mirror of https://github.com/ARMmbed/mbed-os.git
109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/**
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* @file crc.c
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* @brief This file contains the function implementations for the Cyclic
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* Redundency Check (CRC) peripheral module.
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*/
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/* ****************************************************************************
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* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*
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* $Date: 2016-08-02 13:45:09 -0500 (Tue, 02 Aug 2016) $
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* $Revision: 23897 $
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*
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*************************************************************************** */
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/* **** Includes **** */
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#include "crc.h"
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/**
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* @ingroup crc
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* @{
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*/
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/* **** Definitions **** */
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/* **** Globals **** */
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/* **** Functions **** */
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/* ************************************************************************* */
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void CRC16_Init(uint8_t CCITT_TRUE, uint8_t lilEndian)
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{
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if(CCITT_TRUE)
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MXC_CRC->reseed |= MXC_F_CRC_RESEED_CCITT_MODE;
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else
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MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_CCITT_MODE;
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if(lilEndian)
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MXC_CRC->reseed |= MXC_F_CRC_RESEED_REV_ENDIAN16;
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else
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MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_REV_ENDIAN16;
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}
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/* ************************************************************************* */
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void CRC32_Init(uint8_t lilEndian)
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{
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if(lilEndian)
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MXC_CRC->reseed |= MXC_F_CRC_RESEED_REV_ENDIAN32;
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else
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MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_REV_ENDIAN32;
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}
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/* ************************************************************************* */
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void CRC16_Reseed(uint16_t initData)
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{
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//set initial value
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MXC_CRC->seed16 = initData;
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//reseed the CRC16 generator
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MXC_CRC->reseed |= MXC_F_CRC_RESEED_CRC16;
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//wait for reseed to clear itself
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while(MXC_CRC->reseed & MXC_F_CRC_RESEED_CRC16);
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}
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/* ************************************************************************* */
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void CRC32_Reseed(uint32_t initData)
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{
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//set initial value
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MXC_CRC->seed32 = initData;
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//reseed the CRC16 generator
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MXC_CRC->reseed |= MXC_F_CRC_RESEED_CRC32;
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//wait for reseed to clear itself
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while(MXC_CRC->reseed & MXC_F_CRC_RESEED_CRC32);
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}
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/**@} end of group crc */
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