash area 0
E: fs mount error (-19)
E: Automount /lfs1 failed: -19
*** Booting nRF Connect SDK v2.5.0 ***
Sample program to r/w files on littlefs
E: FAIL: unable to find flash area 0: -19

The flash memory was not accessed during this flash. How do I correct this error and connect my external flash to nrf52dk? (the pins are connect to SCK=P0.22,SO=P0.23,SI=P0.24,CE=P0.25)

MY OVERLAY:

/delete-node/ &storage_partition;


/ {
    chosen {
        nordic,pm-ext-flash = &IS25LP128;
    };
};


&spi2 {
    compatible = "nordic,nrf-spi";

    status = "okay";

    pinctrl-0 = <&spi2_default>;

    pinctrl-1 = <&spi2_sleep>;

    pinctrl-names = "default", "sleep";

    cs-gpios = <&gpio0 25 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
    
    IS25LP128: IS25LP128@0 {
        compatible = "jedec,spi-nor";
        status = "okay";
        label = "25LP128";
        reg = <0>;
        spi-max-frequency = <8000000>; /* Adjust based on your flash specifications */
        size = <0x8000000>; /* Adjust based on your flash size */
        has-dpd;
        t-enter-dpd = <3000>;
        t-exit-dpd = <30000>;
        jedec-id = [ 9D 60 18 ]; /* Adjust based on your flash JEDEC ID */
        //page_size = <2048>;
        //block_size = <131072>;

        };
    };

&pinctrl {
    spi2_default: spi2_default {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 0, 22)>, /* gpio 0 pin P0.25 */
                    <NRF_PSEL(SPIM_MISO, 0, 24)>, /* gpio 0 pin P0.24 */
                    <NRF_PSEL(SPIM_MOSI, 0, 23)>; /* gpio 0 pin P0.23 */
        };
    };

    spi2_sleep: spi2_sleep {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 0, 22)>, /* gpio 0 pin P0.25 */
                    <NRF_PSEL(SPIM_MISO, 0, 24)>, /* gpio 0 pin P0.24 */
                    <NRF_PSEL(SPIM_MOSI, 0, 23)>; /* gpio 0 pin P0.23 */
        };
    };
};


&IS25LP128 {
    partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;

		lfs1_part: partition@0 {
			label = "storage";
			reg = <0x00000000 0x00800000>;
		};
	};
};
/ {
	fstab {
		compatible = "zephyr,fstab";
		lfs1: lfs1 {
			compatible = "zephyr,fstab,littlefs";
			mount-point = "/lfs1";
			partition = <&lfs1_part>;
			automount;
			read-size = <16>;
			prog-size = <16>;
			cache-size = <64>;
			lookahead-size = <32>;
			block-cycles = <512>;
		};
	};
};
/delete-node/ &{/pin-controller/pwm0_default/group1/};
/delete-node/ &{/pin-controller/pwm0_sleep/group1/};

Best regards,

Aditi Prasad

[dejans]

Hi,

Could you connect your pins SCK=P0.22, SO=P0.23, SI=P0.24 and CE=P0.25 to the logic analyzer and provide logic trace?

Best regards,
Dejan

[Prasad A]

Hi,

At the moment I do not have access to a logic analyzer but I will try to aquire one. Meanwhile I was checking if my flash memory connection directly to the microcontroller could cause some error?

As there is no resistors attached to the spi pins but as far I have seen in the flash memory a voltage range of 1.7v to 3.6v of the microcontroller should be enough to function the spi pins of the flash (https://www.mouser.de/datasheet/2/198/IS25LP032-064-128-463542.pdf). 

Should I connect the HOLD and RESET pins to P0.11, P0.12 resp or conenct them to VDD here.

This is the connection I have right now.
  

Best regards,

Aditi Prasad

[dejans]

Hi,

There should be no need for additional resistors. It should also be fine to connect flash directly to the SoC. Regarding the pins, you could connect them directly to VDD.

Best regards,
Dejan