core_esp8266_flash_utils.c

/* 
 core_esp8266_flash_utils.c - flash and binary image helpers

 Copyright (c) 2015 Ivan Grokhotkov. All rights reserved.
 This file is part of the esp8266 core for Arduino environment.
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */


#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "flash_utils.h"


int SPIEraseAreaEx(const uint32_t start, const uint32_t size)
{
    if ((start & (FLASH_SECTOR_SIZE - 1)) != 0) {
        return 1;
    }

    const uint32_t sectors_per_block = FLASH_BLOCK_SIZE / FLASH_SECTOR_SIZE;
    uint32_t current_sector = start / FLASH_SECTOR_SIZE;
    uint32_t sector_count = (size + FLASH_SECTOR_SIZE - 1) / FLASH_SECTOR_SIZE;
    const uint32_t end = current_sector + sector_count;

    for (; current_sector < end && (current_sector & (sectors_per_block-1)); 
        ++current_sector, --sector_count) {
        if (SPIEraseSector(current_sector)) {
            return 2;
        }
    }

    for (;current_sector + sectors_per_block <= end; 
        current_sector += sectors_per_block, 
        sector_count -= sectors_per_block) {
        if (SPIEraseBlock(current_sector / sectors_per_block)) {
            return 3;
        }
    }

    for (; current_sector < end; 
        ++current_sector, --sector_count) {
        if (SPIEraseSector(current_sector)) {
            return 4;
        }
    }

    return 0;
}