Maxim Integrated / LP_Transmitter_Wakeup

Example for using the MAX1472 RF Transmitter for low power data transmission.

Dependencies:   mbed-dev2 max32630fthr USBDevice

ForwardErrCorr.cpp@4:2e3db197b7e2, 2020-09-04 (annotated)

Committer:
tlyp
Date:
Fri Sep 04 20:41:34 2020 +0000
Revision:
4:2e3db197b7e2
Parent:
2:33b3b46a9c0d 
Cleaned up header

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tlyp 2:33b3b46a9c0d 1 /*******************************************************************************
tlyp 2:33b3b46a9c0d 2 * Copyright (C) Maxim Integrated Products, Inc., All Rights Reserved.
tlyp 2:33b3b46a9c0d 3 *
tlyp 2:33b3b46a9c0d 4 * Permission is hereby granted, free of charge, to any person obtaining a
tlyp 2:33b3b46a9c0d 5 * copy of this software and associated documentation files (the "Software"),
tlyp 2:33b3b46a9c0d 6 * to deal in the Software without restriction, including without limitation
tlyp 2:33b3b46a9c0d 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
tlyp 2:33b3b46a9c0d 8 * and/or sell copies of the Software, and to permit persons to whom the
tlyp 2:33b3b46a9c0d 9 * Software is furnished to do so, subject to the following conditions:
tlyp 2:33b3b46a9c0d 10 *
tlyp 2:33b3b46a9c0d 11 * The above copyright notice and this permission notice shall be included
tlyp 2:33b3b46a9c0d 12 * in all copies or substantial portions of the Software.
tlyp 2:33b3b46a9c0d 13 *
tlyp 2:33b3b46a9c0d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
tlyp 2:33b3b46a9c0d 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
tlyp 2:33b3b46a9c0d 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
tlyp 2:33b3b46a9c0d 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
tlyp 2:33b3b46a9c0d 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
tlyp 2:33b3b46a9c0d 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
tlyp 2:33b3b46a9c0d 20 * OTHER DEALINGS IN THE SOFTWARE.
tlyp 2:33b3b46a9c0d 21 *
tlyp 2:33b3b46a9c0d 22 * Except as contained in this notice, the name of Maxim Integrated
tlyp 2:33b3b46a9c0d 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
tlyp 2:33b3b46a9c0d 24 * Products, Inc. Branding Policy.
tlyp 2:33b3b46a9c0d 25 *
tlyp 2:33b3b46a9c0d 26 * The mere transfer of this software does not imply any licenses
tlyp 2:33b3b46a9c0d 27 * of trade secrets, proprietary technology, copyrights, patents,
tlyp 2:33b3b46a9c0d 28 * trademarks, maskwork rights, or any other form of intellectual
tlyp 2:33b3b46a9c0d 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
tlyp 2:33b3b46a9c0d 30 * ownership rights.
tlyp 2:33b3b46a9c0d 31 *******************************************************************************
tlyp 2:33b3b46a9c0d 32 */
tlyp 2:33b3b46a9c0d 33
tlyp 2:33b3b46a9c0d 34 #include "ForwardErrCorr.h"
tlyp 2:33b3b46a9c0d 35
tlyp 2:33b3b46a9c0d 36 Translator::Translator(char *SymmetricKey, char *TransTable):
tlyp 2:33b3b46a9c0d 37 m_SymmetricKey(SymmetricKey),m_TransTable(TransTable)
tlyp 2:33b3b46a9c0d 38 {
tlyp 2:33b3b46a9c0d 39 }
tlyp 2:33b3b46a9c0d 40
tlyp 2:33b3b46a9c0d 41 //******************************************************************************
tlyp 2:33b3b46a9c0d 42 Translator::~Translator(void){
tlyp 2:33b3b46a9c0d 43 }
tlyp 2:33b3b46a9c0d 44
tlyp 2:33b3b46a9c0d 45 //******************************************************************************
tlyp 2:33b3b46a9c0d 46 uint32_t Translator::Decrypt(char *tes, uint16_t *Output){
tlyp 2:33b3b46a9c0d 47 int8_t ValOut,ValIn;
tlyp 2:33b3b46a9c0d 48 int key = 0;
tlyp 2:33b3b46a9c0d 49 Output[0] = 0;
tlyp 2:33b3b46a9c0d 50 printf("Recieved Data -> Decrypted Data:\r\n");
tlyp 2:33b3b46a9c0d 51 for(int i = 2;i<10;i++){
tlyp 2:33b3b46a9c0d 52 ValIn = tes[i];
tlyp 2:33b3b46a9c0d 53 ValIn = ValIn ^ m_SymmetricKey[key]; //Unencrypt data
tlyp 2:33b3b46a9c0d 54 printf("%c -> %i\r\n",ValIn,tes[i]);
tlyp 2:33b3b46a9c0d 55 key++;
tlyp 2:33b3b46a9c0d 56 ValOut = 5;
tlyp 2:33b3b46a9c0d 57 for (int j=0;j<4;j++){
tlyp 2:33b3b46a9c0d 58 if (ValIn == m_TransTable[j]){
tlyp 2:33b3b46a9c0d 59 ValOut = j;
tlyp 2:33b3b46a9c0d 60 }
tlyp 2:33b3b46a9c0d 61 }
tlyp 2:33b3b46a9c0d 62 if (ValOut == 5){
tlyp 2:33b3b46a9c0d 63 ValOut = ChkHam(ValIn);
tlyp 2:33b3b46a9c0d 64 }
tlyp 2:33b3b46a9c0d 65 if (ValOut == 4){
tlyp 2:33b3b46a9c0d 66 printf("Transmission error -- Hamming Distance Collision\r\n");
tlyp 2:33b3b46a9c0d 67 return (1);
tlyp 2:33b3b46a9c0d 68 }
tlyp 2:33b3b46a9c0d 69 Output[0] = (Output[0] << 2) + ValOut;
tlyp 2:33b3b46a9c0d 70 printf("Output: %d\r\n",Output[0]);
tlyp 2:33b3b46a9c0d 71 }
tlyp 2:33b3b46a9c0d 72 return(0);
tlyp 2:33b3b46a9c0d 73 }
tlyp 2:33b3b46a9c0d 74
tlyp 2:33b3b46a9c0d 75 //******************************************************************************
tlyp 2:33b3b46a9c0d 76 int Translator::ChkHam(char ChkVal){
tlyp 2:33b3b46a9c0d 77 char trial = ChkVal & 0x1F;
tlyp 2:33b3b46a9c0d 78 bool dupe = 0;
tlyp 2:33b3b46a9c0d 79 int index, temp;
tlyp 2:33b3b46a9c0d 80 int min = 5;
tlyp 2:33b3b46a9c0d 81 for (int k = 0; k<4;k++){
tlyp 2:33b3b46a9c0d 82 temp = HamDist(trial,m_TransTable[k]);
tlyp 2:33b3b46a9c0d 83 if (temp == 1){
tlyp 2:33b3b46a9c0d 84 return (k);
tlyp 2:33b3b46a9c0d 85 }
tlyp 2:33b3b46a9c0d 86 else if (temp < min){
tlyp 2:33b3b46a9c0d 87 min = temp;
tlyp 2:33b3b46a9c0d 88 index = k;
tlyp 2:33b3b46a9c0d 89 dupe = 0;
tlyp 2:33b3b46a9c0d 90 }
tlyp 2:33b3b46a9c0d 91 else if (temp == min){
tlyp 2:33b3b46a9c0d 92 dupe = 1;
tlyp 2:33b3b46a9c0d 93 }
tlyp 2:33b3b46a9c0d 94 }
tlyp 2:33b3b46a9c0d 95 if (dupe == 1){
tlyp 2:33b3b46a9c0d 96 return(4);
tlyp 2:33b3b46a9c0d 97 }
tlyp 2:33b3b46a9c0d 98 else{
tlyp 2:33b3b46a9c0d 99 return (index);
tlyp 2:33b3b46a9c0d 100 }
tlyp 2:33b3b46a9c0d 101 }
tlyp 2:33b3b46a9c0d 102
tlyp 2:33b3b46a9c0d 103 //******************************************************************************
tlyp 2:33b3b46a9c0d 104 int Translator::HamDist(char ChkVal, char TableVal){
tlyp 2:33b3b46a9c0d 105 int count=0;
tlyp 2:33b3b46a9c0d 106 char tes1,tes2;
tlyp 2:33b3b46a9c0d 107 for (int j =0;j<5;j++){
tlyp 2:33b3b46a9c0d 108 tes1 = ChkVal >> j;
tlyp 2:33b3b46a9c0d 109 tes2 = TableVal >> j;
tlyp 2:33b3b46a9c0d 110 char temp = tes1 ^ tes2;
tlyp 2:33b3b46a9c0d 111 count += temp&1;
tlyp 2:33b3b46a9c0d 112 }
tlyp 2:33b3b46a9c0d 113 return (count);
tlyp 2:33b3b46a9c0d 114 }
tlyp 2:33b3b46a9c0d 115
tlyp 2:33b3b46a9c0d 116 //******************************************************************************
tlyp 2:33b3b46a9c0d 117 uint32_t Translator::Encrypt(uint16_t tempData,char *EncryptedData){
tlyp 2:33b3b46a9c0d 118 char data;
tlyp 2:33b3b46a9c0d 119 int z=0;
tlyp 2:33b3b46a9c0d 120 printf("FEC Encoded Data:\r\n");
tlyp 2:33b3b46a9c0d 121 for (int i=14;i>=0;i-=2){
tlyp 2:33b3b46a9c0d 122 data = ((tempData >> i)&0x03);
tlyp 2:33b3b46a9c0d 123 data = m_TransTable[data];
tlyp 2:33b3b46a9c0d 124 printf("%d ",data);
tlyp 2:33b3b46a9c0d 125 data = (data ^ m_SymmetricKey[z]);
tlyp 2:33b3b46a9c0d 126 EncryptedData[z]=data;
tlyp 2:33b3b46a9c0d 127 z++;
tlyp 2:33b3b46a9c0d 128 }
tlyp 2:33b3b46a9c0d 129 printf("\r\n");
tlyp 2:33b3b46a9c0d 130 return(0);
tlyp 2:33b3b46a9c0d 131 }
tlyp 2:33b3b46a9c0d 132
tlyp 2:33b3b46a9c0d 133 //******************************************************************************
tlyp 2:33b3b46a9c0d 134 uint32_t Translator::Encrypt(char tempData, char *EncryptedData){
tlyp 2:33b3b46a9c0d 135 char data;
tlyp 2:33b3b46a9c0d 136 int z =0;
tlyp 2:33b3b46a9c0d 137 for (int i=6;i>=0;i-=2){
tlyp 2:33b3b46a9c0d 138 data = ((tempData >> i)&0x03);
tlyp 2:33b3b46a9c0d 139 data = m_TransTable[data];
tlyp 2:33b3b46a9c0d 140 data = (data ^ m_SymmetricKey[z]);
tlyp 2:33b3b46a9c0d 141 EncryptedData[z] = data;
tlyp 2:33b3b46a9c0d 142 z++;
tlyp 2:33b3b46a9c0d 143 }
tlyp 2:33b3b46a9c0d 144 return(0);
tlyp 2:33b3b46a9c0d 145 }