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LoRa: basic encoder and decoder

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f4exb
2020-02-12 17:56:41 +01:00
parent 60db0ab868
commit 5816285a12
9 changed files with 422 additions and 3 deletions
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plugins/channeltx/modlora/loramodencoder.cpp
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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 Edouard Griffiths, F4EXB //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include "loramodencoder.h"
const char LoRaModEncoder::asciiToTTYLetters[128] = {
// '\x00' '\x01' '\x02' '\x03' '\x04' '\x05' '\x06' '\x07'
0x00, -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// '\x08' '\t' '\n' '\x0b' '\x0c' '\r' '\x0e' '\x0f'
-1 , -1 , 0x02, -1 , -1 , 0x08, -1 , -1 ,
// '\x10' '\x11' '\x12' '\x13' '\x14' '\x15' '\x16' '\x17'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// '\x18' '\x19' '\x1a' '\x1b' '\x1c' '\x1d' '\x1e' '\x1f'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// ' ' '!' '"' '#' '$' '%' '&' "'"
0x04, -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// '(' ')' '*' '+' ',' '-' '.' '/'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// '0' '1' '2' '3' '4' '5' '6' '7'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// '8' '9' ':' ';' '<' '=' '>' '?'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// '@' 'A' 'B' 'C' 'D' 'E' 'F' 'G'
-1 , 0x03, 0x19, 0x0e, 0x09, 0x01, 0x0d, 0x1a,
// 'H' 'I' 'J' 'K' 'L' 'M' 'N' 'O'
0x14, 0x06, 0x0b, 0x0f, 0x12, 0x1c, 0x0c, 0x18,
// 'P' 'Q' 'R' 'S' 'T' 'U' 'V' 'W'
0x16, 0x17, 0x0a, 0x05, 0x10, 0x07, 0x1e, 0x13,
// 'X' 'Y' 'Z' '[' '\\' ']' '^' '_'
0x1d, 0x15, 0x11, -1 , -1 , -1 , -1 , -1 ,
// '`' 'a' 'b' 'c' 'd' 'e' 'f' 'g'
-1 , 0x03, 0x19, 0x0e, 0x09, 0x01, 0x0d, 0x1a,
// 'h' 'i' 'j' 'k' 'l' 'm' 'n' 'o'
0x14, 0x06, 0x0b, 0x0f, 0x12, 0x1c, 0x0c, 0x18,
// 'p' 'q' 'r' 's' 't' 'u' 'v' 'w'
0x16, 0x17, 0x0a, 0x05, 0x10, 0x07, 0x1e, 0x13,
// 'x' 'y' 'z' '{' '|' '}' '~' '\x7f'
0x1d, 0x15, 0x11, -1 , -1 , -1 , -1 , -1
};
const char LoRaModEncoder::asciiToTTYFigures[128] = {
// '\x00' '\x01' '\x02' '\x03' '\x04' '\x05' '\x06' '\x07'
0x00, -1 , -1 , -1 , -1 , -1 , -1 , 0x05,
// '\x08' '\t' '\n' '\x0b' '\x0c' '\r' '\x0e' '\x0f'
-1 , -1 , 0x02, -1 , -1 , 0x08, -1 , -1 ,
// '\x10' '\x11' '\x12' '\x13' '\x14' '\x15' '\x16' '\x17'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// '\x18' '\x19' '\x1a' '\x1b' '\x1c' '\x1d' '\x1e' '\x1f'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// ' ' '!' '"' '#' '$' '%' '&' "'"
0x04, 0x0d, 0x11, 0x14, 0x09, -1 , 0x1a, -1 ,
// '(' ')' '*' '+' ',' '-' '.' '/'
0x0f, 0x12, -1 , -1 , 0x0c, 0x03, 0x1c, 0x1d,
// '0' '1' '2' '3' '4' '5' '6' '7'
0x16, 0x17, 0x13, 0x01, 0x0a, 0x10, 0x15, 0x07,
// '8' '9' ':' ';' '<' '=' '>' '?'
0x06, 0x18, 0x0e, 0x1e, -1 , -1 , -1 , 0x19,
// '@' 'A' 'B' 'C' 'D' 'E' 'F' 'G'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// 'H' 'I' 'J' 'K' 'L' 'M' 'N' 'O'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// 'P' 'Q' 'R' 'S' 'T' 'U' 'V' 'W'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// 'X' 'Y' 'Z' '[' '\\' ']' '^' '_'
-1 , -1 , -1 , -1 , 0x0b, -1 , -1 , -1 ,
// '`' 'a' 'b' 'c' 'd' 'e' 'f' 'g'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// 'h' 'i' 'j' 'k' 'l' 'm' 'n' 'o'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// 'p' 'q' 'r' 's' 't' 'u' 'v' 'w'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 ,
// 'x' 'y' 'z' '{' '|' '}' '~' '\x7f'
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1
};
LoRaModEncoder::LoRaModEncoder() :
m_codingScheme(LoRaModSettings::CodingTTY),
m_nbSymbolBits(5)
{}
LoRaModEncoder::~LoRaModEncoder()
{}
void LoRaModEncoder::encodeString(const QString& str, std::vector<unsigned int>& symbols)
{
switch (m_codingScheme)
{
case LoRaModSettings::CodingTTY:
encodeStringTTY(str, symbols);
break;
case LoRaModSettings::CodingASCII:
encodeStringASCII(str, symbols);
break;
default:
break;
}
}
void LoRaModEncoder::encodeStringASCII(const QString& str, std::vector<unsigned int>& symbols)
{
if (m_nbSymbolBits != 7) {
return;
}
QByteArray asciiStr = str.toUtf8();
QByteArray::const_iterator it = asciiStr.begin();
for (; it != asciiStr.end(); ++it) {
symbols.push_back(*it & 0x7F);
}
}
void LoRaModEncoder::encodeStringTTY(const QString& str, std::vector<unsigned int>& symbols)
{
if (m_nbSymbolBits != 5) {
return;
}
TTYState ttyState = TTYLetters;
QByteArray asciiStr = str.toUtf8();
QByteArray::const_iterator it = asciiStr.begin();
for (; it != asciiStr.end(); ++it)
{
char asciiChar = *it & 0x7F;
int ttyLetter = asciiToTTYLetters[asciiChar];
int ttyFigure = asciiToTTYFigures[asciiChar];
if (ttyLetter < 0)
{
if (ttyFigure >= 0)
{
if (ttyState != TTYFigures)
{
symbols.push_back(ttyFigures);
ttyState = TTYFigures;
}
symbols.push_back(ttyFigure);
} // else skip
}
else
{
if (ttyFigure >= 0)
{
symbols.push_back(ttyFigure); // same TTY character no state change
}
else
{
if (ttyState != TTYLetters)
{
symbols.push_back(ttyLetters);
ttyState = TTYLetters;
}
symbols.push_back(ttyLetter);
}
}
}
}