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52d84b1ead
* Add a CRC32 over progmem and ESP.checkFlashCRC Automatically embed a CRC32 of the program memory (including bootloader but excluding any filesystems) in all images in unused space in the bootloader block. Add a call, ESP.checkFlashCRC() which returns false if the calculated CRC doesn't match the one stored in the image (i.e. flash corruption). Fixes #4165 * Add example that corrupts itself, comments Show CRC checking catch a 1-bit error in program code by corrupting a large array, and then return it to clean and verify the CRC matches once again. Add comments to the CRC check routine Clean up pylint complaints on crc32bin.py * Check linker script for CRC space in bootsector Add an assertion in the eboot linker file to guarantee that we have at least 8 bytes of unused space at the end of the boot sector to patch in the CRC. If not, the eboot link will fail. * Add note about what to do if CRC check fails Per discussion with @d-a-v. When the CRC check fails, you could *try* to do certain things (but may not succeed since there is known flash corruption at that point). List a few ideas for application authors. * Only single, flash/ram friendly crc32() function * Combine the CRC calc and bin generation in 1 step Per discussion w/@mcspr, combine the CRC calculation with the binary generation, removing the additional build step.
44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
/*
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crc32.cpp
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Copyright (c) 2015 Ivan Grokhotkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "coredecls.h"
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#include "pgmspace.h"
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// moved from core_esp8266_eboot_command.cpp
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uint32_t crc32 (const void* data, size_t length, uint32_t crc /*= 0xffffffff*/)
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{
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const uint8_t* ldata = (const uint8_t*)data;
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while (length--)
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{
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uint8_t c = pgm_read_byte(ldata++);
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for (uint32_t i = 0x80; i > 0; i >>= 1)
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{
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bool bit = crc & 0x80000000;
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if (c & i)
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bit = !bit;
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crc <<= 1;
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if (bit)
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crc ^= 0x04c11db7;
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}
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}
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return crc;
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}
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