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: [Select all] [Expand/Collapse]

1. static const char* NvsESP_info = "espInfo";
2. static const char* TAG = "eep";
3. char Serial_Number[10];
4. /******************************************************
5.  *               Function Definitions
6.  ******************************************************/
7. uint8_t device_settings_eep_get(void)
8. {
9.     uint8_t result = NULL;
10.     memcpy(Serial_Number, "0000-0000", sizeof(Serial_Number));  // Reset Serial Number
11.  
12.     // Open
13.     nvs_handle my_handle;
14.     nvs_open("nvs", NVS_READWRITE, &my_handle);
15.  
16.     // Read
17.     size_t required_size = sizeof(Serial_Number);
18.     // Read Serial Number from nvs partition
19.     nvs_get_str(my_handle, NvsESP_info, &Serial_Number[0], &required_size);
20.  
21.     // Close
22.     nvs_close(my_handle);
23.  
24.     // Compare Serial Number from nvs partition with Default (1234-1234)
25.     if(!memcmp(&Serial_Number[0], "1234-1234", 9))
26.     {
27.         result = 1;
28.         ESP_LOGI(TAG, "Serial Number:'%s'", &Serial_Number[0]);
29.     }
30.  
31.     return result;
32. }
33.  
34. void device_settings_eep_set(const char *key, char *value)
35. {
36.     nvs_handle my_handle;
37.  
38.     // Open
39.     nvs_open("nvs", NVS_READWRITE, &my_handle);
40.  
41.     // Write
42.     nvs_set_str(my_handle, key, value);
43.  
44.     // Commit
45.     nvs_commit(my_handle);
46.  
47.     // Close
48.     nvs_close(my_handle);
49. }
50.  
51.  
52. void device_settings_default_set(void)
53. {
54.     ESP_LOGI(TAG, "Setting Defaults ...");
55.  
56.     nvs_flash_erase();
57.     nvs_flash_init();
58.  
59.     memcpy(Serial_Number, "1234-1234", sizeof(Serial_Number));
60.  
61.     device_settings_eep_set(NvsESP_info,(char*)&Serial_Number);
62. }
63.  
64. void Init_nvs_partition(void)
65. {
66.     uint8_t value;
67.     nvs_flash_init();
68.     value = device_settings_eep_get();
69.  
70.     switch (value)
71.     {
72.         case 1:
73.             ESP_LOGE(TAG, "ESP nvs was successfully initialized!");
74.             break;
75.         default :
76.             ESP_LOGE(TAG, "Error, NO data!");
77.             device_settings_default_set();
78.             device_settings_eep_get();
79.             break;
80.     }
81. }
82.  

GeSHi © Codebox Plus Extension

[gianluca.siano]

Still doesn't function.

[ESP_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.