mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-23 08:27:44 +00:00
117 lines
2.7 KiB
C++
117 lines
2.7 KiB
C++
/*
|
|
* 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 "ert_packet.hpp"
|
|
|
|
#include "crc.hpp"
|
|
|
|
namespace ert {
|
|
|
|
size_t Packet::length() const {
|
|
return decoder_.symbols_count();
|
|
}
|
|
|
|
bool Packet::is_valid() const {
|
|
return true;
|
|
}
|
|
|
|
Timestamp Packet::received_at() const {
|
|
return packet_.timestamp();
|
|
}
|
|
|
|
Packet::Type Packet::type() const {
|
|
return type_;
|
|
}
|
|
|
|
ID Packet::id() const {
|
|
if( type() == Type::SCM ) {
|
|
const auto msb = reader_.read(0, 2);
|
|
const auto lsb = reader_.read(35, 24);
|
|
return (msb << 24) | lsb;
|
|
}
|
|
if( type() == Type::SCMPLUS ) {
|
|
return reader_.read(2 * 8, 32);
|
|
}
|
|
if( type() == Type::IDM ) {
|
|
return reader_.read(5 * 8, 32);
|
|
}
|
|
return invalid_id;
|
|
}
|
|
|
|
Consumption Packet::consumption() const {
|
|
if( type() == Type::SCM ) {
|
|
return reader_.read(11, 24);
|
|
}
|
|
if( type() == Type::SCMPLUS ) {
|
|
return reader_.read(6 * 8, 32);
|
|
}
|
|
if( type() == Type::IDM ) {
|
|
return reader_.read(25 * 8, 32);
|
|
}
|
|
return invalid_consumption;
|
|
}
|
|
|
|
CommodityType Packet::commodity_type() const {
|
|
if( type() == Type::SCM ) {
|
|
return reader_.read(5, 4);
|
|
}
|
|
if( type() == Type::SCMPLUS ) {
|
|
return reader_.read(1 * 8 + 4, 4);
|
|
}
|
|
if( type() == Type::IDM ) {
|
|
return reader_.read(4 * 8 + 4, 4);
|
|
}
|
|
return invalid_commodity_type;
|
|
}
|
|
|
|
FormattedSymbols Packet::symbols_formatted() const {
|
|
return format_symbols(decoder_);
|
|
}
|
|
|
|
bool Packet::crc_ok() const {
|
|
switch(type()) {
|
|
case Type::SCM: return crc_ok_scm();
|
|
case Type::SCMPLUS:
|
|
case Type::IDM: return crc_ok_ccitt();
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
bool Packet::crc_ok_scm() const {
|
|
CRC<16> ert_bch { 0x6f63 };
|
|
size_t start_bit = 5;
|
|
ert_bch.process_byte(reader_.read(0, start_bit));
|
|
for(size_t i=start_bit; i<length(); i+=8) {
|
|
ert_bch.process_byte(reader_.read(i, 8));
|
|
}
|
|
return ert_bch.checksum() == 0x0000;
|
|
}
|
|
|
|
bool Packet::crc_ok_ccitt() const {
|
|
CRC<16> ert_crc_ccitt { 0x1021, 0xffff, 0x1d0f };
|
|
for(size_t i=0; i<length(); i+=8) {
|
|
ert_crc_ccitt.process_byte(reader_.read(i, 8));
|
|
}
|
|
return ert_crc_ccitt.checksum() == 0x0000;
|
|
}
|
|
|
|
} /* namespace ert */
|