[FL-2797] Signal Generator app (#1793)

* Signal Generator app
* MCO pin initialization in app
* furi_hal_pwm documentation

Co-authored-by: あく <alleteam@gmail.com>

applications/plugins/signal_generator/application.fam

@@ -0,0 +1,12 @@
+App(
+    appid="signal_generator",
+    name="Signal Generator",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="signal_gen_app",
+    cdefines=["APP_SIGNAL_GEN"],
+    requires=["gui"],
+    stack_size=1 * 1024,
+    order=50,
+    fap_icon="signal_gen_10px.png",
+    fap_category="Tools",
+)

applications/plugins/signal_generator/scenes/signal_gen_scene.c

@@ -0,0 +1,30 @@
+#include "../signal_gen_app_i.h"
+
+// Generate scene on_enter handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_enter,
+void (*const signal_gen_scene_on_enter_handlers[])(void*) = {
+#include "signal_gen_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Generate scene on_event handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_event,
+bool (*const signal_gen_scene_on_event_handlers[])(void* context, SceneManagerEvent event) = {
+#include "signal_gen_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Generate scene on_exit handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_exit,
+void (*const signal_gen_scene_on_exit_handlers[])(void* context) = {
+#include "signal_gen_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Initialize scene handlers configuration structure
+const SceneManagerHandlers signal_gen_scene_handlers = {
+    .on_enter_handlers = signal_gen_scene_on_enter_handlers,
+    .on_event_handlers = signal_gen_scene_on_event_handlers,
+    .on_exit_handlers = signal_gen_scene_on_exit_handlers,
+    .scene_num = SignalGenSceneNum,
+};

applications/plugins/signal_generator/scenes/signal_gen_scene.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <gui/scene_manager.h>
+
+// Generate scene id and total number
+#define ADD_SCENE(prefix, name, id) SignalGenScene##id,
+typedef enum {
+#include "signal_gen_scene_config.h"
+    SignalGenSceneNum,
+} SignalGenScene;
+#undef ADD_SCENE
+
+extern const SceneManagerHandlers signal_gen_scene_handlers;
+
+// Generate scene on_enter handlers declaration
+#define ADD_SCENE(prefix, name, id) void prefix##_scene_##name##_on_enter(void*);
+#include "signal_gen_scene_config.h"
+#undef ADD_SCENE
+
+// Generate scene on_event handlers declaration
+#define ADD_SCENE(prefix, name, id) \
+    bool prefix##_scene_##name##_on_event(void* context, SceneManagerEvent event);
+#include "signal_gen_scene_config.h"
+#undef ADD_SCENE
+
+// Generate scene on_exit handlers declaration
+#define ADD_SCENE(prefix, name, id) void prefix##_scene_##name##_on_exit(void* context);
+#include "signal_gen_scene_config.h"
+#undef ADD_SCENE

applications/plugins/signal_generator/scenes/signal_gen_scene_config.h

@@ -0,0 +1,3 @@
+ADD_SCENE(signal_gen, start, Start)
+ADD_SCENE(signal_gen, pwm, Pwm)
+ADD_SCENE(signal_gen, mco, Mco)

applications/plugins/signal_generator/scenes/signal_gen_scene_mco.c

@@ -0,0 +1,132 @@
+#include "../signal_gen_app_i.h"
+
+typedef enum {
+    LineIndexSource,
+    LineIndexDivision,
+} LineIndex;
+
+static const char* const mco_source_names[] = {
+    "32768",
+    "64MHz",
+    "~100K",
+    "~200K",
+    "~400K",
+    "~800K",
+    "~1MHz",
+    "~2MHz",
+    "~4MHz",
+    "~8MHz",
+    "~16MHz",
+    "~24MHz",
+    "~32MHz",
+    "~48MHz",
+};
+
+static const FuriHalClockMcoSourceId mco_sources[] = {
+    FuriHalClockMcoLse,
+    FuriHalClockMcoSysclk,
+    FuriHalClockMcoMsi100k,
+    FuriHalClockMcoMsi200k,
+    FuriHalClockMcoMsi400k,
+    FuriHalClockMcoMsi800k,
+    FuriHalClockMcoMsi1m,
+    FuriHalClockMcoMsi2m,
+    FuriHalClockMcoMsi4m,
+    FuriHalClockMcoMsi8m,
+    FuriHalClockMcoMsi16m,
+    FuriHalClockMcoMsi24m,
+    FuriHalClockMcoMsi32m,
+    FuriHalClockMcoMsi48m,
+};
+
+static const char* const mco_divisor_names[] = {
+    "1",
+    "2",
+    "4",
+    "8",
+    "16",
+};
+
+static const FuriHalClockMcoDivisorId mco_divisors[] = {
+    FuriHalClockMcoDiv1,
+    FuriHalClockMcoDiv2,
+    FuriHalClockMcoDiv4,
+    FuriHalClockMcoDiv8,
+    FuriHalClockMcoDiv16,
+};
+
+static void mco_source_list_change_callback(VariableItem* item) {
+    SignalGenApp* app = variable_item_get_context(item);
+    uint8_t index = variable_item_get_current_value_index(item);
+    variable_item_set_current_value_text(item, mco_source_names[index]);
+
+    app->mco_src = mco_sources[index];
+
+    view_dispatcher_send_custom_event(app->view_dispatcher, SignalGenMcoEventUpdate);
+}
+
+static void mco_divisor_list_change_callback(VariableItem* item) {
+    SignalGenApp* app = variable_item_get_context(item);
+    uint8_t index = variable_item_get_current_value_index(item);
+    variable_item_set_current_value_text(item, mco_divisor_names[index]);
+
+    app->mco_div = mco_divisors[index];
+
+    view_dispatcher_send_custom_event(app->view_dispatcher, SignalGenMcoEventUpdate);
+}
+
+void signal_gen_scene_mco_on_enter(void* context) {
+    SignalGenApp* app = context;
+    VariableItemList* var_item_list = app->var_item_list;
+
+    VariableItem* item;
+
+    item = variable_item_list_add(
+        var_item_list, "Source", COUNT_OF(mco_source_names), mco_source_list_change_callback, app);
+    variable_item_set_current_value_index(item, 0);
+    variable_item_set_current_value_text(item, mco_source_names[0]);
+
+    item = variable_item_list_add(
+        var_item_list,
+        "Division",
+        COUNT_OF(mco_divisor_names),
+        mco_divisor_list_change_callback,
+        app);
+    variable_item_set_current_value_index(item, 0);
+    variable_item_set_current_value_text(item, mco_divisor_names[0]);
+
+    variable_item_list_set_selected_item(var_item_list, LineIndexSource);
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, SignalGenViewVarItemList);
+
+    app->mco_src = FuriHalClockMcoLse;
+    app->mco_div = FuriHalClockMcoDiv1;
+    furi_hal_clock_mco_enable(app->mco_src, app->mco_div);
+    furi_hal_gpio_init_ex(
+        &gpio_usart_tx, GpioModeAltFunctionPushPull, GpioPullUp, GpioSpeedVeryHigh, GpioAltFn0MCO);
+}
+
+bool signal_gen_scene_mco_on_event(void* context, SceneManagerEvent event) {
+    SignalGenApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == SignalGenMcoEventUpdate) {
+            consumed = true;
+            furi_hal_clock_mco_enable(app->mco_src, app->mco_div);
+        }
+    }
+    return consumed;
+}
+
+void signal_gen_scene_mco_on_exit(void* context) {
+    SignalGenApp* app = context;
+    variable_item_list_reset(app->var_item_list);
+    furi_hal_gpio_init_ex(
+        &gpio_usart_tx,
+        GpioModeAltFunctionPushPull,
+        GpioPullUp,
+        GpioSpeedVeryHigh,
+        GpioAltFn7USART1);
+    furi_hal_clock_mco_disable();
+}

applications/plugins/signal_generator/scenes/signal_gen_scene_pwm.c

@@ -0,0 +1,60 @@
+#include "../signal_gen_app_i.h"
+
+static const FuriHalPwmOutputId pwm_ch_id[] = {
+    FuriHalPwmOutputIdTim1PA7,
+    FuriHalPwmOutputIdLptim2PA4,
+};
+
+#define DEFAULT_FREQ 1000
+#define DEFAULT_DUTY 50
+
+static void
+    signal_gen_pwm_callback(uint8_t channel_id, uint32_t freq, uint8_t duty, void* context) {
+    SignalGenApp* app = context;
+
+    app->pwm_freq = freq;
+    app->pwm_duty = duty;
+
+    if(app->pwm_ch != pwm_ch_id[channel_id]) {
+        app->pwm_ch_prev = app->pwm_ch;
+        app->pwm_ch = pwm_ch_id[channel_id];
+        view_dispatcher_send_custom_event(app->view_dispatcher, SignalGenPwmEventChannelChange);
+    } else {
+        app->pwm_ch = pwm_ch_id[channel_id];
+        view_dispatcher_send_custom_event(app->view_dispatcher, SignalGenPwmEventUpdate);
+    }
+}
+
+void signal_gen_scene_pwm_on_enter(void* context) {
+    SignalGenApp* app = context;
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, SignalGenViewPwm);
+
+    signal_gen_pwm_set_callback(app->pwm_view, signal_gen_pwm_callback, app);
+
+    signal_gen_pwm_set_params(app->pwm_view, 0, DEFAULT_FREQ, DEFAULT_DUTY);
+    furi_hal_pwm_start(pwm_ch_id[0], DEFAULT_FREQ, DEFAULT_DUTY);
+}
+
+bool signal_gen_scene_pwm_on_event(void* context, SceneManagerEvent event) {
+    SignalGenApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == SignalGenPwmEventUpdate) {
+            consumed = true;
+            furi_hal_pwm_set_params(app->pwm_ch, app->pwm_freq, app->pwm_duty);
+        } else if(event.event == SignalGenPwmEventChannelChange) {
+            consumed = true;
+            furi_hal_pwm_stop(app->pwm_ch_prev);
+            furi_hal_pwm_start(app->pwm_ch, app->pwm_freq, app->pwm_duty);
+        }
+    }
+    return consumed;
+}
+
+void signal_gen_scene_pwm_on_exit(void* context) {
+    SignalGenApp* app = context;
+    variable_item_list_reset(app->var_item_list);
+    furi_hal_pwm_stop(app->pwm_ch);
+}

applications/plugins/signal_generator/scenes/signal_gen_scene_start.c

@@ -0,0 +1,55 @@
+#include "../signal_gen_app_i.h"
+
+typedef enum {
+    SubmenuIndexPwm,
+    SubmenuIndexClockOutput,
+} SubmenuIndex;
+
+void signal_gen_scene_start_submenu_callback(void* context, uint32_t index) {
+    SignalGenApp* app = context;
+
+    view_dispatcher_send_custom_event(app->view_dispatcher, index);
+}
+
+void signal_gen_scene_start_on_enter(void* context) {
+    SignalGenApp* app = context;
+    Submenu* submenu = app->submenu;
+
+    submenu_add_item(
+        submenu, "PWM", SubmenuIndexPwm, signal_gen_scene_start_submenu_callback, app);
+    submenu_add_item(
+        submenu,
+        "Clock Output",
+        SubmenuIndexClockOutput,
+        signal_gen_scene_start_submenu_callback,
+        app);
+
+    submenu_set_selected_item(
+        submenu, scene_manager_get_scene_state(app->scene_manager, SignalGenSceneStart));
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, SignalGenViewSubmenu);
+}
+
+bool signal_gen_scene_start_on_event(void* context, SceneManagerEvent event) {
+    SignalGenApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == SubmenuIndexPwm) {
+            scene_manager_next_scene(app->scene_manager, SignalGenScenePwm);
+            consumed = true;
+        } else if(event.event == SubmenuIndexClockOutput) {
+            scene_manager_next_scene(app->scene_manager, SignalGenSceneMco);
+            consumed = true;
+        }
+        scene_manager_set_scene_state(app->scene_manager, SignalGenSceneStart, event.event);
+    }
+
+    return consumed;
+}
+
+void signal_gen_scene_start_on_exit(void* context) {
+    SignalGenApp* app = context;
+
+    submenu_reset(app->submenu);
+}

applications/plugins/signal_generator/signal_gen_app.c

@@ -0,0 +1,93 @@
+#include "signal_gen_app_i.h"
+
+#include <furi.h>
+#include <furi_hal.h>
+
+static bool signal_gen_app_custom_event_callback(void* context, uint32_t event) {
+    furi_assert(context);
+    SignalGenApp* app = context;
+    return scene_manager_handle_custom_event(app->scene_manager, event);
+}
+
+static bool signal_gen_app_back_event_callback(void* context) {
+    furi_assert(context);
+    SignalGenApp* app = context;
+    return scene_manager_handle_back_event(app->scene_manager);
+}
+
+static void signal_gen_app_tick_event_callback(void* context) {
+    furi_assert(context);
+    SignalGenApp* app = context;
+    scene_manager_handle_tick_event(app->scene_manager);
+}
+
+SignalGenApp* signal_gen_app_alloc() {
+    SignalGenApp* app = malloc(sizeof(SignalGenApp));
+
+    app->gui = furi_record_open(RECORD_GUI);
+
+    app->view_dispatcher = view_dispatcher_alloc();
+    app->scene_manager = scene_manager_alloc(&signal_gen_scene_handlers, app);
+    view_dispatcher_enable_queue(app->view_dispatcher);
+    view_dispatcher_set_event_callback_context(app->view_dispatcher, app);
+
+    view_dispatcher_set_custom_event_callback(
+        app->view_dispatcher, signal_gen_app_custom_event_callback);
+    view_dispatcher_set_navigation_event_callback(
+        app->view_dispatcher, signal_gen_app_back_event_callback);
+    view_dispatcher_set_tick_event_callback(
+        app->view_dispatcher, signal_gen_app_tick_event_callback, 100);
+
+    view_dispatcher_attach_to_gui(app->view_dispatcher, app->gui, ViewDispatcherTypeFullscreen);
+
+    app->var_item_list = variable_item_list_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        SignalGenViewVarItemList,
+        variable_item_list_get_view(app->var_item_list));
+
+    app->submenu = submenu_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, SignalGenViewSubmenu, submenu_get_view(app->submenu));
+
+    app->pwm_view = signal_gen_pwm_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, SignalGenViewPwm, signal_gen_pwm_get_view(app->pwm_view));
+
+    scene_manager_next_scene(app->scene_manager, SignalGenSceneStart);
+
+    return app;
+}
+
+void signal_gen_app_free(SignalGenApp* app) {
+    furi_assert(app);
+
+    // Views
+    view_dispatcher_remove_view(app->view_dispatcher, SignalGenViewVarItemList);
+    view_dispatcher_remove_view(app->view_dispatcher, SignalGenViewSubmenu);
+    view_dispatcher_remove_view(app->view_dispatcher, SignalGenViewPwm);
+
+    submenu_free(app->submenu);
+    variable_item_list_free(app->var_item_list);
+    signal_gen_pwm_free(app->pwm_view);
+
+    // View dispatcher
+    view_dispatcher_free(app->view_dispatcher);
+    scene_manager_free(app->scene_manager);
+
+    // Close records
+    furi_record_close(RECORD_GUI);
+
+    free(app);
+}
+
+int32_t signal_gen_app(void* p) {
+    UNUSED(p);
+    SignalGenApp* signal_gen_app = signal_gen_app_alloc();
+
+    view_dispatcher_run(signal_gen_app->view_dispatcher);
+
+    signal_gen_app_free(signal_gen_app);
+
+    return 0;
+}

applications/plugins/signal_generator/signal_gen_app_i.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "scenes/signal_gen_scene.h"
+
+#include "furi_hal_clock.h"
+#include "furi_hal_pwm.h"
+
+#include <gui/gui.h>
+#include <gui/view_dispatcher.h>
+#include <gui/scene_manager.h>
+#include <gui/modules/submenu.h>
+#include <gui/modules/variable_item_list.h>
+#include <gui/modules/submenu.h>
+#include "views/signal_gen_pwm.h"
+
+typedef struct SignalGenApp SignalGenApp;
+
+struct SignalGenApp {
+    Gui* gui;
+    ViewDispatcher* view_dispatcher;
+    SceneManager* scene_manager;
+
+    VariableItemList* var_item_list;
+    Submenu* submenu;
+    SignalGenPwm* pwm_view;
+
+    FuriHalClockMcoSourceId mco_src;
+    FuriHalClockMcoDivisorId mco_div;
+
+    FuriHalPwmOutputId pwm_ch_prev;
+    FuriHalPwmOutputId pwm_ch;
+    uint32_t pwm_freq;
+    uint8_t pwm_duty;
+};
+
+typedef enum {
+    SignalGenViewVarItemList,
+    SignalGenViewSubmenu,
+    SignalGenViewPwm,
+} SignalGenAppView;
+
+typedef enum {
+    SignalGenMcoEventUpdate,
+    SignalGenPwmEventUpdate,
+    SignalGenPwmEventChannelChange,
+} SignalGenCustomEvent;

applications/plugins/signal_generator/views/signal_gen_pwm.c

@@ -0,0 +1,301 @@
+#include "../signal_gen_app_i.h"
+#include "furi_hal.h"
+#include <gui/elements.h>
+
+typedef enum {
+    LineIndexChannel,
+    LineIndexFrequency,
+    LineIndexDuty,
+    LineIndexTotalCount
+} LineIndex;
+
+static const char* const pwm_ch_names[] = {"TIM1(2)", "LPTIM2(4)"};
+
+struct SignalGenPwm {
+    View* view;
+    SignalGenPwmViewCallback callback;
+    void* context;
+};
+
+typedef struct {
+    LineIndex line_sel;
+    bool edit_mode;
+    uint8_t edit_digit;
+
+    uint8_t channel_id;
+    uint32_t freq;
+    uint8_t duty;
+
+} SignalGenPwmViewModel;
+
+#define ITEM_H 64 / 3
+#define ITEM_W 128
+
+#define VALUE_X 95
+#define VALUE_W 55
+
+#define FREQ_VALUE_X 62
+#define FREQ_MAX 1000000UL
+#define FREQ_DIGITS_NB 7
+
+static void pwm_set_config(SignalGenPwm* pwm) {
+    FuriHalPwmOutputId channel;
+    uint32_t freq;
+    uint8_t duty;
+
+    with_view_model(
+        pwm->view, (SignalGenPwmViewModel * model) {
+            channel = model->channel_id;
+            freq = model->freq;
+            duty = model->duty;
+            return false;
+        });
+
+    furi_assert(pwm->callback);
+    pwm->callback(channel, freq, duty, pwm->context);
+}
+
+static void pwm_channel_change(SignalGenPwmViewModel* model, InputEvent* event) {
+    if(event->key == InputKeyLeft) {
+        if(model->channel_id > 0) {
+            model->channel_id--;
+        }
+    } else if(event->key == InputKeyRight) {
+        if(model->channel_id < (COUNT_OF(pwm_ch_names) - 1)) {
+            model->channel_id++;
+        }
+    }
+}
+
+static void pwm_duty_change(SignalGenPwmViewModel* model, InputEvent* event) {
+    if(event->key == InputKeyLeft) {
+        if(model->duty > 0) {
+            model->duty--;
+        }
+    } else if(event->key == InputKeyRight) {
+        if(model->duty < 100) {
+            model->duty++;
+        }
+    }
+}
+
+static bool pwm_freq_edit(SignalGenPwmViewModel* model, InputEvent* event) {
+    bool consumed = false;
+    if((event->type == InputTypeShort) || (event->type == InputTypeRepeat)) {
+        if(event->key == InputKeyRight) {
+            if(model->edit_digit > 0) {
+                model->edit_digit--;
+            }
+            consumed = true;
+        } else if(event->key == InputKeyLeft) {
+            if(model->edit_digit < (FREQ_DIGITS_NB - 1)) {
+                model->edit_digit++;
+            }
+            consumed = true;
+        } else if(event->key == InputKeyUp) {
+            uint32_t step = 1;
+            for(uint8_t i = 0; i < model->edit_digit; i++) {
+                step *= 10;
+            }
+            if((model->freq + step) < FREQ_MAX) {
+                model->freq += step;
+            } else {
+                model->freq = FREQ_MAX;
+            }
+            consumed = true;
+        } else if(event->key == InputKeyDown) {
+            uint32_t step = 1;
+            for(uint8_t i = 0; i < model->edit_digit; i++) {
+                step *= 10;
+            }
+            if(model->freq > (step + 1)) {
+                model->freq -= step;
+            } else {
+                model->freq = 1;
+            }
+            consumed = true;
+        }
+    }
+    return consumed;
+}
+
+static void signal_gen_pwm_draw_callback(Canvas* canvas, void* _model) {
+    SignalGenPwmViewModel* model = _model;
+    char* line_label = NULL;
+    char val_text[16];
+
+    for(uint8_t line = 0; line < LineIndexTotalCount; line++) {
+        if(line == LineIndexChannel) {
+            line_label = "PWM Channel";
+        } else if(line == LineIndexFrequency) {
+            line_label = "Frequency";
+        } else if(line == LineIndexDuty) {
+            line_label = "Duty Cycle";
+        }
+
+        canvas_set_color(canvas, ColorBlack);
+        if(line == model->line_sel) {
+            elements_slightly_rounded_box(canvas, 0, ITEM_H * line + 1, ITEM_W, ITEM_H - 1);
+            canvas_set_color(canvas, ColorWhite);
+        }
+
+        uint8_t text_y = ITEM_H * line + ITEM_H / 2 + 2;
+
+        canvas_draw_str_aligned(canvas, 6, text_y, AlignLeft, AlignCenter, line_label);
+
+        if(line == LineIndexChannel) {
+            snprintf(val_text, sizeof(val_text), "%s", pwm_ch_names[model->channel_id]);
+            canvas_draw_str_aligned(canvas, VALUE_X, text_y, AlignCenter, AlignCenter, val_text);
+            if(model->channel_id != 0) {
+                canvas_draw_str_aligned(
+                    canvas, VALUE_X - VALUE_W / 2, text_y, AlignCenter, AlignCenter, "<");
+            }
+            if(model->channel_id != (COUNT_OF(pwm_ch_names) - 1)) {
+                canvas_draw_str_aligned(
+                    canvas, VALUE_X + VALUE_W / 2, text_y, AlignCenter, AlignCenter, ">");
+            }
+        } else if(line == LineIndexFrequency) {
+            snprintf(val_text, sizeof(val_text), "%7lu Hz", model->freq);
+            canvas_set_font(canvas, FontKeyboard);
+            canvas_draw_str_aligned(
+                canvas, FREQ_VALUE_X, text_y, AlignLeft, AlignCenter, val_text);
+            canvas_set_font(canvas, FontSecondary);
+
+            if(model->edit_mode) {
+                uint8_t icon_x = (FREQ_VALUE_X - 1) + (FREQ_DIGITS_NB - model->edit_digit - 1) * 6;
+                canvas_draw_icon(canvas, icon_x, text_y - 9, &I_SmallArrowUp_4x7);
+                canvas_draw_icon(canvas, icon_x, text_y + 4, &I_SmallArrowDown_4x7);
+            }
+        } else if(line == LineIndexDuty) {
+            snprintf(val_text, sizeof(val_text), "%d%%", model->duty);
+            canvas_draw_str_aligned(canvas, VALUE_X, text_y, AlignCenter, AlignCenter, val_text);
+            if(model->duty != 0) {
+                canvas_draw_str_aligned(
+                    canvas, VALUE_X - VALUE_W / 2, text_y, AlignCenter, AlignCenter, "<");
+            }
+            if(model->duty != 100) {
+                canvas_draw_str_aligned(
+                    canvas, VALUE_X + VALUE_W / 2, text_y, AlignCenter, AlignCenter, ">");
+            }
+        }
+    }
+}
+
+static bool signal_gen_pwm_input_callback(InputEvent* event, void* context) {
+    furi_assert(context);
+    SignalGenPwm* pwm = context;
+    bool consumed = false;
+    bool need_update = false;
+
+    with_view_model(
+        pwm->view, (SignalGenPwmViewModel * model) {
+            if(model->edit_mode == false) {
+                if((event->type == InputTypeShort) || (event->type == InputTypeRepeat)) {
+                    if(event->key == InputKeyUp) {
+                        if(model->line_sel == 0) {
+                            model->line_sel = LineIndexTotalCount - 1;
+                        } else {
+                            model->line_sel =
+                                CLAMP(model->line_sel - 1, LineIndexTotalCount - 1, 0);
+                        }
+                        consumed = true;
+                    } else if(event->key == InputKeyDown) {
+                        if(model->line_sel == LineIndexTotalCount - 1) {
+                            model->line_sel = 0;
+                        } else {
+                            model->line_sel =
+                                CLAMP(model->line_sel + 1, LineIndexTotalCount - 1, 0);
+                        }
+                        consumed = true;
+                    } else if((event->key == InputKeyLeft) || (event->key == InputKeyRight)) {
+                        if(model->line_sel == LineIndexChannel) {
+                            pwm_channel_change(model, event);
+                            need_update = true;
+                        } else if(model->line_sel == LineIndexDuty) {
+                            pwm_duty_change(model, event);
+                            need_update = true;
+                        } else if(model->line_sel == LineIndexFrequency) {
+                            model->edit_mode = true;
+                        }
+                        consumed = true;
+                    } else if(event->key == InputKeyOk) {
+                        if(model->line_sel == LineIndexFrequency) {
+                            model->edit_mode = true;
+                        }
+                        consumed = true;
+                    }
+                }
+            } else {
+                if((event->key == InputKeyOk) || (event->key == InputKeyBack)) {
+                    if(event->type == InputTypeShort) {
+                        model->edit_mode = false;
+                        consumed = true;
+                    }
+                } else {
+                    if(model->line_sel == LineIndexFrequency) {
+                        consumed = pwm_freq_edit(model, event);
+                        need_update = consumed;
+                    }
+                }
+            }
+            return true;
+        });
+
+    if(need_update) {
+        pwm_set_config(pwm);
+    }
+
+    return consumed;
+}
+
+SignalGenPwm* signal_gen_pwm_alloc() {
+    SignalGenPwm* pwm = malloc(sizeof(SignalGenPwm));
+
+    pwm->view = view_alloc();
+    view_allocate_model(pwm->view, ViewModelTypeLocking, sizeof(SignalGenPwmViewModel));
+    view_set_context(pwm->view, pwm);
+    view_set_draw_callback(pwm->view, signal_gen_pwm_draw_callback);
+    view_set_input_callback(pwm->view, signal_gen_pwm_input_callback);
+
+    return pwm;
+}
+
+void signal_gen_pwm_free(SignalGenPwm* pwm) {
+    furi_assert(pwm);
+    view_free(pwm->view);
+    free(pwm);
+}
+
+View* signal_gen_pwm_get_view(SignalGenPwm* pwm) {
+    furi_assert(pwm);
+    return pwm->view;
+}
+
+void signal_gen_pwm_set_callback(
+    SignalGenPwm* pwm,
+    SignalGenPwmViewCallback callback,
+    void* context) {
+    furi_assert(pwm);
+    furi_assert(callback);
+
+    with_view_model(
+        pwm->view, (SignalGenPwmViewModel * model) {
+            UNUSED(model);
+            pwm->callback = callback;
+            pwm->context = context;
+            return false;
+        });
+}
+
+void signal_gen_pwm_set_params(SignalGenPwm* pwm, uint8_t channel_id, uint32_t freq, uint8_t duty) {
+    with_view_model(
+        pwm->view, (SignalGenPwmViewModel * model) {
+            model->channel_id = channel_id;
+            model->freq = freq;
+            model->duty = duty;
+            return true;
+        });
+
+    furi_assert(pwm->callback);
+    pwm->callback(channel_id, freq, duty, pwm->context);
+}

applications/plugins/signal_generator/views/signal_gen_pwm.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <gui/view.h>
+#include "../signal_gen_app_i.h"
+
+typedef struct SignalGenPwm SignalGenPwm;
+typedef void (
+    *SignalGenPwmViewCallback)(uint8_t channel_id, uint32_t freq, uint8_t duty, void* context);
+
+SignalGenPwm* signal_gen_pwm_alloc();
+
+void signal_gen_pwm_free(SignalGenPwm* pwm);
+
+View* signal_gen_pwm_get_view(SignalGenPwm* pwm);
+
+void signal_gen_pwm_set_callback(
+    SignalGenPwm* pwm,
+    SignalGenPwmViewCallback callback,
+    void* context);
+
+void signal_gen_pwm_set_params(SignalGenPwm* pwm, uint8_t channel_id, uint32_t freq, uint8_t duty);