Level meter (#827)

* added possibility to scale vertically from bottom to top

* Squeleton of Level app from Recon App

* Working LevelApp

* Tweaking peak and display or RSSI chart

* Moved widgets, prepared audio decode, added working ctcss display and peak hold max rssi val

* Added RSSIGraph

* Updated Level to use RSSIGraph

* Graph as lines instead as bars

* correct CTCSS hiding if not in NFM mode

* added back db value and drawing for it. clamped to [-100,20] db

* added back audio, volume, better placement for buttons, db graph

* Using different icon for Level app, unless someone provide a better one

* fixed CTCSS position

---------

Co-authored-by: GullCode <gullradriel@hotmail.com>

firmware/application/CMakeLists.txt

@@ -274,6 +274,7 @@ set(CPPSRC
 	apps/soundboard_app.cpp
 	apps/ui_recon.cpp  
 	apps/ui_recon_settings.cpp
+	apps/ui_level.cpp  
 	apps/tpms_app.cpp
 	apps/tpms_app.cpp
 	protocols/aprs.cpp

firmware/application/apps/ui_level.cpp

@@ -0,0 +1,299 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2018 Furrtek
+ *
+ * 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 "ui_level.hpp"
+#include "ui_fileman.hpp"
+#include "file.hpp"
+
+using namespace portapack;
+using portapack::memory::map::backup_ram;
+
+namespace ui {
+
+    bool LevelView::check_sd_card()
+    {
+        return (sd_card::status() == sd_card::Status::Mounted) ? true : false;
+    }
+
+    void LevelView::focus() {
+        button_frequency.focus();
+    }
+
+    LevelView::~LevelView() {
+
+        // save app settings
+        app_settings.lna = field_lna.value();
+        app_settings.vga = field_vga.value();
+        app_settings.rx_amp = field_rf_amp.value();
+
+        settings.save("level", &app_settings);
+
+        receiver_model.disable();
+        baseband::shutdown();
+    }
+
+    LevelView::LevelView( NavigationView& nav) : nav_ { nav } {
+
+        add_children( {
+                &labels,
+                &field_lna,
+                &field_vga,
+                &field_rf_amp,
+                &field_volume,
+                &field_bw,
+                &field_mode,
+                &step_mode,
+                &button_frequency,
+                &text_ctcss,
+                &freq_stats_rssi,
+                &freq_stats_db,
+                &audio_mode,
+                &peak_mode,
+                &rssi,
+                &rssi_graph
+                } );
+
+        rssi.set_vertical_rssi( true );
+
+        field_volume.on_change = [this](int32_t v) { this->on_headphone_volume_changed(v);	};
+        field_volume.set_value((receiver_model.headphone_volume() - audio::headphone::volume_range().max).decibel() + 99);
+
+        // Level directory
+        if( check_sd_card() ) {                     // Check to see if SD Card is mounted
+            make_new_directory( u"/LEVEL" );
+            sd_card_mounted = true ;
+        }
+
+        change_mode(NFM_MODULATION);	//Start on AM
+        field_mode.set_by_value(NFM_MODULATION);	//Reflect the mode into the manual selector
+
+        //HELPER: Pre-setting a manual range, based on stored frequency
+        freq = persistent_memory::tuned_frequency();
+        receiver_model.set_tuning_frequency( freq );
+        button_frequency.set_text( "<" + to_string_short_freq( freq ) + " MHz>" );
+
+        // load auto common app settings
+        if( sd_card_mounted )
+        {
+            auto rc = settings.load("level", &app_settings);
+            if(rc == SETTINGS_OK) {
+                field_lna.set_value(app_settings.lna);
+                field_vga.set_value(app_settings.vga);
+                field_rf_amp.set_value(app_settings.rx_amp);
+                receiver_model.set_rf_amp(app_settings.rx_amp);
+            }
+        }
+
+        button_frequency.on_select = [this, &nav](ButtonWithEncoder& button) {
+            auto new_view = nav_.push<FrequencyKeypadView>(freq);
+            new_view->on_changed = [this, &button](rf::Frequency f) {
+                freq = f ;
+                receiver_model.set_tuning_frequency( f );	// Retune to actual freq
+                button_frequency.set_text( "<" + to_string_short_freq( freq ) + " MHz>" );
+            };
+        };
+
+        button_frequency.on_change = [this]() {
+            int64_t def_step = freqman_entry_get_step_value( step_mode.selected_index() );
+            freq = freq + ( button_frequency.get_encoder_delta() * def_step );
+            if( freq < 1 )
+            {
+                freq = 1 ;
+            }
+            if( freq > ( MAX_UFREQ - def_step ) )
+            {
+                freq = MAX_UFREQ ;
+            }
+            button_frequency.set_encoder_delta( 0 );
+
+            receiver_model.set_tuning_frequency( freq );	// Retune to actual freq
+            button_frequency.set_text( "<" + to_string_short_freq( freq ) + " MHz>" );
+        };
+
+        field_mode.on_change = [this](size_t, OptionsField::value_t v) {
+            if( v != -1 )
+            {
+                receiver_model.disable();
+                baseband::shutdown();
+                change_mode(v);
+                if( audio_mode.selected_index() != 0 )
+                {
+                    audio::output::start();								
+                }
+                receiver_model.enable();
+            }
+        };
+
+        audio_mode.on_change = [this](size_t, OptionsField::value_t v) {
+            if( v == 0 )
+            {
+                audio::output::stop();
+            }
+            else if( v == 1 )
+            {
+                audio::output::start();
+                this->on_headphone_volume_changed( (receiver_model.headphone_volume() - audio::headphone::volume_range().max).decibel() + 99 );
+            }
+            else
+            {
+
+            }
+        };
+
+
+        peak_mode.on_change = [this](size_t, OptionsField::value_t v) {
+            if( v == 0 )
+            {
+                rssi.set_peak( false , 0 );
+            }
+            else
+            {
+                rssi.set_peak( true , v );
+            }
+        };
+
+        // default peak value 
+        peak_mode.set_selected_index(1);
+        //FILL STEP OPTIONS
+        freqman_set_modulation_option( field_mode );
+        freqman_set_step_option_short( step_mode );
+        freq_stats_rssi.set_style(&style_white);
+        freq_stats_db.set_style(&style_white);
+    }
+
+    void LevelView::on_headphone_volume_changed(int32_t v) {
+        const auto new_volume = volume_t::decibel(v - 99) + audio::headphone::volume_range().max;
+        receiver_model.set_headphone_volume(new_volume);
+    }
+
+
+    void LevelView::on_statistics_update(const ChannelStatistics& statistics) {
+        static int last_max_db = -1000 ;
+        static int last_min_rssi = -1000 ;
+        static int last_avg_rssi = -1000 ;
+        static int last_max_rssi = -1000 ;
+
+        rssi_graph.add_values( rssi.get_min() , rssi.get_avg() , rssi.get_max() , statistics.max_db );
+
+        bool refresh_db = false ;
+        bool refresh_rssi = false ;
+
+        if(  last_max_db != statistics.max_db )
+        {
+            refresh_db = true ;
+        }
+        if( last_min_rssi != rssi.get_min() || last_avg_rssi != rssi.get_avg() || last_max_rssi != rssi.get_max() )
+        {
+            refresh_rssi = true ;
+        }
+        if( refresh_db )
+        {
+            last_max_db =  statistics.max_db ;
+            freq_stats_db.set( "Power: "+to_string_dec_int( statistics.max_db )+" db" );
+        }
+        if( refresh_rssi )
+        {
+            last_min_rssi = rssi.get_min();
+            last_avg_rssi = rssi.get_avg();
+            last_max_rssi = rssi.get_max();
+            freq_stats_rssi.set( "RSSI: "+to_string_dec_int( rssi.get_min() )+"/"+to_string_dec_int( rssi.get_avg() )+"/"+to_string_dec_int( rssi.get_max() )+" db" );
+        }
+    } /* on_statistic_updates */
+
+    size_t LevelView::change_mode( freqman_index_t new_mod ) { 
+
+        field_bw.on_change = [this](size_t n, OptionsField::value_t) { (void)n;	};
+
+        switch( new_mod ) {
+            case AM_MODULATION:
+                freqman_set_bandwidth_option( new_mod , field_bw );
+                //bw DSB (0) default
+                field_bw.set_selected_index(0);
+                baseband::run_image(portapack::spi_flash::image_tag_am_audio);
+                receiver_model.set_modulation(ReceiverModel::Mode::AMAudio);
+                receiver_model.set_am_configuration(field_bw.selected_index());
+                field_bw.on_change = [this](size_t n, OptionsField::value_t) { receiver_model.set_am_configuration(n);	};
+                receiver_model.set_sampling_rate(3072000);	receiver_model.set_baseband_bandwidth(1750000);
+                text_ctcss.set("             ");
+                break;
+            case NFM_MODULATION:
+                freqman_set_bandwidth_option( new_mod , field_bw );
+                //bw 16k (2) default
+                field_bw.set_selected_index(2);
+                baseband::run_image(portapack::spi_flash::image_tag_nfm_audio);
+                receiver_model.set_modulation(ReceiverModel::Mode::NarrowbandFMAudio);
+                receiver_model.set_nbfm_configuration(field_bw.selected_index());
+                field_bw.on_change = [this](size_t n, OptionsField::value_t) { 	receiver_model.set_nbfm_configuration(n); };
+                receiver_model.set_sampling_rate(3072000);	receiver_model.set_baseband_bandwidth(1750000);
+                break;
+            case WFM_MODULATION:
+                freqman_set_bandwidth_option( new_mod , field_bw );
+                //bw 200k (0) only/default
+                field_bw.set_selected_index(0);
+                baseband::run_image(portapack::spi_flash::image_tag_wfm_audio);
+                receiver_model.set_modulation(ReceiverModel::Mode::WidebandFMAudio);
+                receiver_model.set_wfm_configuration(field_bw.selected_index());
+                field_bw.on_change = [this](size_t n, OptionsField::value_t) {	receiver_model.set_wfm_configuration(n); };
+                receiver_model.set_sampling_rate(3072000);	receiver_model.set_baseband_bandwidth(1750000);
+                text_ctcss.set("             ");
+                break;
+            default:
+                break;
+        }
+        return step_mode.selected_index();
+    }
+
+
+    void LevelView::handle_coded_squelch(const uint32_t value) {
+        static int32_t last_idx = -1 ;
+
+        float diff, min_diff = value;
+        size_t min_idx { 0 };
+        size_t c;
+
+        if( field_mode.selected_index() != NFM_MODULATION )
+        {
+            text_ctcss.set("             ");
+            return ;
+        }
+
+        // Find nearest match
+        for (c = 0; c < tone_keys.size(); c++) {
+            diff = abs(((float)value / 100.0) - tone_keys[c].second);
+            if (diff < min_diff) {
+                min_idx = c;
+                min_diff = diff;
+            }
+        }
+
+        // Arbitrary confidence threshold
+        if( last_idx < 0 || (unsigned)last_idx != min_idx )
+        {
+            last_idx = min_idx ;
+            if (min_diff < 40)
+                text_ctcss.set(tone_keys[min_idx].first);
+            else
+                text_ctcss.set("             ");
+        }
+    }
+
+} /* namespace ui */

firmware/application/apps/ui_level.hpp

@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2018 Furrtek
+ *
+ * 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 _UI_LEVEL
+#define _UI_LEVEL
+
+#include "ui.hpp"
+#include "receiver_model.hpp"
+#include "ui_receiver.hpp"
+#include "ui_font_fixed_8x16.hpp"
+#include "freqman.hpp"
+#include "analog_audio_app.hpp"
+#include "audio.hpp"
+#include "ui_mictx.hpp"
+#include "portapack_persistent_memory.hpp"
+#include "baseband_api.hpp"
+#include "ui_spectrum.hpp"
+#include "string_format.hpp"
+#include "file.hpp"
+#include "app_settings.hpp"
+
+
+namespace ui {
+
+    class LevelView : public View {
+        public:
+            LevelView(NavigationView& nav);
+            ~LevelView();
+
+            void focus() override;
+	    
+            void big_display_freq( int64_t f );
+
+	        void on_audio_spectrum(const AudioSpectrum* spectrum);
+
+            const Style style_grey {		// level
+                .font = font::fixed_8x16,
+                    .background = Color::black(),
+                    .foreground = Color::grey(),
+            };
+
+            const Style style_white {		// level
+                .font = font::fixed_8x16,
+                    .background = Color::black(),
+                    .foreground = Color::white(),
+            };
+
+            const Style style_yellow {		//Found signal
+                .font = font::fixed_8x16,
+                    .background = Color::black(),
+                    .foreground = Color::yellow(),
+            };
+
+            const Style style_green {		//Found signal
+                .font = font::fixed_8x16,
+                    .background = Color::black(),
+                    .foreground = Color::green(),
+            };
+
+            const Style style_red {		//erasing freq
+                .font = font::fixed_8x16,
+                    .background = Color::black(),
+                    .foreground = Color::red(),
+            };
+
+            const Style style_blue {		// quick level, wait == 0
+                .font = font::fixed_8x16,
+                    .background = Color::black(),
+                    .foreground = Color::blue(),
+            };
+
+            std::string title() const override { return "Level"; };
+
+        private:
+            NavigationView& nav_;
+
+            size_t change_mode( freqman_index_t mod_type);
+            void on_statistics_update(const ChannelStatistics& statistics);
+            void set_display_freq( int64_t freq );
+            bool check_sd_card();
+
+            int32_t db { 0 };
+            long long int MAX_UFREQ = { 7200000000 }; // maximum usable freq
+            bool sd_card_mounted = false ;
+            rf::Frequency freq = { 0 } ;
+
+            Labels labels 
+            { 
+                { { 0  * 8 , 0  * 16      }, "LNA:   VGA:   AMP:  VOL:     ", Color::light_grey() },
+                    { { 0  * 8 , 1  * 16      }, "BW:       MODE:    S:   ", Color::light_grey() },
+            };
+
+            LNAGainField field_lna {
+                { 4 * 8, 0 * 16 }
+            };
+
+            VGAGainField field_vga {
+                { 11 * 8, 0 * 16 }
+            };
+
+            RFAmpField field_rf_amp {
+                { 18 * 8, 0 * 16 }
+            };
+
+            NumberField field_volume {
+                { 24 * 8, 0 * 16 },
+                    2,
+                    { 0, 99 },
+                    1,
+                    ' ',
+            };
+
+            OptionsField field_bw {
+                { 3 * 8, 1 * 16 },
+                    6,
+                    { }
+            };		
+
+            OptionsField field_mode {
+                { 15 * 8, 1 * 16 },
+                    3,
+                    {
+                    }
+            };
+
+            OptionsField step_mode {
+                { 21 * 8, 1 * 16 },
+                    12,
+                    {
+                    }
+            };
+            
+            RSSIGraph rssi_graph { // 240x320  => 
+                { 0 , 5 * 16 + 4 , 240 - 5 * 8 , 320 - 5 * 16 - 4 },
+            }; 
+
+            RSSI rssi { // 240x320  => 
+                { 240 - 5 * 8 , 5 * 16 + 4 , 5 * 8 , 320 - 5 * 16 - 4 },
+            }; 
+
+
+            ButtonWithEncoder button_frequency {
+                { 0 * 8 , 2 * 16 + 8 , 15 * 8 , 1 * 8 },
+                    ""
+            };
+
+            OptionsField audio_mode {
+                { 16 * 8, 2 * 16 + 4 },
+                    9,
+                    {
+                        {"audio off", 0},
+                        {"audio on",1}
+                        //{"tone on", 2},
+                        //{"tone off", 2},
+                    }
+            };		
+
+
+            Text text_ctcss {
+                { 20 * 8, 3 * 16 + 4 , 14 * 8, 1 * 8 },
+                    ""
+            };
+
+            Text freq_stats_rssi {		
+                { 0 * 8 , 3 * 16 + 4 , 20 * 8, 16 },
+            };
+
+            Text freq_stats_db {		
+                { 0 * 8 , 4 * 16 + 4 , 15 * 8, 16 },
+            };
+
+           
+            OptionsField peak_mode {
+                { 44 + 10 * 8, 4 * 16 + 4 },
+                    10,
+                    {
+                        {"peak:none", 0},
+                        {"peak:0.25s",250},
+                        {"peak:0.5s",500},
+                        {"peak:1s",1000},
+                        {"peak:3s",3000},
+                        {"peak:5s",5000},
+                        {"peak:10s",10000},
+                    }
+            };		
+
+            void handle_coded_squelch(const uint32_t value);
+            void on_headphone_volume_changed(int32_t v);
+
+            MessageHandlerRegistration message_handler_coded_squelch {
+                Message::ID::CodedSquelch,
+                    [this](const Message* const p) {
+                        const auto message = *reinterpret_cast<const CodedSquelchMessage*>(p);
+                        this->handle_coded_squelch(message.value);
+                    }
+            };
+
+            MessageHandlerRegistration message_handler_stats {
+                Message::ID::ChannelStatistics,
+                    [this](const Message* const p) {
+                        this->on_statistics_update(static_cast<const ChannelStatisticsMessage*>(p)->statistics);
+                    }
+            };
+            // app save settings
+            std::app_settings settings { }; 		
+            std::app_settings::AppSettings app_settings { };
+    };
+
+} /* namespace ui */
+
+#endif

firmware/application/ui/ui_rssi.cpp

@@ -26,6 +26,10 @@
 
 #include <algorithm>
 
+#define min(a,b) ((a)<(b)?(a):(b))
+#define max(a,b) ((a)>(b)?(a):(b))
+#define abs(x) ((x)>0?(x):-(x))
+
 namespace ui {
 
     void RSSI::paint(Painter& painter) {
@@ -38,43 +42,122 @@ void RSSI::paint(Painter& painter) {
         constexpr int raw_min = rssi_sample_range * rssi_voltage_min / adc_voltage_max;
         constexpr int raw_max = rssi_sample_range * rssi_voltage_max / adc_voltage_max;
         constexpr int raw_delta = raw_max - raw_min;
+
+
+        if( !vertical_rssi_enabled )
+        {
+            // horizontal left to right level meters
             const range_t<int> x_avg_range { 0, r.width() - 1 };
             const auto x_avg = x_avg_range.clip((avg_ - raw_min) * r.width() / raw_delta);
             const range_t<int> x_min_range { 0, x_avg };
             const auto x_min = x_min_range.clip((min_ - raw_min) * r.width() / raw_delta);
-	const range_t<int> x_max_range { x_avg + 1, r.width() };
+            const range_t<int> x_max_range { x_avg + 1, r.width() - 1 };
             const auto x_max = x_max_range.clip((max_ - raw_min) * r.width() / raw_delta);
+            const auto peak =  x_max_range.clip((peak_ - raw_min) * r.width() / raw_delta);
 
+            // x_min
             const Rect r0 { r.left(), r.top(), x_min, r.height() };
             painter.fill_rectangle(
                     r0,
                     Color::blue()
                     );
 
+            // x_avg
             const Rect r1 { r.left() + x_min, r.top(), x_avg - x_min, r.height() };
             painter.fill_rectangle(
                     r1,
                     Color::red()
                     );
 
+            // x_avg middle marker
             const Rect r2 { r.left() + x_avg, r.top(), 1, r.height() };
             painter.fill_rectangle(
                     r2,
                     Color::white()
                     );
 
+            // x_max
             const Rect r3 { r.left() + x_avg + 1, r.top(), x_max - (x_avg + 1), r.height() };
             painter.fill_rectangle(
                     r3,
                     Color::red()
                     );
 
+            // filling last part in black
             const Rect r4 { r.left() + x_max, r.top(), r.width() - x_max, r.height() };
             painter.fill_rectangle(
                     r4,
                     Color::black()
                     );
 
+            // show green peak value 
+            if( peak_enabled )
+            {
+                const Rect r5 { r.left(), r.bottom() + peak , r.width() , 1 };
+                painter.fill_rectangle(
+                        r5,
+                        Color::green()
+                        );
+            }
+        }
+        else
+        {
+            // vertical bottom to top level meters
+            const range_t<int> y_avg_range { 0, r.height() - 1 };
+            const auto y_avg = y_avg_range.clip((avg_ - raw_min) * r.height() / raw_delta);
+            const range_t<int> y_min_range { 0, y_avg };
+            const auto y_min = y_min_range.clip((min_ - raw_min) * r.height() / raw_delta);
+            const range_t<int> y_max_range { y_avg + 1, r.height() - 1 };
+            const auto y_max = y_max_range.clip((max_ - raw_min) * r.height() / raw_delta);
+            const range_t<int> peak_range { 0, r.height() - 1 };
+            const auto peak =  peak_range.clip((peak_ - raw_min) * r.height() / raw_delta);
+
+            // y_min
+            const Rect r0 { r.left(), r.bottom() - y_min, r.width() , y_min };
+            painter.fill_rectangle(
+                    r0,
+                    Color::blue()
+                    );
+
+            // y_avg
+            const Rect r1 { r.left(), r.bottom() - y_avg , r.width() , y_avg - y_min };
+            painter.fill_rectangle(
+                    r1,
+                    Color::red()
+                    );
+
+            // y_avg middle marker
+            const Rect r2 { r.left(), r.bottom() - y_avg , r.width() , 1 };
+            painter.fill_rectangle(
+                    r2,
+                    Color::white()
+                    );
+
+            // y_max
+            const Rect r3 {  r.left(), r.bottom() - y_max , r.width() , y_max - y_avg };
+            //const Rect r3 {  r.left(), r.bottom() - y_max , r.width() , y_max - y_avg - 1 };
+            painter.fill_rectangle(
+                    r3,
+                    Color::red()
+                    );
+
+            // fill last part of level in black
+            const Rect r4 { r.left(), r.top() , r.width() , r.height() - y_max };
+            painter.fill_rectangle(
+                    r4,
+                    Color::black()
+                    );
+
+            // show green peak value if enabled
+            if( peak_enabled )
+            {
+                const Rect r5 { r.left(), r.bottom() - peak , r.width() , 1 };
+                painter.fill_rectangle(
+                        r5,
+                        Color::green()
+                        );
+            }
+        }
         if (pitch_rssi_enabled) {
             baseband::set_pitch_rssi((avg_ - raw_min) * 2000 / raw_delta, true);
         }
@@ -100,11 +183,129 @@ void RSSI::set_pitch_rssi(bool enabled) {
         if (!enabled) baseband::set_pitch_rssi(0, false);
     }
 
+    void RSSI::set_vertical_rssi(bool enabled) {
+        if( enabled )
+            vertical_rssi_enabled = true ;
+        else
+            vertical_rssi_enabled = false ;
+    }
+
+    void RSSI::set_peak(bool enabled, size_t duration) {
+        peak_enabled = enabled ;
+        peak_duration = duration ;
+    }
+
     void RSSI::on_statistics_update(const RSSIStatistics& statistics) {
         min_ = statistics.min;
         avg_ = statistics.accumulator / statistics.count;
         max_ = statistics.max;
+        if( peak_enabled )
+        {
+            peak_duration_ = peak_duration_ + 100 ;
+            if( max_ > peak_ )
+            {
+                peak_ = max_ ;
+            }
+            if( peak_duration_ > peak_duration )
+            {
+                peak_duration_ = 0 ;
+                peak_ = max_ ;
+            }
+        }
         set_dirty();
     }
 
+
+    void RSSIGraph::paint(Painter& painter) {
+        const auto r = screen_rect();
+
+        for ( int n = 2 ; (unsigned)n <= graph_list.size(); n++) {
+            auto& entry = graph_list[graph_list.size()-n];
+            auto& prev_entry = graph_list[graph_list.size()-(n-1)];
+
+            // black
+            const Point p0{ r.right() - n , r.top() };
+            painter.draw_vline(
+                    p0,
+                    r.height(),
+                    Color::black());
+
+            // y_max
+            int32_t top_y_val = max( entry.rssi_max , prev_entry.rssi_max );
+            int32_t width_y = abs(  entry.rssi_max - prev_entry.rssi_max  );
+            if( width_y == 0 )
+                width_y = 1 ;
+            const Point p1{ r.right() - n , r.bottom() - top_y_val };
+            painter.draw_vline(
+                    p1,
+                    width_y,
+                    Color::red());
+
+            // y_avg    
+            top_y_val = max( entry.rssi_avg , prev_entry.rssi_avg );
+            width_y = abs(  entry.rssi_avg - prev_entry.rssi_avg  );
+            if( width_y == 0 )
+                width_y = 1 ;
+            const Point p2{ r.right() - n , r.bottom() - top_y_val };
+            painter.draw_vline(
+                    p2,
+                    width_y,
+                    Color::white());
+
+            // y_min
+            top_y_val = max( entry.rssi_min , prev_entry.rssi_min );
+            width_y = abs(  entry.rssi_min - prev_entry.rssi_min  );
+            if( width_y == 0 )
+                width_y = 1 ;
+            const Point p3{ r.right() - n , r.bottom() - top_y_val };
+            painter.draw_vline(
+                    p3,
+                    width_y,
+                    Color::blue());
+
+            // hack to display db
+            top_y_val = max( entry.db , prev_entry.db );
+            width_y = abs(  entry.db - prev_entry.db );
+            if( width_y == 0 )
+                width_y = 1 ;
+            const Point p4{ r.right() - n , r.bottom() - top_y_val };
+            painter.draw_vline(
+                    p4,
+                    width_y,
+                    Color::green());
+        }
+    }
+
+    void RSSIGraph::add_values(int32_t rssi_min, int32_t rssi_avg, int32_t rssi_max, int32_t db )
+    {
+        const auto r = screen_rect();
+
+        constexpr int rssi_sample_range = 256;
+        constexpr float rssi_voltage_min = 0.4;
+        constexpr float rssi_voltage_max = 2.2;
+        constexpr float adc_voltage_max = 3.3;
+        constexpr int raw_min = rssi_sample_range * rssi_voltage_min / adc_voltage_max;
+        constexpr int raw_max = rssi_sample_range * rssi_voltage_max / adc_voltage_max;
+        constexpr int raw_delta = raw_max - raw_min;
+
+        // vertical bottom to top level meters
+        const range_t<int> y_avg_range { 0, r.height() - 1 };
+        const auto y_avg = y_avg_range.clip((rssi_avg - raw_min) * r.height() / raw_delta);
+        const range_t<int> y_min_range { 0, y_avg };
+        const auto y_min = y_min_range.clip((rssi_min - raw_min) * r.height() / raw_delta);
+        const range_t<int> y_max_range { y_avg + 1, r.height() - 1 };
+        const auto y_max = y_max_range.clip((rssi_max - raw_min) * r.height() / raw_delta);
+        const range_t<int> db_range { -100 , 20 };
+        auto db_ = db_range.clip( db );
+        db_ = db_ - 20 ;
+        db_ = db_ * r.height() / 120 ;
+        db_ = r.height() + db_ ;
+
+        graph_list . push_back( { y_min, y_avg, y_max , db_ } );
+        if( graph_list.size() >  (unsigned)r.width() )
+        {
+            graph_list.erase( graph_list.begin() );
+        }
+        set_dirty();
+    }
 } /* namespace ui */

firmware/application/ui/ui_rssi.hpp

@@ -49,13 +49,21 @@ public:
     int32_t get_min();
     int32_t get_avg();
     int32_t get_max();
+	void set_vertical_rssi(bool enabled);
+	void set_peak(bool enabled, size_t duration);
 	
 private:
 	int32_t min_;
 	int32_t avg_;
 	int32_t max_;
+	int32_t peak_ = 0 ;
+    size_t peak_duration_ = 0 ;
 	
 	bool pitch_rssi_enabled = false;
+    bool vertical_rssi_enabled = false; // scale [vertically/from bottom to top]
+                                        // instead of [horizontally/from left to right]
+    bool peak_enabled = false;
+    size_t peak_duration = 1000;        // peak duration in msec before being reset to actual max_rssi 
 
 	MessageHandlerRegistration message_handler_stats {
 		Message::ID::RSSIStatistics,
@@ -76,6 +84,29 @@ private:
 	void set_pitch_rssi(bool enabled);
 };
 
+struct RSSIGraph_entry {
+	int32_t rssi_min { 0 };
+	int32_t rssi_avg { 0 };
+	int32_t rssi_max { 0 };
+	int32_t db { 0 };
+};
+
+using RSSIGraphList = std::vector<RSSIGraph_entry>;
+
+class RSSIGraph : public Widget {
+public:
+	RSSIGraph(
+		const Rect parent_rect
+	) : Widget { parent_rect }
+	{
+	}
+	void paint(Painter& painter) override;
+	void add_values(int32_t rssi_min, int32_t rssi_avg, int32_t rssi_max, int32_t db );
+	
+private:
+	RSSIGraphList graph_list { } ;
+};
+
 }
 
 #endif/*__UI_RSSI_H__*/

firmware/application/ui_navigation.cpp

@@ -58,6 +58,7 @@
 #include "ui_scanner.hpp"
 #include "ui_search.hpp"
 #include "ui_recon.hpp"
+#include "ui_level.hpp"
 #include "ui_sd_wipe.hpp"
 #include "ui_settings.hpp"
 #include "ui_siggen.hpp"
@@ -484,6 +485,7 @@ ReceiversMenuView::ReceiversMenuView(NavigationView& nav) {
 		{ "Radiosnde", 	ui::Color::green(),		&bitmap_icon_sonde,		[&nav](){ nav.push<SondeView>(); } },
 		{ "TPMS Cars", 	ui::Color::green(),		&bitmap_icon_tpms,		[&nav](){ nav.push<TPMSAppView>(); } },
        	{ "Recon", 	    ui::Color::green(),		&bitmap_icon_scanner,	[&nav](){ nav.push<ReconView>(); } },
+       	{ "Level", 	    ui::Color::green(),		&bitmap_icon_options_radio,	[&nav](){ nav.push<LevelView>(); } },
 		{ "APRS", 		ui::Color::green(),		&bitmap_icon_aprs,		[&nav](){ nav.push<APRSRXView>(); } }
 		/*
 		{ "DMR", 		ui::Color::dark_grey(),	&bitmap_icon_dmr,		[&nav](){ nav.push<NotImplementedView>(); } },

hackrf

@@ -1 +1 @@
-Subproject commit b42a185503b306f390dc620b57cdc797217407de
+Subproject commit ae71cb5b7ae29eb9bddf359896a66aaa88b9dfac