kopia lustrzana https://github.com/OpenRTX/OpenRTX
Driver for random number generator peripheral
Silvano Seva
rodzic
9433f8735a
commit
7dc2ca5524
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@ -227,6 +227,7 @@ stm32f405_src = ['platform/mcu/STM32F4xx/boot/startup.cpp',
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'platform/mcu/STM32F4xx/drivers/SPI2.c',
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'platform/mcu/STM32F4xx/drivers/USART3.cpp',
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'platform/mcu/STM32F4xx/drivers/flash.c',
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'platform/mcu/STM32F4xx/drivers/rng.c',
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'platform/drivers/audio/stm32_dac.cpp',
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'platform/drivers/audio/stm32_adc.cpp',
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'platform/drivers/audio/stm32_pwm.cpp',
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@ -250,6 +251,7 @@ mk22fn512_src = ['platform/mcu/MK22FN512xxx12/boot/startup.cpp',
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'platform/mcu/MK22FN512xxx12/drivers/gpio.c',
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'platform/mcu/MK22FN512xxx12/drivers/delays.cpp',
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'platform/mcu/MK22FN512xxx12/drivers/I2C0.c',
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'platform/mcu/MK22FN512xxx12/drivers/rng.c',
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'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_cdc_acm.c',
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'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_ch9.c',
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'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_dci.c',
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@ -280,6 +282,7 @@ linux_platform_src = ['platform/targets/linux/emulator/emulator.c',
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'platform/drivers/NVM/nvmem_linux.c',
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'platform/drivers/GPS/GPS_linux.c',
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'platform/mcu/x86_64/drivers/delays.c',
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'platform/mcu/x86_64/drivers/rng.cpp',
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'platform/drivers/baseband/radio_linux.cpp',
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'platform/drivers/audio/audio_linux.c',
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'platform/targets/linux/platform.c',
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@ -0,0 +1,55 @@
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/***************************************************************************
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* Copyright (C) 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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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 3 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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* 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 <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Driver for Random Number Generator.
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*/
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/**
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* Initialise the RNG driver.
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*/
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void rng_init();
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/**
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* Shut down the RNG module.
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*/
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void rng_terminate();
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/**
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* Generate a 32 bit random number.
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*
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* @return random number.
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*/
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uint32_t rng_get();
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#ifdef __cplusplus
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}
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#endif
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#endif /* INTERFACES_GPS_H */
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@ -0,0 +1,41 @@
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/***************************************************************************
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* Copyright (C) 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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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 3 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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* 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 <peripherals/rng.h>
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#include <MK22F51212.h>
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void rng_init()
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{
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SIM->SCGC6 |= SIM_SCGC6_RNGA(1);
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RNG->CR |= RNG_CR_GO(1);
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}
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void rng_terminate()
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{
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SIM->SCGC6 &= ~SIM_SCGC6_RNGA(1);
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}
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uint32_t rng_get()
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{
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// Wait until there is some data
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while((RNG->SR & RNG_SR_OREG_LVL_MASK) == 0) ;
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return RNG->OR;
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}
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@ -0,0 +1,76 @@
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/***************************************************************************
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* Copyright (C) 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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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 3 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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* 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 <interfaces/delays.h>
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#include <peripherals/rng.h>
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#include <stm32f4xx.h>
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#include <pthread.h>
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static uint32_t oldValue = 0;
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void rng_init()
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{
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RCC->AHB2ENR |= RCC_AHB2ENR_RNGEN;
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__DSB();
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}
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void rng_terminate()
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{
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RCC->AHB2ENR &= ~RCC_AHB2ENR_RNGEN;
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__DSB();
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}
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uint32_t rng_get()
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{
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uint32_t value;
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RNG->CR = RNG_CR_RNGEN;
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/*
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* The datasheet says that the RNG takes 40 clock cycles of the 48MHz
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* clock to generate a number, that is around 0.83us. It has not much
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* sense to put a delay here, we can just spin a bit and wait.
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*/
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while(1)
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{
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uint32_t status = RNG->SR;
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// Got a new number, return it only if different from the previous one
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if((status & RNG_SR_DRDY) != 0)
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{
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value = RNG->DR;
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if(value != oldValue)
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break;
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}
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// Error, "power cycle" the RNG and retry
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if((status & (RNG_SR_SECS | RNG_SR_CECS)) != 0)
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{
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RNG->CR = 0;
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delayUs(1);
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RNG->CR = RNG_CR_RNGEN;
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}
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}
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RNG->CR = 0;
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oldValue = value;
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return value;
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}
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@ -0,0 +1,44 @@
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/***************************************************************************
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* Copyright (C) 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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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 3 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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* 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 <peripherals/rng.h>
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#include <random>
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#include <limits>
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static std::mt19937 rng;
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void rng_init()
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{
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std::random_device seed;
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rng.seed(seed());
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}
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void rng_terminate()
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{
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}
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uint32_t rng_get()
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{
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std::uniform_int_distribution< uint32_t >
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distribution(0, std::numeric_limits<uint32_t>::max());
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return distribution(rng);
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}
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