Can not read strings from nvs partition after reboot (ESP_ERR_NVS_NOT_FOUND)

[gianluca.siano]

Hi,

I can not read strings from the nvs partition after reboot, but I can see the written data if I dump the nvs partition over uart (with esp tool).
If I write int8 data then it works, but not with strings or blob data, I always become ESP_ERR_NVS_NOT_FOUND after reboot.

Here is my Debug output, after every reboot:

[0;31mE (485) eep: Error, NO data![0m
[0;32mI (485) eep: Setting Defaults ...[0m
[0;32mI (695) eep: Serial Number:'1234-1234'[0m


Her is my code:

Code: nvs_blob.c Select all

static const char* NvsESP_info = "espInfo";

static const char* TAG = "eep";

char Serial_Number[10];

/******************************************************

 *               Function Definitions

 ******************************************************/

uint8_t device_settings_eep_get(void)

{

    uint8_t result = NULL;

    memcpy(Serial_Number, "0000-0000", sizeof(Serial_Number));	// Reset Serial Number



	// Open

	nvs_handle my_handle;

	nvs_open("nvs", NVS_READWRITE, &my_handle);



	// Read

    size_t required_size = sizeof(Serial_Number);

    // Read Serial Number from nvs partition

    nvs_get_str(my_handle, NvsESP_info, &Serial_Number[0], &required_size);



	// Close

	nvs_close(my_handle);



	// Compare Serial Number from nvs partition with Default (1234-1234)

	if(!memcmp(&Serial_Number[0], "1234-1234", 9))

	{

		result = 1;

		ESP_LOGI(TAG, "Serial Number:'%s'", &Serial_Number[0]);

	}



    return result;

}



void device_settings_eep_set(const char *key, char *value)

{

    nvs_handle my_handle;



    // Open

    nvs_open("nvs", NVS_READWRITE, &my_handle);



    // Write

    nvs_set_str(my_handle, key, value);



    // Commit

    nvs_commit(my_handle);



    // Close

    nvs_close(my_handle);

}





void device_settings_default_set(void)

{

	ESP_LOGI(TAG, "Setting Defaults ...");



	nvs_flash_erase();

	nvs_flash_init();



	memcpy(Serial_Number, "1234-1234", sizeof(Serial_Number));



	device_settings_eep_set(NvsESP_info,(char*)&Serial_Number);

}



void Init_nvs_partition(void)

{

	uint8_t value;

	nvs_flash_init();

	value = device_settings_eep_get();



	switch (value)

	{

		case 1:

			ESP_LOGE(TAG, "ESP nvs was successfully initialized!");

			break;

        default :

        	ESP_LOGE(TAG, "Error, NO data!");

        	device_settings_default_set();

        	device_settings_eep_get();

        	break;

	}

}

[gianluca.siano]

Still doesn't function.

[Sprite]

Code: Select all

    device_settings_eep_set(NvsESP_info, --> (char*)&Serial_Number <-- );

This probably doesn't do what you want it to do.

[mauriciofarina]

Hello!

Did you figure out how to solve it? I'm having the same problem. If I write a string or blob and read it without rebooting everything works great, but after rebooting they go missing...

[Oldeneill]

Well aware that this thread is pretty dated - but it pops up high in Google, so I thought I'd share in case someone still stumbles accross this issue as I did today

Had the exact same issue (did the write/commit/close-thingey as per the documentation) but rebooting kept giving me ESP_ERR_NVS_NOT_FOUND.

Turns out there's a little Comma-seperated names of partitions to clear on factory reset in the menuconfig's Bootloader config that said nvs as value - nice little "Aaahhhhhhh!"-moment..

Obvious course of action - just remove those 3 nasty little characters and you should be good to go

Side note: I'm not knowledgeable enough to tell if there's a good reason for clearing the default nvs partition after a factory reset; might be that the proper solution is to add a custom NVS partition via a partition csv or something. Going into the "cross that bridge when we get to it"-bin.