forked from Imagelibrary/rtems
123 lines
4.6 KiB
C
123 lines
4.6 KiB
C
/* ---------------------------------------------------------------------------- */
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/* Atmel Microcontroller Software Support */
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/* SAM Software Package License */
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/* ---------------------------------------------------------------------------- */
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/* Copyright (c) 2015, Atmel Corporation */
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/* */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without */
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/* modification, are permitted provided that the following condition is met: */
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/* */
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/* - Redistributions of source code must retain the above copyright notice, */
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/* this list of conditions and the disclaimer below. */
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/* */
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/* Atmel's name may not be used to endorse or promote products derived from */
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/* this software without specific prior written permission. */
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/* */
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/* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR */
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/* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE */
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/* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, */
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/* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
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/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
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/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */
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/* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
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/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
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/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* ---------------------------------------------------------------------------- */
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/** \addtogroup rtng_module Working with RTNG
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* \ingroup peripherals_module
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* The TRNG driver provides the interface to configure and use the TRNG
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* peripheral.\n
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*
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* The True Random Number Generator (TRNG) passes the American NIST Special
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* Publication 800-22 and Diehard Random Tests Suites. As soon as the TRNG is
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* enabled (TRNG_Enable()), the generator provides one 32-bit value every 84
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* clock cycles. Interrupt trng_int can be enabled through TRNG_EnableIt()
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* (respectively disabled in TRNG_IDR).
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* This interrupt is set when a new random value is available and is cleared
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* when the status register is read (TRNG_SR register). The flag DATRDY of
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* the status register (TRNG_ISR) is set when the random data is ready to be
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* read out on the 32-bit output data through TRNG_GetRandData().
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*
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* For more accurate information, please look at the SHA section of the
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* Datasheet.
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*
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* Related files :\n
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* \ref trng.c\n
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* \ref trng.h\n
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*/
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/*@{*/
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/*@}*/
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/**
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* \file
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*
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* Implementation of True Random Number Generator (TRNG)
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*
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*/
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/*----------------------------------------------------------------------------
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* Headers
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*----------------------------------------------------------------------------*/
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#include "chip.h"
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/*----------------------------------------------------------------------------
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* Exported functions
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*----------------------------------------------------------------------------*/
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/**
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* \brief Enables the TRNG to provide Random Values.
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* \param key This key is to be written when the ENABLE bit is set.
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*/
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void TRNG_Enable(void)
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{
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TRNG->TRNG_CR = TRNG_CR_ENABLE | TRNG_CR_KEY_PASSWD;
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}
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/**
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* \brief Disables the TRNG to provide Random Values.
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* \param key This key is to be written when the DISABLE bit is set.
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*/
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void TRNG_Disable(void)
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{
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TRNG->TRNG_CR = TRNG_CR_KEY_PASSWD;
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}
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/**
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* \brief Data Ready Interrupt enable.
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*/
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void TRNG_EnableIt(void)
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{
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TRNG->TRNG_IER = TRNG_IER_DATRDY;
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}
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/**
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* \brief Data Ready Interrupt Disable.
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*/
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void TRNG_DisableIt(void)
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{
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TRNG->TRNG_IDR = TRNG_IDR_DATRDY;
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}
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/**
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* \brief Get the current status register of the given TRNG peripheral.
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* \return TRNG status register.
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*/
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uint32_t TRNG_GetStatus(void)
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{
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return TRNG->TRNG_ISR;
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}
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/**
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* \brief Get the 32-bit Output Data from TRNG peripheral.
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* \return TRNG output data.
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*/
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uint32_t TRNG_GetRandData(void)
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{
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return TRNG->TRNG_ODATA;
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}
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