kopia lustrzana https://github.com/espressif/esp-idf
137 wiersze
4.6 KiB
C
137 wiersze
4.6 KiB
C
// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _wear_levelling_H_
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#define _wear_levelling_H_
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#include "esp_log.h"
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#include "esp_partition.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief wear levelling handle
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*/
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typedef int32_t wl_handle_t;
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#define WL_INVALID_HANDLE -1
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/**
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* @brief Mount WL for defined partition
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*
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* @param partition that will be used for access
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* @param out_handle handle of the WL instance
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*
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* @return
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* - ESP_OK, if the allocation was successfully;
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* - ESP_ERR_INVALID_ARG, if WL allocation was unsuccessful;
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* - ESP_ERR_NO_MEM, if there was no memory to allocate WL components;
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*/
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esp_err_t wl_mount(const esp_partition_t *partition, wl_handle_t *out_handle);
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/**
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* @brief Unmount WL for defined partition
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*
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* @param handle WL partition handle
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*
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* @return
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* - ESP_OK, if the operation completed successfully;
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* - or one of error codes from lower-level flash driver.
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*/
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esp_err_t wl_unmount(wl_handle_t handle);
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/**
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* @brief Erase part of the WL storage
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*
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* @param handle WL handle that are related to the partition
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* @param start_addr Address where erase operation should start. Must be aligned
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* to the result of function wl_sector_size(...).
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* @param size Size of the range which should be erased, in bytes.
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* Must be divisible by result of function wl_sector_size(...)..
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*
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* @return
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* - ESP_OK, if the range was erased successfully;
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* - ESP_ERR_INVALID_ARG, if iterator or dst are NULL;
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* - ESP_ERR_INVALID_SIZE, if erase would go out of bounds of the partition;
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* - or one of error codes from lower-level flash driver.
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*/
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esp_err_t wl_erase_range(wl_handle_t handle, size_t start_addr, size_t size);
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/**
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* @brief Write data to the WL storage
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*
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* Before writing data to flash, corresponding region of flash needs to be erased.
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* This can be done using wl_erase_range function.
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*
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* @param handle WL handle that are related to the partition
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* @param dest_addr Address where the data should be written, relative to the
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* beginning of the partition.
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* @param src Pointer to the source buffer. Pointer must be non-NULL and
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* buffer must be at least 'size' bytes long.
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* @param size Size of data to be written, in bytes.
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*
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* @note Prior to writing to WL storage, make sure it has been erased with
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* wl_erase_range call.
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*
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* @return
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* - ESP_OK, if data was written successfully;
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* - ESP_ERR_INVALID_ARG, if dst_offset exceeds partition size;
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* - ESP_ERR_INVALID_SIZE, if write would go out of bounds of the partition;
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* - or one of error codes from lower-level flash driver.
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*/
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esp_err_t wl_write(wl_handle_t handle, size_t dest_addr, const void *src, size_t size);
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/**
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* @brief Read data from the WL storage
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*
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* @param handle WL module instance that was initialized before
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* @param dest Pointer to the buffer where data should be stored.
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* Pointer must be non-NULL and buffer must be at least 'size' bytes long.
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* @param src_addr Address of the data to be read, relative to the
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* beginning of the partition.
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* @param size Size of data to be read, in bytes.
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*
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* @return
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* - ESP_OK, if data was read successfully;
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* - ESP_ERR_INVALID_ARG, if src_offset exceeds partition size;
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* - ESP_ERR_INVALID_SIZE, if read would go out of bounds of the partition;
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* - or one of error codes from lower-level flash driver.
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*/
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esp_err_t wl_read(wl_handle_t handle, size_t src_addr, void *dest, size_t size);
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/**
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* @brief Get size of the WL storage
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*
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* @param handle WL module handle that was initialized before
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* @return usable size, in bytes
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*/
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size_t wl_size(wl_handle_t handle);
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/**
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* @brief Get sector size of the WL instance
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*
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* @param handle WL module handle that was initialized before
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* @return sector size, in bytes
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*/
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size_t wl_sector_size(wl_handle_t handle);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // _wear_levelling_H_
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