CODEWITHSUNDEEP
arduinoesp32persistent-storageesp-idf
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Reputation: 83

ESP32 NVS get stored value fails with ESP_ERR_NVS_NOT_FOUND (0x1102)

Board: ESP32-WROOM with 16MB Flash size

As the title: reading values written into ESP32 board NVS partition fail with error code 4354 (0x1102) which corresponds to ESP_ERR_NVS_NOT_FOUND.

The error on official ESP API page: ESP_ERR_NVS_NOT_FOUND = Id namespace doesn’t exist yet and mode is NVS_READONLY

I cannot understand why, since I init with proper namespace and with NVS_READWRITE flag.

The code:

esp_err_t ret = 0;
nvs_handle handler = 0;
ret = nvs_flash_init_partition("nvs");
log_e("nvs_flash_init_partition CODE: %d", ret);

delay(500);

ret = nvs_open_from_partition("nvs", "tele", NVS_READWRITE, &handler);
log_e("nvs_open CODE: %d", ret);

delay(500);

ret = nvs_set_u8(handler, "kk", 7);
log_e("nvs_set_u8 CODE: %d", ret);

delay(500);

ret = nvs_commit(handler);
log_e("nvs_commit CODE: %d", ret);

delay(500);


int8_t max_buffer_size = 256; 
ret = nvs_get_i8(handler, "kk", &max_buffer_size);
log_e("nvs_get_u8 CODE: %d", ret);
log_e("nvs_get_u8 STORED: %d", max_buffer_size);

delay(500);

ret = nvs_flash_deinit_partition("nvs");
log_e("nvs_flash_deinit_partition CODE: %d", ret);

nvs_close(handler);

Note: I also tried without delays: same result.

the output:

begin(): nvs_flash_init_partition CODE: 0
begin(): nvs_open CODE: 0
begin(): nvs_set_u8 CODE: 0
begin(): nvs_commit CODE: 0
begin(): nvs_get_u8 CODE: 4354
begin(): nvs_get_u8 STORED: 0
begin(): nvs_flash_deinit_partition CODE: 0

Partitions:

 # Espressif ESP32 Partition Table
# Name, Type, SubType, Offset, Size, Flags

nvs,data,nvs,0x9000,16K,
otadata,data,ota,0xd000,8K,
phy_init,data,phy,0xf000,4K,
factory,app,factory,0x10000,8M,
ota_0,app,ota_0,0x810000,1M,
ota_1,app,ota_1,0x910000,1M,

Am I doing something wrong? Am I missing something?

Thanks!

UPDATE: Seemed that the test board flash was corrupted. I tried with another one and the code worked fine.

Upvotes: 2

Views: 3051

Answers (1)

Tarmo
Tarmo

Reputation: 4770

Take a look at this note in the documentation for nvs_set_u8():

Note that actual storage will not be updated until nvs_commit function is called.

So add a call to nvs_commit() immediately after nvs_set_u8():

ret = nvs_commit(handler);
log_e("nvs_commit CODE: %d", ret);

Upvotes: 4

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