mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2026-08-21 23:19:02 +00:00
Arne Luehrs
c7a0846645
* EPIRB RX: add receiver-overload indicator on channel bar Tint the channel-power bar red when the front-end overloads (ADC near full scale). EPIRB demodulation relies on the constant-envelope carrier and the +/-1.1 rad biphase phase jumps; ADC clipping distorts both, so a visible cue to reduce RF-amp/LNA/VGA gain is useful. Implemented in the shared ui::Channel widget via an opt-in set_overload_threshold(): when the last ChannelStatistics max_db reaches the threshold the bar is drawn red instead of blue. Default threshold is above the 0 dBFS ceiling, so all existing users are unaffected. The EPIRB view enables it at -3 dBFS. Done in the widget (main firmware) rather than the EPIRB app because the epirb_rx external app is already at the 32 KB flash limit; the app only pays for a single setter call.
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __UI_CHANNEL_H__
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#define __UI_CHANNEL_H__
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#include "ui.hpp"
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#include "ui_widget.hpp"
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#include "ui_painter.hpp"
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#include "event_m0.hpp"
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#include "message.hpp"
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#include <cstdint>
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namespace ui {
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class Channel : public Widget {
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public:
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Channel(
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const Rect parent_rect)
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: Widget{parent_rect},
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max_db_{-120} {
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}
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void paint(Painter& painter) override;
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// Opt-in receiver-overload tint: when the channel power (peak IQ magnitude
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// in dBFS, 0 = full scale) reaches this threshold the bar is drawn red
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// instead of blue, flagging that the analog gain is too high and the ADC is
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// clipping. Default is disabled (threshold above the 0 dBFS ceiling) so
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// existing users are unaffected.
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void set_overload_threshold(int32_t db) {
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overload_threshold_ = db;
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set_dirty();
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}
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private:
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int32_t max_db_;
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int32_t overload_threshold_{INT32_MAX};
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MessageHandlerRegistration message_handler_stats{
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Message::ID::ChannelStatistics,
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[this](const Message* const p) {
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this->on_statistics_update(static_cast<const ChannelStatisticsMessage*>(p)->statistics);
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}};
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void on_statistics_update(const ChannelStatistics& statistics);
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};
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} // namespace ui
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#endif /*__UI_CHANNEL_H__*/
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