nvs_get_stats is giving wrong results

[Chinmay_D]

Hello,
I have one structure that I want to store inside nvs using nvs blob. Before setting for the first time nvs_get_stats gives a result of used entries as 1. (Probably it is storing some data data).

I used a structure as below:

Code: [Select all] [Expand/Collapse]

1. typedef struct struct_name{
2.     uint32_t var1;
3.     uint32_t var2;
4.     uint32_t var3;
5. }struct_name;

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Code: [Select all] [Expand/Collapse]

1. ESP_ERROR_CHECK(nvs_open_from_partition("device_data", "device_data", NVS_READWRITE, &handle));
2. nvs_get_stats("device_data",&nvsStats);
3. ESP_LOGI("storage","used: %d, free: %d, total: %d, namespace count: %d", nvsStats.used_entries,
4.                 nvsStats.free_entries, nvsStats.total_entries, nvsStats.namespace_count);
5. esp_err_t result= nvs_get_blob(handle,DEVICE_DATA_KEY,(void *)&m_data, &size);

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But after nvs_set_blob, the used entries will go from 1 to 4 even if I used nvs_set_blob only once.
Please guide for this. I have to sue used entries as I want to store these structure for 100 times sequencially with different keys. To generate keys I have to use "used entries" from nvs_get_stats.

Thanks in advance.
Chinmay.

[ESP_Sprite]

See the docs: blobs have a variable amount of entries, plus they use some for housekeeping. Additionally, a namespace also takes up an entry.