Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_Maxim/TARGET_MAX32630/mxc/crc.c@165:2dd56e6daeec, 2017-05-23 (annotated)

Committer:
ranaumarnaeem
Date:
Tue May 23 12:54:50 2017 +0000
Revision:
165:2dd56e6daeec
Parent:
157:ff67d9f36b67 
jhjg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 157:ff67d9f36b67 1 /**
<> 157:ff67d9f36b67 2 * @file
<> 157:ff67d9f36b67 3 * @brief This file contains the function implementations for the Cyclic
<> 157:ff67d9f36b67 4 * Redundency Check (CRC) peripheral module.
<> 157:ff67d9f36b67 5 */
<> 157:ff67d9f36b67 6
<> 157:ff67d9f36b67 7 /* ****************************************************************************
<> 157:ff67d9f36b67 8 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
<> 157:ff67d9f36b67 9 *
<> 157:ff67d9f36b67 10 * Permission is hereby granted, free of charge, to any person obtaining a
<> 157:ff67d9f36b67 11 * copy of this software and associated documentation files (the "Software"),
<> 157:ff67d9f36b67 12 * to deal in the Software without restriction, including without limitation
<> 157:ff67d9f36b67 13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
<> 157:ff67d9f36b67 14 * and/or sell copies of the Software, and to permit persons to whom the
<> 157:ff67d9f36b67 15 * Software is furnished to do so, subject to the following conditions:
<> 157:ff67d9f36b67 16 *
<> 157:ff67d9f36b67 17 * The above copyright notice and this permission notice shall be included
<> 157:ff67d9f36b67 18 * in all copies or substantial portions of the Software.
<> 157:ff67d9f36b67 19 *
<> 157:ff67d9f36b67 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
<> 157:ff67d9f36b67 21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
<> 157:ff67d9f36b67 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
<> 157:ff67d9f36b67 23 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
<> 157:ff67d9f36b67 24 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
<> 157:ff67d9f36b67 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
<> 157:ff67d9f36b67 26 * OTHER DEALINGS IN THE SOFTWARE.
<> 157:ff67d9f36b67 27 *
<> 157:ff67d9f36b67 28 * Except as contained in this notice, the name of Maxim Integrated
<> 157:ff67d9f36b67 29 * Products, Inc. shall not be used except as stated in the Maxim Integrated
<> 157:ff67d9f36b67 30 * Products, Inc. Branding Policy.
<> 157:ff67d9f36b67 31 *
<> 157:ff67d9f36b67 32 * The mere transfer of this software does not imply any licenses
<> 157:ff67d9f36b67 33 * of trade secrets, proprietary technology, copyrights, patents,
<> 157:ff67d9f36b67 34 * trademarks, maskwork rights, or any other form of intellectual
<> 157:ff67d9f36b67 35 * property whatsoever. Maxim Integrated Products, Inc. retains all
<> 157:ff67d9f36b67 36 * ownership rights.
<> 157:ff67d9f36b67 37 *
<> 157:ff67d9f36b67 38 * $Date: 2016-09-09 11:49:04 -0500 (Fri, 09 Sep 2016) $
<> 157:ff67d9f36b67 39 * $Revision: 24339 $
<> 157:ff67d9f36b67 40 *
<> 157:ff67d9f36b67 41 *************************************************************************** */
<> 157:ff67d9f36b67 42
<> 157:ff67d9f36b67 43 /* **** Includes **** */
<> 157:ff67d9f36b67 44 #include "crc.h"
<> 157:ff67d9f36b67 45
<> 157:ff67d9f36b67 46 /**
<> 157:ff67d9f36b67 47 * @ingroup crc
<> 157:ff67d9f36b67 48 * @{
<> 157:ff67d9f36b67 49 */
<> 157:ff67d9f36b67 50
<> 157:ff67d9f36b67 51 /* **** Definitions **** */
<> 157:ff67d9f36b67 52
<> 157:ff67d9f36b67 53 /* **** Globals **** */
<> 157:ff67d9f36b67 54
<> 157:ff67d9f36b67 55 /* **** Functions **** */
<> 157:ff67d9f36b67 56
<> 157:ff67d9f36b67 57 /* ************************************************************************* */
<> 157:ff67d9f36b67 58 void CRC16_Init(uint8_t CCITT_TRUE, uint8_t lilEndian)
<> 157:ff67d9f36b67 59 {
<> 157:ff67d9f36b67 60 if(CCITT_TRUE)
<> 157:ff67d9f36b67 61 MXC_CRC->reseed |= MXC_F_CRC_RESEED_CCITT_MODE;
<> 157:ff67d9f36b67 62 else
<> 157:ff67d9f36b67 63 MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_CCITT_MODE;
<> 157:ff67d9f36b67 64
<> 157:ff67d9f36b67 65 if(lilEndian)
<> 157:ff67d9f36b67 66 MXC_CRC->reseed |= MXC_F_CRC_RESEED_REV_ENDIAN16;
<> 157:ff67d9f36b67 67 else
<> 157:ff67d9f36b67 68 MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_REV_ENDIAN16;
<> 157:ff67d9f36b67 69 }
<> 157:ff67d9f36b67 70
<> 157:ff67d9f36b67 71 /* ************************************************************************* */
<> 157:ff67d9f36b67 72 void CRC32_Init(uint8_t lilEndian)
<> 157:ff67d9f36b67 73 {
<> 157:ff67d9f36b67 74 if(lilEndian)
<> 157:ff67d9f36b67 75 MXC_CRC->reseed |= MXC_F_CRC_RESEED_REV_ENDIAN32;
<> 157:ff67d9f36b67 76 else
<> 157:ff67d9f36b67 77 MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_REV_ENDIAN32;
<> 157:ff67d9f36b67 78 }
<> 157:ff67d9f36b67 79
<> 157:ff67d9f36b67 80 /* ************************************************************************* */
<> 157:ff67d9f36b67 81
<> 157:ff67d9f36b67 82 void CRC16_Reseed(uint16_t initData)
<> 157:ff67d9f36b67 83 {
<> 157:ff67d9f36b67 84 //set initial value
<> 157:ff67d9f36b67 85 MXC_CRC->seed16 = initData;
<> 157:ff67d9f36b67 86
<> 157:ff67d9f36b67 87 //reseed the CRC16 generator
<> 157:ff67d9f36b67 88 MXC_CRC->reseed |= MXC_F_CRC_RESEED_CRC16;
<> 157:ff67d9f36b67 89
<> 157:ff67d9f36b67 90 //wait for reseed to clear itself
<> 157:ff67d9f36b67 91 while(MXC_CRC->reseed & MXC_F_CRC_RESEED_CRC16);
<> 157:ff67d9f36b67 92
<> 157:ff67d9f36b67 93 }
<> 157:ff67d9f36b67 94
<> 157:ff67d9f36b67 95 /* ************************************************************************* */
<> 157:ff67d9f36b67 96 void CRC32_Reseed(uint32_t initData)
<> 157:ff67d9f36b67 97 {
<> 157:ff67d9f36b67 98 //set initial value
<> 157:ff67d9f36b67 99 MXC_CRC->seed32 = initData;
<> 157:ff67d9f36b67 100
<> 157:ff67d9f36b67 101 //reseed the CRC16 generator
<> 157:ff67d9f36b67 102 MXC_CRC->reseed |= MXC_F_CRC_RESEED_CRC32;
<> 157:ff67d9f36b67 103
<> 157:ff67d9f36b67 104 //wait for reseed to clear itself
<> 157:ff67d9f36b67 105 while(MXC_CRC->reseed & MXC_F_CRC_RESEED_CRC32);
<> 157:ff67d9f36b67 106 }
<> 157:ff67d9f36b67 107
<> 157:ff67d9f36b67 108 /**@} end of group crc */