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docs(nvs_flash): correct public API docs for error code

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-align nvs.h / nvs_handle.hpp Doxygen with the implementation: fix return codes
-guard nvs_open against a NULL out_handle
This commit is contained in:
radek.tandler
2026-09-02 14:57:15 +02:00
parent cb709dbf27
commit c3fc203f8a
3 changed files with 84 additions and 64 deletions
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components/nvs_flash/include/nvs.h
+43 -25
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@@ -154,9 +154,9 @@ typedef struct nvs_opaque_iterator_t *nvs_iterator_t;
* NVS partition (only if NVS assertion checks are disabled)
* - ESP_ERR_NVS_NOT_INITIALIZED if the storage driver is not initialized
* - ESP_ERR_NVS_PART_NOT_FOUND if the partition with label "nvs" is not found
* - ESP_ERR_NVS_NOT_FOUND id namespace doesn't exist yet and
* - ESP_ERR_NVS_NOT_FOUND if namespace doesn't exist yet and
* mode is NVS_READONLY
* - ESP_ERR_NVS_INVALID_NAME if namespace name doesn't satisfy constraints
* - ESP_ERR_NVS_KEY_TOO_LONG if the namespace name is longer than (NVS_KEY_NAME_MAX_SIZE-1) characters
* - ESP_ERR_NO_MEM in case memory could not be allocated for the internal structures
* - ESP_ERR_NVS_NOT_ENOUGH_SPACE if there is no space for a new entry or there are too many different
* namespaces (maximum allowed different namespaces: 254)
@@ -175,9 +175,12 @@ esp_err_t nvs_open(const char* namespace_name, nvs_open_mode_t open_mode, nvs_ha
*
* @param[in] part_name Label (name) of the partition of interest for object read/write/erase
* @param[in] namespace_name Namespace name. Maximum length is (NVS_KEY_NAME_MAX_SIZE-1) characters. Shouldn't be empty.
* @param[in] open_mode NVS_READWRITE or NVS_READONLY. If NVS_READONLY, will
* open a handle for reading only. All write requests will
* be rejected for this handle.
* @param[in] open_mode NVS_READONLY opens a read only handle
* NVS_READWRITE opens a read/write handle. erase and set operations are allowed.
* previous data is marked as deleted only and new data is written to a new location.
* NVS_READWRITE_PURGE opens a read/write handle. Update and erase operations are allowed.
* previous data is purged from flash memory to ensure that it cannot be recovered.
* New data is written to a new location.
* @param[out] out_handle If successful (return code is zero), handle will be
* returned in this argument.
*
@@ -187,9 +190,9 @@ esp_err_t nvs_open(const char* namespace_name, nvs_open_mode_t open_mode, nvs_ha
* NVS partition (only if NVS assertion checks are disabled)
* - ESP_ERR_NVS_NOT_INITIALIZED if the storage driver is not initialized
* - ESP_ERR_NVS_PART_NOT_FOUND if the partition with specified name is not found
* - ESP_ERR_NVS_NOT_FOUND id namespace doesn't exist yet and
* - ESP_ERR_NVS_NOT_FOUND if namespace doesn't exist yet and
* mode is NVS_READONLY
* - ESP_ERR_NVS_INVALID_NAME if namespace name doesn't satisfy constraints
* - ESP_ERR_NVS_KEY_TOO_LONG if the namespace name is longer than (NVS_KEY_NAME_MAX_SIZE-1) characters
* - ESP_ERR_NO_MEM in case memory could not be allocated for the internal structures
* - ESP_ERR_NVS_NOT_ENOUGH_SPACE if there is no space for a new entry or there are too many different
* namespaces (maximum allowed different namespaces: 254)
@@ -220,7 +223,7 @@ esp_err_t nvs_open_from_partition(const char *part_name, const char* namespace_n
* NVS partition (only if NVS assertion checks are disabled)
* - ESP_ERR_NVS_INVALID_HANDLE if handle has been closed or is NULL
* - ESP_ERR_NVS_READ_ONLY if storage handle was opened as read only
* - ESP_ERR_NVS_INVALID_NAME if key name doesn't satisfy constraints
* - ESP_ERR_NVS_KEY_TOO_LONG if the key name is longer than (NVS_KEY_NAME_MAX_SIZE-1) characters
* - ESP_ERR_NVS_NOT_ENOUGH_SPACE if there is not enough space in the
* underlying storage to save the value
* - ESP_ERR_NVS_REMOVE_FAILED if the value wasn't updated because flash
@@ -306,13 +309,17 @@ esp_err_t nvs_set_double (nvs_handle_t handle, const char* key, double value);
/**
* @brief set string for given key
*
* Sets string value for the key. Function requires whole space for new data to be available
* as contiguous entries in same nvs page. Operation consumes 1 overhead entry and 1 entry per
* each 32 characters of new string including zero character to be set. In case of value update
* for existing key, entries occupied by the previous value and overhead entry are returned to
* the pool of available entries.
* Sets string value for the key. The whole string (including the null terminator) must fit as a
* contiguous run of entries on a single NVS page. The operation consumes 1 overhead (metadata)
* entry plus \c ceil((strlen(value) + 1) / 32) data entries.
*
* On update, the new value is written first and the previous value is erased afterwards, so free
* space for the new value is required regardless of the size of the old one. Entries occupied by
* the previous value become available only for subsequent operations (and only after page reclaim).
*
* Note that storage of long string values can fail due to fragmentation of nvs pages even if
* \c available_entries returned by \c nvs_get_stats suggests enough overall space available.
* See the NVS documentation section "Space Consumption" for details.
* Note that the underlying storage will not be updated until \c nvs_commit is called.
*
*
@@ -326,9 +333,11 @@ esp_err_t nvs_set_double (nvs_handle_t handle, const char* key, double value);
*
* @return
* - ESP_OK if value was set successfully
* - ESP_FAIL if there is an internal error; most likely due to corrupted
* NVS partition (only if NVS assertion checks are disabled)
* - ESP_ERR_NVS_INVALID_HANDLE if handle has been closed or is NULL
* - ESP_ERR_NVS_READ_ONLY if storage handle was opened as read only
* - ESP_ERR_NVS_INVALID_NAME if key name doesn't satisfy constraints
* - ESP_ERR_NVS_KEY_TOO_LONG if the key name is longer than (NVS_KEY_NAME_MAX_SIZE-1) characters
* - ESP_ERR_NVS_NOT_ENOUGH_SPACE if there is not enough space in the
* underlying storage to save the value
* - ESP_ERR_NVS_REMOVE_FAILED if the value wasn't updated because flash
@@ -343,10 +352,19 @@ esp_err_t nvs_set_str (nvs_handle_t handle, const char* key, const char* value);
/**
* @brief set variable length binary value for given key
*
* Sets variable length binary value for the key. Function uses 2 overhead and 1 entry
* per each 32 bytes of new data from the pool of available entries. See \c nvs_get_stats .
* In case of value update for existing key, space occupied by the existing value and 2 overhead entries
* are returned to the pool of available entries.
* Sets variable length binary value for the key. A blob is stored as one \c BLOB_INDEX entry plus
* one or more data chunks (each chunk is a \c BLOB_DATA header entry followed by its payload
* entries, on a separate page). Storing a blob therefore needs
* \c 1 + k + ceil(length / 32) entries, where \c k is the number of chunks/pages used. The
* overhead is exactly 2 entries only when the blob fits in a single chunk; fragmentation
* increases \c k. See \c nvs_get_stats and the NVS documentation section "Space Consumption".
*
* On update, the new value is written first and the previous value is erased afterwards, so free
* space for the new value is required regardless of the size of the old one. Entries occupied by
* the previous value become available only for subsequent operations (and only after page reclaim).
*
* Note that storage of large blobs can fail due to fragmentation of nvs pages even if
* \c available_entries returned by \c nvs_get_stats suggests enough overall space available.
* Note that the underlying storage will not be updated until \c nvs_commit is called.
*
* @param[in] handle Handle obtained from nvs_open function.
@@ -363,7 +381,7 @@ esp_err_t nvs_set_str (nvs_handle_t handle, const char* key, const char* value);
* NVS partition (only if NVS assertion checks are disabled)
* - ESP_ERR_NVS_INVALID_HANDLE if handle has been closed or is NULL
* - ESP_ERR_NVS_READ_ONLY if storage handle was opened as read only
* - ESP_ERR_NVS_INVALID_NAME if key name doesn't satisfy constraints
* - ESP_ERR_NVS_KEY_TOO_LONG if the key name is longer than (NVS_KEY_NAME_MAX_SIZE-1) characters
* - ESP_ERR_NVS_NOT_ENOUGH_SPACE if there is not enough space in the
* underlying storage to save the value
* - ESP_ERR_NVS_REMOVE_FAILED if the value wasn't updated because flash
@@ -410,6 +428,7 @@ esp_err_t nvs_set_blob(nvs_handle_t handle, const char* key, const void* value,
* - ESP_ERR_NVS_INVALID_HANDLE if handle has been closed or is NULL
* - ESP_ERR_NVS_INVALID_NAME if key name doesn't satisfy constraints
* - ESP_ERR_NVS_INVALID_LENGTH if length is not sufficient to store data
* - ESP_ERR_NVS_TYPE_MISMATCH if the type of the stored value doesn't match the requested type
*/
esp_err_t nvs_get_i8 (nvs_handle_t handle, const char* key, int8_t* out_value);
@@ -531,7 +550,7 @@ esp_err_t nvs_get_double (nvs_handle_t handle, const char* key, double* out_valu
* NVS partition (only if NVS assertion checks are disabled)
* - ESP_ERR_NVS_NOT_FOUND if the requested key doesn't exist
* - ESP_ERR_NVS_INVALID_HANDLE if handle has been closed or is NULL
* - ESP_ERR_NVS_INVALID_NAME if key name doesn't satisfy constraints
* - ESP_ERR_NVS_TYPE_MISMATCH if the type of the stored value doesn't match the requested type
* - ESP_ERR_NVS_INVALID_LENGTH if \c length is not sufficient to store data
*/
esp_err_t nvs_get_str (nvs_handle_t handle, const char* key, char* out_value, size_t* length);
@@ -685,12 +704,11 @@ typedef struct {
* @return
* - ESP_OK if the changes have been written successfully.
* Return param nvs_stats will be filled.
* - ESP_ERR_NVS_PART_NOT_FOUND if the partition with label "name" is not found.
* Return param nvs_stats will be filled 0.
* - ESP_ERR_NVS_NOT_INITIALIZED if the storage driver is not initialized.
* Return param nvs_stats will be filled 0.
* - ESP_ERR_NVS_NOT_INITIALIZED if the storage driver is not initialized, or if the
* partition with label \c part_name is not found / not initialized.
* Return param nvs_stats will be filled with 0.
* - ESP_ERR_INVALID_ARG if nvs_stats is equal to NULL.
* - ESP_ERR_INVALID_STATE if there is page with the status of INVALID.
* - ESP_ERR_NVS_INVALID_STATE if there is a page with the status of INVALID.
* Return param nvs_stats will be filled not with correct values because
* not all pages will be counted. Counting will be interrupted at the first INVALID page.
*/