70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
// Copyright 2015-2016 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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// 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 __BOOTLOADER_FLASH_H
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#define __BOOTLOADER_FLASH_H
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <esp_err.h>
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/* Provide a Flash API for bootloader_support code,
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that can be used from bootloader or app code.
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This header is available to source code in the bootloader &
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bootloader_support components only.
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*/
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/**
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* @brief Map a region of flash to data memory
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*
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* @important In bootloader code, only one region can be bootloader_mmaped at once. The previous region must be bootloader_unmapped before another region is mapped.
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*
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* @important In app code, these functions are not thread safe.
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*
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* Call bootloader_unmap once for each successful call to bootloader_mmap.
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*
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* In esp-idf app, this function maps directly to spi_flash_mmap.
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*
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* @param offset - Starting flash offset to map to memory.
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* @param length - Length of data to map.
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*
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* @return Pointer to mapped data memory (at src_addr), or NULL
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* if an allocation error occured.
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*/
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const void *bootloader_mmap(uint32_t src_addr, uint32_t size);
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/**
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* @brief Unmap a previously mapped region of flash
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*
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* Call bootloader_unmap once for each successful call to bootloader_mmap.
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*/
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void bootloader_unmap(const void *mapping);
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/**
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* @brief Read data from Flash.
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*
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* @note Both src and dest have to be 4-byte aligned.
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*
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* @param src source address of the data in Flash.
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* @param dest pointer to the destination buffer
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* @param size length of data
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*
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* @return esp_err_t
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*/
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esp_err_t bootloader_flash_read(size_t src_addr, void *dest, size_t size);
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#endif
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