FL-528 GUI: View, ViewDispather. Dolphin: first start. (#276)

* GUI: view. Flooper-blooper fix compilation error.
* GUI: view and viewdispatcher bones
* GUI: view implementation, view models, view dispatcher
* GUI: view navigation, model refinement. Power: use view, view dispatcher.
* HAL Flash: proper page write. Dolphin: views. Power: views
* Dolphin: transition idle scree to Views
* Dolphin: input events on stats view. Format sources.
* HAL: flash erase. Dolphin: permanent state storage.
* Dolphin: first start welcome. HAL: flash operation status, errata 2.2.9 crutch.

applications/dolphin/dolphin.c

@@ -1,100 +1,126 @@
 #include "dolphin_i.h"
 
-void dolphin_draw_callback(Canvas* canvas, void* context) {
+bool dolphin_view_first_start_input(InputEvent* event, void* context) {
+    furi_assert(event);
+    furi_assert(context);
+    Dolphin* dolphin = context;
+    if(event->state) {
+        if(event->input == InputRight) {
+            uint32_t page;
+            with_view_model(
+                dolphin->idle_view_first_start,
+                (DolphinViewFirstStartModel * model) { page = ++model->page; });
+            if(page > 8) {
+                dolphin_save(dolphin);
+                view_dispatcher_switch_to_view(dolphin->idle_view_dispatcher, DolphinViewIdleMain);
+            }
+        }
+    }
+    // All events consumed
+    return true;
+}
+
+bool dolphin_view_idle_main_input(InputEvent* event, void* context) {
+    furi_assert(event);
+    furi_assert(context);
     Dolphin* dolphin = context;
 
-    canvas_clear(canvas);
-    canvas_set_color(canvas, ColorBlack);
-    if(dolphin->screen == DolphinScreenIdle) {
-        dolphin_draw_idle(canvas, dolphin);
-    } else if(dolphin->screen == DolphinScreenDebug) {
-        dolphin_draw_debug(canvas, dolphin);
-    } else if(dolphin->screen == DolphinScreenStats) {
-        dolphin_draw_stats(canvas, dolphin);
-    }
-}
-
-void dolphin_draw_idle(Canvas* canvas, Dolphin* dolphin) {
-    canvas_draw_icon(canvas, 128 - 80, 0, dolphin->icon);
-    canvas_set_font(canvas, FontSecondary);
-    canvas_draw_str(canvas, 2, 10, "/\\: Stats");
-    canvas_draw_str(canvas, 5, 32, "OK: Menu");
-    canvas_draw_str(canvas, 2, 52, "\\/: Version");
-}
-
-void dolphin_draw_debug(Canvas* canvas, Dolphin* dolphin) {
-    canvas_set_font(canvas, FontPrimary);
-    canvas_draw_str(canvas, 2, 10, "Version info:");
-    canvas_set_font(canvas, FontSecondary);
-    canvas_draw_str(canvas, 5, 22, TARGET " " BUILD_DATE);
-    canvas_draw_str(canvas, 5, 32, GIT_BRANCH);
-    canvas_draw_str(canvas, 5, 42, GIT_BRANCH_NUM);
-    canvas_draw_str(canvas, 5, 52, GIT_COMMIT);
-}
-
-void dolphin_draw_stats(Canvas* canvas, Dolphin* dolphin) {
-    canvas_set_font(canvas, FontPrimary);
-    canvas_draw_str(canvas, 2, 10, "Dolphin stats:");
-
-    char buffer[64];
-    canvas_set_font(canvas, FontSecondary);
-    snprintf(buffer, 64, "Icounter: %ld", dolphin_state_get_icounter(dolphin->state));
-    canvas_draw_str(canvas, 5, 22, buffer);
-    snprintf(buffer, 64, "Butthurt: %ld", dolphin_state_get_butthurt(dolphin->state));
-    canvas_draw_str(canvas, 5, 32, buffer);
-    canvas_draw_str(canvas, 5, 40, "< > change icounter");
-}
-
-void dolphin_input_callback(InputEvent* event, void* context) {
-    Dolphin* dolphin = context;
-
-    if(!event->state) return;
-
+    if(event->state) {
         if(event->input == InputOk) {
             with_value_mutex(
                 dolphin->menu_vm, (Menu * menu) { menu_ok(menu); });
         } else if(event->input == InputUp) {
-        if(dolphin->screen != DolphinScreenStats) {
-            dolphin->screen++;
-        }
+            view_dispatcher_switch_to_view(dolphin->idle_view_dispatcher, DolphinViewIdleStats);
         } else if(event->input == InputDown) {
-        if(dolphin->screen != DolphinScreenDebug) {
-            dolphin->screen--;
+            view_dispatcher_switch_to_view(dolphin->idle_view_dispatcher, DolphinViewIdleDebug);
         }
-    } else if(event->input == InputBack) {
-        dolphin->screen = DolphinScreenIdle;
-    } else if(event->input == InputLeft) {
-        dolphin_deed(dolphin, DolphinDeedIButtonEmulate);
-    } else if(event->input == InputRight) {
-        dolphin_deed(dolphin, DolphinDeedWrong);
+    }
+    // All events consumed
+    return true;
 }
 
-    widget_update(dolphin->widget);
+bool dolphin_view_idle_stats_input(InputEvent* event, void* context) {
+    furi_assert(event);
+    furi_assert(context);
+    Dolphin* dolphin = context;
+
+    if(!event->state) return false;
+
+    if(event->input == InputLeft) {
+        dolphin_deed(dolphin, DolphinDeedWrong);
+    } else if(event->input == InputRight) {
+        dolphin_deed(dolphin, DolphinDeedIButtonRead);
+    } else if(event->input == InputOk) {
+        dolphin_save(dolphin);
+    } else {
+        return false;
+    }
+
+    return true;
 }
 
 Dolphin* dolphin_alloc() {
     Dolphin* dolphin = furi_alloc(sizeof(Dolphin));
-
-    dolphin->icon = assets_icons_get(I_Flipper_young_80x60);
-    icon_start_animation(dolphin->icon);
-
-    dolphin->widget = widget_alloc();
-    widget_draw_callback_set(dolphin->widget, dolphin_draw_callback, dolphin);
-    widget_input_callback_set(dolphin->widget, dolphin_input_callback, dolphin);
-
-    dolphin->menu_vm = furi_open("menu");
-    furi_check(dolphin->menu_vm);
-
-    dolphin->state = dolphin_state_alloc();
-
-    dolphin->screen = DolphinScreenIdle;
-
+    // Message queue
     dolphin->event_queue = osMessageQueueNew(8, sizeof(DolphinEvent), NULL);
     furi_check(dolphin->event_queue);
+    // State
+    dolphin->state = dolphin_state_alloc();
+    // Menu
+    dolphin->menu_vm = furi_open("menu");
+    furi_check(dolphin->menu_vm);
+    // GUI
+    dolphin->idle_view_dispatcher = view_dispatcher_alloc();
+    // First start View
+    dolphin->idle_view_first_start = view_alloc();
+    view_allocate_model(
+        dolphin->idle_view_first_start, ViewModelTypeLockFree, sizeof(DolphinViewFirstStartModel));
+    view_set_context(dolphin->idle_view_first_start, dolphin);
+    view_set_draw_callback(dolphin->idle_view_first_start, dolphin_view_first_start_draw);
+    view_set_input_callback(dolphin->idle_view_first_start, dolphin_view_first_start_input);
+    view_dispatcher_add_view(
+        dolphin->idle_view_dispatcher, DolphinViewFirstStart, dolphin->idle_view_first_start);
+    // Main Idle View
+    dolphin->idle_view_main = view_alloc();
+    view_set_context(dolphin->idle_view_main, dolphin);
+    view_set_draw_callback(dolphin->idle_view_main, dolphin_view_idle_main_draw);
+    view_set_input_callback(dolphin->idle_view_main, dolphin_view_idle_main_input);
+    view_dispatcher_add_view(
+        dolphin->idle_view_dispatcher, DolphinViewIdleMain, dolphin->idle_view_main);
+    // Stats Idle View
+    dolphin->idle_view_stats = view_alloc();
+    view_set_context(dolphin->idle_view_stats, dolphin);
+    view_allocate_model(
+        dolphin->idle_view_stats, ViewModelTypeLockFree, sizeof(DolphinViewIdleStatsModel));
+    with_view_model(
+        dolphin->idle_view_stats, (DolphinViewIdleStatsModel * model) {
+            model->icounter = dolphin_state_get_icounter(dolphin->state);
+            model->butthurt = dolphin_state_get_butthurt(dolphin->state);
+        });
+    view_set_draw_callback(dolphin->idle_view_stats, dolphin_view_idle_stats_draw);
+    view_set_input_callback(dolphin->idle_view_stats, dolphin_view_idle_stats_input);
+    view_set_previous_callback(dolphin->idle_view_stats, dolphin_view_idle_back);
+    view_dispatcher_add_view(
+        dolphin->idle_view_dispatcher, DolphinViewIdleStats, dolphin->idle_view_stats);
+    // Debug Idle View
+    dolphin->idle_view_debug = view_alloc();
+    view_set_draw_callback(dolphin->idle_view_debug, dolphin_view_idle_debug_draw);
+    view_set_previous_callback(dolphin->idle_view_debug, dolphin_view_idle_back);
+    view_dispatcher_add_view(
+        dolphin->idle_view_dispatcher, DolphinViewIdleDebug, dolphin->idle_view_debug);
+
     return dolphin;
 }
 
+void dolphin_save(Dolphin* dolphin) {
+    furi_assert(dolphin);
+    DolphinEvent event;
+    event.type = DolphinEventTypeSave;
+    furi_check(osMessageQueuePut(dolphin->event_queue, &event, 0, osWaitForever) == osOK);
+}
+
 void dolphin_deed(Dolphin* dolphin, DolphinDeed deed) {
+    furi_assert(dolphin);
     DolphinEvent event;
     event.type = DolphinEventTypeDeed;
     event.deed = deed;
@@ -105,7 +131,12 @@ void dolphin_task() {
     Dolphin* dolphin = dolphin_alloc();
 
     Gui* gui = furi_open("gui");
-    gui_add_widget(gui, dolphin->widget, GuiLayerNone);
+    view_dispatcher_attach_to_gui(dolphin->idle_view_dispatcher, gui, ViewDispatcherTypeWindow);
+    if(dolphin_state_load(dolphin->state)) {
+        view_dispatcher_switch_to_view(dolphin->idle_view_dispatcher, DolphinViewIdleMain);
+    } else {
+        view_dispatcher_switch_to_view(dolphin->idle_view_dispatcher, DolphinViewFirstStart);
+    }
 
     if(!furi_create("dolphin", dolphin)) {
         printf("[dolphin_task] cannot create the dolphin record\n");
@@ -119,6 +150,13 @@ void dolphin_task() {
         furi_check(osMessageQueueGet(dolphin->event_queue, &event, NULL, osWaitForever) == osOK);
         if(event.type == DolphinEventTypeDeed) {
             dolphin_state_on_deed(dolphin->state, event.deed);
+            with_view_model(
+                dolphin->idle_view_stats, (DolphinViewIdleStatsModel * model) {
+                    model->icounter = dolphin_state_get_icounter(dolphin->state);
+                    model->butthurt = dolphin_state_get_butthurt(dolphin->state);
+                });
+        } else if(event.type == DolphinEventTypeSave) {
+            dolphin_state_save(dolphin->state);
         }
     }
 }

applications/dolphin/dolphin.h

@@ -4,8 +4,8 @@
 
 typedef struct Dolphin Dolphin;
 
-/*
- * Deed complete notification. Call it on deed completion.
+/* Deed complete notification. Call it on deed completion.
  * See dolphin_deed.h for available deeds. In futures it will become part of assets.
+ * Thread safe
  */
 void dolphin_deed(Dolphin* dolphin, DolphinDeed deed);

applications/dolphin/dolphin_i.h

@@ -2,20 +2,21 @@
 
 #include "dolphin.h"
 #include "dolphin_state.h"
+#include "dolphin_views.h"
 
 #include <flipper_v2.h>
 
 #include <gui/gui.h>
-#include <gui/widget.h>
+#include <gui/view_dispatcher.h>
 #include <gui/canvas.h>
 #include <menu/menu.h>
 
 #include <assets_icons.h>
-
 #include <stdint.h>
 
 typedef enum {
     DolphinEventTypeDeed,
+    DolphinEventTypeSave,
 } DolphinEventType;
 
 typedef struct {
@@ -25,27 +26,24 @@ typedef struct {
     };
 } DolphinEvent;
 
-typedef enum {
-    DolphinScreenDebug,
-    DolphinScreenIdle,
-    DolphinScreenStats,
-} DolphinScreen;
-
 struct Dolphin {
-    Icon* icon;
-    Widget* widget;
-    ValueMutex* menu_vm;
-    // State
-    DolphinState* state;
-    DolphinScreen screen;
     // Internal message queue
     osMessageQueueId_t event_queue;
+    // State
+    DolphinState* state;
+    // Menu
+    ValueMutex* menu_vm;
+    // GUI
+    ViewDispatcher* idle_view_dispatcher;
+    View* idle_view_first_start;
+    View* idle_view_main;
+    View* idle_view_stats;
+    View* idle_view_debug;
 };
 
-void dolphin_draw_callback(Canvas* canvas, void* context);
-void dolphin_draw_idle(Canvas* canvas, Dolphin* dolphin);
-void dolphin_draw_debug(Canvas* canvas, Dolphin* dolphin);
-void dolphin_draw_stats(Canvas* canvas, Dolphin* dolphin);
-void dolphin_input_callback(InputEvent* event, void* context);
-
 Dolphin* dolphin_alloc();
+
+/* Save Dolphin state (write to permanent memory)
+ * Thread safe
+ */
+void dolphin_save(Dolphin* dolphin);

applications/dolphin/dolphin_state.c

@@ -1,18 +1,35 @@
 #include "dolphin_state.h"
+#include <api-hal-flash.h>
 #include <flipper_v2.h>
 
 typedef struct {
-    uint32_t ibutton;
-    uint32_t nfc;
-    uint32_t ir;
-    uint32_t rfid;
-} DolphinLimit;
+    uint8_t magic;
+    uint8_t version;
+    uint8_t checksum;
+    uint8_t flags;
+    uint32_t timestamp;
+} DolphinDataHeader;
 
-struct DolphinState {
+#define DOLPHIN_DATA_PAGE 0xC0
+#define DOLPHIN_DATA_HEADER_ADDRESS 0x080C0000U
+#define DOLPHIN_DATA_DATA_ADDRESS (DOLPHIN_DATA_HEADER_ADDRESS + sizeof(DolphinDataHeader))
+
+#define DOLPHIN_DATA_HEADER_MAGIC 0xD0
+#define DOLPHIN_DATA_HEADER_VERSION 0x00
+
+typedef struct {
+    uint32_t limit_ibutton;
+    uint32_t limit_nfc;
+    uint32_t limit_ir;
+    uint32_t limit_rfid;
+
+    uint32_t flags;
     uint32_t icounter;
     uint32_t butthurt;
+} DolphinData;
 
-    DolphinLimit limit;
+struct DolphinState {
+    DolphinData data;
 };
 
 DolphinState* dolphin_state_alloc() {
@@ -24,29 +41,81 @@ void dolphin_state_release(DolphinState* dolphin_state) {
     free(dolphin_state);
 }
 
-void dolphin_state_save(DolphinState* dolphin_state) {
+bool dolphin_state_save(DolphinState* dolphin_state) {
+    if(!api_hal_flash_erase(DOLPHIN_DATA_PAGE, 1)) {
+        return false;
     }
 
-void dolphin_state_load(DolphinState* dolphin_state) {
+    uint8_t* source = (uint8_t*)&dolphin_state->data;
+    uint8_t checksum = 0;
+    for(size_t i = 0; i < sizeof(DolphinData); i++) {
+        checksum += source[i];
+    }
+    DolphinDataHeader header;
+    header.magic = DOLPHIN_DATA_HEADER_MAGIC;
+    header.version = DOLPHIN_DATA_HEADER_VERSION;
+    header.checksum = checksum;
+    header.flags = 0;
+    header.timestamp = 0;
+    if(!api_hal_flash_write_dword(DOLPHIN_DATA_HEADER_ADDRESS, *(uint64_t*)&header)) {
+        return false;
+    }
+
+    uint8_t destination[sizeof(uint64_t)];
+    size_t block_count = sizeof(DolphinData) / sizeof(uint64_t) + 1;
+    size_t offset = 0;
+    for(size_t i = 0; i < block_count; i++) {
+        for(size_t n = 0; n < sizeof(uint64_t); n++) {
+            if(offset < sizeof(DolphinData)) {
+                destination[n] = source[offset];
+            } else {
+                destination[n] = 0;
+            }
+            offset++;
+        }
+        if(!api_hal_flash_write_dword(
+               DOLPHIN_DATA_DATA_ADDRESS + i * sizeof(uint64_t), *(uint64_t*)destination)) {
+            return false;
+        }
+    }
+    return true;
+}
+
+bool dolphin_state_load(DolphinState* dolphin_state) {
+    const DolphinDataHeader* header = (const DolphinDataHeader*)DOLPHIN_DATA_HEADER_ADDRESS;
+    if(header->magic == DOLPHIN_DATA_HEADER_MAGIC &&
+       header->version == DOLPHIN_DATA_HEADER_VERSION) {
+        uint8_t checksum = 0;
+        const uint8_t* source = (const uint8_t*)DOLPHIN_DATA_DATA_ADDRESS;
+        for(size_t i = 0; i < sizeof(DolphinData); i++) {
+            checksum += source[i];
+        }
+        if(header->checksum == checksum) {
+            memcpy(
+                &dolphin_state->data, (const void*)DOLPHIN_DATA_DATA_ADDRESS, sizeof(DolphinData));
+            return true;
+        }
+    }
+    return false;
 }
 
 void dolphin_state_clear(DolphinState* dolphin_state) {
-    memset(dolphin_state, 0, sizeof(DolphinState));
+    memset(&dolphin_state->data, 0, sizeof(DolphinData));
 }
 
 void dolphin_state_on_deed(DolphinState* dolphin_state, DolphinDeed deed) {
     const DolphinDeedWeight* deed_weight = dolphin_deed_weight(deed);
-    int32_t icounter = dolphin_state->icounter + deed_weight->icounter;
+    int32_t icounter = dolphin_state->data.icounter + deed_weight->icounter;
 
     if(icounter >= 0) {
-        dolphin_state->icounter = icounter;
+        dolphin_state->data.icounter = icounter;
     }
 }
 
 uint32_t dolphin_state_get_icounter(DolphinState* dolphin_state) {
-    return dolphin_state->icounter;
+    return dolphin_state->data.icounter;
 }
 
 uint32_t dolphin_state_get_butthurt(DolphinState* dolphin_state) {
-    return dolphin_state->butthurt;
+    return dolphin_state->data.butthurt;
 }

applications/dolphin/dolphin_state.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "dolphin_deed.h"
+#include <stdbool.h>
 #include <stdint.h>
 
 typedef struct DolphinState DolphinState;
@@ -9,9 +10,9 @@ DolphinState* dolphin_state_alloc();
 
 void dolphin_state_release(DolphinState* dolphin_state);
 
-void dolphin_state_save(DolphinState* dolphin_state);
+bool dolphin_state_save(DolphinState* dolphin_state);
 
-void dolphin_state_load(DolphinState* dolphin_state);
+bool dolphin_state_load(DolphinState* dolphin_state);
 
 void dolphin_state_clear(DolphinState* dolphin_state);
 

applications/dolphin/dolphin_views.c

@@ -0,0 +1,69 @@
+#include "dolphin_views.h"
+#include <gui/view.h>
+
+void dolphin_view_first_start_draw(Canvas* canvas, void* model) {
+    DolphinViewFirstStartModel* m = model;
+    canvas_clear(canvas);
+    canvas_set_color(canvas, ColorBlack);
+    if(m->page == 0) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart0_128x54);
+    } else if(m->page == 1) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart1_128x54);
+    } else if(m->page == 2) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart2_128x54);
+    } else if(m->page == 3) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart3_128x54);
+    } else if(m->page == 4) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart4_128x54);
+    } else if(m->page == 5) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart5_128x54);
+    } else if(m->page == 6) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart6_128x54);
+    } else if(m->page == 7) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart7_128x54);
+    } else if(m->page == 8) {
+        canvas_draw_icon_name(canvas, 0, 1, I_DolphinFirstStart8_128x54);
+    }
+}
+
+void dolphin_view_idle_main_draw(Canvas* canvas, void* model) {
+    canvas_clear(canvas);
+    canvas_set_color(canvas, ColorBlack);
+    canvas_draw_icon_name(canvas, 128 - 80, 0, I_Flipper_young_80x60);
+    canvas_set_font(canvas, FontSecondary);
+    canvas_draw_str(canvas, 2, 10, "/\\: Stats");
+    canvas_draw_str(canvas, 5, 32, "OK: Menu");
+    canvas_draw_str(canvas, 2, 52, "\\/: Version");
+}
+
+void dolphin_view_idle_stats_draw(Canvas* canvas, void* model) {
+    DolphinViewIdleStatsModel* m = model;
+    canvas_clear(canvas);
+    canvas_set_color(canvas, ColorBlack);
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str(canvas, 2, 10, "Dolphin stats:");
+
+    char buffer[64];
+    canvas_set_font(canvas, FontSecondary);
+    snprintf(buffer, 64, "Icounter: %ld", m->icounter);
+    canvas_draw_str(canvas, 5, 22, buffer);
+    snprintf(buffer, 64, "Butthurt: %ld", m->butthurt);
+    canvas_draw_str(canvas, 5, 32, buffer);
+    canvas_draw_str(canvas, 5, 40, "< > change icounter");
+}
+
+void dolphin_view_idle_debug_draw(Canvas* canvas, void* model) {
+    canvas_clear(canvas);
+    canvas_set_color(canvas, ColorBlack);
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str(canvas, 2, 10, "Version info:");
+    canvas_set_font(canvas, FontSecondary);
+    canvas_draw_str(canvas, 5, 22, TARGET " " BUILD_DATE);
+    canvas_draw_str(canvas, 5, 32, GIT_BRANCH);
+    canvas_draw_str(canvas, 5, 42, GIT_BRANCH_NUM);
+    canvas_draw_str(canvas, 5, 52, GIT_COMMIT);
+}
+
+uint32_t dolphin_view_idle_back(void* context) {
+    return DolphinViewIdleMain;
+}

applications/dolphin/dolphin_views.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <gui/canvas.h>
+#include <flipper_v2.h>
+
+// Idle scree
+typedef enum {
+    DolphinViewFirstStart,
+    DolphinViewIdleMain,
+    DolphinViewIdleStats,
+    DolphinViewIdleDebug,
+} DolphinViewIdle;
+
+typedef struct {
+    uint32_t page;
+} DolphinViewFirstStartModel;
+
+void dolphin_view_first_start_draw(Canvas* canvas, void* model);
+bool dolphin_view_first_start_input(InputEvent* event, void* context);
+
+typedef struct {
+    uint32_t icounter;
+    uint32_t butthurt;
+} DolphinViewIdleStatsModel;
+
+void dolphin_view_idle_main_draw(Canvas* canvas, void* model);
+bool dolphin_view_idle_main_input(InputEvent* event, void* context);
+void dolphin_view_idle_stats_draw(Canvas* canvas, void* model);
+bool dolphin_view_idle_stats_input(InputEvent* event, void* context);
+void dolphin_view_idle_debug_draw(Canvas* canvas, void* model);
+uint32_t dolphin_view_idle_back(void* context);

applications/gui/canvas.c

@@ -1,5 +1,4 @@
 #include "canvas_i.h"
-#include "icon.h"
 #include "icon_i.h"
 
 #include <flipper.h>
@@ -113,6 +112,14 @@ void canvas_draw_icon(Canvas* canvas, uint8_t x, uint8_t y, Icon* icon) {
         &canvas->fb, x, y, icon_get_width(icon), icon_get_height(icon), icon_get_data(icon));
 }
 
+void canvas_draw_icon_name(Canvas* canvas, uint8_t x, uint8_t y, IconName name) {
+    furi_assert(canvas);
+    const IconData* data = assets_icons_get_data(name);
+    x += canvas->offset_x;
+    y += canvas->offset_y;
+    u8g2_DrawXBM(&canvas->fb, x, y, data->width, data->height, data->frames[0]);
+}
+
 void canvas_draw_dot(Canvas* canvas, uint8_t x, uint8_t y) {
     furi_assert(canvas);
     x += canvas->offset_x;

applications/gui/canvas.h

@@ -3,6 +3,7 @@
 #include <stdint.h>
 #include <u8g2.h>
 #include <gui/icon.h>
+#include <assets_icons_i.h>
 
 typedef enum {
     ColorWhite = 0x00,
@@ -46,10 +47,15 @@ void canvas_set_font(Canvas* canvas, Font font);
 void canvas_draw_str(Canvas* canvas, uint8_t x, uint8_t y, const char* str);
 
 /*
- * Draw icon at position defined by x,y.
+ * Draw stateful icon at position defined by x,y.
  */
 void canvas_draw_icon(Canvas* canvas, uint8_t x, uint8_t y, Icon* icon);
 
+/*
+ * Draw stateless icon at position defined by x,y.
+ */
+void canvas_draw_icon_name(Canvas* canvas, uint8_t x, uint8_t y, IconName name);
+
 /*
  * Draw xbm icon of width, height at position defined by x,y.
  */

applications/gui/view.c

@@ -0,0 +1,140 @@
+#include "view_i.h"
+
+View* view_alloc() {
+    View* view = furi_alloc(sizeof(View));
+    return view;
+}
+
+void view_free(View* view) {
+    furi_assert(view);
+    view_free_model(view);
+    free(view);
+}
+
+void view_set_dispatcher(View* view, ViewDispatcher* view_dispatcher) {
+    furi_assert(view);
+    furi_assert(view_dispatcher);
+    furi_assert(view->dispatcher == NULL);
+    view->dispatcher = view_dispatcher;
+}
+
+void view_set_draw_callback(View* view, ViewDrawCallback callback) {
+    furi_assert(view);
+    furi_assert(view->draw_callback == NULL);
+    view->draw_callback = callback;
+}
+
+void view_set_input_callback(View* view, ViewInputCallback callback) {
+    furi_assert(view);
+    furi_assert(view->input_callback == NULL);
+    view->input_callback = callback;
+}
+
+void view_set_previous_callback(View* view, ViewNavigationCallback callback) {
+    furi_assert(view);
+    view->previous_callback = callback;
+}
+
+void view_set_next_callback(View* view, ViewNavigationCallback callback) {
+    furi_assert(view);
+    view->next_callback = callback;
+}
+
+void view_set_context(View* view, void* context) {
+    furi_assert(view);
+    furi_assert(context);
+    view->context = context;
+}
+
+void view_allocate_model(View* view, ViewModelType type, size_t size) {
+    furi_assert(view);
+    furi_assert(size > 0);
+    furi_assert(view->model_type == ViewModelTypeNone);
+    furi_assert(view->model == NULL);
+    view->model_type = type;
+    if(view->model_type == ViewModelTypeLockFree) {
+        view->model = furi_alloc(size);
+    } else if(view->model_type == ViewModelTypeLocking) {
+        ViewModelLocking* model = furi_alloc(sizeof(ViewModelLocking));
+        model->mutex = osMutexNew(NULL);
+        furi_check(model->mutex);
+        model->data = furi_alloc(size);
+        view->model = model;
+    } else {
+        furi_assert(false);
+    }
+}
+
+void view_free_model(View* view) {
+    furi_assert(view);
+    if(view->model_type == ViewModelTypeNone) {
+        return;
+    } else if(view->model_type == ViewModelTypeLockFree) {
+        free(view->model);
+    } else if(view->model_type == ViewModelTypeLocking) {
+        ViewModelLocking* model = view->model;
+        furi_check(osMutexDelete(model->mutex) == osOK);
+        free(model->data);
+        free(model);
+        view->model = NULL;
+    } else {
+        furi_assert(false);
+    }
+}
+
+void* view_get_model(View* view) {
+    furi_assert(view);
+    if(view->model_type == ViewModelTypeLocking) {
+        ViewModelLocking* model = (ViewModelLocking*)(view->model);
+        furi_check(osMutexAcquire(model->mutex, osWaitForever) == osOK);
+        return model->data;
+    }
+    return view->model;
+}
+
+void view_commit_model(View* view) {
+    furi_assert(view);
+    if(view->model_type == ViewModelTypeLocking) {
+        ViewModelLocking* model = (ViewModelLocking*)(view->model);
+        furi_check(osMutexRelease(model->mutex) == osOK);
+    }
+    if(view->dispatcher) {
+        view_dispatcher_update(view->dispatcher, view);
+    }
+}
+
+void view_draw(View* view, Canvas* canvas) {
+    furi_assert(view);
+    if(view->draw_callback) {
+        void* data = view_get_model(view);
+        view->draw_callback(canvas, data);
+        view_commit_model(view);
+    }
+}
+
+bool view_input(View* view, InputEvent* event) {
+    furi_assert(view);
+    if(view->input_callback) {
+        return view->input_callback(event, view->context);
+    } else {
+        return false;
+    }
+}
+
+uint32_t view_previous(View* view) {
+    furi_assert(view);
+    if(view->previous_callback) {
+        return view->previous_callback(view->context);
+    } else {
+        return VIEW_IGNORE;
+    }
+}
+
+uint32_t view_next(View* view) {
+    furi_assert(view);
+    if(view->next_callback) {
+        return view->next_callback(view->context);
+    } else {
+        return VIEW_IGNORE;
+    }
+}

applications/gui/view.h

@@ -0,0 +1,129 @@
+#pragma once
+
+#include <input/input.h>
+#include "canvas.h"
+
+/* Hides drawing widget */
+#define VIEW_NONE 0xFFFFFFFF
+/* Ignore navigation event */
+#define VIEW_IGNORE 0xFFFFFFFE
+/* Deatch from gui, deallocate Views and ViewDispatcher
+ * BE SUPER CAREFUL, deallocation happens automatically on GUI thread
+ * You ARE NOT owning ViewDispatcher and Views instances
+ */
+#define VIEW_DESTROY 0xFFFFFFFA
+
+/* View Draw callback
+ * @param canvas, pointer to canvas
+ * @param view_model, pointer to context
+ * @warning called from GUI thread
+ */
+typedef void (*ViewDrawCallback)(Canvas* canvas, void* model);
+
+/* View Input callback
+ * @param event, pointer to input event data
+ * @param context, pointer to context
+ * @return true if event handled, false if event ignored
+ * @warning called from GUI thread
+ */
+typedef bool (*ViewInputCallback)(InputEvent* event, void* context);
+
+/* View navigation callback
+ * @param context, pointer to context
+ * @return next view id
+ * @warning called from GUI thread
+ */
+typedef uint32_t (*ViewNavigationCallback)(void* context);
+
+/* View model types */
+typedef enum {
+    /* Model is not allocated */
+    ViewModelTypeNone,
+    /* Model consist of atomic types and/or partial update is not critical for rendering.
+     * Lock free.
+     */
+    ViewModelTypeLockFree,
+    /* Model access is guarded with mutex.
+     * Locking gui thread.
+     */
+    ViewModelTypeLocking,
+} ViewModelType;
+
+typedef struct View View;
+
+/* Allocate and init View
+ * @return pointer to View
+ */
+View* view_alloc();
+
+/* Free View
+ * @param pointer to View
+ */
+void view_free(View* view);
+
+/* Set View Draw callback
+ * @param view, pointer to View
+ * @param callback, draw callback
+ */
+void view_set_draw_callback(View* view, ViewDrawCallback callback);
+
+/* Set View Draw callback
+ * @param view, pointer to View
+ * @param callback, input callback
+ */
+void view_set_input_callback(View* view, ViewInputCallback callback);
+
+/* Set Navigation Previous callback
+ * @param view, pointer to View
+ * @param callback, input callback
+ */
+void view_set_previous_callback(View* view, ViewNavigationCallback callback);
+
+/* Set Navigation Next callback
+ * @param view, pointer to View
+ * @param callback, input callback
+ */
+void view_set_next_callback(View* view, ViewNavigationCallback callback);
+
+/* Set View Draw callback
+ * @param view, pointer to View
+ * @param context, context for callbacks
+ */
+void view_set_context(View* view, void* context);
+
+/* Allocate view model.
+ * @param view, pointer to View
+ * @param type, View Model Type
+ * @param size, size
+ */
+void view_allocate_model(View* view, ViewModelType type, size_t size);
+
+/* Free view model data memory.
+ * @param view, pointer to View
+ */
+void view_free_model(View* view);
+
+/* Get view model data
+ * @param view, pointer to View
+ * @return pointer to model data
+ * @warning Don't forget to commit model changes
+ */
+void* view_get_model(View* view);
+
+/* Commit view model
+ * @param view, pointer to View
+ */
+void view_commit_model(View* view);
+
+/* 
+ * With clause for view model
+ * @param view, View instance pointer
+ * @param function_body a (){} lambda declaration,
+ * executed within you parent function context.
+ */
+#define with_view_model(view, function_body)        \
+    {                                               \
+        void* p = view_get_model(view);             \
+        ({ void __fn__ function_body __fn__; })(p); \
+        view_commit_model(view);                    \
+    }

applications/gui/view_dispatcher.c

@@ -0,0 +1,113 @@
+#include "view_dispatcher_i.h"
+
+ViewDispatcher* view_dispatcher_alloc() {
+    ViewDispatcher* view_dispatcher = furi_alloc(sizeof(ViewDispatcher));
+
+    view_dispatcher->widget = widget_alloc();
+    widget_draw_callback_set(
+        view_dispatcher->widget, view_dispatcher_draw_callback, view_dispatcher);
+    widget_input_callback_set(
+        view_dispatcher->widget, view_dispatcher_input_callback, view_dispatcher);
+    widget_enabled_set(view_dispatcher->widget, false);
+
+    ViewDict_init(view_dispatcher->views);
+
+    return view_dispatcher;
+}
+
+void view_dispatcher_free(ViewDispatcher* view_dispatcher) {
+    // Detach from gui
+    if(view_dispatcher->gui) {
+        gui_remove_widget(view_dispatcher->gui, view_dispatcher->widget);
+    }
+    // Free views
+    ViewDict_it_t it;
+    ViewDict_it(it, view_dispatcher->views);
+    while(!ViewDict_end_p(it)) {
+        ViewDict_itref_t* ref = ViewDict_ref(it);
+        view_free(ref->value);
+        ViewDict_next(it);
+    }
+    ViewDict_clear(view_dispatcher->views);
+    // Free dispatcher
+    free(view_dispatcher);
+}
+
+void view_dispatcher_add_view(ViewDispatcher* view_dispatcher, uint32_t view_id, View* view) {
+    furi_assert(view_dispatcher);
+    furi_assert(view);
+    // Check if view id is not used and resgister view
+    furi_check(ViewDict_get(view_dispatcher->views, view_id) == NULL);
+    ViewDict_set_at(view_dispatcher->views, view_id, view);
+    view_set_dispatcher(view, view_dispatcher);
+}
+
+void view_dispatcher_switch_to_view(ViewDispatcher* view_dispatcher, uint32_t view_id) {
+    furi_assert(view_dispatcher);
+    if(view_id == VIEW_NONE) {
+        view_dispatcher->current_view = NULL;
+        widget_enabled_set(view_dispatcher->widget, false);
+    } else if(view_id == VIEW_IGNORE) {
+    } else if(view_id == VIEW_DESTROY) {
+        view_dispatcher_free(view_dispatcher);
+    } else {
+        View** view_pp = ViewDict_get(view_dispatcher->views, view_id);
+        furi_check(view_pp != NULL);
+        view_dispatcher->current_view = *view_pp;
+        widget_enabled_set(view_dispatcher->widget, true);
+        widget_update(view_dispatcher->widget);
+    }
+}
+
+void view_dispatcher_attach_to_gui(
+    ViewDispatcher* view_dispatcher,
+    Gui* gui,
+    ViewDispatcherType type) {
+    furi_assert(view_dispatcher);
+    furi_assert(view_dispatcher->gui == NULL);
+    furi_assert(gui);
+
+    if(type == ViewDispatcherTypeNone) {
+        gui_add_widget(gui, view_dispatcher->widget, GuiLayerNone);
+    } else if(type == ViewDispatcherTypeFullscreen) {
+        gui_add_widget(gui, view_dispatcher->widget, GuiLayerFullscreen);
+    } else if(type == ViewDispatcherTypeWindow) {
+        gui_add_widget(gui, view_dispatcher->widget, GuiLayerMain);
+    } else {
+        furi_check(NULL);
+    }
+    view_dispatcher->gui = gui;
+}
+
+void view_dispatcher_draw_callback(Canvas* canvas, void* context) {
+    ViewDispatcher* view_dispatcher = context;
+    if(view_dispatcher->current_view) {
+        view_draw(view_dispatcher->current_view, canvas);
+    }
+}
+
+void view_dispatcher_input_callback(InputEvent* event, void* context) {
+    ViewDispatcher* view_dispatcher = context;
+    bool is_consumed = false;
+    if(view_dispatcher->current_view) {
+        is_consumed = view_input(view_dispatcher->current_view, event);
+    }
+    if(!is_consumed && event->state) {
+        uint32_t view_id = VIEW_IGNORE;
+        if(event->input == InputBack) {
+            view_id = view_previous(view_dispatcher->current_view);
+        } else if(event->input == InputOk) {
+            view_id = view_next(view_dispatcher->current_view);
+        }
+        view_dispatcher_switch_to_view(view_dispatcher, view_id);
+    }
+}
+
+void view_dispatcher_update(ViewDispatcher* view_dispatcher, View* view) {
+    furi_assert(view_dispatcher);
+    furi_assert(view);
+
+    if(view_dispatcher->current_view == view) {
+        widget_update(view_dispatcher->widget);
+    }
+}

applications/gui/view_dispatcher.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include "view.h"
+#include "gui.h"
+
+/* ViewDispatcher widget placement */
+typedef enum {
+    ViewDispatcherTypeNone, /* Special layer for internal use only */
+    ViewDispatcherTypeWindow, /* Main widget layer, status bar is shown */
+    ViewDispatcherTypeFullscreen /* Fullscreen widget layer */
+} ViewDispatcherType;
+
+typedef struct ViewDispatcher ViewDispatcher;
+
+/* Allocate ViewDispatcher
+ * @return pointer to ViewDispatcher instance
+ */
+ViewDispatcher* view_dispatcher_alloc();
+
+/* Free ViewDispatcher
+ * @param pointer to View
+ */
+void view_dispatcher_free(ViewDispatcher* view_dispatcher);
+
+/* Add view to ViewDispatcher
+ * @param view_dispatcher, ViewDispatcher instance
+ * @param view_id, View id to register
+ * @param view, View instance
+ */
+void view_dispatcher_add_view(ViewDispatcher* view_dispatcher, uint32_t view_id, View* view);
+
+/* Switch to View
+ * @param view_dispatcher, ViewDispatcher instance
+ * @param view_id, View id to register
+ */
+void view_dispatcher_switch_to_view(ViewDispatcher* view_dispatcher, uint32_t view_id);
+
+/* Attach ViewDispatcher to GUI
+ * @param view_dispatcher, ViewDispatcher instance
+ * @param gui, GUI instance to attach to
+ */
+void view_dispatcher_attach_to_gui(
+    ViewDispatcher* view_dispatcher,
+    Gui* gui,
+    ViewDispatcherType type);

applications/gui/view_dispatcher_i.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "view_dispatcher.h"
+#include "view_i.h"
+#include <flipper_v2.h>
+#include <m-dict.h>
+
+DICT_DEF2(ViewDict, uint32_t, M_DEFAULT_OPLIST, View*, M_PTR_OPLIST)
+
+struct ViewDispatcher {
+    Gui* gui;
+    Widget* widget;
+    ViewDict_t views;
+    View* current_view;
+};
+
+/* Widget Draw Callback */
+void view_dispatcher_draw_callback(Canvas* canvas, void* context);
+
+/* Widget Input Callback */
+void view_dispatcher_input_callback(InputEvent* event, void* context);
+
+/* View to ViewDispatcher update event */
+void view_dispatcher_update(ViewDispatcher* view_dispatcher, View* view);

applications/gui/view_i.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "view.h"
+#include "view_dispatcher_i.h"
+#include <flipper_v2.h>
+
+typedef struct {
+    void* data;
+    osMutexId_t mutex;
+} ViewModelLocking;
+
+struct View {
+    ViewDispatcher* dispatcher;
+    ViewDrawCallback draw_callback;
+    ViewInputCallback input_callback;
+    ViewModelType model_type;
+    ViewNavigationCallback previous_callback;
+    ViewNavigationCallback next_callback;
+    void* model;
+    void* context;
+};
+
+/* Set View dispatcher */
+void view_set_dispatcher(View* view, ViewDispatcher* view_dispatcher);
+
+/* Draw Callback for View dispatcher */
+void view_draw(View* view, Canvas* canvas);
+
+/* Input Callback for View dispatcher */
+bool view_input(View* view, InputEvent* event);
+
+/* Previous Callback for View dispatcher */
+uint32_t view_previous(View* view);
+
+/* Next Callback for View dispatcher */
+uint32_t view_next(View* view);

applications/gui/widget.h

@@ -9,7 +9,7 @@ typedef struct Widget Widget;
  * Widget Draw callback
  * @warning called from GUI thread
  */
-typedef void (*WidgetDrawCallback)(Canvas* api, void* context);
+typedef void (*WidgetDrawCallback)(Canvas* canvas, void* context);
 
 /*
  * Widget Input callback

applications/power/power.c

@@ -1,38 +1,33 @@
 #include "power.h"
+#include "power_views.h"
 
 #include <flipper_v2.h>
 
 #include <menu/menu.h>
 #include <menu/menu_item.h>
+
 #include <gui/gui.h>
 #include <gui/widget.h>
+#include <gui/view.h>
+#include <gui/view_dispatcher.h>
+
 #include <assets_icons.h>
 #include <api-hal-power.h>
 #include <cli/cli.h>
 
 struct Power {
+    ViewDispatcher* view_dispatcher;
+    View* info_view;
+
     Icon* usb_icon;
     Widget* usb_widget;
 
     Icon* battery_icon;
     Widget* battery_widget;
 
-    Widget* widget;
-
     ValueMutex* menu_vm;
     Cli* cli;
     MenuItem* menu;
-
-    float current_charger;
-    float current_gauge;
-    float voltage_charger;
-    float voltage_gauge;
-    uint32_t capacity_remaining;
-    uint32_t capacity_full;
-    float temperature_charger;
-    float temperature_gauge;
-
-    uint8_t charge;
 };
 
 void power_draw_usb_callback(Canvas* canvas, void* context) {
@@ -46,70 +41,31 @@ void power_draw_battery_callback(Canvas* canvas, void* context) {
     Power* power = context;
 
     canvas_draw_icon(canvas, 0, 0, power->battery_icon);
-    canvas_draw_box(canvas, 2, 2, (float)power->charge / 100 * 14, 4);
+    with_view_model(
+        power->info_view, (PowerInfoModel * model) {
+            canvas_draw_box(canvas, 2, 2, (float)model->charge / 100 * 14, 4);
+        });
 }
 
-void power_off_callback(void* context) {
+void power_menu_off_callback(void* context) {
     api_hal_power_off();
 }
 
-void power_enable_otg_callback(void* context) {
+void power_menu_reset_callback(void* context) {
+    NVIC_SystemReset();
+}
+
+void power_menu_enable_otg_callback(void* context) {
     api_hal_power_enable_otg();
 }
 
-void power_disable_otg_callback(void* context) {
+void power_menu_disable_otg_callback(void* context) {
     api_hal_power_disable_otg();
 }
 
-void power_info_callback(void* context) {
+void power_menu_info_callback(void* context) {
     Power* power = context;
-    widget_enabled_set(power->widget, true);
-}
-
-void power_draw_callback(Canvas* canvas, void* context) {
-    Power* power = context;
-
-    canvas_clear(canvas);
-    canvas_set_color(canvas, ColorBlack);
-    canvas_set_font(canvas, FontPrimary);
-    canvas_draw_str(canvas, 2, 10, "Power state:");
-
-    char buffer[64];
-    canvas_set_font(canvas, FontSecondary);
-    snprintf(
-        buffer,
-        64,
-        "Current: %ld/%ldmA",
-        (int32_t)(power->current_gauge * 1000),
-        (int32_t)(power->current_charger * 1000));
-    canvas_draw_str(canvas, 5, 22, buffer);
-    snprintf(
-        buffer,
-        64,
-        "Voltage: %ld/%ldmV",
-        (uint32_t)(power->voltage_gauge * 1000),
-        (uint32_t)(power->voltage_charger * 1000));
-    canvas_draw_str(canvas, 5, 32, buffer);
-    snprintf(buffer, 64, "Charge: %ld%%", (uint32_t)(power->charge));
-    canvas_draw_str(canvas, 5, 42, buffer);
-    snprintf(
-        buffer, 64, "Capacity: %ld of %ldmAh", power->capacity_remaining, power->capacity_full);
-    canvas_draw_str(canvas, 5, 52, buffer);
-    snprintf(
-        buffer,
-        64,
-        "Temperature: %ld/%ldC",
-        (uint32_t)(power->temperature_gauge),
-        (uint32_t)(power->temperature_charger));
-    canvas_draw_str(canvas, 5, 62, buffer);
-}
-
-void power_input_callback(InputEvent* event, void* context) {
-    Power* power = context;
-
-    if(!event->state || event->input != InputBack) return;
-
-    widget_enabled_set(power->widget, false);
+    view_dispatcher_switch_to_view(power->view_dispatcher, PowerViewInfo);
 }
 
 Power* power_alloc() {
@@ -122,26 +78,30 @@ Power* power_alloc() {
 
     power->menu = menu_item_alloc_menu("Power", NULL);
     menu_item_subitem_add(
-        power->menu, menu_item_alloc_function("Poweroff", NULL, power_off_callback, power));
+        power->menu, menu_item_alloc_function("Off", NULL, power_menu_off_callback, power));
+    menu_item_subitem_add(
+        power->menu, menu_item_alloc_function("Reset", NULL, power_menu_reset_callback, power));
     menu_item_subitem_add(
         power->menu,
-        menu_item_alloc_function("Enable OTG", NULL, power_enable_otg_callback, power));
+        menu_item_alloc_function("Enable OTG", NULL, power_menu_enable_otg_callback, power));
     menu_item_subitem_add(
         power->menu,
-        menu_item_alloc_function("Disable OTG", NULL, power_disable_otg_callback, power));
+        menu_item_alloc_function("Disable OTG", NULL, power_menu_disable_otg_callback, power));
     menu_item_subitem_add(
-        power->menu, menu_item_alloc_function("Info", NULL, power_info_callback, power));
+        power->menu, menu_item_alloc_function("Info", NULL, power_menu_info_callback, power));
+
+    power->view_dispatcher = view_dispatcher_alloc();
+    power->info_view = view_alloc();
+    view_allocate_model(power->info_view, ViewModelTypeLockFree, sizeof(PowerInfoModel));
+    view_set_draw_callback(power->info_view, power_info_draw_callback);
+    view_set_previous_callback(power->info_view, power_info_back_callback);
+    view_dispatcher_add_view(power->view_dispatcher, PowerViewInfo, power->info_view);
 
     power->usb_icon = assets_icons_get(I_USBConnected_15x8);
     power->usb_widget = widget_alloc();
     widget_set_width(power->usb_widget, icon_get_width(power->usb_icon));
     widget_draw_callback_set(power->usb_widget, power_draw_usb_callback, power);
 
-    power->widget = widget_alloc();
-    widget_draw_callback_set(power->widget, power_draw_callback, power);
-    widget_input_callback_set(power->widget, power_input_callback, power);
-    widget_enabled_set(power->widget, false);
-
     power->battery_icon = assets_icons_get(I_Battery_19x8);
     power->battery_widget = widget_alloc();
     widget_set_width(power->battery_widget, icon_get_width(power->battery_icon));
@@ -204,9 +164,9 @@ void power_task(void* p) {
     }
 
     Gui* gui = furi_open("gui");
-    gui_add_widget(gui, power->widget, GuiLayerFullscreen);
     gui_add_widget(gui, power->usb_widget, GuiLayerStatusBarLeft);
     gui_add_widget(gui, power->battery_widget, GuiLayerStatusBarRight);
+    view_dispatcher_attach_to_gui(power->view_dispatcher, gui, ViewDispatcherTypeFullscreen);
 
     with_value_mutex(
         power->menu_vm, (Menu * menu) { menu_item_add(menu, power->menu); });
@@ -221,16 +181,22 @@ void power_task(void* p) {
     furiac_ready();
 
     while(1) {
-        power->charge = api_hal_power_get_pct();
-        power->capacity_remaining = api_hal_power_get_battery_remaining_capacity();
-        power->capacity_full = api_hal_power_get_battery_full_capacity();
-        power->current_charger = api_hal_power_get_battery_current(ApiHalPowerICCharger);
-        power->current_gauge = api_hal_power_get_battery_current(ApiHalPowerICFuelGauge);
-        power->voltage_charger = api_hal_power_get_battery_voltage(ApiHalPowerICCharger);
-        power->voltage_gauge = api_hal_power_get_battery_voltage(ApiHalPowerICFuelGauge);
-        power->temperature_charger = api_hal_power_get_battery_temperature(ApiHalPowerICCharger);
-        power->temperature_gauge = api_hal_power_get_battery_temperature(ApiHalPowerICFuelGauge);
-        widget_update(power->widget);
+        with_view_model(
+            power->info_view, (PowerInfoModel * model) {
+                model->charge = api_hal_power_get_pct();
+                model->capacity_remaining = api_hal_power_get_battery_remaining_capacity();
+                model->capacity_full = api_hal_power_get_battery_full_capacity();
+                model->current_charger = api_hal_power_get_battery_current(ApiHalPowerICCharger);
+                model->current_gauge = api_hal_power_get_battery_current(ApiHalPowerICFuelGauge);
+                model->voltage_charger = api_hal_power_get_battery_voltage(ApiHalPowerICCharger);
+                model->voltage_gauge = api_hal_power_get_battery_voltage(ApiHalPowerICFuelGauge);
+                model->temperature_charger =
+                    api_hal_power_get_battery_temperature(ApiHalPowerICCharger);
+                model->temperature_gauge =
+                    api_hal_power_get_battery_temperature(ApiHalPowerICFuelGauge);
+            });
+
+        widget_update(power->battery_widget);
         widget_enabled_set(power->usb_widget, api_hal_power_is_charging());
         osDelay(1000);
     }

applications/power/power_views.c

@@ -0,0 +1,38 @@
+#include "power_views.h"
+
+void power_info_draw_callback(Canvas* canvas, void* context) {
+    PowerInfoModel* data = context;
+
+    canvas_clear(canvas);
+    canvas_set_color(canvas, ColorBlack);
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str(canvas, 2, 10, "Power state:");
+
+    char buffer[64];
+    canvas_set_font(canvas, FontSecondary);
+    snprintf(
+        buffer,
+        64,
+        "Current: %ld/%ldmA",
+        (int32_t)(data->current_gauge * 1000),
+        (int32_t)(data->current_charger * 1000));
+    canvas_draw_str(canvas, 5, 22, buffer);
+    snprintf(
+        buffer,
+        64,
+        "Voltage: %ld/%ldmV",
+        (uint32_t)(data->voltage_gauge * 1000),
+        (uint32_t)(data->voltage_charger * 1000));
+    canvas_draw_str(canvas, 5, 32, buffer);
+    snprintf(buffer, 64, "Charge: %ld%%", (uint32_t)(data->charge));
+    canvas_draw_str(canvas, 5, 42, buffer);
+    snprintf(buffer, 64, "Capacity: %ld of %ldmAh", data->capacity_remaining, data->capacity_full);
+    canvas_draw_str(canvas, 5, 52, buffer);
+    snprintf(
+        buffer,
+        64,
+        "Temperature: %ld/%ldC",
+        (uint32_t)(data->temperature_gauge),
+        (uint32_t)(data->temperature_charger));
+    canvas_draw_str(canvas, 5, 62, buffer);
+}

applications/power/power_views.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <gui/canvas.h>
+#include <flipper_v2.h>
+#include <gui/view.h>
+
+typedef enum { PowerViewInfo } PowerView;
+
+typedef struct {
+    float current_charger;
+    float current_gauge;
+
+    float voltage_charger;
+    float voltage_gauge;
+
+    uint32_t capacity_remaining;
+    uint32_t capacity_full;
+
+    float temperature_charger;
+    float temperature_gauge;
+
+    uint8_t charge;
+} PowerInfoModel;
+
+static uint32_t power_info_back_callback(void* context) {
+    return VIEW_NONE;
+}
+
+void power_info_draw_callback(Canvas* canvas, void* context);

assets/assets.py

@@ -21,7 +21,14 @@ ICONS_TEMPLATE_H_FOOTER = """} IconName;
 Icon * assets_icons_get(IconName name);
 """
 
-ICONS_TEMPLATE_C_HEADER = """#include \"assets_icons.h\"
+ICONS_TEMPLATE_H_I = """#pragma once
+
+#include <assets_icons.h>
+
+const IconData * assets_icons_get_data(IconName name);
+"""
+
+ICONS_TEMPLATE_C_HEADER = """#include \"assets_icons_i.h\"
 #include <gui/icon_i.h>
 
 """
@@ -31,9 +38,12 @@ ICONS_TEMPLATE_C_ICONS_ARRAY_START = "const IconData icons[] = {\n"
 ICONS_TEMPLATE_C_ICONS_ITEM = "\t{{ .width={width}, .height={height}, .frame_count={frame_count}, .frame_rate={frame_rate}, .frames=_{name} }},\n"
 ICONS_TEMPLATE_C_ICONS_ARRAY_END = "};"
 ICONS_TEMPLATE_C_FOOTER = """
+const IconData * assets_icons_get_data(IconName name) {
+    return &icons[name];
+}
 
 Icon * assets_icons_get(IconName name) {
-    return icon_alloc(&icons[name]);
+    return icon_alloc(assets_icons_get_data(name));
 }
 """
 
@@ -157,13 +167,18 @@ class Assets:
         icons_c.write(ICONS_TEMPLATE_C_ICONS_ARRAY_END)
         icons_c.write(ICONS_TEMPLATE_C_FOOTER)
         icons_c.write("\n")
-        # Create Header
+        # Create Public Header
         self.logger.debug(f"Creating header")
         icons_h = open(os.path.join(self.args.output_directory, "assets_icons.h"), "w")
         icons_h.write(ICONS_TEMPLATE_H_HEADER)
         for name, width, height, frame_rate, frame_count in icons:
             icons_h.write(ICONS_TEMPLATE_H_ICON_NAME.format(name=name))
         icons_h.write(ICONS_TEMPLATE_H_FOOTER)
+        # Create Private Header
+        icons_h_i = open(
+            os.path.join(self.args.output_directory, "assets_icons_i.h"), "w"
+        )
+        icons_h_i.write(ICONS_TEMPLATE_H_I)
         self.logger.debug(f"Done")
 
     def icon2header(self, file):

firmware/targets/f4/Src/main.c

@@ -122,6 +122,8 @@ int main(void)
   delay_us_init_DWT();
   api_hal_vcp_init();
   api_hal_spi_init();
+  // Errata 2.2.9, Flash OPTVERR flag is always set after system reset
+  __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);
   /* USER CODE END 2 */
 
   /* Init scheduler */

firmware/targets/f4/api-hal/api-hal-flash.c

@@ -2,14 +2,28 @@
 #include <api-hal-bt.h>
 #include <stm32wbxx.h>
 
-void api_hal_flash_write_dword(size_t address, uint64_t data) {
+bool api_hal_flash_erase(uint8_t page, uint8_t count) {
     api_hal_bt_lock_flash();
-    HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, data);
+    FLASH_EraseInitTypeDef erase;
+    erase.TypeErase = FLASH_TYPEERASE_PAGES;
+    erase.Page = page;
+    erase.NbPages = count;
+    uint32_t error;
+    HAL_StatusTypeDef status = HAL_FLASHEx_Erase(&erase, &error);
     api_hal_bt_unlock_flash();
+    return status == HAL_OK;
 }
 
-void api_hal_flash_write_row(size_t address, size_t source_address) {
+bool api_hal_flash_write_dword(size_t address, uint64_t data) {
     api_hal_bt_lock_flash();
-    HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, source_address);
+    HAL_StatusTypeDef status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, data);
     api_hal_bt_unlock_flash();
+    return status == HAL_OK;
+}
+
+bool api_hal_flash_write_row(size_t address, size_t source_address) {
+    api_hal_bt_lock_flash();
+    HAL_StatusTypeDef status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_FAST, address, source_address);
+    api_hal_bt_unlock_flash();
+    return status == HAL_OK;
 }

firmware/targets/f4/api-hal/api-hal-flash.h

@@ -1,15 +1,24 @@
 #pragma once
 
+#include <stdbool.h>
 #include <stdint.h>
 #include <stddef.h>
 
+/*
+ * Erase Flash
+ * Locking operation, uses HSEM to manage shared access.
+ * @param page, page number
+ * @param count, page count to erase
+ */
+bool api_hal_flash_erase(uint8_t page, uint8_t count);
+
 /*
  * Write double word (64 bits)
  * Locking operation, uses HSEM to manage shared access.
  * @param address - destination address, must be double word aligned.
  * @param data - data to write
  */
-void api_hal_flash_write_dword(size_t address, uint64_t data);
+bool api_hal_flash_write_dword(size_t address, uint64_t data);
 
 /*
  * Write page (4096 bytes or 64 rows of double words).
@@ -17,4 +26,4 @@ void api_hal_flash_write_dword(size_t address, uint64_t data);
  * @param address - destination address, must be page aligned
  * @param source_address - source address
  */
-void api_hal_flash_write_page(size_t address, size_t source_address);
+bool api_hal_flash_write_page(size_t address, size_t source_address);

make/rules.mk

@@ -62,7 +62,7 @@ $(OBJ_DIR)/upload: $(OBJ_DIR)/$(PROJECT).bin
 	dfu-util -D $(OBJ_DIR)/$(PROJECT).bin -a 0 -s $(FLASH_ADDRESS) -S $(DFU_SERIAL)
 	touch $@
 
-$(ASSETS): $(ASSETS_SOURCES)
+$(ASSETS): $(ASSETS_SOURCES) $(ASSETS_COMPILLER)
 	@echo "\tASSETS\t" $@
 	@$(ASSETS_COMPILLER) icons -s $(ASSETS_SOURCE_DIR) -o $(ASSETS_OUTPUT_DIR)