mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_Maxim/TARGET_MAX32620C/mxc/crc.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
186:707f6e361f3e 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 /**
Anna Bridge 186:707f6e361f3e 2 * @file
Anna Bridge 186:707f6e361f3e 3 * @brief This file contains the function implementations for the Cyclic
Anna Bridge 186:707f6e361f3e 4 * Redundency Check (CRC) peripheral module.
Anna Bridge 186:707f6e361f3e 5 */
Anna Bridge 186:707f6e361f3e 6
Anna Bridge 186:707f6e361f3e 7 /* ****************************************************************************
Anna Bridge 186:707f6e361f3e 8 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
Anna Bridge 186:707f6e361f3e 9 *
Anna Bridge 186:707f6e361f3e 10 * Permission is hereby granted, free of charge, to any person obtaining a
Anna Bridge 186:707f6e361f3e 11 * copy of this software and associated documentation files (the "Software"),
Anna Bridge 186:707f6e361f3e 12 * to deal in the Software without restriction, including without limitation
Anna Bridge 186:707f6e361f3e 13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
Anna Bridge 186:707f6e361f3e 14 * and/or sell copies of the Software, and to permit persons to whom the
Anna Bridge 186:707f6e361f3e 15 * Software is furnished to do so, subject to the following conditions:
Anna Bridge 186:707f6e361f3e 16 *
Anna Bridge 186:707f6e361f3e 17 * The above copyright notice and this permission notice shall be included
Anna Bridge 186:707f6e361f3e 18 * in all copies or substantial portions of the Software.
Anna Bridge 186:707f6e361f3e 19 *
Anna Bridge 186:707f6e361f3e 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
Anna Bridge 186:707f6e361f3e 21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Anna Bridge 186:707f6e361f3e 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Anna Bridge 186:707f6e361f3e 23 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
Anna Bridge 186:707f6e361f3e 24 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
Anna Bridge 186:707f6e361f3e 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
Anna Bridge 186:707f6e361f3e 26 * OTHER DEALINGS IN THE SOFTWARE.
Anna Bridge 186:707f6e361f3e 27 *
Anna Bridge 186:707f6e361f3e 28 * Except as contained in this notice, the name of Maxim Integrated
Anna Bridge 186:707f6e361f3e 29 * Products, Inc. shall not be used except as stated in the Maxim Integrated
Anna Bridge 186:707f6e361f3e 30 * Products, Inc. Branding Policy.
Anna Bridge 186:707f6e361f3e 31 *
Anna Bridge 186:707f6e361f3e 32 * The mere transfer of this software does not imply any licenses
Anna Bridge 186:707f6e361f3e 33 * of trade secrets, proprietary technology, copyrights, patents,
Anna Bridge 186:707f6e361f3e 34 * trademarks, maskwork rights, or any other form of intellectual
Anna Bridge 186:707f6e361f3e 35 * property whatsoever. Maxim Integrated Products, Inc. retains all
Anna Bridge 186:707f6e361f3e 36 * ownership rights.
Anna Bridge 186:707f6e361f3e 37 *
Anna Bridge 186:707f6e361f3e 38 * $Date: 2016-09-09 11:49:04 -0500 (Fri, 09 Sep 2016) $
Anna Bridge 186:707f6e361f3e 39 * $Revision: 24339 $
Anna Bridge 186:707f6e361f3e 40 *
Anna Bridge 186:707f6e361f3e 41 *************************************************************************** */
Anna Bridge 186:707f6e361f3e 42
Anna Bridge 186:707f6e361f3e 43 /* **** Includes **** */
Anna Bridge 186:707f6e361f3e 44 #include "crc.h"
Anna Bridge 186:707f6e361f3e 45
Anna Bridge 186:707f6e361f3e 46 /**
Anna Bridge 186:707f6e361f3e 47 * @ingroup crc
Anna Bridge 186:707f6e361f3e 48 * @{
Anna Bridge 186:707f6e361f3e 49 */
Anna Bridge 186:707f6e361f3e 50
Anna Bridge 186:707f6e361f3e 51 /* **** Definitions **** */
Anna Bridge 186:707f6e361f3e 52
Anna Bridge 186:707f6e361f3e 53 /* **** Globals **** */
Anna Bridge 186:707f6e361f3e 54
Anna Bridge 186:707f6e361f3e 55 /* **** Functions **** */
Anna Bridge 186:707f6e361f3e 56
Anna Bridge 186:707f6e361f3e 57 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 58 void CRC16_Init(uint8_t CCITT_TRUE, uint8_t lilEndian)
Anna Bridge 186:707f6e361f3e 59 {
Anna Bridge 186:707f6e361f3e 60 if(CCITT_TRUE)
Anna Bridge 186:707f6e361f3e 61 MXC_CRC->reseed |= MXC_F_CRC_RESEED_CCITT_MODE;
Anna Bridge 186:707f6e361f3e 62 else
Anna Bridge 186:707f6e361f3e 63 MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_CCITT_MODE;
Anna Bridge 186:707f6e361f3e 64
Anna Bridge 186:707f6e361f3e 65 if(lilEndian)
Anna Bridge 186:707f6e361f3e 66 MXC_CRC->reseed |= MXC_F_CRC_RESEED_REV_ENDIAN16;
Anna Bridge 186:707f6e361f3e 67 else
Anna Bridge 186:707f6e361f3e 68 MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_REV_ENDIAN16;
Anna Bridge 186:707f6e361f3e 69 }
Anna Bridge 186:707f6e361f3e 70
Anna Bridge 186:707f6e361f3e 71 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 72 void CRC32_Init(uint8_t lilEndian)
Anna Bridge 186:707f6e361f3e 73 {
Anna Bridge 186:707f6e361f3e 74 if(lilEndian)
Anna Bridge 186:707f6e361f3e 75 MXC_CRC->reseed |= MXC_F_CRC_RESEED_REV_ENDIAN32;
Anna Bridge 186:707f6e361f3e 76 else
Anna Bridge 186:707f6e361f3e 77 MXC_CRC->reseed &= ~MXC_F_CRC_RESEED_REV_ENDIAN32;
Anna Bridge 186:707f6e361f3e 78 }
Anna Bridge 186:707f6e361f3e 79
Anna Bridge 186:707f6e361f3e 80 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 81
Anna Bridge 186:707f6e361f3e 82 void CRC16_Reseed(uint16_t initData)
Anna Bridge 186:707f6e361f3e 83 {
Anna Bridge 186:707f6e361f3e 84 //set initial value
Anna Bridge 186:707f6e361f3e 85 MXC_CRC->seed16 = initData;
Anna Bridge 186:707f6e361f3e 86
Anna Bridge 186:707f6e361f3e 87 //reseed the CRC16 generator
Anna Bridge 186:707f6e361f3e 88 MXC_CRC->reseed |= MXC_F_CRC_RESEED_CRC16;
Anna Bridge 186:707f6e361f3e 89
Anna Bridge 186:707f6e361f3e 90 //wait for reseed to clear itself
Anna Bridge 186:707f6e361f3e 91 while(MXC_CRC->reseed & MXC_F_CRC_RESEED_CRC16);
Anna Bridge 186:707f6e361f3e 92
Anna Bridge 186:707f6e361f3e 93 }
Anna Bridge 186:707f6e361f3e 94
Anna Bridge 186:707f6e361f3e 95 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 96 void CRC32_Reseed(uint32_t initData)
Anna Bridge 186:707f6e361f3e 97 {
Anna Bridge 186:707f6e361f3e 98 //set initial value
Anna Bridge 186:707f6e361f3e 99 MXC_CRC->seed32 = initData;
Anna Bridge 186:707f6e361f3e 100
Anna Bridge 186:707f6e361f3e 101 //reseed the CRC16 generator
Anna Bridge 186:707f6e361f3e 102 MXC_CRC->reseed |= MXC_F_CRC_RESEED_CRC32;
Anna Bridge 186:707f6e361f3e 103
Anna Bridge 186:707f6e361f3e 104 //wait for reseed to clear itself
Anna Bridge 186:707f6e361f3e 105 while(MXC_CRC->reseed & MXC_F_CRC_RESEED_CRC32);
Anna Bridge 186:707f6e361f3e 106 }
Anna Bridge 186:707f6e361f3e 107
Anna Bridge 186:707f6e361f3e 108 /**@} end of group crc */