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76 lines
3.9 KiB
ReStructuredText
76 lines
3.9 KiB
ReStructuredText
Migrate Storage to ESP-IDF 5.0
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==================================
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Breaking changes:
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~~~~~~~~~~~~~~~~~
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f_mkfs() signature change in FATFS v0.14
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----------------------------------------
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New signature is ``FRESULT f_mkfs (const TCHAR* path, const MKFS_PARM* opt, void* work, UINT len);`` which now uses ``MKFS_PARM`` struct as a second argument.
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Partition table generation no longer supports misaligned partitions
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-------------------------------------------------------------------
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When generating a partiton table, ``esp-idf`` will no longer accept partitions which offset does not align to 4kB. This change only affects generating new partition tables, reading and writing to already existing partitions remains unchanged.
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esp_vfs_semihost_register() signature change
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--------------------------------------------
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New signature is ``esp_err_t esp_vfs_semihost_register(const char* base_path);`` Absolute path as a second parameter will no longer in use. Instead, the OpenOCD command ``ESP_SEMIHOST_BASEDIR`` should be used to set the full path on the host.
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NVS
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---
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``nvs_entry_find()``, ``nvs_entry_next()`` and ``nvs_entry_info()`` always return ``esp_err_t`` now instead of ``void`` or ``nvs_iterator_t``. This provides better error reporting when parameters are invalid or something goes wrong internally than returning ``nullptr`` instead of a valid iterator or checking parameters with ``assert``. ``nvs_entry_find()`` and ``nvs_entry_next()`` modify iterators via parameters now instead of returning an iterator.
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The old programming pattern to iterate over an NVS partition was as follows:
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.. highlight:: c
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::
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nvs_iterator_t it = nvs_entry_find(<nvs_partition_name>, <namespace>, NVS_TYPE_ANY);
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while (it != NULL) {
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nvs_entry_info_t info;
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nvs_entry_info(it, &info);
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it = nvs_entry_next(it);
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printf("key '%s', type '%d' \n", info.key, info.type);
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};
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The new programming pattern to iterate over an NVS partition is now:
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.. highlight:: c
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::
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nvs_iterator_t it = nullptr;
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esp_err_t res = nvs_entry_find(<nvs_partition_name>, <namespace>, NVS_TYPE_ANY, &it);
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while(res == ESP_OK) {
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nvs_entry_info_t info;
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nvs_entry_info(it, &info); // Can omit error check if parameters are guaranteed to be non-NULL
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printf("key '%s', type '%d' \n", info.key, info.type);
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res = nvs_entry_next(&it);
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}
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nvs_release_iterator(it);
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Signature Changes
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^^^^^^^^^^^^^^^^^
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``nvs_iterator_t nvs_entry_find(const char *part_name, const char *namespace_name, nvs_type_t type)`` changes to ``esp_err_t nvs_entry_find(const char *part_name, const char *namespace_name, nvs_type_t type, nvs_iterator_t *output_iterator)``. The iterator is returned via the parameter ``output_iterator`` instead of a return value. This allows reporting additional errors, like e.g. memory errors, via the new return value.
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``nvs_iterator_t nvs_entry_next(nvs_iterator_t iterator)`` changes to ``esp_err_t nvs_entry_next(nvs_iterator_t *it)``. This allows reporting parameter errors and internal errors, like e.g. flash errors.
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``void nvs_entry_info(nvs_iterator_t iterator, nvs_entry_info_t *out_info)`` changes to ``esp_err_t nvs_entry_info(const nvs_iterator_t iterator, nvs_entry_info_t *out_info)`` to allow reporting parameter errors.
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Iterator Validity
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^^^^^^^^^^^^^^^^^
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Note that due to the new signatures, it is possible to have an invalid iterator from ``nvs_entry_find()``, if there is a parameter errors. Hence, it is important to initialize the iterator with ``NULL`` before using ``nvs_entry_find()`` to avoid complex error checking before calling ``nvs_release_iterator()``. A good example is the programming pattern above.
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Removed SDSPI deprecated API
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----------------------------
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Removed structure ``sdspi_slot_config_t`` and fuction ``sdspi_host_init_slot``. These were replaced by a structure ``sdspi_device_config_t`` and a fuction ``sdspi_host_init_device`` respectively.
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