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Extract Manchester decoder, formatter.

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This commit is contained in:
Jared Boone 2015-12-01 21:28:53 -08:00
parent 9a5655ad0e
commit 519f8cfebc
4 changed files with 135 additions and 75 deletions
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1
firmware/application/Makefile
View File

@ -170,6 +170,7 @@ CPPSRC = main.cpp \
spectrum_color_lut.cpp \
ais_baseband.cpp \
sd_card.cpp \
manchester.cpp \
../common/utility.cpp \
../common/chibios_cpp.cpp \
../common/debug.cpp \

57
firmware/application/manchester.cpp Normal file
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@ -0,0 +1,57 @@
/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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; either version 2, 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "manchester.hpp"
// TODO: SERIOUSLY!? Including this, just to use to_string_hex?! Refactor!!!1
#include "ui_widget.hpp"
ManchesterFormatted format_manchester(
const ManchesterDecoder& decoder
) {
const size_t payload_length_decoded = decoder.symbols_count();
const size_t payload_length_hex_characters = (payload_length_decoded + 3) / 4;
const size_t payload_length_symbols_rounded = payload_length_hex_characters * 4;
std::string hex_data;
std::string hex_error;
hex_data.reserve(payload_length_hex_characters);
hex_error.reserve(payload_length_hex_characters);
uint_fast8_t data = 0;
uint_fast8_t error = 0;
for(size_t i=0; i<payload_length_symbols_rounded; i++) {
const auto symbol = decoder[i];
data <<= 1;
data |= symbol.value;
error <<= 1;
error |= symbol.error;
if( (i & 3) == 3 ) {
hex_data += ui::to_string_hex(data & 0xf, 1);
hex_error += ui::to_string_hex(error & 0xf, 1);
}
}
return { hex_data, hex_error };
}

77
firmware/application/manchester.hpp Normal file
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@ -0,0 +1,77 @@
/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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; either version 2, 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __MANCHESTER_H__
#define __MANCHESTER_H__
#include <cstdint>
#include <cstddef>
#include <bitset>
#include <string>
class ManchesterDecoder {
public:
struct DecodedSymbol {
uint_fast8_t value;
uint_fast8_t error;
};
constexpr ManchesterDecoder(
const std::bitset<1024>& encoded,
const size_t count,
const size_t sense = 0
) : encoded { encoded },
count { count },
sense { sense }
{
}
DecodedSymbol operator[](const size_t index) const {
const size_t encoded_index = index * 2;
if( (encoded_index + 1) < count ) {
const auto value = encoded[encoded_index + sense];
const auto error = encoded[encoded_index + 0] == encoded[encoded_index + 1];
return { value, error };
} else {
return { 0, 1 };
}
}
size_t symbols_count() const {
return count / 2;
}
private:
const std::bitset<1024>& encoded;
const size_t count;
const size_t sense;
};
struct ManchesterFormatted {
const std::string data;
const std::string errors;
};
ManchesterFormatted format_manchester(
const ManchesterDecoder& decoder
);
#endif/*__MANCHESTER_H__*/

75
firmware/application/ui_receiver.cpp
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@ -497,81 +497,6 @@ ReceiverView::~ReceiverView() {
receiver_model.disable();
}
class ManchesterDecoder {
public:
struct DecodedSymbol {
uint_fast8_t value;
uint_fast8_t error;
};
constexpr ManchesterDecoder(
const std::bitset<1024>& encoded,
const size_t count,
const size_t sense = 0
) : encoded { encoded },
count { count },
sense { sense }
{
}
DecodedSymbol operator[](const size_t index) const {
const size_t encoded_index = index * 2;
if( (encoded_index + 1) < count ) {
const auto value = encoded[encoded_index + sense];
const auto error = encoded[encoded_index + 0] == encoded[encoded_index + 1];
return { value, error };
} else {
return { 0, 1 };
}
}
size_t symbols_count() const {
return count / 2;
}
private:
const std::bitset<1024>& encoded;
const size_t count;
const size_t sense;
};
struct ManchesterFormatted {
const std::string data;
const std::string errors;
};
static ManchesterFormatted format_manchester(
const ManchesterDecoder& decoder
) {
const size_t payload_length_decoded = decoder.symbols_count();
const size_t payload_length_hex_characters = (payload_length_decoded + 3) / 4;
const size_t payload_length_symbols_rounded = payload_length_hex_characters * 4;
std::string hex_data;
std::string hex_error;
hex_data.reserve(payload_length_hex_characters);
hex_error.reserve(payload_length_hex_characters);
uint_fast8_t data = 0;
uint_fast8_t error = 0;
for(size_t i=0; i<payload_length_symbols_rounded; i++) {
const auto symbol = decoder[i];
data <<= 1;
data |= symbol.value;
error <<= 1;
error |= symbol.error;
if( (i & 3) == 3 ) {
hex_data += to_string_hex(data & 0xf, 1);
hex_error += to_string_hex(error & 0xf, 1);
}
}
return { hex_data, hex_error };
}
class AnalogAudioModel {
public:
AnalogAudioModel(ReceiverModel::Mode mode) {