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113 lines
4.5 KiB
C
113 lines
4.5 KiB
C
/******************************************************************************
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* Filename: trng.c
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* Revised: 2017-04-26 18:27:45 +0200 (Wed, 26 Apr 2017)
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* Revision: 48852
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*
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* Description: Driver for the TRNG module
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*
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* Copyright (c) 2015 - 2017, Texas Instruments Incorporated
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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 conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of the ORGANIZATION nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************/
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#include "trng.h"
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//*****************************************************************************
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//
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// Handle support for DriverLib in ROM:
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// This section will undo prototype renaming made in the header file
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//
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//*****************************************************************************
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#if !defined(DOXYGEN)
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#undef TRNGConfigure
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#define TRNGConfigure NOROM_TRNGConfigure
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#undef TRNGNumberGet
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#define TRNGNumberGet NOROM_TRNGNumberGet
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#endif
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//*****************************************************************************
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//
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// Configure the true random number generator
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//
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//*****************************************************************************
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void
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TRNGConfigure(uint32_t ui32MinSamplesPerCycle,
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uint32_t ui32MaxSamplesPerCycle,
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uint32_t ui32ClocksPerSample)
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{
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uint32_t ui32Val;
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// Make sure the TRNG is disabled.
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ui32Val = HWREG(TRNG_BASE + TRNG_O_CTL) & ~TRNG_CTL_TRNG_EN;
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HWREG(TRNG_BASE + TRNG_O_CTL) = ui32Val;
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// Configure the startup number of samples.
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ui32Val &= ~TRNG_CTL_STARTUP_CYCLES_M;
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ui32Val |= ((( ui32MaxSamplesPerCycle >> 8 ) << TRNG_CTL_STARTUP_CYCLES_S ) & TRNG_CTL_STARTUP_CYCLES_M );
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HWREG(TRNG_BASE + TRNG_O_CTL) = ui32Val;
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// Configure the minimum and maximum number of samples pr generated number
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// and the number of clocks per sample.
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HWREG(TRNG_BASE + TRNG_O_CFG0) = (
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((( ui32MaxSamplesPerCycle >> 8 ) << TRNG_CFG0_MAX_REFILL_CYCLES_S ) & TRNG_CFG0_MAX_REFILL_CYCLES_M ) |
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((( ui32ClocksPerSample ) << TRNG_CFG0_SMPL_DIV_S ) & TRNG_CFG0_SMPL_DIV_M ) |
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((( ui32MinSamplesPerCycle >> 6 ) << TRNG_CFG0_MIN_REFILL_CYCLES_S ) & TRNG_CFG0_MIN_REFILL_CYCLES_M ) );
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}
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//*****************************************************************************
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//
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// Get a random number from the generator
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//
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//*****************************************************************************
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uint32_t
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TRNGNumberGet(uint32_t ui32Word)
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{
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uint32_t ui32RandomNumber;
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// Check the arguments.
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ASSERT((ui32Word == TRNG_HI_WORD) ||
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(ui32Word == TRNG_LOW_WORD));
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// Return the right requested part of the generated number.
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if(ui32Word == TRNG_HI_WORD)
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{
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ui32RandomNumber = HWREG(TRNG_BASE + TRNG_O_OUT1);
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}
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else
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{
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ui32RandomNumber = HWREG(TRNG_BASE + TRNG_O_OUT0);
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}
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// Initiate generation of new number.
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HWREG(TRNG_BASE + TRNG_O_IRQFLAGCLR) = 0x1;
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// Return the random number.
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return ui32RandomNumber;
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}
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