Vincent Belanger / Mbed 2 deprecated APP4

APP 4

Dependencies:   mbed CRC16 mbed-rtos

MEF.cpp@20:f0932bfe09ed, 2016-02-23 (annotated)

Committer:
vinbel93
Date:
Tue Feb 23 00:22:49 2016 +0000
Revision:
20:f0932bfe09ed
Parent:
16:cf433716f8d6
Child:
21:137d010e7469
Child:
22:b855dbf3a8c1
Child:
23:d41a23d8f2d7
final v1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
manl2003 10:51ee22e230c7 1 #include "MEF.h"
manl2003 12:715af3660c73 2 #include "CRC16.h"
manl2003 10:51ee22e230c7 3
vinbel93 20:f0932bfe09ed 4 void MEF::init()
vinbel93 20:f0932bfe09ed 5 {
vinbel93 20:f0932bfe09ed 6 m_InputBuffer.reset();
vinbel93 20:f0932bfe09ed 7 m_BSPayload.reset();
vinbel93 20:f0932bfe09ed 8 memset(m_CPayload, 0, 80);
vinbel93 20:f0932bfe09ed 9 m_Counter = 0;
vinbel93 20:f0932bfe09ed 10 m_DataSize = 0;
vinbel93 20:f0932bfe09ed 11 m_CRC = 0;
vinbel93 20:f0932bfe09ed 12 }
vinbel93 20:f0932bfe09ed 13
manl2003 10:51ee22e230c7 14 void MEF::ReceiveBit(bool bit)
manl2003 10:51ee22e230c7 15 {
manl2003 10:51ee22e230c7 16 switch (state)
manl2003 10:51ee22e230c7 17 {
manl2003 10:51ee22e230c7 18 case PREAMBLE :
manl2003 10:51ee22e230c7 19 {
manl2003 10:51ee22e230c7 20 m_InputBuffer[m_Counter] = bit;
manl2003 10:51ee22e230c7 21 m_Counter++;
manl2003 12:715af3660c73 22 if(m_Counter == 8 )
manl2003 10:51ee22e230c7 23 {
vinbel93 20:f0932bfe09ed 24 if(preambleChecker())
vinbel93 20:f0932bfe09ed 25 {
vinbel93 20:f0932bfe09ed 26 state = START;
vinbel93 20:f0932bfe09ed 27 }
vinbel93 20:f0932bfe09ed 28 m_Counter = 0;
manl2003 10:51ee22e230c7 29 }
manl2003 10:51ee22e230c7 30
manl2003 10:51ee22e230c7 31 }break;
manl2003 10:51ee22e230c7 32 case START :
manl2003 10:51ee22e230c7 33 {
manl2003 10:51ee22e230c7 34 m_InputBuffer[m_Counter] = bit;
manl2003 10:51ee22e230c7 35 m_Counter++;
vinbel93 20:f0932bfe09ed 36 if(m_Counter == 8)
manl2003 10:51ee22e230c7 37 {
vinbel93 20:f0932bfe09ed 38 if(startChecker())
vinbel93 20:f0932bfe09ed 39 {
vinbel93 20:f0932bfe09ed 40 state = TYPE;
vinbel93 20:f0932bfe09ed 41 m_Counter = 0;
vinbel93 20:f0932bfe09ed 42 }
vinbel93 20:f0932bfe09ed 43 else
vinbel93 20:f0932bfe09ed 44 {
vinbel93 20:f0932bfe09ed 45 //Bluboom
vinbel93 20:f0932bfe09ed 46 _decodeError();
vinbel93 20:f0932bfe09ed 47 state = PREAMBLE;
vinbel93 20:f0932bfe09ed 48 init();
vinbel93 20:f0932bfe09ed 49 }
vinbel93 20:f0932bfe09ed 50 }
manl2003 10:51ee22e230c7 51 }break;
manl2003 10:51ee22e230c7 52 case TYPE :
manl2003 10:51ee22e230c7 53 {
manl2003 10:51ee22e230c7 54 m_Counter ++;
manl2003 10:51ee22e230c7 55 if(m_Counter == 8)
manl2003 10:51ee22e230c7 56 {
manl2003 10:51ee22e230c7 57 state = LENGTH;
manl2003 10:51ee22e230c7 58 m_Counter = 0;
manl2003 10:51ee22e230c7 59 }
manl2003 10:51ee22e230c7 60
manl2003 10:51ee22e230c7 61 }break;
manl2003 10:51ee22e230c7 62 case LENGTH :
manl2003 10:51ee22e230c7 63 {
manl2003 10:51ee22e230c7 64 m_InputBuffer[m_Counter] = bit;
manl2003 10:51ee22e230c7 65 m_Counter++;
manl2003 10:51ee22e230c7 66 if(m_Counter == 8)
manl2003 10:51ee22e230c7 67 {
manl2003 10:51ee22e230c7 68 state = DATA;
manl2003 10:51ee22e230c7 69 m_DataSize = calculateSize();
manl2003 10:51ee22e230c7 70 m_Counter = 0;
manl2003 10:51ee22e230c7 71 }
manl2003 10:51ee22e230c7 72
manl2003 10:51ee22e230c7 73 }break;
manl2003 10:51ee22e230c7 74 case DATA :
manl2003 10:51ee22e230c7 75 {
manl2003 12:715af3660c73 76 m_BSPayload[m_Counter] = bit;
vinbel93 20:f0932bfe09ed 77 if (((m_Counter + 1) % 8) == 0 && m_Counter != 0)
manl2003 12:715af3660c73 78 {
vinbel93 20:f0932bfe09ed 79 m_CPayload[(m_Counter + 1)/ 8 - 1] = (m_BSPayload[m_Counter] << 0) | (m_BSPayload[m_Counter - 1] << 1) | (m_BSPayload[m_Counter - 2] << 2) | (m_BSPayload[m_Counter - 3] << 3) | (m_BSPayload[m_Counter - 4] << 4) | (m_BSPayload[m_Counter - 5] << 5) | (m_BSPayload[m_Counter - 6] << 6) | (m_BSPayload[m_Counter - 7] << 7);
manl2003 12:715af3660c73 80 }
manl2003 12:715af3660c73 81 m_Counter++;
manl2003 12:715af3660c73 82 if(m_Counter == m_DataSize*8)
manl2003 12:715af3660c73 83 {
manl2003 12:715af3660c73 84 state = CRC16STATE;
vinbel93 20:f0932bfe09ed 85 m_CRC = CRC16::calculateCRC16(m_CPayload, m_DataSize);
vinbel93 20:f0932bfe09ed 86 m_Counter = 0;
manl2003 12:715af3660c73 87 }
manl2003 10:51ee22e230c7 88 }break;
manl2003 12:715af3660c73 89 case CRC16STATE :
manl2003 10:51ee22e230c7 90 {
manl2003 12:715af3660c73 91 m_InputBuffer[m_Counter] = bit;
manl2003 12:715af3660c73 92 m_Counter++;
manl2003 12:715af3660c73 93 if(m_Counter == 16)
manl2003 12:715af3660c73 94 {
manl2003 12:715af3660c73 95 if(!compareCRC())
manl2003 12:715af3660c73 96 {
manl2003 12:715af3660c73 97 //BOOMBOOM
vinbel93 20:f0932bfe09ed 98 _decodeError();
vinbel93 20:f0932bfe09ed 99 state = PREAMBLE;
vinbel93 20:f0932bfe09ed 100 init();
manl2003 12:715af3660c73 101 }
manl2003 16:cf433716f8d6 102 else
manl2003 16:cf433716f8d6 103 {
vinbel93 20:f0932bfe09ed 104 state = END;
manl2003 16:cf433716f8d6 105 }
manl2003 12:715af3660c73 106 m_Counter = 0;
manl2003 12:715af3660c73 107 }
manl2003 10:51ee22e230c7 108
manl2003 10:51ee22e230c7 109 }break;
manl2003 10:51ee22e230c7 110 case END :
manl2003 10:51ee22e230c7 111 {
manl2003 12:715af3660c73 112 m_InputBuffer[m_Counter] = bit;
manl2003 12:715af3660c73 113 m_Counter++;
vinbel93 20:f0932bfe09ed 114 if(m_Counter == 8)
manl2003 12:715af3660c73 115 {
vinbel93 20:f0932bfe09ed 116 if(startChecker())
vinbel93 20:f0932bfe09ed 117 {
vinbel93 20:f0932bfe09ed 118 state = PREAMBLE;
vinbel93 20:f0932bfe09ed 119 m_Counter = 0;
vinbel93 20:f0932bfe09ed 120 //CALLBACK
vinbel93 20:f0932bfe09ed 121 _decodeCallback(m_BSPayload, m_DataSize);
vinbel93 20:f0932bfe09ed 122 }
vinbel93 20:f0932bfe09ed 123 else
vinbel93 20:f0932bfe09ed 124 {
vinbel93 20:f0932bfe09ed 125 //BOOMBOOM
vinbel93 20:f0932bfe09ed 126 _decodeError();
vinbel93 20:f0932bfe09ed 127 state = PREAMBLE;
vinbel93 20:f0932bfe09ed 128 init();
vinbel93 20:f0932bfe09ed 129 }
manl2003 12:715af3660c73 130 }
vinbel93 20:f0932bfe09ed 131
manl2003 10:51ee22e230c7 132 }break;
manl2003 10:51ee22e230c7 133 }
manl2003 16:cf433716f8d6 134 _updateState(state);
manl2003 10:51ee22e230c7 135 }
manl2003 10:51ee22e230c7 136
manl2003 10:51ee22e230c7 137 bool MEF::preambleChecker()
manl2003 10:51ee22e230c7 138 {
manl2003 10:51ee22e230c7 139 bool temp = false;
manl2003 10:51ee22e230c7 140 bool resultTest1 = true, resultTest2 = true;
manl2003 10:51ee22e230c7 141 for(int i = 0; i < 8; i++)
manl2003 10:51ee22e230c7 142 {
manl2003 10:51ee22e230c7 143 if(m_InputBuffer[i] != temp)
manl2003 10:51ee22e230c7 144 {
manl2003 10:51ee22e230c7 145 resultTest1 = false;
manl2003 10:51ee22e230c7 146 }
manl2003 10:51ee22e230c7 147 if(m_InputBuffer[i] == temp)
manl2003 10:51ee22e230c7 148 {
manl2003 10:51ee22e230c7 149 resultTest2 = false;
manl2003 10:51ee22e230c7 150 }
manl2003 10:51ee22e230c7 151 temp = !temp;
manl2003 10:51ee22e230c7 152 }
manl2003 10:51ee22e230c7 153 return resultTest1 || resultTest2;
manl2003 10:51ee22e230c7 154 }
manl2003 10:51ee22e230c7 155
manl2003 10:51ee22e230c7 156 bool MEF::startChecker()
manl2003 10:51ee22e230c7 157 {
manl2003 10:51ee22e230c7 158 if(m_InputBuffer[0] == 0 && m_InputBuffer[1] == 1 && m_InputBuffer[2] == 1 && m_InputBuffer[3] == 1 && m_InputBuffer[4] == 1 && m_InputBuffer[5] == 1 && m_InputBuffer[6] == 1 && m_InputBuffer[7] == 0)
manl2003 10:51ee22e230c7 159 {
manl2003 10:51ee22e230c7 160 return true;
manl2003 10:51ee22e230c7 161 }
manl2003 10:51ee22e230c7 162 return false;
manl2003 10:51ee22e230c7 163 }
manl2003 10:51ee22e230c7 164
manl2003 10:51ee22e230c7 165 int MEF::calculateSize()
manl2003 10:51ee22e230c7 166 {
manl2003 10:51ee22e230c7 167 return (m_InputBuffer[0] << 7) | (m_InputBuffer[1] << 6) | (m_InputBuffer[2] << 5) | (m_InputBuffer[3] << 4) | (m_InputBuffer[4] << 3) | (m_InputBuffer[5] << 2) | (m_InputBuffer[6] << 1) | (m_InputBuffer[7] << 0);
manl2003 12:715af3660c73 168 }
manl2003 12:715af3660c73 169
manl2003 12:715af3660c73 170 bool MEF::compareCRC()
manl2003 12:715af3660c73 171 {
vinbel93 20:f0932bfe09ed 172 unsigned short incommingCRC = (m_InputBuffer[0] << 15) |
vinbel93 20:f0932bfe09ed 173 (m_InputBuffer[1] << 14) |
vinbel93 20:f0932bfe09ed 174 (m_InputBuffer[2] << 13) |
vinbel93 20:f0932bfe09ed 175 (m_InputBuffer[3] << 12) |
vinbel93 20:f0932bfe09ed 176 (m_InputBuffer[4] << 11) |
vinbel93 20:f0932bfe09ed 177 (m_InputBuffer[5] << 10) |
vinbel93 20:f0932bfe09ed 178 (m_InputBuffer[6] << 9) |
vinbel93 20:f0932bfe09ed 179 (m_InputBuffer[7] << 8) |
vinbel93 20:f0932bfe09ed 180 (m_InputBuffer[8] << 7) |
vinbel93 20:f0932bfe09ed 181 (m_InputBuffer[9] << 6) |
vinbel93 20:f0932bfe09ed 182 (m_InputBuffer[10] << 5) |
vinbel93 20:f0932bfe09ed 183 (m_InputBuffer[11] << 4) |
vinbel93 20:f0932bfe09ed 184 (m_InputBuffer[12] << 3) |
vinbel93 20:f0932bfe09ed 185 (m_InputBuffer[13] << 2) |
vinbel93 20:f0932bfe09ed 186 (m_InputBuffer[14] << 1) |
vinbel93 20:f0932bfe09ed 187 (m_InputBuffer[15] << 0);
vinbel93 20:f0932bfe09ed 188
manl2003 12:715af3660c73 189 return m_CRC == incommingCRC;
manl2003 12:715af3660c73 190 }
manl2003 12:715af3660c73 191
manl2003 12:715af3660c73 192 void MEF::error()
manl2003 12:715af3660c73 193 {
manl2003 12:715af3660c73 194
manl2003 10:51ee22e230c7 195 }