91 lines
3.3 KiB
C++
91 lines
3.3 KiB
C++
/***************************************************************************
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* Copyright (C) 2017 by Matteo Michele Piazzolla *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program 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 *
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* GNU General Public License for more details. *
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* *
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* As a special exception, if other files instantiate templates or use *
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* macros or inline functions from this file, or you compile this file *
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* and link it with other works to produce a work based on this file, *
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* this file does not by itself cause the resulting work to be covered *
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* by the GNU General Public License. However the source code for this *
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* file must still be made available in accordance with the GNU General *
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* Public License. This exception does not invalidate any other reasons *
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* why a work based on this file might be covered by the GNU General *
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* Public License. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include "board_settings.h"
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#define PRESERVE __attribute__((section(".preserve")))
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namespace miosix {
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/**
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* Possible causes for an STM32 reset
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*/
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enum ResetReason
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{
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RST_LOW_PWR=0,
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RST_WINDOW_WDG=1,
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RST_INDEPENDENT_WDG=2,
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RST_SW=3,
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RST_POWER_ON=4,
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RST_PIN=5,
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RST_UNKNOWN=6,
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};
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/**
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* Driver for the STM32F2 and STM32F4 backup SRAM, here used as
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* SafeGuard Memory, that is, a memory whose value is preseved across resets.
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*/
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class SGM
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{
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public:
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/**
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* \return an instance of this class (singleton)
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*/
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static SGM& instance();
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/**
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* Temporarily disable writing to the safeguard memory.
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* By deafult, from reset to when the contrsuctor of this class is called
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* the safeguard memory is not writable. After the constructor is called,
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* the safeguard memory is writable.
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*/
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void disableWrite();
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/**
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* Make the safeguard memory writable again, after a call to disableWrite()
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*/
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void enableWrite();
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/**
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* Return the cause of the last reset of the microcontroller
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*/
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ResetReason lastResetReason() { return lastReset; }
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private:
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ResetReason lastReset;
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SGM(const SGM&)=delete;
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SGM& operator=(const SGM&)=delete;
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SGM();
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void readResetRegister();
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void clearResetFlag();
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};
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} |