80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/**
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* This file is part of the Status project, https://status.im/
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*
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* Copyright (c) 2018 Status Research & Development GmbH
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef FLASH_H_
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#define FLASH_H_
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#include "sys.h"
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// The values below come from the ST DM00083560 document. They might need to be changed if the MCU is swapped for a different part
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#define FLASH_KEYR1 0x45670123
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#define FLASH_KEYR2 0xCDEF89AB
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#define FLASH_OPTKEYR1 0x08192A3B
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#define FLASH_OPTKEYR2 0x4C5D6E7F
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#define FLASH_BANK1 0
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#define FLASH_BANK2 1
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#define RDP2 0xcc
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#define FLASH_IS_RDP2() ((FLASH->OPTR & 0xff) == RDP2)
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#define FLASH_SET_RDP2() FLASH->OPTR |= RDP2
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#define FLASH_WP(reg, start, end) reg = (0xFF00FF00 | end << 16 | start)
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/**
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* Unlocks the flash, allowing writing.
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*/
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int flash_unlock();
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/**
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* Erases `page_count` pages, starting from `page` in the given `bank`. Since this function is only called using constant values, the input parameters are not validated.
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*/
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int flash_erase(uint8_t bank, uint8_t page, uint8_t page_count);
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/**
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* Copies `size` words from `src` to `dst`. Since this function is only called using constant values and previously checked values, the input parameters are not validated. The addresses must be aligned according
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* to the rules specified in the ST DM00083560 document.
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*/
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int flash_copy(uint32_t* src, __IO uint32_t* dst, uint32_t size);
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/**
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* Locks the flash again, preventing writing.
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*/
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int flash_lock();
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/**
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* Unlock the option bytes
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*/
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int flash_optunlock();
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/**
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* Write and reload the option bytes
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*/
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void flash_optprogram();
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#endif /* FLASH_H_ */
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