Momentum-Apps/intervalometer.c

// An intervalometer application written for the Flipper Zero
//
// author: nitepone <sierra>

#include "intervalometer.h"
#include <stdlib.h>
#include <stdio.h>
#include <furi.h>
#include <furi_hal.h>
#include <core/string.h>
#include <gui/gui.h>
#include <gui/elements.h>
#include <gui/icon.h>
#include <infrared_transmit.h>

#include <input/input.h>

#include <notification/notification.h>
#include <notification/notification_messages.h>

#include <ir_intervalometer_icons.h>

// app ui scenes
enum flipvalo_ui_scene {
    FVSceneMain,
    FVSceneConfig,
};

// defines a flipvalo camera trigger
struct flipvalo_trigger {
    const char* display_name;
    int (*send)(void* output_config);
};

enum flipvalo_trigger_variants {
    FvTrigMin = 0,
    FvTrigSony = 0,
    FvTrigCanon = 1,
    FvTrigNikon = 2,
    FvTrigPentax = 3,
    FvTrigMax = 3,
};

// run config for intervalometer
struct flipvalo_config {
    int init_delay_msec;          // initial delay to start capture
    int interval_delay_msec;      // time between shots
    int shot_count;               // total shots in run
    int burst_count;              // number of triggers in a shot
    int burst_delay_msec;         // time between triggers in a shot
    int tickrate;                 // tick rate in "ticks per second"
    enum flipvalo_trigger_variants trigger; // current trigger

    void* output_config;
};

// run time states for intervalometer
enum flipvalo_state {
    FVDone = 0,                   // done, 0 so it is default if state struct is zeroed
    FVWaitInitShot,               // waiting for first shot
    FVWaitContShot,               // waiting between "bursts" or "shots"
    FVWaitBurst,                  // waiting between shots in a "burst"
};

// run time data for intervalometer
// (this can be safely cleared between runs of the intervalometer)
struct flipvalo_run_state {
    enum flipvalo_state state;  // current state of the run
    int tick_cur;               // current tick count
    int tick_next;              // tick when next action will occur
    int shot_cur;               // current shot
    int burst_cur;              // current trigger in a burst
};

enum flipvalo_config_edit_lines {
    FvConfigEditInitDelay,
    FvConfigEditMIN = FvConfigEditInitDelay,
    FvConfigEditShotCount,
    FvConfigEditShotDelay,
    FvConfigEditBurstCount,
    FvConfigEditBurstDelay,
    FvConfigEditTrigger,
    FvConfigEditMAX = FvConfigEditTrigger,
};

struct flipvalo_config_edit_view {
    // the `config` that is under edit
    struct flipvalo_config* config;
    // the `cur_index` of the selection
    // (e.g. editing the 3rd value of a number)
    int cur_index;
    // the `cur_line` of the selection
    enum flipvalo_config_edit_lines cur_line;
    // the current line that is at the top of the scrolled view
    enum flipvalo_config_edit_lines scroll_pos;
    // are we editing the selection?
    // (this is really only needed for number fields)
    bool edit_mode;
};

// private data of app
struct flipvalo_priv {
    struct flipvalo_config config;
    struct flipvalo_config_edit_view config_edit_view;
    struct flipvalo_run_state run_state;
    enum flipvalo_ui_scene ui_scene;
    int gui_shutter_blink;
    FuriTimer* timer;
    NotificationApp* notifications;
    FuriMutex* mutex;
};

enum event_type {
    EventTypeTick,
    EventTypeKey,
};

struct plugin_event {
    enum event_type type;
    InputEvent input;
};


enum flipvalo_config_edit_line_type {
    FvConfigEditTypeTimer,
    FvConfigEditTypeCount,
    FvConfigEditTypeEnum,
};

static void flipvalo_config_edit_view_init(struct flipvalo_config_edit_view* view) {
    view->config = NULL;
    view->cur_index = 0;
    view->cur_line = 0;
    view->scroll_pos = 0;
    view->edit_mode = false;
}

static int sony_ir_trigger_send(void* ctx) {
    UNUSED(ctx);
    InfraredMessage message = {
        .address = 0x1E3A,
        .command = 0x2D,
        .protocol = InfraredProtocolSIRC20,
    };
    infrared_send(&message, 1);
    return 0;
}

uint32_t canon_ir_timings[] = {
    594, 7182, 593
};
static int canon_ir_trigger_send(void* ctx) {
    UNUSED(ctx);
    infrared_send_raw_ext(canon_ir_timings, 3, true, 38000, 0.33);
    return 0;
}

uint32_t nikon_ir_timings[] = {
    1945, 28253, 404, 1513, 410, 3611, 460, 70144, 1974,
    28213, 455, 1493, 461, 3591, 409
};
static int nikon_ir_trigger_send(void* ctx) {
    UNUSED(ctx);
    infrared_send_raw_ext(nikon_ir_timings, 15, true, 38000, 0.33);
    return 0;
}

uint32_t pentax_ir_timings[] = {
    13044, 3057, 965, 1023, 967, 1022, 968, 1023, 
    990, 1053, 966, 1023, 967, 1024, 989
};
static int pentax_ir_trigger_send(void* ctx) {
    UNUSED(ctx);
    infrared_send_raw_ext(pentax_ir_timings, 15, true, 38000, 0.33);
    return 0;
}

struct flipvalo_trigger sony_ir_trigger = {
    .send = sony_ir_trigger_send,
    .display_name = "Sony IR"
};

struct flipvalo_trigger canon_ir_trigger = {
    .send = canon_ir_trigger_send,
    .display_name = "Canon IR"
};

struct flipvalo_trigger nikon_ir_trigger = {
    .send = nikon_ir_trigger_send,
    .display_name = "Nikon IR"
};

struct flipvalo_trigger pentax_ir_trigger = {
    .send = pentax_ir_trigger_send,
    .display_name = "Pentax IR"
};

static struct flipvalo_trigger* flipvalo_get_trigger(
        enum flipvalo_trigger_variants variant
) {
    switch (variant) {
        case FvTrigSony:
            return &sony_ir_trigger;
        case FvTrigCanon:
            return &canon_ir_trigger;
        case FvTrigNikon:
            return &nikon_ir_trigger;
        case FvTrigPentax:
            return &pentax_ir_trigger; 
    }
    return NULL;
}

#define ITEM_H 64 / 3
#define ITEM_W 128
#define VALUE_X 100
#define VALUE_W 45
static void flipvalo_config_edit_draw(Canvas* canvas, struct flipvalo_config_edit_view* view) {
    int* line_value;
    char* line_label = NULL;
    const char* line_disp_str = "";
    FuriString* temp_str = furi_string_alloc();
    enum flipvalo_config_edit_line_type line_type;
    enum flipvalo_config_edit_lines selected_line;

    for (size_t line = 0; line < 3; line++) {
        selected_line = view->scroll_pos + line;
        switch (selected_line) {
            case FvConfigEditInitDelay:
                line_value = &view->config->init_delay_msec;
                line_type = FvConfigEditTypeTimer;
                line_label = "Init Time";
                break;
            case FvConfigEditShotDelay:
                line_value = &view->config->interval_delay_msec;
                line_type = FvConfigEditTypeTimer;
                line_label = "Seq Time";
                break;
            case FvConfigEditShotCount:
                line_value = &view->config->shot_count;
                line_type = FvConfigEditTypeCount;
                line_label = "Seq Count";
                break;
            case FvConfigEditBurstDelay:
                line_value = &view->config->burst_delay_msec;
                line_type = FvConfigEditTypeTimer;
                line_label = "Brst Time";
                break;
            case FvConfigEditBurstCount:
                line_value = &view->config->burst_count;
                line_type = FvConfigEditTypeCount;
                line_label = "Brst Count";
                break;
            case FvConfigEditTrigger:
                line_value = NULL;
                line_type = FvConfigEditTypeEnum;
                line_label = "Trig Type";
                line_disp_str = flipvalo_get_trigger(view->config->trigger)
                                                    ->display_name;
                break;
            default:
                continue;
        };

        canvas_set_color(canvas, ColorBlack);
        if ((selected_line) == view->cur_line) {
            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);

        switch(line_type) {
            case FvConfigEditTypeTimer:
                furi_string_printf(
                        temp_str, "%02d:%02d:%02d:%03d",
                        *line_value / 3600000,
                        (*line_value / 60000) % 60,
                        (*line_value / 1000) % 60,
                        *line_value % 1000);
                canvas_set_font(canvas, FontKeyboard);
                canvas_draw_str_aligned(
                        canvas, 124, text_y, AlignRight, AlignCenter,
                        furi_string_get_cstr(temp_str));
                canvas_set_font(canvas, FontSecondary);
                if (view->edit_mode && view->cur_line == selected_line) {
                    switch (view->cur_index) {
                        case 0:
                            canvas_draw_icon(canvas, 117, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 117, text_y + 5, &I_ArrowDown_3x5);
                            canvas_draw_icon(canvas, 112, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 112, text_y + 5, &I_ArrowDown_3x5);
                            canvas_draw_icon(canvas, 107, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 107, text_y + 5, &I_ArrowDown_3x5);
                            break;
                        case 1:
                            canvas_draw_icon(canvas, 93, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 93, text_y + 5, &I_ArrowDown_3x5);
                            canvas_draw_icon(canvas, 89, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 89, text_y + 5, &I_ArrowDown_3x5);
                            break;
                        case 2:
                            canvas_draw_icon(canvas, 75, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 75, text_y + 5, &I_ArrowDown_3x5);
                            canvas_draw_icon(canvas, 71, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 71, text_y + 5, &I_ArrowDown_3x5);
                            break;
                        case 3:
                            canvas_draw_icon(canvas, 57, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 57, text_y + 5, &I_ArrowDown_3x5);
                            canvas_draw_icon(canvas, 53, text_y - 9, &I_ArrowUp_3x5);
                            canvas_draw_icon(canvas, 53, text_y + 5, &I_ArrowDown_3x5);
                            break;
                    }
                }
                break;
            case FvConfigEditTypeCount:
                furi_string_printf(temp_str, "%d", *line_value);
                canvas_draw_str_aligned(
                        canvas, VALUE_X, text_y, AlignCenter, AlignCenter,
                        furi_string_get_cstr(temp_str));
                // TODO(luna) 0 values are actually more special for shot count and burst count.
                // former being infinite, latter being uh.. nothing? not allowed?.. review this logic later.
                if(*line_value > 0) {
                    canvas_draw_str_aligned(
                        canvas, VALUE_X - VALUE_W / 2, text_y, AlignCenter, AlignCenter, "<");
                }
                canvas_draw_str_aligned(
                    canvas, VALUE_X + VALUE_W / 2, text_y, AlignCenter, AlignCenter, ">");
                break;
            case FvConfigEditTypeEnum:
                furi_string_printf(temp_str, "%s", line_disp_str);
                canvas_draw_str_aligned(
                        canvas, VALUE_X, text_y, AlignCenter, AlignCenter,
                        furi_string_get_cstr(temp_str));
                canvas_draw_str_aligned(
                    canvas, VALUE_X - VALUE_W / 2, text_y, AlignCenter, AlignCenter, "<");
                canvas_draw_str_aligned(
                    canvas, VALUE_X + VALUE_W / 2, text_y, AlignCenter, AlignCenter, ">");
                break;
        }
    }

    furi_string_free(temp_str);
}

static void flipvalo_config_edit_input_move_cursor(struct flipvalo_config_edit_view* view, int dx, int dy) {
    enum flipvalo_config_edit_lines new_line = 0;

    int* line_value = NULL;
    enum flipvalo_config_edit_line_type line_type;
    // only used for enum type
    int max_value;
    int min_value;

    switch (view->cur_line) {
        case FvConfigEditInitDelay:
            line_value = &view->config->init_delay_msec;
            line_type = FvConfigEditTypeTimer;
            break;
        case FvConfigEditShotDelay:
            line_value = &view->config->interval_delay_msec;
            line_type = FvConfigEditTypeTimer;
            break;
        case FvConfigEditShotCount:
            line_value = &view->config->shot_count;
            line_type = FvConfigEditTypeCount;
            break;
        case FvConfigEditBurstDelay:
            line_value = &view->config->burst_delay_msec;
            line_type = FvConfigEditTypeTimer;
            break;
        case FvConfigEditBurstCount:
            line_value = &view->config->burst_count;
            line_type = FvConfigEditTypeCount;
            break;
        case FvConfigEditTrigger:
            line_value = (int*)(&view->config->trigger);
            line_type = FvConfigEditTypeEnum;
            min_value = FvTrigMin;
            max_value = FvTrigMax;
            break;
        default:
            return;
    };

    if (!view->edit_mode) {
        // Do `dy` behaviors
        new_line = view->cur_line + dy;
        if (new_line > FvConfigEditMAX) {
            // Out of bound cursor. No-op.
            return;
        }
        view->cur_line = new_line;

        // Handle moving scroll position.
        if (new_line < view->scroll_pos) {
            view->scroll_pos = new_line;
        }
        else if (new_line >= (view->scroll_pos + 3)) {
            view->scroll_pos+=dy;
        }

        // Do `dx` behavior
        switch (line_type) {
            case FvConfigEditTypeTimer:
                // no-op unless edit mode
                break;
            case FvConfigEditTypeCount:
                min_value = 0;
                max_value = INT_MAX;
                // fall through.
            case FvConfigEditTypeEnum:
                if ((*line_value + dx) >= min_value
                    && (*line_value + dx) <= max_value)
                {
                    *line_value += dx;
                }
                break;
        }
    }
    else /* edit mode */ {
        switch (line_type) {
            case FvConfigEditTypeCount:
            case FvConfigEditTypeEnum:
                // If current line does not edit mode.. why are we in edit mode?
                // Reaching this would be a bug, so lets go back to normal mode.
                view->edit_mode = false;
                return;
            case FvConfigEditTypeTimer:
                switch (view->cur_index) {
                    case 0:
                        if (*line_value + (dy * -10) >= 0) {
                            *line_value += (dy * -10);
                        }
                        break;
                    case 1:
                        if (*line_value + (dy * -1000) >= 0) {
                            *line_value += (dy * -1000);
                        }
                        break;
                    case 2:
                        if (*line_value + (dy * -60000) >= 0) {
                            *line_value += (dy * -60000);
                        }
                        break;
                    case 3:
                        if (*line_value + (dy * -3600000) >= 0) {
                            *line_value += (dy * -3600000);
                        }
                        break;
                }

                view->cur_index -= dx;
                if (view->cur_index < 0) {
                    view->cur_index = 0;
                }
                if (view->cur_index > 3) {
                    view->cur_index = 3;
                }
                break;
        }
    }
}

static int flipvalo_config_edit_input(InputEvent* event, struct flipvalo_config_edit_view* view) {
    // ignore all but short and repeats
    if (!(event->type == InputTypeShort || event->type == InputTypeRepeat)) {
        return 0;
    }
    switch (event->key) {
        case InputKeyRight:
            flipvalo_config_edit_input_move_cursor(view, 1, 0);
            break;
        case InputKeyLeft:
            flipvalo_config_edit_input_move_cursor(view, -1, 0);
            break;
        case InputKeyUp:
            flipvalo_config_edit_input_move_cursor(view, 0, -1);
            break;
        case InputKeyDown:
            flipvalo_config_edit_input_move_cursor(view, 0, 1);
            break;
        case InputKeyOk:
            //TODO(luna) Check if line supports edit mode before doing this.
            view->edit_mode = !view->edit_mode;
            break;
        case InputKeyBack:
            if (view->edit_mode) {
                view->edit_mode = false;
            } else {
                // exit config edit view
                return 1;
            }
        default:
            break;
    }
    return 0;
}


// XXX(luna) back to app

static void flipvalo_run_state_init(struct flipvalo_run_state* fv_run_state) {
    fv_run_state->burst_cur = 1;
    fv_run_state->shot_cur = 1;
    fv_run_state->tick_next = 0;
    fv_run_state->state = FVDone;
    fv_run_state->tick_next = 0;
    fv_run_state->tick_cur = 0;
}

static void input_callback(InputEvent* input_event, void* event_queue_void) {
    FuriMessageQueue* event_queue = (FuriMessageQueue*) event_queue_void;
    furi_assert(event_queue);
    struct plugin_event event = {.type = EventTypeKey, .input = *input_event };
    furi_message_queue_put(event_queue, &event, FuriWaitForever);
}

static inline bool flipvalo_intv_running(struct flipvalo_priv* fv_priv) {
    return fv_priv->run_state.state != FVDone;
}

static void flipvalo_intv_tick(struct flipvalo_priv* fv_priv) {
    struct flipvalo_config* conf = &fv_priv->config;
    struct flipvalo_run_state* run = &fv_priv->run_state;
    // check if action required
    if (run->tick_cur++ >= run->tick_next) {
        // call trigger function
        flipvalo_get_trigger(conf->trigger)->send(conf->output_config);
        fv_priv->gui_shutter_blink = 3;
        // end of burst, prepare next shot
        if (run->burst_cur >= conf->burst_count) {
            run->burst_cur = 1;
            run->shot_cur++;
            run->state = FVWaitContShot;
            run->tick_next = run->tick_cur + ((conf->interval_delay_msec * conf->tickrate) / 1000);
        }
        else /*continue burst */ {
            run->burst_cur++;
            run->state = FVWaitBurst;
            run->tick_next = run->tick_cur + ((conf->burst_delay_msec * conf->tickrate) / 1000);
        }
    }
    if (run->shot_cur > conf->shot_count) {
        run->state = FVDone;
    }
}

static void flipvalo_intv_stop(struct flipvalo_priv* fv_priv) {
    fv_priv->run_state.state = FVDone;
}

static void flipvalo_intv_start(struct flipvalo_priv* fv_priv) {
    // clear struct
    furi_assert(fv_priv);
    flipvalo_run_state_init(&fv_priv->run_state);
    fv_priv->run_state.state = FVWaitInitShot;
    fv_priv->run_state.tick_next =
        ((fv_priv->config.init_delay_msec * fv_priv->config.tickrate) / 1000);
}

static void timer_callback(void* ctx) {
    furi_assert(ctx);
    struct flipvalo_priv* fv_priv = ctx;
    furi_mutex_acquire(fv_priv->mutex, FuriWaitForever);
    if (flipvalo_intv_running(fv_priv)) {
        flipvalo_intv_tick(fv_priv);
    }
    furi_mutex_release(fv_priv->mutex);
}

static void render_callback(Canvas* const canvas, void* ctx) {
    furi_assert(ctx);
    struct flipvalo_priv* fv_priv = ctx;
    FuriString* temp_str = furi_string_alloc();
    furi_mutex_acquire(fv_priv->mutex, FuriWaitForever);

    // invert screen if blinking
    if (fv_priv->gui_shutter_blink > 0) {
        fv_priv->gui_shutter_blink--;
        canvas_draw_box(canvas, 0, 0, 127, 63);
        canvas_set_color(canvas, ColorWhite);
    }

    if (fv_priv->ui_scene == FVSceneMain) {
        int countdown_msec = (1000 * (fv_priv->run_state.tick_next
                    - fv_priv->run_state.tick_cur))
                / fv_priv->config.tickrate;
        int elapsed_msec = (1000 * fv_priv->run_state.tick_cur)
                / fv_priv->config.tickrate;

        canvas_draw_frame(canvas, 0, 0, 128, 64);

        // draw countdown
        canvas_set_font(canvas, FontPrimary);
        furi_string_printf(
                temp_str, "%02d:%02d:%02d:%03d",
                countdown_msec / 3600000,
                (countdown_msec / 60000) % 60,
                (countdown_msec / 1000) % 60,
                countdown_msec % 1000);
        canvas_draw_str_aligned(
                canvas, 64, 24,
                AlignCenter, AlignCenter,
                furi_string_get_cstr(temp_str));

        // draw top and bottom status bars
        canvas_set_font(canvas, FontSecondary);
        furi_string_printf(
                temp_str, "%02d:%02d:%02d",
                elapsed_msec / 3600000,
                (elapsed_msec / 60000) % 60,
                (elapsed_msec / 1000) % 60);
        canvas_draw_str_aligned(
                canvas, 4, 8,
                AlignLeft, AlignCenter,
                furi_string_get_cstr(temp_str));
        furi_string_printf(temp_str, "Shot: %d", fv_priv->run_state.shot_cur);
        canvas_draw_str_aligned(
                canvas, 124, 8,
                AlignRight, AlignCenter,
                furi_string_get_cstr(temp_str));
        elements_button_left(canvas, "Cfg");
        elements_button_right(canvas, "Snap");
        if (fv_priv->run_state.state == FVDone) {
            elements_button_center(canvas, "Start");
        } else {
            elements_button_center(canvas, "Stop ");
        }
    }
    else if (fv_priv->ui_scene == FVSceneConfig) {
        flipvalo_config_edit_draw(canvas, &fv_priv->config_edit_view);
    }

    furi_string_free(temp_str);
    furi_mutex_release(fv_priv->mutex);
}

static void flipvalo_config_init(struct flipvalo_config* fv_conf) {
    fv_conf->init_delay_msec = 2000;
    fv_conf->interval_delay_msec = 0;
    fv_conf->shot_count = 1;
    fv_conf->burst_count = 1;
    fv_conf->burst_delay_msec = 0;
    fv_conf->tickrate = 125;
    fv_conf->trigger = FvTrigSony;
    fv_conf->output_config = NULL;
}

static void flipvalo_priv_init(struct flipvalo_priv* fv_priv) {
    flipvalo_config_init(&fv_priv->config);
    flipvalo_config_edit_view_init(&fv_priv->config_edit_view);
    flipvalo_run_state_init(&fv_priv->run_state);
    fv_priv->gui_shutter_blink = 0;
    fv_priv->timer = NULL;
    fv_priv->notifications = NULL;
    fv_priv->mutex = furi_mutex_alloc(FuriMutexTypeNormal);
    fv_priv->gui_shutter_blink = 0;
}

int32_t flipvalo_app() {
    int ret = 0;
    ViewPort* view_port = NULL;
    Gui* gui = NULL;
    FuriStatus event_status = {0};
    struct plugin_event event = {0};

    FuriMessageQueue* event_queue = furi_message_queue_alloc(8, sizeof(struct plugin_event));
    struct flipvalo_priv* fv_priv = malloc(sizeof(*fv_priv));

    flipvalo_priv_init(fv_priv);

    if (!fv_priv->mutex) {
        FURI_LOG_E("Flipvalo", "Cannot create mutex\r\n");
        ret = 1;
        goto cleanup;
    }

    view_port = view_port_alloc();
    view_port_draw_callback_set(view_port, render_callback, fv_priv);
    view_port_input_callback_set(view_port, input_callback, event_queue);

    fv_priv->timer = furi_timer_alloc(timer_callback, FuriTimerTypePeriodic, fv_priv);
    furi_timer_start(
            fv_priv->timer,
            (uint32_t) furi_kernel_get_tick_frequency() / fv_priv->config.tickrate);
    gui = furi_record_open("gui");
    gui_add_view_port(gui, view_port, GuiLayerFullscreen);

    while (true) {
        event_status = furi_message_queue_get(event_queue, &event, 100);

        furi_mutex_acquire(fv_priv->mutex, FuriWaitForever);

        // catch event_status that is not Ok
        if (event_status == FuriStatusErrorTimeout) {
            // timeout, ignore
            goto next_event;
        }
        else if (event_status != FuriStatusOk) {
            FURI_LOG_E("Flipvalo", "Event Queue Error: %d\r\n", event_status);
            goto next_event;
            // TODO(luna) evaluate if we should exit here.
            //goto cleanup;
        }

        // handle input
        if ( /* long press back */
            event.type == EventTypeKey
            && event.input.type == InputTypeLong
            && event.input.key == InputKeyBack
        ) {
            goto cleanup;
        }
        switch (fv_priv->ui_scene) {
            case FVSceneMain:
                // TODO(luna) Maybe give this a function.. look howl clean FVSceneConfig is...
                if (event.type == EventTypeKey) {
                    if (event.input.type == InputTypeShort ||
                            event.input.type == InputTypeLong) {
                        switch (event.input.key) {
                            case InputKeyUp:
                                break;
                            case InputKeyDown:
                                break;
                            case InputKeyLeft:
                                flipvalo_intv_stop(fv_priv);
                                fv_priv->config_edit_view.config = &fv_priv->config;
                                fv_priv->ui_scene = FVSceneConfig;
                                break;
                            case InputKeyRight:
                                fv_priv->gui_shutter_blink = 3;
                                flipvalo_get_trigger(fv_priv->config.trigger)
                                    ->send(fv_priv->config.output_config);
                                break;
                            case InputKeyOk:
                                if (flipvalo_intv_running(fv_priv)) {
                                    flipvalo_intv_stop(fv_priv);
                                } else {
                                    flipvalo_intv_start(fv_priv);
                                }
                                break;
                            case InputKeyMAX:
                                break;
                            case InputKeyBack:
                                break;
                        }
                    }
                }
                break;
            case FVSceneConfig:
                ret = flipvalo_config_edit_input(&event.input, &fv_priv->config_edit_view);
                if (ret) {
                    fv_priv->ui_scene = FVSceneMain;
                }
                break;
        }

next_event:
        furi_mutex_release(fv_priv->mutex);
    }

cleanup:
    if (view_port) {
        view_port_enabled_set(view_port, false);
        if (gui) {
            gui_remove_view_port(gui, view_port);
            furi_record_close("gui");
        }
        view_port_free(view_port);
    }
    if (event_queue) {
        furi_message_queue_free(event_queue);
    }
    if (fv_priv) {
        furi_mutex_free(fv_priv->mutex);
        furi_timer_free(fv_priv->timer);
    }
    free(fv_priv);
    return ret;
}