参见文档：esp-idf/components/nvs_flash/include/nvs.h
c
#define ESP_ERR_NVS_BASE 0x1100 /*!< Starting number of error codes */
#define ESP_ERR_NVS_NOT_INITIALIZED (ESP_ERR_NVS_BASE + 0x01) /*!< The storage driver is not initialized */
#define ESP_ERR_NVS_NOT_FOUND (ESP_ERR_NVS_BASE + 0x02) /*!< A requested entry couldn't be found or namespace doesn't exist yet and mode is NVS_READONLY */
#define ESP_ERR_NVS_TYPE_MISMATCH (ESP_ERR_NVS_BASE + 0x03) /*!< The type of set or get operation doesn't match the type of value stored in NVS */
#define ESP_ERR_NVS_READ_ONLY (ESP_ERR_NVS_BASE + 0x04) /*!< Storage handle was opened as read only */
#define ESP_ERR_NVS_NOT_ENOUGH_SPACE (ESP_ERR_NVS_BASE + 0x05) /*!< There is not enough space in the underlying storage to save the value */
#define ESP_ERR_NVS_INVALID_NAME (ESP_ERR_NVS_BASE + 0x06) /*!< Namespace name doesn't satisfy constraints */
#define ESP_ERR_NVS_INVALID_HANDLE (ESP_ERR_NVS_BASE + 0x07) /*!< Handle has been closed or is NULL */
#define ESP_ERR_NVS_REMOVE_FAILED (ESP_ERR_NVS_BASE + 0x08) /*!< The value wasn't updated because flash write operation has failed. The value was written however, and update will be finished after re-initialization of nvs, provided that flash operation doesn't fail again. */
#define ESP_ERR_NVS_KEY_TOO_LONG (ESP_ERR_NVS_BASE + 0x09) /*!< Key name is too long */
#define ESP_ERR_NVS_PAGE_FULL (ESP_ERR_NVS_BASE + 0x0a) /*!< Internal error; never returned by nvs API functions */
#define ESP_ERR_NVS_INVALID_STATE (ESP_ERR_NVS_BASE + 0x0b) /*!< NVS is in an inconsistent state due to a previous error. Call nvs_flash_init and nvs_open again, then retry. */
#define ESP_ERR_NVS_INVALID_LENGTH (ESP_ERR_NVS_BASE + 0x0c) /*!< String or blob length is not sufficient to store data */
#define ESP_ERR_NVS_NO_FREE_PAGES (ESP_ERR_NVS_BASE + 0x0d) /*!< NVS partition doesn't contain any empty pages. This may happen if NVS partition was truncated. Erase the whole partition and call nvs_flash_init again. */
#define ESP_ERR_NVS_VALUE_TOO_LONG (ESP_ERR_NVS_BASE + 0x0e) /*!< Value doesn't fit into the entry or string or blob length is longer than supported by the implementation */
#define ESP_ERR_NVS_PART_NOT_FOUND (ESP_ERR_NVS_BASE + 0x0f) /*!< Partition with specified name is not found in the partition table */
#define ESP_ERR_NVS_NEW_VERSION_FOUND (ESP_ERR_NVS_BASE + 0x10) /*!< NVS partition contains data in new format and cannot be recognized by this version of code */
#define ESP_ERR_NVS_XTS_ENCR_FAILED (ESP_ERR_NVS_BASE + 0x11) /*!< XTS encryption failed while writing NVS entry */
#define ESP_ERR_NVS_XTS_DECR_FAILED (ESP_ERR_NVS_BASE + 0x12) /*!< XTS decryption failed while reading NVS entry */
#define ESP_ERR_NVS_XTS_CFG_FAILED (ESP_ERR_NVS_BASE + 0x13) /*!< XTS configuration setting failed */
#define ESP_ERR_NVS_XTS_CFG_NOT_FOUND (ESP_ERR_NVS_BASE + 0x14) /*!< XTS configuration not found */
#define ESP_ERR_NVS_ENCR_NOT_SUPPORTED (ESP_ERR_NVS_BASE + 0x15) /*!< NVS encryption is not supported in this version */
#define ESP_ERR_NVS_KEYS_NOT_INITIALIZED (ESP_ERR_NVS_BASE + 0x16) /*!< NVS key partition is uninitialized */
#define ESP_ERR_NVS_CORRUPT_KEY_PART (ESP_ERR_NVS_BASE + 0x17) /*!< NVS key partition is corrupt */
#define ESP_ERR_NVS_WRONG_ENCRYPTION (ESP_ERR_NVS_BASE + 0x19) /*!< NVS partition is marked as encrypted with generic flash encryption. This is forbidden since the NVS encryption works differently. */
#define ESP_ERR_NVS_CONTENT_DIFFERS (ESP_ERR_NVS_BASE + 0x18) /*!< Internal error; never returned by nvs API functions. NVS key is different in comparison */
#define NVS_DEFAULT_PART_NAME "nvs" /*!< Default partition name of the NVS partition in the partition table */
#define NVS_PART_NAME_MAX_SIZE 16 /*!< maximum length of partition name (excluding null terminator) */
#define NVS_KEY_NAME_MAX_SIZE 16 /*!< Maximum length of NVS key name (including null terminator) */
#define NVS_NS_NAME_MAX_SIZE NVS_KEY_NAME_MAX_SIZE /*!< Maximum length of NVS namespace name (including null terminator) */