Chapter 2. API Reference
• ESP_OK on success
• ESP_ERR_NOT_FOUND if there is no partition with the specified parameters in the partition table
• ESP_ERR_INVALID_ARG in case partition is NULL
• one of the error codes from the underlying flash storage driver
Parameters
• [in] partition: pointer to a partition obtained by the ESP partition API.
esp_err_t nvs_flash_secure_init(nvs_sec_cfg_t *cfg)
Initialize the default NVS partition.
This API initialises the default NVS partition. The default NVS partition is the one that is labeled “nvs”in
the partition table.
Return
• ESP_OK if storage has been initialized successfully.
• ESP_ERR_NVS_NO_FREE_PAGES if the NVS storage contains no empty pages (which may hap-
pen if NVS partition was truncated)
• ESP_ERR_NOT_FOUND if no partition with label “nvs”is found in the partition table
• ESP_ERR_NO_MEM in case memory could not be allocated for the internal structures
• one of the error codes from the underlying flash storage driver
Parameters
• [in] cfg: Security configuration (keys) to be used for NVS encryption/decryption. If cfg is
NULL, no encryption is used.
esp_err_t nvs_flash_secure_init_partition(const char *partition_label, nvs_sec_cfg_t *cfg)
Initialize NVS flash storage for the specified partition.
Return
• ESP_OK if storage has been initialized successfully.
• ESP_ERR_NVS_NO_FREE_PAGES if the NVS storage contains no empty pages (which may hap-
pen if NVS partition was truncated)
• ESP_ERR_NOT_FOUND if specified partition is not found in the partition table
• ESP_ERR_NO_MEM in case memory could not be allocated for the internal structures
• one of the error codes from the underlying flash storage driver
Parameters
• [in] partition_label: Label of the partition. Note that internally, a reference to passed
value is kept and it should be accessible for future operations
• [in] cfg: Security configuration (keys) to be used for NVS encryption/decryption. If cfg is null,
no encryption/decryption is used.
esp_err_t nvs_flash_generate_keys(const esp_partition_t *partition, nvs_sec_cfg_t *cfg)
Generate and store NVS keys in the provided esp partition.
Return -ESP_OK, if cfg was read successfully; -ESP_INVALID_ARG, if partition or cfg; -or error codes
from esp_partition_write/erase APIs.
Parameters
• [in] partition: Pointer to partition structure obtained using esp_partition_find_first or
esp_partition_get. Must be non-NULL.
• [out] cfg: Pointer to nvs security configuration structure. Pointer must be non-NULL. Gener-
ated keys will be populated in this structure.
esp_err_t nvs_flash_read_security_cfg(const esp_partition_t *partition, nvs_sec_cfg_t *cfg)
Read NVS security configuration from a partition.
Note Provided partition is assumed to be marked ‘encrypted’.
Return -ESP_OK, if cfg was read successfully; -ESP_INVALID_ARG, if partition or cfg; -
ESP_ERR_NVS_KEYS_NOT_INITIALIZED, if the partition is not yet written with keys. -
ESP_ERR_NVS_CORRUPT_KEY_PART, if the partition containing keys is found to be corrupt -or
error codes from esp_partition_read API.
Parameters
• [in] partition: Pointer to partition structure obtained using esp_partition_find_first or
esp_partition_get. Must be non-NULL.
• [out] cfg: Pointer to nvs security configuration structure. Pointer must be non-NULL.
Espressif Systems 714
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