ESP32 Forum

Posted: **Fri Mar 20, 2020 4:24 pm**

There something weird happening when I try to clear the WiFi credentials on NVS:

int err = nvs_flash_erase();
printf("\r\nErased NVS with: %d", err);
err = nvs_flash_init();
printf("\r\ninit: %d", err);

// then I try to re-save the application data 
nvs_handle my_handle;
// Open
esp_err_t err = nvs_open(APP_SETTINGS_NAMESPACE, NVS_READWRITE, &my_handle);
ESP_ERROR_CHECK(err);
if (err != ESP_OK) {
return;
}

err = nvs_set_blob(my_handle, APP_SETTINGS_NAMESPACE, (void *) &(settings), sizeof(settings));
if (err != ESP_OK) return;

// Commit
err = nvs_commit(my_handle);
if (err != ESP_OK) return;

// Close
nvs_close(my_handle);

The commit happens successfully and I read back the values with an nvs_get_blob().

After a resetting ESP32 I get an ESP_ERR_NVS_NOT_FOUND when I try to read the committed data:

Code: Select all

nvs_handle handle;

	// Open
	esp_err_t err = nvs_open(APP_SETTINGS_NAMESPACE, NVS_READWRITE, &handle);
	ESP_ERROR_CHECK(err);

	if (err != ESP_OK) {
		return;
	}

	size_t required_size;
	err = nvs_get_blob(handle, APP_SETTINGS_NAMESPACE, NULL, &required_size);

	
	if (err == ESP_ERR_NVS_NOT_FOUND)
	{
		printf(" NVS NOT FOUND");
	}

This only happens when I perform the NVS erase. and it seems to work after another nvs_commit().

What am I doing wrong? Should there be a nvs_deinit()?

TIA

ESP32 Forum

ESP_ERR_NVS_NOT_FOUND on a namespace that does exist

ESP_ERR_NVS_NOT_FOUND on a namespace that does exist