Maxim Integrated / LP_Receiver_Wakeup

This is a low power example of the MAX1473 RF Receiver using the MAX32630FTHR.

Dependencies:   MAX30208 mbed-dev max32630fthr USBDevice

ForwardErrCorr.cpp@4:7320d2a40b92, 2020-09-04 (annotated)

Committer:
tlyp
Date:
Fri Sep 04 20:45:01 2020 +0000
Revision:
4:7320d2a40b92
Parent:
2:e4fcc385e824 
Added Comments for clearer execution

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tlyp 2:e4fcc385e824 1 /*******************************************************************************
tlyp 2:e4fcc385e824 2 * Copyright (C) Maxim Integrated Products, Inc., All Rights Reserved.
tlyp 2:e4fcc385e824 3 *
tlyp 2:e4fcc385e824 4 * Permission is hereby granted, free of charge, to any person obtaining a
tlyp 2:e4fcc385e824 5 * copy of this software and associated documentation files (the "Software"),
tlyp 2:e4fcc385e824 6 * to deal in the Software without restriction, including without limitation
tlyp 2:e4fcc385e824 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
tlyp 2:e4fcc385e824 8 * and/or sell copies of the Software, and to permit persons to whom the
tlyp 2:e4fcc385e824 9 * Software is furnished to do so, subject to the following conditions:
tlyp 2:e4fcc385e824 10 *
tlyp 2:e4fcc385e824 11 * The above copyright notice and this permission notice shall be included
tlyp 2:e4fcc385e824 12 * in all copies or substantial portions of the Software.
tlyp 2:e4fcc385e824 13 *
tlyp 2:e4fcc385e824 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
tlyp 2:e4fcc385e824 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
tlyp 2:e4fcc385e824 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
tlyp 2:e4fcc385e824 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
tlyp 2:e4fcc385e824 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
tlyp 2:e4fcc385e824 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
tlyp 2:e4fcc385e824 20 * OTHER DEALINGS IN THE SOFTWARE.
tlyp 2:e4fcc385e824 21 *
tlyp 2:e4fcc385e824 22 * Except as contained in this notice, the name of Maxim Integrated
tlyp 2:e4fcc385e824 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
tlyp 2:e4fcc385e824 24 * Products, Inc. Branding Policy.
tlyp 2:e4fcc385e824 25 *
tlyp 2:e4fcc385e824 26 * The mere transfer of this software does not imply any licenses
tlyp 2:e4fcc385e824 27 * of trade secrets, proprietary technology, copyrights, patents,
tlyp 2:e4fcc385e824 28 * trademarks, maskwork rights, or any other form of intellectual
tlyp 2:e4fcc385e824 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
tlyp 2:e4fcc385e824 30 * ownership rights.
tlyp 2:e4fcc385e824 31 *******************************************************************************
tlyp 2:e4fcc385e824 32 */
tlyp 2:e4fcc385e824 33
tlyp 2:e4fcc385e824 34 #include "ForwardErrCorr.h"
tlyp 2:e4fcc385e824 35
tlyp 2:e4fcc385e824 36 Translator::Translator(char *SymmetricKey, char *TransTable):
tlyp 2:e4fcc385e824 37 m_SymmetricKey(SymmetricKey),m_TransTable(TransTable)
tlyp 2:e4fcc385e824 38 {
tlyp 2:e4fcc385e824 39 }
tlyp 2:e4fcc385e824 40
tlyp 2:e4fcc385e824 41 //******************************************************************************
tlyp 2:e4fcc385e824 42 Translator::~Translator(void){
tlyp 2:e4fcc385e824 43 }
tlyp 2:e4fcc385e824 44
tlyp 2:e4fcc385e824 45 //******************************************************************************
tlyp 2:e4fcc385e824 46 uint32_t Translator::Decrypt(char *tes, uint16_t *Output){
tlyp 2:e4fcc385e824 47 int8_t ValOut,ValIn;
tlyp 2:e4fcc385e824 48 int key = 0;
tlyp 2:e4fcc385e824 49 Output[0] = 0;
tlyp 2:e4fcc385e824 50 printf("Recieved Data -> Decrypted Data:\r\n");
tlyp 2:e4fcc385e824 51 for(int i = 2;i<10;i++){
tlyp 2:e4fcc385e824 52 ValIn = tes[i];
tlyp 2:e4fcc385e824 53 ValIn = ValIn ^ m_SymmetricKey[key]; //Unencrypt data
tlyp 2:e4fcc385e824 54 printf("%c -> %i\r\n",tes[i],ValIn);
tlyp 2:e4fcc385e824 55 key++;
tlyp 2:e4fcc385e824 56 ValOut = 5;
tlyp 2:e4fcc385e824 57 for (int j=0;j<4;j++){
tlyp 2:e4fcc385e824 58 if (ValIn == m_TransTable[j]){
tlyp 2:e4fcc385e824 59 ValOut = j;
tlyp 2:e4fcc385e824 60 }
tlyp 2:e4fcc385e824 61 }
tlyp 2:e4fcc385e824 62 if (ValOut == 5){
tlyp 2:e4fcc385e824 63 ValOut = ChkHam(ValIn);
tlyp 2:e4fcc385e824 64 }
tlyp 2:e4fcc385e824 65 if (ValOut == 4){
tlyp 2:e4fcc385e824 66 printf("Transmission error -- Hamming Distance Collision\r\n");
tlyp 2:e4fcc385e824 67 return (1);
tlyp 2:e4fcc385e824 68 }
tlyp 2:e4fcc385e824 69 Output[0] = (Output[0] << 2) + ValOut;
tlyp 2:e4fcc385e824 70 }
tlyp 2:e4fcc385e824 71 return(0);
tlyp 2:e4fcc385e824 72 }
tlyp 2:e4fcc385e824 73
tlyp 2:e4fcc385e824 74 //******************************************************************************
tlyp 2:e4fcc385e824 75 int Translator::ChkHam(char ChkVal){
tlyp 2:e4fcc385e824 76 char trial = ChkVal & 0x1F;
tlyp 2:e4fcc385e824 77 bool dupe = 0;
tlyp 2:e4fcc385e824 78 int index, temp;
tlyp 2:e4fcc385e824 79 int min = 5;
tlyp 2:e4fcc385e824 80 for (int k = 0; k<4;k++){
tlyp 2:e4fcc385e824 81 temp = HamDist(trial,m_TransTable[k]);
tlyp 2:e4fcc385e824 82 if (temp == 1){
tlyp 2:e4fcc385e824 83 return (k);
tlyp 2:e4fcc385e824 84 }
tlyp 2:e4fcc385e824 85 else if (temp < min){
tlyp 2:e4fcc385e824 86 min = temp;
tlyp 2:e4fcc385e824 87 index = k;
tlyp 2:e4fcc385e824 88 dupe = 0;
tlyp 2:e4fcc385e824 89 }
tlyp 2:e4fcc385e824 90 else if (temp == min){
tlyp 2:e4fcc385e824 91 dupe = 1;
tlyp 2:e4fcc385e824 92 }
tlyp 2:e4fcc385e824 93 }
tlyp 2:e4fcc385e824 94 if (dupe == 1){
tlyp 2:e4fcc385e824 95 return(4);
tlyp 2:e4fcc385e824 96 }
tlyp 2:e4fcc385e824 97 else{
tlyp 2:e4fcc385e824 98 return (index);
tlyp 2:e4fcc385e824 99 }
tlyp 2:e4fcc385e824 100 }
tlyp 2:e4fcc385e824 101
tlyp 2:e4fcc385e824 102 //******************************************************************************
tlyp 2:e4fcc385e824 103 int Translator::HamDist(char ChkVal, char TableVal){
tlyp 2:e4fcc385e824 104 int count=0;
tlyp 2:e4fcc385e824 105 char tes1,tes2;
tlyp 2:e4fcc385e824 106 for (int j =0;j<5;j++){
tlyp 2:e4fcc385e824 107 tes1 = ChkVal >> j;
tlyp 2:e4fcc385e824 108 tes2 = TableVal >> j;
tlyp 2:e4fcc385e824 109 char temp = tes1 ^ tes2;
tlyp 2:e4fcc385e824 110 count += temp&1;
tlyp 2:e4fcc385e824 111 }
tlyp 2:e4fcc385e824 112 return (count);
tlyp 2:e4fcc385e824 113 }
tlyp 2:e4fcc385e824 114
tlyp 2:e4fcc385e824 115 //******************************************************************************
tlyp 2:e4fcc385e824 116 uint32_t Translator::Encrypt(uint16_t tempData,char *EncryptedData){
tlyp 2:e4fcc385e824 117 char data;
tlyp 2:e4fcc385e824 118 int z=0;
tlyp 2:e4fcc385e824 119 printf("FEC Encoded Data:\r\n");
tlyp 2:e4fcc385e824 120 for (int i=14;i>=0;i-=2){
tlyp 2:e4fcc385e824 121 data = ((tempData >> i)&0x03);
tlyp 2:e4fcc385e824 122 data = m_TransTable[data];
tlyp 2:e4fcc385e824 123 printf("%d ",data);
tlyp 2:e4fcc385e824 124 data = (data ^ m_SymmetricKey[z]);
tlyp 2:e4fcc385e824 125 EncryptedData[z]=data;
tlyp 2:e4fcc385e824 126 z++;
tlyp 2:e4fcc385e824 127 }
tlyp 2:e4fcc385e824 128 printf("\r\n");
tlyp 2:e4fcc385e824 129 return(0);
tlyp 2:e4fcc385e824 130 }
tlyp 2:e4fcc385e824 131
tlyp 2:e4fcc385e824 132 //******************************************************************************
tlyp 2:e4fcc385e824 133 uint32_t Translator::Encrypt(char tempData, char *EncryptedData){
tlyp 2:e4fcc385e824 134 char data;
tlyp 2:e4fcc385e824 135 int z =0;
tlyp 2:e4fcc385e824 136 for (int i=6;i>=0;i-=2){
tlyp 2:e4fcc385e824 137 data = ((tempData >> i)&0x03);
tlyp 2:e4fcc385e824 138 data = m_TransTable[data];
tlyp 2:e4fcc385e824 139 data = (data ^ m_SymmetricKey[z]);
tlyp 2:e4fcc385e824 140 EncryptedData[z] = data;
tlyp 2:e4fcc385e824 141 z++;
tlyp 2:e4fcc385e824 142 }
tlyp 2:e4fcc385e824 143 return(0);
tlyp 2:e4fcc385e824 144 }