99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
/***************************************************************************
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* Copyright (C) 2013 by Terraneo Federico *
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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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#ifndef RNG_H
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#define RNG_H
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#include "interfaces/arch_registers.h"
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#include "kernel/sync.h"
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namespace miosix {
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/**
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* Class to access the hardware random number generator in Miosix
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* Works with the hardware RNG in stm32f2 and stm32f4
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*/
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class HardwareRng
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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 HardwareRng& instance();
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/**
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* \return a 32 bit random number
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* \throws runtime_error if the self test is not passed
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*/
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unsigned int get();
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/**
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* Fill a buffer with random data
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* \param buf buffer to be filled
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* \param size buffer size
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* \throws runtime_error if the self test is not passed
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*/
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void get(void *buf, unsigned int size);
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private:
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HardwareRng(const HardwareRng&);
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HardwareRng& operator=(const HardwareRng&);
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/**
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* Constructor
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*/
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HardwareRng() : old(0)
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{
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miosix::FastInterruptDisableLock dLock;
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RCC->AHB2ENR |= RCC_AHB2ENR_RNGEN;
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RCC_SYNC();
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}
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/**
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* \return a 32 bit random number
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* \throws runtime_error if the self test is not passed
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*/
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unsigned int getImpl();
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/**
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* To save power, enable the peripheral ony when requested
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*/
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class PeripheralEnable
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{
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public:
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PeripheralEnable() { RNG->CR=RNG_CR_RNGEN; }
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~PeripheralEnable() { RNG->CR=0; }
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};
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miosix::FastMutex mutex; ///< To protect against concurrent access
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unsigned int old; ///< Previously read value
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};
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} //namespace miosix
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#endif //RNG_H
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