mayhem-firmware/firmware/application/tpms_app.cpp

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/*
* 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 "tpms_app.hpp"
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#include "event_m0.hpp"
#include "portapack_shared_memory.hpp"
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using namespace portapack;
#include "string_format.hpp"
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#include "crc.hpp"
#include "utility.hpp"
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namespace tpms {
namespace format {
std::string type(Reading::Type type) {
return to_string_dec_uint(toUType(type), 2);
}
std::string id(TransponderID id) {
return to_string_hex(id.value(), 8);
}
std::string pressure(Pressure pressure) {
return to_string_dec_int(pressure.kilopascal(), 3);
}
std::string temperature(Temperature temperature) {
return to_string_dec_int(temperature.celsius(), 3);
}
} /* namespace format */
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Timestamp Packet::received_at() const {
return packet_.timestamp();
}
ManchesterFormatted Packet::symbols_formatted() const {
return format_manchester(decoder_);
}
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Optional<Reading> Packet::reading() const {
const auto length = crc_valid_length();
switch(length) {
case 64:
return Reading {
Reading::Type::FLM_64,
reader_.read(0, 32),
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Pressure { static_cast<int>(reader_.read(32, 8)) * 4 / 3 },
Temperature { static_cast<int>(reader_.read(40, 8) & 0x7f) - 50 }
};
case 72:
return Reading {
Reading::Type::FLM_72,
reader_.read(0, 32),
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Pressure { static_cast<int>(reader_.read(40, 8)) * 4 / 3 },
Temperature { static_cast<int>(reader_.read(48, 8)) - 50 }
};
case 80:
return Reading {
Reading::Type::FLM_80,
reader_.read(8, 32),
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Pressure { static_cast<int>(reader_.read(48, 8)) * 4 / 3 },
Temperature { static_cast<int>(reader_.read(56, 8)) - 50 }
};
default:
return { };
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}
}
size_t Packet::crc_valid_length() const {
constexpr uint32_t checksum_bytes = 0b1111111;
constexpr uint32_t crc_72_bytes = 0b111111111;
constexpr uint32_t crc_80_bytes = 0b1111111110;
std::array<uint8_t, 10> bytes;
for(size_t i=0; i<bytes.size(); i++) {
bytes[i] = reader_.read(i * 8, 8);
}
uint32_t checksum = 0;
CRC<uint8_t> crc_72 { 0x01, 0x00 };
CRC<uint8_t> crc_80 { 0x01, 0x00 };
for(size_t i=0; i<bytes.size(); i++) {
const uint32_t byte_mask = 1 << i;
const auto byte = bytes[i];
if( checksum_bytes & byte_mask ) {
checksum += byte;
}
if( crc_72_bytes & byte_mask ) {
crc_72.process_byte(byte);
}
if( crc_80_bytes & byte_mask ) {
crc_80.process_byte(byte);
}
}
if( crc_80.checksum() == 0 ) {
return 80;
} else if( crc_72.checksum() == 0 ) {
return 72;
} else if( (checksum & 0xff) == bytes[7] ) {
return 64;
} else {
return 0;
}
}
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} /* namespace tpms */
void TPMSLogger::on_packet(const tpms::Packet& packet, const uint32_t target_frequency) {
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const auto hex_formatted = packet.symbols_formatted();
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if( log_file.is_ready() ) {
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// TODO: function doesn't take uint64_t, so when >= 1<<32, weirdness will ensue!
const auto tuning_frequency_str = to_string_dec_uint(target_frequency, 10);
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std::string entry = tuning_frequency_str + " FSK 38.4 19.2 " + hex_formatted.data + "/" + hex_formatted.errors;
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log_file.write_entry(packet.received_at(), entry);
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}
}
const TPMSRecentEntry::Key TPMSRecentEntry::invalid_key = { tpms::Reading::Type::None, 0 };
void TPMSRecentEntry::update(const tpms::Reading& reading) {
received_count++;
if( reading.pressure().is_valid() ) {
last_pressure = reading.pressure();
}
if( reading.temperature().is_valid() ) {
last_temperature = reading.temperature();
}
}
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namespace ui {
static const std::array<std::pair<std::string, size_t>, 5> tpms_columns { {
{ "Tp", 2 },
{ "ID", 8 },
{ "kPa", 3 },
{ "C", 3 },
{ "Cnt", 3 },
} };
template<>
void RecentEntriesView<TPMSRecentEntries>::draw_header(
const Rect& target_rect,
Painter& painter,
const Style& style
) {
auto x = 0;
for(const auto& column : tpms_columns) {
const auto width = column.second;
auto text = column.first;
if( width > text.length() ) {
text.append(width - text.length(), ' ');
}
painter.draw_string({ x, target_rect.pos.y }, style, text);
x += (width * 8) + 8;
}
}
template<>
void RecentEntriesView<TPMSRecentEntries>::draw(
const Entry& entry,
const Rect& target_rect,
Painter& painter,
const Style& style,
const bool is_selected
) {
const auto& draw_style = is_selected ? style.invert() : style;
std::string line = tpms::format::type(entry.type) + " " + tpms::format::id(entry.id);
if( entry.last_pressure.is_valid() ) {
line += " " + tpms::format::pressure(entry.last_pressure.value());
} else {
line += " " " ";
}
if( entry.last_temperature.is_valid() ) {
line += " " + tpms::format::temperature(entry.last_temperature.value());
} else {
line += " " " ";
}
if( entry.received_count > 999 ) {
line += " +++";
} else {
line += " " + to_string_dec_uint(entry.received_count, 3);
}
line.resize(target_rect.width() / 8, ' ');
painter.draw_string(target_rect.pos, draw_style, line);
}
TPMSAppView::TPMSAppView(NavigationView&) {
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add_children({ {
&recent_entries_view,
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} });
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EventDispatcher::message_map().register_handler(Message::ID::TPMSPacket,
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[this](Message* const p) {
const auto message = static_cast<const TPMSPacketMessage*>(p);
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const tpms::Packet packet { message->packet };
this->on_packet(packet);
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}
);
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radio::set_tuning_frequency(tuning_frequency());
radio::set_rf_amp(false);
radio::set_lna_gain(32);
radio::set_vga_gain(32);
radio::set_baseband_rate(sampling_rate);
radio::set_baseband_decimation_by(1);
radio::set_baseband_filter_bandwidth(baseband_bandwidth);
radio::set_direction(rf::Direction::Receive);
BasebandConfigurationMessage message { {
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.mode = 5,
.sampling_rate = 2457600,
.decimation_factor = 1,
} };
shared_memory.baseband_queue.push(message);
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}
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TPMSAppView::~TPMSAppView() {
shared_memory.baseband_queue.push_and_wait(
BasebandConfigurationMessage {
.configuration = { },
}
);
radio::disable();
EventDispatcher::message_map().unregister_handler(Message::ID::TPMSPacket);
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}
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void TPMSAppView::focus() {
recent_entries_view.focus();
}
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void TPMSAppView::set_parent_rect(const Rect new_parent_rect) {
View::set_parent_rect(new_parent_rect);
recent_entries_view.set_parent_rect({ 0, 0, new_parent_rect.width(), new_parent_rect.height() });
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}
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void TPMSAppView::on_packet(const tpms::Packet& packet) {
logger.on_packet(packet, target_frequency());
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const auto reading_opt = packet.reading();
if( reading_opt.is_valid() ) {
const auto reading = reading_opt.value();
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recent.on_packet({ reading.type(), reading.id() }, reading);
recent_entries_view.set_dirty();
}
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}
void TPMSAppView::on_show_list() {
recent_entries_view.hidden(false);
recent_entries_view.focus();
}
uint32_t TPMSAppView::target_frequency() const {
return initial_target_frequency;
}
uint32_t TPMSAppView::tuning_frequency() const {
return target_frequency() - (sampling_rate / 4);
}
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} /* namespace ui */