108 lines
4.5 KiB
C
108 lines
4.5 KiB
C
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/**
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* @file xmc_prng.c
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* @date 2015-06-20
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*
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* @cond
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*********************************************************************************************************************
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* XMClib v2.1.8 - XMC Peripheral Driver Library
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*
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* Copyright (c) 2015-2016, Infineon Technologies AG
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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 modification,are permitted provided that the
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* following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided with the distribution.
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*
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* Neither the name of the copyright holders nor the names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY,OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* To improve the quality of the software, users are encouraged to share modifications, enhancements or bug fixes with
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* Infineon Technologies AG dave@infineon.com).
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*********************************************************************************************************************
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*
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* Change History
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* --------------
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*
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* 2015-02-20:
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* - Initial <br>
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* - Removed GetDriverVersion API <br>
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*
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* 2015-06-20
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* - Removed definition of GetDriverVersion API <br>
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*
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* @endcond
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*/
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#include "xmc_prng.h"
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#if defined (PRNG)
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/*********************************************************************************************************************
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* API IMPLEMENTATION
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*********************************************************************************************************************/
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/*
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* Initializes the PRNG peripheral with the settings in the
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* initialization structure XMC_PRNG_INIT_t
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*/
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XMC_PRNG_INIT_STATUS_t XMC_PRNG_Init(const XMC_PRNG_INIT_t *prng)
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{
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volatile uint16_t read_warm_up;
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uint16_t reg_val, iter;
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XMC_PRNG_INIT_STATUS_t status = XMC_PRNG_INITIALIZED;
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XMC_ASSERT("XMC_PRNG_Init:Null Pointer", (prng != (XMC_PRNG_INIT_t *)NULL));
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/* Configure block size for key loading mode */
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XMC_PRNG_SetRandomDataBlockSize(XMC_PRNG_RDBS_WORD);
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/* Enable key loading mode */
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XMC_PRNG_EnableKeyLoadingMode();
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/* Load key words (80 bits) and wait till RDV is set */
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for (iter = (uint16_t)0UL; iter < (uint16_t)5UL; iter++)
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{
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XMC_PRNG_LoadKeyWords(prng->key_words[iter]);
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while (PRNG_CHK_RDV_Msk != XMC_PRNG_CheckValidStatus());
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}
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XMC_PRNG_EnableStreamingMode();
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/* Warm up phase: Read and discard 64 bits */
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read_warm_up = PRNG->WORD;
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read_warm_up = PRNG->WORD;
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read_warm_up = PRNG->WORD;
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reg_val = PRNG->WORD;
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read_warm_up &= reg_val;
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/* Configure block size either byte (8 bit) or word (16 bit) */
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XMC_PRNG_SetRandomDataBlockSize(prng->block_size);
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/*
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* Checks for reset value for "random data block size". If reset,
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* PRNG is not initialized
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*/
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if ((uint16_t)XMC_PRNG_RDBS_RESET == (PRNG->CTRL & (uint16_t)PRNG_CTRL_RDBS_Msk))
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{
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status = XMC_PRNG_NOT_INITIALIZED;
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}
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return status;
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}
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#endif /* #if defined (PRNG) */
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