esp-idf/components/bootloader_support/include_bootloader/bootloader_utility.h

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// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include "bootloader_config.h"
#include "esp_image_format.h"
/**
* @brief Load partition table.
*
* Parse partition table, get useful data such as location of
* OTA data partition, factory app partition, and test app partition.
*
* @param[out] bs Bootloader state structure used to save read data.
* @return Return true if the partition table was succesfully loaded and MD5 checksum is valid.
*/
bool bootloader_utility_load_partition_table(bootloader_state_t* bs);
/**
* @brief Return the index of the selected boot partition.
*
* This is the preferred boot partition, as determined by the partition table &
* any OTA sequence number found in OTA data.
* This partition will only be booted if it contains a valid app image, otherwise load_boot_image() will search
* for a valid partition using this selection as the starting point.
*
* @param[in] bs Bootloader state structure.
* @return Returns the index on success, INVALID_INDEX otherwise.
*/
int bootloader_utility_get_selected_boot_partition(const bootloader_state_t *bs);
/**
* @brief Load the selected partition and start application.
*
* Start from partition 'start_index', if not bootable then work backwards to FACTORY_INDEX
* (ie try any OTA slots in descending order and then the factory partition).
* If still nothing, start from 'start_index + 1' and work up to highest numbered OTA partition.
* If still nothing, try TEST_APP_INDEX.
* Everything this function calls must be located in the iram_loader_seg segment.
*
* @param[in] bs Bootloader state structure.
* @param[in] start_index The index from which the search for images begins.
*/
__attribute__((noreturn)) void bootloader_utility_load_boot_image(const bootloader_state_t *bs, int start_index);
/**
* @brief Software reset the ESP32
*
* Bootloader code should call this in the case that it cannot proceed.
*
* It is not recommended to call this function from an app (if called, the app will abort).
*/
__attribute__((noreturn)) void bootloader_reset(void);
/**
* @brief Converts an array to a printable string.
*
* This function is useful for printing SHA-256 digest.
* \code{c}
* // Example of using. image_hash will be printed
* #define HASH_LEN 32 // SHA-256 digest length
* ...
* char hash_print[HASH_LEN * 2 + 1];
* hash_print[HASH_LEN * 2] = 0;
* bootloader_sha256_hex_to_str(hash_print, image_hash, HASH_LEN);
* ESP_LOGI(TAG, %s", hash_print);
* \endcode
* @param[out] out_str Output string
* @param[in] in_array_hex Pointer to input array
* @param[in] len Length of input array
*
* @return ESP_OK: Successful
* ESP_ERR_INVALID_ARG: Error in the passed arguments
*/
esp_err_t bootloader_sha256_hex_to_str(char *out_str, const uint8_t *in_array_hex, size_t len);