How to get started with NOR flash on Zephyr ?

RE: How to get started with NOR flash on Zephyr ?

Amanda Hsieh — Tue, 16 Jul 2024 15:39:00 GMT

You can refer to the overlay fils here https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/drivers/spi_flash/boards

Please create a new support for your issue.

RE: How to get started with NOR flash on Zephyr ?

xuezhi_zed — Tue, 16 Jul 2024 05:21:04 GMT

Hi, I am also working with NOR memory with nrf52840 and I realize the sample code does not provide overlay file, may I know how to define the pin connections . I try to create the overlay file but keep getting compiling error. did you create a new yaml file? Do you mind share your project if possible? Appreciate in advance

RE: How to get started with NOR flash on Zephyr ?

Amanda Hsieh — Wed, 02 Nov 2022 14:41:33 GMT

Hi,

The spicific module under v2.1.1 is not public on the github. If you install NCS v2.1.1 via Toolchain, you could see it. Please be aware that our support is limited to NCS instead of vanilla Zephyr, so I would suggest you use NCS.

Regards,
Amanda H.

RE: How to get started with NOR flash on Zephyr ?

rotem — Tue, 01 Nov 2022 20:31:02 GMT

sorry, or I must be blind but there is no modules\fs\littlefs folder in 2.11:

https://github.com/nrfconnect/sdk-nrf/tree/v2.1.1/modules

Am I missing something?

RE: How to get started with NOR flash on Zephyr ?

Amanda Hsieh — Tue, 01 Nov 2022 18:55:42 GMT

Hi,

Which version of NCS are you using?

If you are using v2.1.1, lfs.h is under modules\fs\littlefs.

-Amanda H.

RE: How to get started with NOR flash on Zephyr ?

rotem — Tue, 01 Nov 2022 16:40:29 GMT

Hi again,

I was able to make the NOR-flash run over SPI! Mainly the configuration for the SST25 had to be adapted and some particularity with our board.

I was also able to make the NVS Filesystem sample run.

Now I try with the littleFS sample and here I got stuck again: When building, I get an error saying

/zephyr/include/zephyr/fs/littlefs.h:14:10: fatal error: lfs.h: No such file or directory
14 | #include <lfs.h>

As this file does not exist nowhere in the filesystem I suppose it should be generated by zephyr but it isn't

Within littlefs.h I find

#include <lfs.h>

When I comment it out, some symbols like

struct lfs_config cfg;

are marked as unknown.

My dts looks like this:

&sst25 {
    partitions {
        compatible = "fixed-partitions";
        #address-cells = <1>;
        #size-cells = <1>;
        /* 16 KBy partition to use for LFS filesystem */
       partition@0001000 {
           label = "storage";
           reg = <0x0001000 0x0004000>;
       };
    };
};

and the node initialization like this:

FS_LITTLEFS_DECLARE_DEFAULT_CONFIG(_LfsConfig);
static struct fs_mount_t lfs_storage_mnt = {
   .type = FS_LITTLEFS,
   .fs_data = &_LfsConfig,
   .storage_dev = (void *)DT_FLASH_AREA_STORAGE_ID,
   .mnt_point = "/lfs",
};

and the conf like this:

CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_SPI_NOR=y
CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096
CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_LITTLEFS=y

Any idea what could cause this problem?

Thanx

Marco

RE: How to get started with NOR flash on Zephyr ?

rotem — Wed, 26 Oct 2022 15:20:24 GMT

Hi again,

I figured out the reason for the device_is_ready() = false: The initialization fails because the JEDEC-ID does not match. This is probably because of the way we initialize the SPI-interface.

I'll come back when I have new findings!

RE: How to get started with NOR flash on Zephyr ?

rotem — Wed, 26 Oct 2022 13:31:07 GMT

Hi,

Thank you for the quick reply!

With s_flashdevice_p = DEVICE_DT_GET(DT_NODELABEL(sst25));

I now get a non-null instance that looks like that:

s_flashdevice_p: 0x804ede8 <__device_dts_ord_626>
   name: 0x8059f6e "SST25VF016"
       *name: 83 'S'
   config: 0x8050c24 <spi_nor_config_0>
   api: 0x8050c10 <spi_nor_api>
   state: 0x20000d70 <__devstate_dts_ord_626>
       init_res: 22
       initialized: true
   data: 0x200053b4 <spi_nor_data_0>
   handles: 0x804f3d8 <__devicehdl_DT_N_S_soc_S_spi_40013000_S_sst25vf016_0>
       *handles: 36

But then, doing

device_is_ready( s_flashdevice_p );

returns false, due to init_res != 0 I guess.

Any hint what might be wrong with my setup?

In the sample, you use DEVICE_DT_GET(DT_ALIAS(spi_flash0)); Where is spi_flash0 definied? I can't find any dts in the sample project. It might be helpful as a starting point!

Thanx,

Marco

RE: How to get started with NOR flash on Zephyr ?

Amanda Hsieh — Tue, 25 Oct 2022 19:44:06 GMT

Hi,

[quote user=""]s_device_p = device_get_binding( FLASH_DEVICE ); //becomes 0x0[/quote]

Which version of NCS are you using? Is it v2.1.0? If so, func:`device_get_binding()` usage is removed in favor of func:`DEVICE_DT_GET()`. See the release-notes-2.1.0.

See the example here https://github.com/nrfconnect/sdk-zephyr/blob/main/samples/drivers/spi_flash/src/main.c#L37

Regards,
Amanda H.