initial

README.md

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+# T5577 Writer App
+
+
+

application.fam

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+App(
+    appid="t5577_writer",
+    name="T5577 Writer",
+    apptype=FlipperAppType.EXTERNAL,
+    entry_point="main_t5577_writer_app",
+    stack_size=4 * 1024,
+    requires=[
+        "gui",
+    ],
+    order=4,
+    fap_icon="icon.png",
+    fap_category="RFID",
+    fap_icon_assets="assets",
+    fap_description="@README.md",
+    fap_version="0.1",
+    fap_author="Torron"
+)

progress.c

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+#include <furi.h>
+#include <furi_hal.h>
+#include <gui/gui.h>
+#include <gui/view.h>
+#include <gui/view_dispatcher.h>
+#include <gui/modules/byte_input.h>
+#include <gui/modules/popup.h>
+#include <gui/modules/submenu.h>
+#include <gui/modules/text_input.h>
+#include <gui/modules/widget.h>
+#include <gui/modules/variable_item_list.h>
+#include <notification/notification.h>
+#include <notification/notification_messages.h>
+#include "t5577_writer_icons.h"
+#include <applications/services/storage/storage.h>
+#include <applications/services/dialogs/dialogs.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <t5577_config.h>
+#include <t5577_writer.h>
+
+#define TAG "T5577 Writer"
+
+// Change this to BACKLIGHT_AUTO if you don't want the backlight to be continuously on.
+#define BACKLIGHT_AUTO 1
+
+// Our application menu has 3 items.  You can add more items if you want.
+typedef enum {
+    T5577WriterSubmenuIndexLoad,
+    T5577WriterSubmenuIndexSave,
+    T5577WriterSubmenuIndexConfigure,
+    T5577WriterSubmenuIndexWrite,
+    T5577WriterSubmenuIndexAbout,
+} T5577WriterSubmenuIndex;
+
+// Each view is a screen we show the user.
+typedef enum {
+    T5577WriterViewSubmenu, // The menu when the app starts
+    T5577WriterViewTextInput, // Input for configuring text settings
+    T5577WriterViewByteInput,
+    T5577WriterViewLoad,
+    T5577WriterViewSave,
+    T5577WriterViewConfigure_i, // The configuration screen
+    T5577WriterViewConfigure_e, // The configuration screen
+    T5577WriterViewWrite, // The main screen
+    T5577WriterViewAbout, // The about screen with directions, link to social channel, etc.
+} T5577WriterView;
+
+typedef enum {
+    T5577WriterEventIdRedrawScreen = 0, // Custom event to redraw the screen
+    T5577WriterEventIdOkPressed = 42, // Custom event to process OK button getting pressed down
+} T5577WriterEventId;
+
+typedef struct {
+    ViewDispatcher* view_dispatcher; // Switches between our views
+    NotificationApp* notifications; // Used for controlling the backlight
+    Submenu* submenu; // The application menu
+
+    TextInput* text_input; // The text input screen
+    VariableItemList* variable_item_list_config; // The configuration screen
+    View* view_config_e; // The configuration screen
+    View* view_save; 
+    View* view_write; // The main screen
+    Widget* widget_about; // The about screen
+    View* view_load; // The load view
+
+    VariableItem* mod_item; // 
+    VariableItem* clock_item; //
+    VariableItem* block_num_item; // 
+    VariableItem* block_slc_item; //
+    VariableItem* byte_buffer_item; //
+    ByteInput* byte_input; // The byte input view
+    uint8_t* bytes_buffer[4];
+    uint8_t bytes_count;
+
+    char* temp_buffer; // Temporary buffer for text input
+    uint32_t temp_buffer_size; // Size of temporary buffer
+    
+    DialogsApp* dialogs;
+    FuriString* file_path;
+    FuriTimer* timer; // Timer for redrawing the screen
+    ViewNavigationCallback config_enter_callback;
+} T5577WriterApp;
+
+
+typedef struct {
+    uint8_t modulation_index; // The index for total number of pins
+    uint8_t rf_clock_index; // The index for total number of pins
+    FuriString* tag_name_str; // The name setting
+    uint8_t user_block_num; // The total number of pins we are adjusting
+    uint32_t* content; // The cutting content
+    t5577_modulation modulation;
+    t5577_rf_clock rf_clock;
+    bool data_loaded[3];
+    uint8_t edit_block_slc;
+} T5577WriterModel;
+
+static inline int min(int a, int b) {
+    return (a < b) ? a : b;
+}
+
+static inline int max(int a, int b) {
+    return (a > b) ? a : b;
+}
+
+void initialize_config(T5577WriterModel* model) {
+    model->modulation_index = 0;
+    memcpy(&model->modulation, &all_mods[model->modulation_index], sizeof(t5577_modulation));
+    model->rf_clock_index = 0;
+    memcpy(&model->rf_clock, &all_mods[model->rf_clock_index], sizeof(t5577_rf_clock));
+}
+
+void initialize_model(T5577WriterModel* model) {
+    if(model->content != NULL) {
+        free(model->content);
+    }
+    initialize_config(model);
+    model->user_block_num = 1;
+    model->edit_block_slc = 1;
+    model->content = (uint32_t*)malloc(LFRFID_T5577_BLOCK_COUNT * sizeof(uint32_t));
+    for(uint32_t i = 0; i < LFRFID_T5577_BLOCK_COUNT; i++) {
+        model->content[i] = 0;
+    }
+    memset(model->data_loaded, false, sizeof(model->data_loaded));
+}
+
+uint8_t rf_clock_choices[COUNT_OF(all_rf_clocks)];
+void initialize_rf_clock_choices(uint8_t* rf_clock_choices) {
+    // Populate the rf_clock_choices array
+    for (size_t i = 0; i < COUNT_OF(all_rf_clocks); i++) {
+        rf_clock_choices[i] = all_rf_clocks[i].rf_clock_num;
+    }
+}
+
+char* modulation_names[COUNT_OF(all_mods)];
+void initialize_mod_names(char** modulation_names) {
+    // Populate the modulation_names array
+    for (size_t i = 0; i < COUNT_OF(all_mods); i++) {
+        modulation_names[i] = all_mods[i].modulation_name;
+    }
+}
+
+/**
+ * @brief      Callback for exiting the application.
+ * @details    This function is called when user press back button.  We return VIEW_NONE to
+ *            indicate that we want to exit the application.
+ * @param      _context  The context - unused
+ * @return     next view id
+*/
+static uint32_t t5577_writer_navigation_exit_callback(void* _context) {
+    UNUSED(_context);
+    return VIEW_NONE;
+}
+
+/**
+ * @brief      Callback for returning to submenu.
+ * @details    This function is called when user press back button.  We return VIEW_NONE to
+ *            indicate that we want to navigate to the submenu.
+ * @param      _context  The context - unused
+ * @return     next view id
+*/
+static uint32_t t5577_writer_navigation_submenu_callback(void* _context) {
+    UNUSED(_context);
+    return T5577WriterViewSubmenu;
+}
+
+
+/**
+ * @brief      Callback for returning to configure screen.
+ * @details    This function is called when user press back button.  We return VIEW_NONE to
+ *            indicate that we want to navigate to the configure screen.
+ * @param      _context  The context - unused
+ * @return     next view id
+*/
+//static uint32_t t5577_writer_navigation_configure_callback(void* _context) {
+//    UNUSED(_context);
+//    return T5577WriterViewConfigure_i;
+//}
+
+static uint32_t t5577_writer_navigation_file_callback(void* _context) {
+    UNUSED(_context);
+    return T5577WriterViewSubmenu;
+}
+
+/**
+ * @brief      Handle submenu item selection.
+ * @details    This function is called when user selects an item from the submenu.
+ * @param      context  The context - T5577WriterApp object.
+ * @param      index     The T5577WriterSubmenuIndex item that was clicked.
+*/
+static void t5577_writer_submenu_callback(void* context, uint32_t index) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    switch(index) {
+    case T5577WriterSubmenuIndexLoad:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewLoad);
+        break;
+    case T5577WriterSubmenuIndexSave:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSave);
+        break;
+    case T5577WriterSubmenuIndexConfigure:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewConfigure_e);
+        break;
+    case T5577WriterSubmenuIndexWrite:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewWrite);
+        break;
+    case T5577WriterSubmenuIndexAbout:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewAbout);
+        break;
+    default:
+        break;
+    }
+}
+
+/**
+ * Our 1st sample setting is a team color.  We have 3 options: red, green, and blue.
+*/
+static const char* modulation_config_label = "Modulation";
+//static char* modulation_names[] = {"Direct", "PSK1", "PSK2", "PSK3", "FSK1", "FSK2", "FSK1a", "FSK2a","ASK/Man","Biphase","Diphase"};
+static void t5577_writer_modulation_change(VariableItem* item) {
+    T5577WriterApp* app = variable_item_get_context(item);
+    FURI_LOG_D(TAG,"app defined");
+    T5577WriterModel* model = view_get_model(app->view_write);
+    FURI_LOG_D(TAG,"model defined");
+    if (model->data_loaded[0]) {
+        FURI_LOG_D(TAG,"loaded entered");
+        variable_item_set_current_value_index(item,model->modulation_index);
+    } else{
+        FURI_LOG_D(TAG,"else entered");
+        uint8_t modulation_index = variable_item_get_current_value_index(item);
+        model->modulation_index = modulation_index;
+        model->modulation = all_mods[modulation_index];
+    }
+    model->data_loaded[0] = false;
+    variable_item_set_current_value_text(item, modulation_names[model->modulation_index]);
+}
+
+static const char* rf_clock_config_label = "RF Clock";
+static void t5577_writer_rf_clock_change(VariableItem* item) {
+    T5577WriterApp* app = variable_item_get_context(item);
+    T5577WriterModel* model = view_get_model(app->view_write);
+
+    if (model->data_loaded[1]) {
+        variable_item_set_current_value_index(item,model->rf_clock_index);
+    } else{
+        uint8_t rf_clock_index = variable_item_get_current_value_index(item);
+        model->rf_clock_index = rf_clock_index;
+        model->rf_clock = all_rf_clocks[rf_clock_index];
+        
+    }
+    model->data_loaded[1] = false;
+    FuriString *buffer = furi_string_alloc();
+    furi_string_printf(buffer, "%u", rf_clock_choices[model->rf_clock_index]);
+    variable_item_set_current_value_text(item, furi_string_get_cstr(buffer));
+    furi_string_free(buffer);
+}
+
+static const char* user_block_num_config_label = "Num of Blocks";
+static void t5577_writer_user_block_num_change(VariableItem* item) {
+    T5577WriterApp* app = variable_item_get_context(item);
+    T5577WriterModel* model = view_get_model(app->view_write);
+    if (model->data_loaded[2]) {
+        variable_item_set_current_value_index(item,model->user_block_num - 1);
+    } else {
+        uint8_t user_block_num_index = variable_item_get_current_value_index(item);
+        model->user_block_num = user_block_num_index + 1;
+    }
+    model->data_loaded[2] = false;
+    FuriString *buffer = furi_string_alloc();
+    furi_string_printf(buffer, "%u", model->user_block_num);
+    variable_item_set_current_value_text(item, furi_string_get_cstr(buffer));
+    for(uint8_t i = model->user_block_num; i < LFRFID_T5577_BLOCK_COUNT; i++) {
+        model->content[i] = 0;
+    }
+    furi_string_free(buffer);
+}
+
+static const char* edit_block_slc_config_label = "Edit Block";
+static void t5577_writer_edit_block_slc_change(VariableItem* item) {
+    T5577WriterApp* app = variable_item_get_context(item);
+    T5577WriterModel* model = view_get_model(app->view_write);
+    uint8_t edit_block_slc_index = variable_item_get_current_value_index(item);
+    model->edit_block_slc = edit_block_slc_index + 1;
+    variable_item_set_current_value_index(item,model->edit_block_slc - 1);
+    FuriString *buffer = furi_string_alloc();
+    furi_string_printf(buffer, "%u", model->edit_block_slc);
+    variable_item_set_current_value_text(item, furi_string_get_cstr(buffer));
+    furi_string_free(buffer);
+}
+
+static const char* edit_block_data_config_label = "Block Data";
+
+void ensure_dir_exists(Storage *storage)
+{
+    // If apps_data directory doesn't exist, create it.
+    if (!storage_dir_exists(storage, T5577_WRITER_APPS_DATA_FOLDER))
+    {
+        FURI_LOG_I(TAG, "Creating directory: %s", T5577_WRITER_APPS_DATA_FOLDER);
+        storage_simply_mkdir(storage, T5577_WRITER_APPS_DATA_FOLDER);
+    }
+    else
+    {
+        FURI_LOG_I(TAG, "Directory exists: %s", T5577_WRITER_APPS_DATA_FOLDER);
+    }
+
+    // If wiegand directory doesn't exist, create it.
+    if (!storage_dir_exists(storage, T5577_WRITER_FILE_FOLDER))
+    {
+        FURI_LOG_I(TAG, "Creating directory: %s", T5577_WRITER_FILE_FOLDER);
+        storage_simply_mkdir(storage, T5577_WRITER_FILE_FOLDER);
+    }
+    else
+    {
+        FURI_LOG_I(TAG, "Directory exists: %s", T5577_WRITER_FILE_FOLDER);
+    }
+}
+/**
+ * Our 2nd sample setting is a text field.  When the user clicks OK on the configuration 
+ * setting we use a text input screen to allow the user to enter a name.  This function is
+ * called when the user clicks OK on the text input screen.
+*/
+static const char* tag_name_entry_text = "Enter name";
+static const char* tag_name_default_value = "Tag_1";
+static void t5577_writer_file_saver(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* model = view_get_model(app->view_write);
+    model->content[0] = 0;
+    model->content[0] |= model->modulation.mod_page_zero;
+    model->content[0] |= model->rf_clock.clock_page_zero;
+    model->content[0] |= (model->user_block_num << LFRFID_T5577_MAXBLOCK_SHIFT);
+    bool redraw = true;
+    with_view_model(
+        app->view_write,
+        T5577WriterModel * model,
+        {
+            furi_string_set(model->tag_name_str, app->temp_buffer);
+        },
+        redraw);
+    FuriString *buffer = furi_string_alloc();
+    FuriString *file_path = furi_string_alloc();
+    furi_string_printf(
+        file_path, "%s/%s%s", T5577_WRITER_FILE_FOLDER, furi_string_get_cstr(model->tag_name_str), T5577_WRITER_FILE_EXTENSION);
+
+    Storage *storage = furi_record_open(RECORD_STORAGE);
+    ensure_dir_exists(storage);
+    File *data_file = storage_file_alloc(storage);
+    if (storage_file_open(
+            data_file, furi_string_get_cstr(file_path), FSAM_WRITE, FSOM_OPEN_ALWAYS))
+    {
+        furi_string_printf(buffer, "Filetype: Flipper T5577 Raw File\n");
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "Version: 1.0\n");
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "Modulation: %s\n", model->modulation.modulation_name);
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "RF Clock: %u\n", model->rf_clock.rf_clock_num);
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "Number of User Blocks: %u\n", model->user_block_num);
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "\nRaw Data:\n");
+        for (int i = 0; i < model->user_block_num; i++)
+        {   
+            furi_string_cat_printf(
+                buffer,
+                "Block %u: %08lX\n",
+                i,
+                model->content[i]);
+        
+        }
+        furi_string_push_back(buffer, '\n');
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        storage_file_close(data_file);
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSubmenu);
+    }
+}
+
+void t5577_writer_update_config_from_load(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* my_model = view_get_model(app->view_write);
+
+    
+    for (size_t i = 0; i < COUNT_OF(all_mods); i++) {
+        if ((my_model->content[0] & all_mods[i].mod_page_zero) == all_mods[i].mod_page_zero) {
+            my_model->modulation_index = (uint8_t)i;
+            my_model->modulation = all_mods[my_model->modulation_index];
+        }
+    }
+
+    for (size_t i = 0; i < COUNT_OF(all_rf_clocks); i++) {
+        if ((my_model->content[0] & all_rf_clocks[i].clock_page_zero) == all_rf_clocks[i].clock_page_zero) {
+            my_model->rf_clock_index = (uint8_t)i;
+            my_model->rf_clock = all_rf_clocks[my_model->rf_clock_index];
+        }
+    }
+
+    my_model->user_block_num = (my_model->content[0] >> LFRFID_T5577_MAXBLOCK_SHIFT) & 0x7;
+
+    memset(my_model->data_loaded, true, sizeof(my_model->data_loaded));
+
+}
+
+void uint32_to_byte_buffer(uint32_t block_data, uint8_t* byte_buffer[4]) {
+    byte_buffer[0] = (block_data >> 24) & 0xFF;
+    byte_buffer[1] = (block_data >> 16) & 0xFF;
+    byte_buffer[2] = (block_data >> 8) & 0xFF;
+    byte_buffer[3] = block_data & 0xFF;
+}
+
+uint32_t byte_buffer_to_uint32(const uint8_t** byte_buffer[4]) {
+    return ((uint32_t)(**byte_buffer[0] << 24)) ;
+}
+
+static void t5577_writer_content_byte_input_confirmed(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* my_model = view_get_model(app->view_write);
+    my_model->content[my_model->edit_block_slc] = byte_buffer_to_uint32(app->bytes_buffer);
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewConfigure_e);
+}
+
+static void t5577_writer_content_byte_changed(void* context) {
+    UNUSED(context);
+}
+
+static void t5577_writer_config_item_clicked(void* context, uint32_t index) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* my_model = view_get_model(app->view_write);
+    FuriString *buffer = furi_string_alloc();
+    furi_string_printf(buffer, "Enter Block %u Data", my_model->edit_block_slc);
+    // Our hex input UI is the 5th in the config menue.
+    if(index == 4) {
+        // Header to display on the text input screen.
+        byte_input_set_header_text(app->byte_input, furi_string_get_cstr(buffer));
+
+        // Copy the current name into the temporary buffer.
+        bool redraw = false;
+        with_view_model(
+            app->view_write,
+            T5577WriterModel * model,
+            {
+                uint32_to_byte_buffer(model->content[model->edit_block_slc],app->bytes_buffer);
+            },
+            redraw);
+
+        // Configure the text input.  When user enters text and clicks OK, key_copier_setting_text_updated be called.
+        byte_input_set_result_callback(
+            app->byte_input,
+            t5577_writer_content_byte_input_confirmed,
+            t5577_writer_content_byte_changed,
+            app,
+            app->bytes_buffer,
+            app->bytes_count
+            );
+
+        // Pressing the BACK button will reload the configure screen.
+        view_set_previous_callback(byte_input_get_view(app->byte_input), app->config_enter_callback);
+
+        // Show text input dialog.
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewByteInput);
+    }
+}
+
+static void t5577_writer_config_enter_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* my_model = view_get_model(app->view_write);
+    variable_item_list_reset(app->variable_item_list_config);
+    app->mod_item = variable_item_list_add(
+        app->variable_item_list_config,
+        modulation_config_label,
+        COUNT_OF(modulation_names),
+        t5577_writer_modulation_change,
+        app);
+    app->clock_item = variable_item_list_add(
+        app->variable_item_list_config,
+        rf_clock_config_label,
+        COUNT_OF(rf_clock_choices),
+        t5577_writer_rf_clock_change,
+        app);
+    app->block_num_item = variable_item_list_add(
+        app->variable_item_list_config,
+        user_block_num_config_label,
+        LFRFID_T5577_BLOCK_COUNT,
+        t5577_writer_user_block_num_change,
+        app);
+    app->block_slc_item = variable_item_list_add(
+        app->variable_item_list_config,
+        edit_block_slc_config_label,
+        LFRFID_T5577_BLOCK_COUNT - 1,
+        t5577_writer_edit_block_slc_change,
+        app);
+    app->byte_buffer_item = variable_item_list_add(
+        app->variable_item_list_config, edit_block_data_config_label, 1, NULL, NULL);
+
+    FuriString *buffer = furi_string_alloc();
+    furi_string_printf(buffer, "%08lX", my_model->content[my_model->edit_block_slc]);
+    variable_item_set_current_value_text(
+        app->byte_buffer_item, furi_string_get_cstr(buffer));
+
+    View* view_config_i = variable_item_list_get_view(app->variable_item_list_config);
+    t5577_writer_modulation_change(app->mod_item);
+    t5577_writer_rf_clock_change(app->clock_item);
+    t5577_writer_user_block_num_change(app->block_num_item);
+    t5577_writer_edit_block_slc_change(app->block_slc_item);
+    view_set_previous_callback(
+        view_config_i,
+        t5577_writer_navigation_submenu_callback);
+    variable_item_list_set_enter_callback(
+        app->variable_item_list_config, t5577_writer_config_item_clicked, app);
+
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewConfigure_i);
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewConfigure_i,
+        view_config_i);
+    view_dispatcher_switch_to_view(app->view_dispatcher,T5577WriterViewConfigure_i);
+    FURI_LOG_D(TAG,"enter_callback_finished");
+}
+
+void t5577_writer_view_load_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* model = view_get_model(app->view_write);
+    DialogsFileBrowserOptions browser_options;
+    Storage* storage = furi_record_open(RECORD_STORAGE);
+    ensure_dir_exists(storage);
+    File* data_file = storage_file_alloc(storage);
+    dialog_file_browser_set_basic_options(&browser_options, T5577_WRITER_FILE_EXTENSION, NULL);
+    browser_options.base_path = T5577_WRITER_FILE_FOLDER;
+    furi_string_set(app->file_path, browser_options.base_path);
+    FuriString* buffer = furi_string_alloc();
+
+    if(dialog_file_browser_show(app->dialogs, app->file_path, app->file_path, &browser_options)) {
+        
+        if(storage_file_open(
+               data_file, furi_string_get_cstr(app->file_path), FSAM_READ, FSOM_OPEN_EXISTING)) {
+            while(!storage_file_eof(data_file)) { // fill buffer with every line because ch == '\n'
+                char ch;
+                furi_string_reset(buffer);
+                while(storage_file_read(data_file, &ch, 1) && !storage_file_eof(data_file)) {
+                    furi_string_push_back(buffer, ch);
+                    if(ch == '\n') {
+                        break;
+                    }
+                }
+                if(furi_string_start_with(buffer, "Block ")) {
+                    uint32_t row_data_buffer = 0;
+                    char row_data_char_buffer[] = "00000000";
+                    uint32_t row_num_buffer = 0;
+                    char row_num_char_buffer[] = "0";
+                    int length = furi_string_size(buffer);
+                    char ch;
+                    int i = 0;
+                    while(i < length) {
+                        if(furi_string_get_char(buffer, i) == ':') {
+                            row_num_char_buffer[0] = furi_string_get_char(buffer, i - 1); //the number before ":" is block num
+                            i += 2; // skip a space
+                            for(size_t j = 0; j < sizeof(row_data_char_buffer); j++) {
+                                ch = furi_string_get_char(buffer, i);
+                                row_data_char_buffer[j] = ch;
+                                i++;
+                            }
+                            break;
+                        }
+                        i++;
+                    }
+                    sscanf(row_num_char_buffer, "%lx", &row_num_buffer);
+                    sscanf(row_data_char_buffer, "%lx", &row_data_buffer);
+                    model->content[row_num_buffer] = row_data_buffer;
+                }
+            }
+            storage_file_close(data_file);
+            t5577_writer_update_config_from_load(app);
+        }
+        storage_file_free(data_file);
+        furi_record_close(RECORD_STORAGE);
+    }
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSubmenu);
+}
+
+
+/**
+ * @brief      Callback when item in configuration screen is clicked.
+ * @details    This function is called when user clicks OK on an item in the configuration screen.
+ *            If the item clicked is our text field then we switch to the text input screen.
+ * @param      context  The context - T5577WriterApp object.
+ * @param      index - The index of the item that was clicked.
+*/
+static void t5577_writer_view_save_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    // Header to display on the text input screen.
+    text_input_set_header_text(app->text_input, tag_name_entry_text);
+    // Copy the current name into the temporary buffer.
+    bool redraw = false;
+    with_view_model(
+        app->view_write,
+        T5577WriterModel * model,
+        {
+            strncpy(
+                app->temp_buffer,
+                furi_string_get_cstr(model->tag_name_str),
+                app->temp_buffer_size);
+        },
+        redraw);
+    // Configure the text input.  When user enters text and clicks OK, t5577_writer_setting_text_updated be called.
+    bool clear_previous_text = false;
+    text_input_set_result_callback(
+        app->text_input,
+        t5577_writer_file_saver,
+        app,
+        app->temp_buffer,
+        app->temp_buffer_size,
+        clear_previous_text);
+    // Pressing the BACK button will reload the configure screen.
+    view_set_previous_callback(
+        text_input_get_view(app->text_input), t5577_writer_navigation_file_callback);
+
+    // Show text input dialog.
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewTextInput);
+    
+}
+
+/**
+ * @brief      Callback for drawing the game screen.
+ * @details    This function is called when the screen needs to be redrawn, like when the model gets updated.
+ * @param      canvas  The canvas to draw on.
+ * @param      model   The model - MyModel object.
+*/
+static void t5577_writer_view_write_callback(Canvas* canvas, void* model) {
+    T5577WriterModel* my_model = (T5577WriterModel*)model;
+    my_model->content[0] = 0;
+    my_model->content[0] |= my_model->modulation.mod_page_zero;
+    my_model->content[0] |= my_model->rf_clock.clock_page_zero;
+    my_model->content[0] |= (my_model->user_block_num << LFRFID_T5577_MAXBLOCK_SHIFT);
+
+    LFRFIDT5577* data = (LFRFIDT5577*)malloc(sizeof(LFRFIDT5577));
+    data->blocks_to_write = my_model->user_block_num;
+    for(size_t i = 0; i < data->blocks_to_write; i++) {
+        data->block[i] = my_model->content[i];
+    }
+    data->block[1] = 0x007F9FB6;
+    data->block[2] = 0xB59FD7F9;
+    data->block[3] = 0x006BDFAE;
+    data->block[4] = 0xACB83B53;
+    t5577_write(data);
+    free(data);
+
+    canvas_draw_line(canvas, 0, 25, 120, 50);
+}
+
+/**
+ * @brief      Callback for timer elapsed.
+ * @details    This function is called when the timer is elapsed.  We use this to queue a redraw event.
+ * @param      context  The context - T5577WriterApp object.
+*/
+static void t5577_writer_view_write_timer_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, T5577WriterEventIdRedrawScreen);
+}
+
+/**
+ * @brief      Callback when the user starts the game screen.
+ * @details    This function is called when the user enters the game screen.  We start a timer to
+ *           redraw the screen periodically (so the random number is refreshed).
+ * @param      context  The context - T5577WriterApp object.
+*/
+static void t5577_writer_view_write_enter_callback(void* context) {
+    uint32_t period = furi_ms_to_ticks(500);
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    furi_assert(app->timer == NULL);
+    app->timer =
+        furi_timer_alloc(t5577_writer_view_write_timer_callback, FuriTimerTypePeriodic, context);
+    furi_timer_start(app->timer, period);
+}
+
+/**
+ * @brief      Callback when the user exits the game screen.
+ * @details    This function is called when the user exits the game screen.  We stop the timer.
+ * @param      context  The context - T5577WriterApp object.
+*/
+static void t5577_writer_view_write_exit_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    furi_timer_stop(app->timer);
+    furi_timer_free(app->timer);
+    app->timer = NULL;
+}
+
+/**
+ * @brief      Callback for custom events.
+ * @details    This function is called when a custom event is sent to the view dispatcher.
+ * @param      event    The event id - T5577WriterEventId value.
+ * @param      context  The context - T5577WriterApp object.
+*/
+static bool t5577_writer_view_write_custom_event_callback(uint32_t event, void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    switch(event) {
+    case T5577WriterEventIdRedrawScreen:
+        // Redraw screen by passing true to last parameter of with_view_model.
+        {
+            bool redraw = true;
+            with_view_model(
+                app->view_write, T5577WriterModel * _model, { UNUSED(_model); }, redraw);
+            return true;
+        }
+    case T5577WriterEventIdOkPressed:
+        // Process the OK button.  We go to the saving scene.
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSubmenu);
+        return true;
+    default:
+        return false;
+    }
+}
+
+/**
+ * @brief      Callback for game screen input.
+ * @details    This function is called when the user presses a button while on the game screen.
+ * @param      event    The event - InputEvent object.
+ * @param      context  The context - T5577WriterApp object.
+ * @return     true if the event was handled, false otherwise.
+*/
+static bool t5577_writer_view_write_input_callback(InputEvent* event, void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    if(event->type == InputTypeShort) {
+        if(event->key == InputKeyOk) {
+        // We choose to send a custom event when user presses OK button.  t5577_writer_custom_event_callback will
+        // handle our T5577WriterEventIdOkPressed event.  We could have just put the code from
+        // t5577_writer_custom_event_callback here, it's a matter of preference.
+        view_dispatcher_send_custom_event(app->view_dispatcher, T5577WriterEventIdOkPressed);
+        return true;
+        }
+    }
+    return false;
+}
+
+/**
+ * @brief      Allocate the t5577_writer application.
+ * @details    This function allocates the t5577_writer application resources.
+ * @return     T5577WriterApp object.
+*/
+static T5577WriterApp* t5577_writer_app_alloc() {
+    T5577WriterApp* app = (T5577WriterApp*)malloc(sizeof(T5577WriterApp));
+
+    Gui* gui = furi_record_open(RECORD_GUI);
+
+    app->view_dispatcher = view_dispatcher_alloc();
+    app->dialogs = furi_record_open(RECORD_DIALOGS);
+    app->file_path = furi_string_alloc();
+    view_dispatcher_enable_queue(app->view_dispatcher);
+    view_dispatcher_attach_to_gui(app->view_dispatcher, gui, ViewDispatcherTypeFullscreen);
+    view_dispatcher_set_event_callback_context(app->view_dispatcher, app);
+    app->submenu = submenu_alloc();
+    submenu_add_item(
+        app->submenu, "Write", T5577WriterSubmenuIndexWrite, t5577_writer_submenu_callback, app);
+    submenu_add_item(
+        app->submenu, "Config", T5577WriterSubmenuIndexConfigure, t5577_writer_submenu_callback, app);
+    submenu_add_item(
+        app->submenu, "Save", T5577WriterSubmenuIndexSave, t5577_writer_submenu_callback, app);
+    submenu_add_item(
+        app->submenu, "Load", T5577WriterSubmenuIndexLoad, t5577_writer_submenu_callback, app);
+    submenu_add_item(
+        app->submenu, "About", T5577WriterSubmenuIndexAbout, t5577_writer_submenu_callback, app);
+    view_set_previous_callback(submenu_get_view(app->submenu), t5577_writer_navigation_exit_callback);
+    view_dispatcher_add_view(
+        app->view_dispatcher, T5577WriterViewSubmenu, submenu_get_view(app->submenu));
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSubmenu);
+
+    app->text_input = text_input_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, T5577WriterViewTextInput, text_input_get_view(app->text_input));
+
+
+    app->view_load = view_alloc();
+    view_set_previous_callback(app->view_load, t5577_writer_navigation_submenu_callback);
+    view_set_enter_callback(app->view_load, t5577_writer_view_load_callback);
+    view_set_context(app->view_load, app);
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewLoad,
+        app->view_load);
+
+    app->temp_buffer_size = 32;
+    app->temp_buffer = (char*)malloc(app->temp_buffer_size);
+
+    app->bytes_count = 4;
+    memset(app->bytes_buffer, 0, sizeof(app->bytes_buffer));
+    
+    app->byte_input = byte_input_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, T5577WriterViewByteInput, byte_input_get_view(app->byte_input));
+
+    app->variable_item_list_config = variable_item_list_alloc();
+
+
+    app->view_write = view_alloc();
+    view_set_draw_callback(app->view_write, t5577_writer_view_write_callback);
+    view_set_input_callback(app->view_write, t5577_writer_view_write_input_callback);
+    view_set_previous_callback(app->view_write, t5577_writer_navigation_submenu_callback);
+    view_set_enter_callback(app->view_write, t5577_writer_view_write_enter_callback);
+    view_set_exit_callback(app->view_write, t5577_writer_view_write_exit_callback);
+    view_set_context(app->view_write, app);
+    view_set_custom_callback(app->view_write, t5577_writer_view_write_custom_event_callback);
+    view_allocate_model(app->view_write, ViewModelTypeLockFree, sizeof(T5577WriterModel));
+    view_dispatcher_add_view(app->view_dispatcher, T5577WriterViewWrite, app->view_write);
+
+    T5577WriterModel* model = view_get_model(app->view_write); // initialize model
+
+    FuriString* tag_name_str = furi_string_alloc();
+    furi_string_set_str(tag_name_str, tag_name_default_value);
+    
+    model->tag_name_str = tag_name_str;
+    initialize_model(model);
+    initialize_rf_clock_choices(rf_clock_choices);
+    initialize_mod_names(modulation_names);
+
+    app->view_save = view_alloc();
+    view_set_previous_callback(app->view_save, t5577_writer_navigation_submenu_callback);
+    view_set_enter_callback(app->view_save, t5577_writer_view_save_callback);
+    view_set_context(app->view_save, app);
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewSave,
+        app->view_save);
+
+
+    app->variable_item_list_config = variable_item_list_alloc();
+    app->config_enter_callback = t5577_writer_config_enter_callback;
+    app->view_config_e = view_alloc();
+    view_set_previous_callback(
+        app->view_config_e,
+        t5577_writer_navigation_submenu_callback);
+    view_set_enter_callback(app->view_config_e, t5577_writer_config_enter_callback);
+    view_set_context(app->view_config_e, app);
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewConfigure_e,
+        app->view_config_e);
+        
+    View* view_buffer = view_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewConfigure_i,
+        view_buffer);
+    
+
+    app->widget_about = widget_alloc();
+    widget_add_text_scroll_element(
+        app->widget_about,
+        0,
+        0,
+        128,
+        64,
+        "T5577 Writer v0.1");
+    view_set_previous_callback(
+        widget_get_view(app->widget_about), t5577_writer_navigation_submenu_callback);
+    view_dispatcher_add_view(
+        app->view_dispatcher, T5577WriterViewAbout, widget_get_view(app->widget_about));
+
+    app->notifications = furi_record_open(RECORD_NOTIFICATION);
+
+#ifdef BACKLIGHT_ON
+    notification_message(app->notifications, &sequence_display_backlight_enforce_on);
+#endif
+
+    return app;
+}
+
+/**
+ * @brief      Free the t5577_writer application.
+ * @details    This function frees the t5577_writer application resources.
+ * @param      app  The t5577_writer application object.
+*/
+static void t5577_writer_app_free(T5577WriterApp* app) {
+#ifdef BACKLIGHT_ON
+    notification_message(app->notifications, &sequence_display_backlight_enforce_auto);
+#endif
+    furi_record_close(RECORD_NOTIFICATION);
+
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewTextInput);
+    text_input_free(app->text_input);
+    free(app->temp_buffer);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewAbout);
+    widget_free(app->widget_about);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewWrite);
+    with_view_model(
+        app->view_write,
+        T5577WriterModel * model,
+        {
+            if(model->content != NULL) {
+                free(model->content);
+            }
+        },
+        false);
+    view_free(app->view_write);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewLoad);
+    view_free(app->view_load);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewConfigure_i);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewConfigure_e);
+    variable_item_list_free(app->variable_item_list_config);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewSave);
+    view_dispatcher_remove_view(app->view_dispatcher,T5577WriterViewByteInput);
+    view_free(app->view_save);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewSubmenu);
+    submenu_free(app->submenu);
+    view_dispatcher_free(app->view_dispatcher);
+    furi_record_close(RECORD_GUI);
+
+    free(app);
+}
+
+/**
+ * @brief      Main function for t5577_writer application.
+ * @details    This function is the entry point for the t5577_writer application.  It should be defined in
+ *           application.fam as the entry_point setting.
+ * @param      _p  Input parameter - unused
+ * @return     0 - Success
+*/
+int32_t main_t5577_writer_app(void* _p) {
+    UNUSED(_p);
+
+    T5577WriterApp* app = t5577_writer_app_alloc();
+
+    view_dispatcher_run(app->view_dispatcher);
+
+    t5577_writer_app_free(app);
+    return 0;
+}

t5577_config.c

@@ -0,0 +1,26 @@
+#include "t5577_config.h"
+
+const t5577_modulation all_mods[] = {
+    { "Direct", LFRFID_T5577_MODULATION_DIRECT },
+    { "PSK1", LFRFID_T5577_MODULATION_PSK1 },
+    { "PSK2", LFRFID_T5577_MODULATION_PSK2 },
+    { "PSK3", LFRFID_T5577_MODULATION_PSK3 },
+    { "FSK1", LFRFID_T5577_MODULATION_FSK1 },
+    { "FSK2", LFRFID_T5577_MODULATION_FSK2 },
+    { "FSK1a", LFRFID_T5577_MODULATION_FSK1a },
+    { "FSK2a", LFRFID_T5577_MODULATION_FSK2a },
+    { "ASK/MC", LFRFID_T5577_MODULATION_MANCHESTER },
+    { "Biphase", LFRFID_T5577_MODULATION_BIPHASE },
+    { "Diphase", LFRFID_T5577_MODULATION_DIPHASE },
+};
+
+const t5577_rf_clock all_rf_clocks[] = {
+    { 8, LFRFID_T5577_BITRATE_RF_8 },
+    { 16, LFRFID_T5577_BITRATE_RF_16 },
+    { 32, LFRFID_T5577_BITRATE_RF_32 },
+    { 40, LFRFID_T5577_BITRATE_RF_40 },
+    { 50, LFRFID_T5577_BITRATE_RF_50 },
+    { 64, LFRFID_T5577_BITRATE_RF_64 },
+    { 100, LFRFID_T5577_BITRATE_RF_100 },
+    { 128, LFRFID_T5577_BITRATE_RF_128 }
+};

t5577_config.h

@@ -0,0 +1,27 @@
+#ifndef T5577_CONFIG_H
+#define T5577_CONFIG_H
+
+#include <stdint.h>
+#include <stdio.h>
+#include <lib/lfrfid/tools/t5577.h>
+
+
+#define MODULATION_NUM 11
+#define CLOCK_NUM 8
+
+
+typedef struct {
+    char* modulation_name; 
+    uint32_t mod_page_zero;
+} t5577_modulation;
+
+extern const t5577_modulation all_mods[MODULATION_NUM];
+
+typedef struct {
+    uint8_t rf_clock_num; 
+    uint32_t clock_page_zero;
+} t5577_rf_clock;
+
+extern const t5577_rf_clock all_rf_clocks[CLOCK_NUM];
+
+#endif // T5577_CONFIG_H

t5577_writer.c

@@ -0,0 +1,831 @@
+#include <furi.h>
+#include <furi_hal.h>
+#include <gui/gui.h>
+#include <gui/view.h>
+#include <gui/view_dispatcher.h>
+#include <gui/modules/popup.h>
+#include <gui/modules/submenu.h>
+#include <gui/modules/text_input.h>
+#include <gui/modules/widget.h>
+#include <gui/modules/variable_item_list.h>
+#include <notification/notification.h>
+#include <notification/notification_messages.h>
+#include "t5577_writer_icons.h"
+#include <applications/services/storage/storage.h>
+#include <applications/services/dialogs/dialogs.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <t5577_config.h>
+#include <t5577_writer.h>
+
+#define TAG "T5577 Writer"
+
+// Change this to BACKLIGHT_AUTO if you don't want the backlight to be continuously on.
+#define BACKLIGHT_AUTO 1
+
+// Our application menu has 3 items.  You can add more items if you want.
+typedef enum {
+    T5577WriterSubmenuIndexLoad,
+    T5577WriterSubmenuIndexSave,
+    T5577WriterSubmenuIndexConfigure,
+    T5577WriterSubmenuIndexWrite,
+    T5577WriterSubmenuIndexAbout,
+} T5577WriterSubmenuIndex;
+
+// Each view is a screen we show the user.
+typedef enum {
+    T5577WriterViewSubmenu, // The menu when the app starts
+    T5577WriterViewTextInput, // Input for configuring text settings
+    T5577WriterViewLoad,
+    T5577WriterViewSave,
+    T5577WriterViewConfigure_i, // The configuration screen
+    T5577WriterViewConfigure_e, // The configuration screen
+    T5577WriterViewWrite, // The main screen
+    T5577WriterViewAbout, // The about screen with directions, link to social channel, etc.
+} T5577WriterView;
+
+typedef enum {
+    T5577WriterEventIdRedrawScreen = 0, // Custom event to redraw the screen
+    T5577WriterEventIdOkPressed = 42, // Custom event to process OK button getting pressed down
+} T5577WriterEventId;
+
+typedef struct {
+    ViewDispatcher* view_dispatcher; // Switches between our views
+    NotificationApp* notifications; // Used for controlling the backlight
+    Submenu* submenu; // The application menu
+    TextInput* text_input; // The text input screen
+    VariableItemList* variable_item_list_config; // The configuration screen
+    View* view_config_e; // The configuration screen
+    View* view_save; 
+    View* view_write; // The main screen
+    Widget* widget_about; // The about screen
+    View* view_load; // The load view
+
+    VariableItem* mod_item; // 
+    VariableItem* clock_item; //
+    VariableItem* block_num_item; // 
+    VariableItem* block_slc_item; //
+    char* temp_buffer; // Temporary buffer for text input
+    uint32_t temp_buffer_size; // Size of temporary buffer
+    
+    DialogsApp* dialogs;
+    FuriString* file_path;
+    FuriTimer* timer; // Timer for redrawing the screen
+} T5577WriterApp;
+
+
+typedef struct {
+    uint8_t modulation_index; // The index for total number of pins
+    uint8_t rf_clock_index; // The index for total number of pins
+    FuriString* tag_name_str; // The name setting
+    uint8_t user_block_num; // The total number of pins we are adjusting
+    uint32_t* content; // The cutting content
+    t5577_modulation modulation;
+    t5577_rf_clock rf_clock;
+    bool data_loaded[3];
+    uint8_t edit_block_slc;
+} T5577WriterModel;
+
+static inline int min(int a, int b) {
+    return (a < b) ? a : b;
+}
+
+static inline int max(int a, int b) {
+    return (a > b) ? a : b;
+}
+
+void initialize_config(T5577WriterModel* model) {
+    model->modulation_index = 0;
+    memcpy(&model->modulation, &all_mods[model->modulation_index], sizeof(t5577_modulation));
+    model->rf_clock_index = 0;
+    memcpy(&model->rf_clock, &all_mods[model->rf_clock_index], sizeof(t5577_rf_clock));
+}
+
+void initialize_model(T5577WriterModel* model) {
+    if(model->content != NULL) {
+        free(model->content);
+    }
+    initialize_config(model);
+    model->user_block_num = 1;
+    model->edit_block_slc = 1;
+    model->content = (uint32_t*)malloc(LFRFID_T5577_BLOCK_COUNT * sizeof(uint32_t));
+    for(uint32_t i = 0; i < LFRFID_T5577_BLOCK_COUNT; i++) {
+        model->content[i] = 0;
+    }
+    memset(model->data_loaded, false, sizeof(model->data_loaded));
+}
+
+uint8_t rf_clock_choices[COUNT_OF(all_rf_clocks)];
+void initialize_rf_clock_choices(uint8_t* rf_clock_choices) {
+    // Populate the rf_clock_choices array
+    for (size_t i = 0; i < COUNT_OF(all_rf_clocks); i++) {
+        rf_clock_choices[i] = all_rf_clocks[i].rf_clock_num;
+    }
+}
+
+char* modulation_names[COUNT_OF(all_mods)];
+void initialize_mod_names(char** modulation_names) {
+    // Populate the modulation_names array
+    for (size_t i = 0; i < COUNT_OF(all_mods); i++) {
+        modulation_names[i] = all_mods[i].modulation_name;
+    }
+}
+
+/**
+ * @brief      Callback for exiting the application.
+ * @details    This function is called when user press back button.  We return VIEW_NONE to
+ *            indicate that we want to exit the application.
+ * @param      _context  The context - unused
+ * @return     next view id
+*/
+static uint32_t t5577_writer_navigation_exit_callback(void* _context) {
+    UNUSED(_context);
+    return VIEW_NONE;
+}
+
+/**
+ * @brief      Callback for returning to submenu.
+ * @details    This function is called when user press back button.  We return VIEW_NONE to
+ *            indicate that we want to navigate to the submenu.
+ * @param      _context  The context - unused
+ * @return     next view id
+*/
+static uint32_t t5577_writer_navigation_submenu_callback(void* _context) {
+    UNUSED(_context);
+    return T5577WriterViewSubmenu;
+}
+
+
+/**
+ * @brief      Callback for returning to configure screen.
+ * @details    This function is called when user press back button.  We return VIEW_NONE to
+ *            indicate that we want to navigate to the configure screen.
+ * @param      _context  The context - unused
+ * @return     next view id
+*/
+//static uint32_t t5577_writer_navigation_configure_callback(void* _context) {
+//    UNUSED(_context);
+//    return T5577WriterViewConfigure_i;
+//}
+
+static uint32_t t5577_writer_navigation_file_callback(void* _context) {
+    UNUSED(_context);
+    return T5577WriterViewSubmenu;
+}
+
+/**
+ * @brief      Handle submenu item selection.
+ * @details    This function is called when user selects an item from the submenu.
+ * @param      context  The context - T5577WriterApp object.
+ * @param      index     The T5577WriterSubmenuIndex item that was clicked.
+*/
+static void t5577_writer_submenu_callback(void* context, uint32_t index) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    switch(index) {
+    case T5577WriterSubmenuIndexLoad:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewLoad);
+        break;
+    case T5577WriterSubmenuIndexSave:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSave);
+        break;
+    case T5577WriterSubmenuIndexConfigure:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewConfigure_e);
+        break;
+    case T5577WriterSubmenuIndexWrite:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewWrite);
+        break;
+    case T5577WriterSubmenuIndexAbout:
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewAbout);
+        break;
+    default:
+        break;
+    }
+}
+
+/**
+ * Our 1st sample setting is a team color.  We have 3 options: red, green, and blue.
+*/
+static const char* modulation_config_label = "Modulation";
+//static char* modulation_names[] = {"Direct", "PSK1", "PSK2", "PSK3", "FSK1", "FSK2", "FSK1a", "FSK2a","ASK/Man","Biphase","Diphase"};
+static void t5577_writer_modulation_change(VariableItem* item) {
+    T5577WriterApp* app = variable_item_get_context(item);
+    FURI_LOG_D(TAG,"app defined");
+    T5577WriterModel* model = view_get_model(app->view_write);
+    FURI_LOG_D(TAG,"model defined");
+    if (model->data_loaded[0]) {
+        FURI_LOG_D(TAG,"loaded entered");
+        variable_item_set_current_value_index(item,model->modulation_index);
+    } else{
+        FURI_LOG_D(TAG,"else entered");
+        uint8_t modulation_index = variable_item_get_current_value_index(item);
+        model->modulation_index = modulation_index;
+        model->modulation = all_mods[modulation_index];
+    }
+    model->data_loaded[0] = false;
+    variable_item_set_current_value_text(item, modulation_names[model->modulation_index]);
+}
+
+static const char* rf_clock_config_label = "RF Clock";
+static void t5577_writer_rf_clock_change(VariableItem* item) {
+    T5577WriterApp* app = variable_item_get_context(item);
+    T5577WriterModel* model = view_get_model(app->view_write);
+
+    if (model->data_loaded[1]) {
+        variable_item_set_current_value_index(item,model->rf_clock_index);
+    } else{
+        uint8_t rf_clock_index = variable_item_get_current_value_index(item);
+        model->rf_clock_index = rf_clock_index;
+        model->rf_clock = all_rf_clocks[rf_clock_index];
+        
+    }
+    model->data_loaded[1] = false;
+    FuriString *buffer = furi_string_alloc();
+    furi_string_printf(buffer, "%u", rf_clock_choices[model->rf_clock_index]);
+    variable_item_set_current_value_text(item, furi_string_get_cstr(buffer));
+    furi_string_free(buffer);
+}
+
+static const char* user_block_num_config_label = "Num of Blocks";
+static void t5577_writer_user_block_num_change(VariableItem* item) {
+    T5577WriterApp* app = variable_item_get_context(item);
+    T5577WriterModel* model = view_get_model(app->view_write);
+    if (model->data_loaded[2]) {
+        variable_item_set_current_value_index(item,model->user_block_num - 1);
+    } else {
+        uint8_t user_block_num_index = variable_item_get_current_value_index(item);
+        model->user_block_num = user_block_num_index + 1;
+    }
+    model->data_loaded[2] = false;
+    FuriString *buffer = furi_string_alloc();
+    furi_string_printf(buffer, "%u", model->user_block_num);
+    variable_item_set_current_value_text(item, furi_string_get_cstr(buffer));
+    for(uint8_t i = model->user_block_num; i < LFRFID_T5577_BLOCK_COUNT; i++) {
+        model->content[i] = 0;
+    }
+    furi_string_free(buffer);
+}
+
+static const char* edit_block_slc_config_label = "Edit Block";
+static void t5577_writer_edit_block_slc_change(VariableItem* item) {
+    T5577WriterApp* app = variable_item_get_context(item);
+    T5577WriterModel* model = view_get_model(app->view_write);
+    uint8_t edit_block_slc_index = variable_item_get_current_value_index(item);
+    model->edit_block_slc = edit_block_slc_index + 1;
+    variable_item_set_current_value_index(item,model->edit_block_slc - 1);
+    FuriString *buffer = furi_string_alloc();
+    furi_string_printf(buffer, "%u", model->edit_block_slc);
+    variable_item_set_current_value_text(item, furi_string_get_cstr(buffer));
+    furi_string_free(buffer);
+}
+
+void ensure_dir_exists(Storage *storage)
+{
+    // If apps_data directory doesn't exist, create it.
+    if (!storage_dir_exists(storage, T5577_WRITER_APPS_DATA_FOLDER))
+    {
+        FURI_LOG_I(TAG, "Creating directory: %s", T5577_WRITER_APPS_DATA_FOLDER);
+        storage_simply_mkdir(storage, T5577_WRITER_APPS_DATA_FOLDER);
+    }
+    else
+    {
+        FURI_LOG_I(TAG, "Directory exists: %s", T5577_WRITER_APPS_DATA_FOLDER);
+    }
+
+    // If wiegand directory doesn't exist, create it.
+    if (!storage_dir_exists(storage, T5577_WRITER_FILE_FOLDER))
+    {
+        FURI_LOG_I(TAG, "Creating directory: %s", T5577_WRITER_FILE_FOLDER);
+        storage_simply_mkdir(storage, T5577_WRITER_FILE_FOLDER);
+    }
+    else
+    {
+        FURI_LOG_I(TAG, "Directory exists: %s", T5577_WRITER_FILE_FOLDER);
+    }
+}
+/**
+ * Our 2nd sample setting is a text field.  When the user clicks OK on the configuration 
+ * setting we use a text input screen to allow the user to enter a name.  This function is
+ * called when the user clicks OK on the text input screen.
+*/
+static const char* tag_name_entry_text = "Enter name";
+static const char* tag_name_default_value = "Tag_1";
+static void t5577_writer_file_saver(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* model = view_get_model(app->view_write);
+    model->content[0] = 0;
+    model->content[0] |= model->modulation.mod_page_zero;
+    model->content[0] |= model->rf_clock.clock_page_zero;
+    model->content[0] |= (model->user_block_num << LFRFID_T5577_MAXBLOCK_SHIFT);
+    bool redraw = true;
+    with_view_model(
+        app->view_write,
+        T5577WriterModel * model,
+        {
+            furi_string_set(model->tag_name_str, app->temp_buffer);
+        },
+        redraw);
+    FuriString *buffer = furi_string_alloc();
+    FuriString *file_path = furi_string_alloc();
+    furi_string_printf(
+        file_path, "%s/%s%s", T5577_WRITER_FILE_FOLDER, furi_string_get_cstr(model->tag_name_str), T5577_WRITER_FILE_EXTENSION);
+
+    Storage *storage = furi_record_open(RECORD_STORAGE);
+    ensure_dir_exists(storage);
+    File *data_file = storage_file_alloc(storage);
+    if (storage_file_open(
+            data_file, furi_string_get_cstr(file_path), FSAM_WRITE, FSOM_OPEN_ALWAYS))
+    {
+        furi_string_printf(buffer, "Filetype: Flipper T5577 Raw File\n");
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "Version: 1.0\n");
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "Modulation: %s\n", model->modulation.modulation_name);
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "RF Clock: %u\n", model->rf_clock.rf_clock_num);
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "Number of User Blocks: %u\n", model->user_block_num);
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        furi_string_printf(buffer, "\nRaw Data:\n");
+        for (int i = 0; i < model->user_block_num; i++)
+        {   
+            furi_string_cat_printf(
+                buffer,
+                "Block %u: %08lX\n",
+                i,
+                model->content[i]);
+        
+        }
+        furi_string_push_back(buffer, '\n');
+        storage_file_write(data_file, furi_string_get_cstr(buffer), furi_string_size(buffer));
+        storage_file_close(data_file);
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSubmenu);
+    }
+}
+
+void t5577_writer_update_config_from_load(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* my_model = view_get_model(app->view_write);
+
+    
+    for (size_t i = 0; i < COUNT_OF(all_mods); i++) {
+        if ((my_model->content[0] & all_mods[i].mod_page_zero) == all_mods[i].mod_page_zero) {
+            my_model->modulation_index = (uint8_t)i;
+            my_model->modulation = all_mods[my_model->modulation_index];
+        }
+    }
+
+    for (size_t i = 0; i < COUNT_OF(all_rf_clocks); i++) {
+        if ((my_model->content[0] & all_rf_clocks[i].clock_page_zero) == all_rf_clocks[i].clock_page_zero) {
+            my_model->rf_clock_index = (uint8_t)i;
+            my_model->rf_clock = all_rf_clocks[my_model->rf_clock_index];
+        }
+    }
+
+    my_model->user_block_num = (my_model->content[0] >> LFRFID_T5577_MAXBLOCK_SHIFT) & 0x7;
+
+    memset(my_model->data_loaded, true, sizeof(my_model->data_loaded));
+
+}
+
+static void t5577_writer_config_enter_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+
+    variable_item_list_reset(app->variable_item_list_config);
+    app->mod_item = variable_item_list_add(
+        app->variable_item_list_config,
+        modulation_config_label,
+        COUNT_OF(modulation_names),
+        t5577_writer_modulation_change,
+        app);
+    app->clock_item = variable_item_list_add(
+        app->variable_item_list_config,
+        rf_clock_config_label,
+        COUNT_OF(rf_clock_choices),
+        t5577_writer_rf_clock_change,
+        app);
+    app->block_num_item = variable_item_list_add(
+        app->variable_item_list_config,
+        user_block_num_config_label,
+        LFRFID_T5577_BLOCK_COUNT,
+        t5577_writer_user_block_num_change,
+        app);
+    app->block_slc_item = variable_item_list_add(
+        app->variable_item_list_config,
+        edit_block_slc_config_label,
+        LFRFID_T5577_BLOCK_COUNT - 1,
+        t5577_writer_edit_block_slc_change,
+        app);
+    View* view_config_i = variable_item_list_get_view(app->variable_item_list_config);
+    t5577_writer_modulation_change(app->mod_item);
+    t5577_writer_rf_clock_change(app->clock_item);
+    t5577_writer_user_block_num_change(app->block_num_item);
+    t5577_writer_edit_block_slc_change(app->block_slc_item);
+    view_set_previous_callback(
+        view_config_i,
+        t5577_writer_navigation_submenu_callback);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewConfigure_i);
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewConfigure_i,
+        view_config_i);
+    view_dispatcher_switch_to_view(app->view_dispatcher,T5577WriterViewConfigure_i);
+    FURI_LOG_D(TAG,"enter_callback_finished");
+}
+
+void t5577_writer_view_load_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    T5577WriterModel* model = view_get_model(app->view_write);
+    DialogsFileBrowserOptions browser_options;
+    Storage* storage = furi_record_open(RECORD_STORAGE);
+    ensure_dir_exists(storage);
+    File* data_file = storage_file_alloc(storage);
+    dialog_file_browser_set_basic_options(&browser_options, T5577_WRITER_FILE_EXTENSION, NULL);
+    browser_options.base_path = T5577_WRITER_FILE_FOLDER;
+    furi_string_set(app->file_path, browser_options.base_path);
+    FuriString* buffer = furi_string_alloc();
+
+    if(dialog_file_browser_show(app->dialogs, app->file_path, app->file_path, &browser_options)) {
+        
+        if(storage_file_open(
+               data_file, furi_string_get_cstr(app->file_path), FSAM_READ, FSOM_OPEN_EXISTING)) {
+            while(!storage_file_eof(data_file)) { // fill buffer with every line because ch == '\n'
+                char ch;
+                furi_string_reset(buffer);
+                while(storage_file_read(data_file, &ch, 1) && !storage_file_eof(data_file)) {
+                    furi_string_push_back(buffer, ch);
+                    if(ch == '\n') {
+                        break;
+                    }
+                }
+                if(furi_string_start_with(buffer, "Block ")) {
+                    uint32_t row_data_buffer = 0;
+                    char row_data_char_buffer[] = "00000000";
+                    uint32_t row_num_buffer = 0;
+                    char row_num_char_buffer[] = "0";
+                    int length = furi_string_size(buffer);
+                    char ch;
+                    int i = 0;
+                    while(i < length) {
+                        if(furi_string_get_char(buffer, i) == ':') {
+                            row_num_char_buffer[0] = furi_string_get_char(buffer, i - 1); //the number before ":" is block num
+                            i += 2; // skip a space
+                            for(size_t j = 0; j < sizeof(row_data_char_buffer); j++) {
+                                ch = furi_string_get_char(buffer, i);
+                                row_data_char_buffer[j] = ch;
+                                i++;
+                            }
+                            break;
+                        }
+                        i++;
+                    }
+                    sscanf(row_num_char_buffer, "%lx", &row_num_buffer);
+                    sscanf(row_data_char_buffer, "%lx", &row_data_buffer);
+                    model->content[row_num_buffer] = row_data_buffer;
+                }
+            }
+            storage_file_close(data_file);
+            t5577_writer_update_config_from_load(app);
+        }
+        storage_file_free(data_file);
+        furi_record_close(RECORD_STORAGE);
+    }
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSubmenu);
+}
+
+
+/**
+ * @brief      Callback when item in configuration screen is clicked.
+ * @details    This function is called when user clicks OK on an item in the configuration screen.
+ *            If the item clicked is our text field then we switch to the text input screen.
+ * @param      context  The context - T5577WriterApp object.
+ * @param      index - The index of the item that was clicked.
+*/
+static void t5577_writer_view_save_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    // Header to display on the text input screen.
+    text_input_set_header_text(app->text_input, tag_name_entry_text);
+    // Copy the current name into the temporary buffer.
+    bool redraw = false;
+    with_view_model(
+        app->view_write,
+        T5577WriterModel * model,
+        {
+            strncpy(
+                app->temp_buffer,
+                furi_string_get_cstr(model->tag_name_str),
+                app->temp_buffer_size);
+        },
+        redraw);
+    // Configure the text input.  When user enters text and clicks OK, t5577_writer_setting_text_updated be called.
+    bool clear_previous_text = false;
+    text_input_set_result_callback(
+        app->text_input,
+        t5577_writer_file_saver,
+        app,
+        app->temp_buffer,
+        app->temp_buffer_size,
+        clear_previous_text);
+    // Pressing the BACK button will reload the configure screen.
+    view_set_previous_callback(
+        text_input_get_view(app->text_input), t5577_writer_navigation_file_callback);
+
+    // Show text input dialog.
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewTextInput);
+    
+}
+
+/**
+ * @brief      Callback for drawing the game screen.
+ * @details    This function is called when the screen needs to be redrawn, like when the model gets updated.
+ * @param      canvas  The canvas to draw on.
+ * @param      model   The model - MyModel object.
+*/
+static void t5577_writer_view_write_callback(Canvas* canvas, void* model) {
+    T5577WriterModel* my_model = (T5577WriterModel*)model;
+    my_model->content[0] = 0;
+    my_model->content[0] |= my_model->modulation.mod_page_zero;
+    my_model->content[0] |= my_model->rf_clock.clock_page_zero;
+    my_model->content[0] |= (my_model->user_block_num << LFRFID_T5577_MAXBLOCK_SHIFT);
+
+    LFRFIDT5577* data = (LFRFIDT5577*)malloc(sizeof(LFRFIDT5577));
+    data->blocks_to_write = my_model->user_block_num;
+    for(size_t i = 0; i < data->blocks_to_write; i++) {
+        data->block[i] = my_model->content[i];
+    }
+    data->block[1] = 0x007F9FB6;
+    data->block[2] = 0xB59FD7F9;
+    data->block[3] = 0x006BDFAE;
+    data->block[4] = 0xACB83B53;
+    t5577_write(data);
+    free(data);
+
+    canvas_draw_line(canvas, 0, 25, 120, 50);
+}
+
+/**
+ * @brief      Callback for timer elapsed.
+ * @details    This function is called when the timer is elapsed.  We use this to queue a redraw event.
+ * @param      context  The context - T5577WriterApp object.
+*/
+static void t5577_writer_view_write_timer_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, T5577WriterEventIdRedrawScreen);
+}
+
+/**
+ * @brief      Callback when the user starts the game screen.
+ * @details    This function is called when the user enters the game screen.  We start a timer to
+ *           redraw the screen periodically (so the random number is refreshed).
+ * @param      context  The context - T5577WriterApp object.
+*/
+static void t5577_writer_view_write_enter_callback(void* context) {
+    uint32_t period = furi_ms_to_ticks(500);
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    furi_assert(app->timer == NULL);
+    app->timer =
+        furi_timer_alloc(t5577_writer_view_write_timer_callback, FuriTimerTypePeriodic, context);
+    furi_timer_start(app->timer, period);
+}
+
+/**
+ * @brief      Callback when the user exits the game screen.
+ * @details    This function is called when the user exits the game screen.  We stop the timer.
+ * @param      context  The context - T5577WriterApp object.
+*/
+static void t5577_writer_view_write_exit_callback(void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    furi_timer_stop(app->timer);
+    furi_timer_free(app->timer);
+    app->timer = NULL;
+}
+
+/**
+ * @brief      Callback for custom events.
+ * @details    This function is called when a custom event is sent to the view dispatcher.
+ * @param      event    The event id - T5577WriterEventId value.
+ * @param      context  The context - T5577WriterApp object.
+*/
+static bool t5577_writer_view_write_custom_event_callback(uint32_t event, void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    switch(event) {
+    case T5577WriterEventIdRedrawScreen:
+        // Redraw screen by passing true to last parameter of with_view_model.
+        {
+            bool redraw = true;
+            with_view_model(
+                app->view_write, T5577WriterModel * _model, { UNUSED(_model); }, redraw);
+            return true;
+        }
+    case T5577WriterEventIdOkPressed:
+        // Process the OK button.  We go to the saving scene.
+        view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSubmenu);
+        return true;
+    default:
+        return false;
+    }
+}
+
+/**
+ * @brief      Callback for game screen input.
+ * @details    This function is called when the user presses a button while on the game screen.
+ * @param      event    The event - InputEvent object.
+ * @param      context  The context - T5577WriterApp object.
+ * @return     true if the event was handled, false otherwise.
+*/
+static bool t5577_writer_view_write_input_callback(InputEvent* event, void* context) {
+    T5577WriterApp* app = (T5577WriterApp*)context;
+    if(event->type == InputTypeShort) {
+        if(event->key == InputKeyOk) {
+        // We choose to send a custom event when user presses OK button.  t5577_writer_custom_event_callback will
+        // handle our T5577WriterEventIdOkPressed event.  We could have just put the code from
+        // t5577_writer_custom_event_callback here, it's a matter of preference.
+        view_dispatcher_send_custom_event(app->view_dispatcher, T5577WriterEventIdOkPressed);
+        return true;
+        }
+    }
+    return false;
+}
+
+/**
+ * @brief      Allocate the t5577_writer application.
+ * @details    This function allocates the t5577_writer application resources.
+ * @return     T5577WriterApp object.
+*/
+static T5577WriterApp* t5577_writer_app_alloc() {
+    T5577WriterApp* app = (T5577WriterApp*)malloc(sizeof(T5577WriterApp));
+
+    Gui* gui = furi_record_open(RECORD_GUI);
+
+    app->view_dispatcher = view_dispatcher_alloc();
+    app->dialogs = furi_record_open(RECORD_DIALOGS);
+    app->file_path = furi_string_alloc();
+    view_dispatcher_enable_queue(app->view_dispatcher);
+    view_dispatcher_attach_to_gui(app->view_dispatcher, gui, ViewDispatcherTypeFullscreen);
+    view_dispatcher_set_event_callback_context(app->view_dispatcher, app);
+    app->submenu = submenu_alloc();
+    submenu_add_item(
+        app->submenu, "Write", T5577WriterSubmenuIndexWrite, t5577_writer_submenu_callback, app);
+    submenu_add_item(
+        app->submenu, "Config", T5577WriterSubmenuIndexConfigure, t5577_writer_submenu_callback, app);
+    submenu_add_item(
+        app->submenu, "Save", T5577WriterSubmenuIndexSave, t5577_writer_submenu_callback, app);
+    submenu_add_item(
+        app->submenu, "Load", T5577WriterSubmenuIndexLoad, t5577_writer_submenu_callback, app);
+    submenu_add_item(
+        app->submenu, "About", T5577WriterSubmenuIndexAbout, t5577_writer_submenu_callback, app);
+    view_set_previous_callback(submenu_get_view(app->submenu), t5577_writer_navigation_exit_callback);
+    view_dispatcher_add_view(
+        app->view_dispatcher, T5577WriterViewSubmenu, submenu_get_view(app->submenu));
+    view_dispatcher_switch_to_view(app->view_dispatcher, T5577WriterViewSubmenu);
+
+    app->text_input = text_input_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, T5577WriterViewTextInput, text_input_get_view(app->text_input));
+
+
+    app->view_load = view_alloc();
+    view_set_previous_callback(app->view_load, t5577_writer_navigation_submenu_callback);
+    view_set_enter_callback(app->view_load, t5577_writer_view_load_callback);
+    view_set_context(app->view_load, app);
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewLoad,
+        app->view_load);
+
+    app->temp_buffer_size = 32;
+    app->temp_buffer = (char*)malloc(app->temp_buffer_size);
+    
+    
+    app->view_write = view_alloc();
+    view_set_draw_callback(app->view_write, t5577_writer_view_write_callback);
+    view_set_input_callback(app->view_write, t5577_writer_view_write_input_callback);
+    view_set_previous_callback(app->view_write, t5577_writer_navigation_submenu_callback);
+    view_set_enter_callback(app->view_write, t5577_writer_view_write_enter_callback);
+    view_set_exit_callback(app->view_write, t5577_writer_view_write_exit_callback);
+    view_set_context(app->view_write, app);
+    view_set_custom_callback(app->view_write, t5577_writer_view_write_custom_event_callback);
+    view_allocate_model(app->view_write, ViewModelTypeLockFree, sizeof(T5577WriterModel));
+    view_dispatcher_add_view(app->view_dispatcher, T5577WriterViewWrite, app->view_write);
+
+    T5577WriterModel* model = view_get_model(app->view_write); // initialize model
+
+    FuriString* tag_name_str = furi_string_alloc();
+    furi_string_set_str(tag_name_str, tag_name_default_value);
+    
+    model->tag_name_str = tag_name_str;
+    initialize_model(model);
+    initialize_rf_clock_choices(rf_clock_choices);
+    initialize_mod_names(modulation_names);
+
+    app->view_save = view_alloc();
+    view_set_previous_callback(app->view_save, t5577_writer_navigation_submenu_callback);
+    view_set_enter_callback(app->view_save, t5577_writer_view_save_callback);
+    view_set_context(app->view_save, app);
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewSave,
+        app->view_save);
+
+
+    app->variable_item_list_config = variable_item_list_alloc();
+
+    app->view_config_e = view_alloc();
+    view_set_previous_callback(
+        app->view_config_e,
+        t5577_writer_navigation_submenu_callback);
+    view_set_enter_callback(app->view_config_e, t5577_writer_config_enter_callback);
+    view_set_context(app->view_config_e, app);
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewConfigure_e,
+        app->view_config_e);
+        
+    View* view_buffer = view_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        T5577WriterViewConfigure_i,
+        view_buffer);
+    
+
+    app->widget_about = widget_alloc();
+    widget_add_text_scroll_element(
+        app->widget_about,
+        0,
+        0,
+        128,
+        64,
+        "T5577 Writer v0.1");
+    view_set_previous_callback(
+        widget_get_view(app->widget_about), t5577_writer_navigation_submenu_callback);
+    view_dispatcher_add_view(
+        app->view_dispatcher, T5577WriterViewAbout, widget_get_view(app->widget_about));
+
+    app->notifications = furi_record_open(RECORD_NOTIFICATION);
+
+#ifdef BACKLIGHT_ON
+    notification_message(app->notifications, &sequence_display_backlight_enforce_on);
+#endif
+
+    return app;
+}
+
+/**
+ * @brief      Free the t5577_writer application.
+ * @details    This function frees the t5577_writer application resources.
+ * @param      app  The t5577_writer application object.
+*/
+static void t5577_writer_app_free(T5577WriterApp* app) {
+#ifdef BACKLIGHT_ON
+    notification_message(app->notifications, &sequence_display_backlight_enforce_auto);
+#endif
+    furi_record_close(RECORD_NOTIFICATION);
+
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewTextInput);
+    text_input_free(app->text_input);
+    free(app->temp_buffer);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewAbout);
+    widget_free(app->widget_about);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewWrite);
+    with_view_model(
+        app->view_write,
+        T5577WriterModel * model,
+        {
+            if(model->content != NULL) {
+                free(model->content);
+            }
+        },
+        false);
+    view_free(app->view_write);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewLoad);
+    view_free(app->view_load);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewConfigure_i);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewConfigure_e);
+    variable_item_list_free(app->variable_item_list_config);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewSave);
+    view_free(app->view_save);
+    view_dispatcher_remove_view(app->view_dispatcher, T5577WriterViewSubmenu);
+    submenu_free(app->submenu);
+    view_dispatcher_free(app->view_dispatcher);
+    furi_record_close(RECORD_GUI);
+
+    free(app);
+}
+
+/**
+ * @brief      Main function for t5577_writer application.
+ * @details    This function is the entry point for the t5577_writer application.  It should be defined in
+ *           application.fam as the entry_point setting.
+ * @param      _p  Input parameter - unused
+ * @return     0 - Success
+*/
+int32_t main_t5577_writer_app(void* _p) {
+    UNUSED(_p);
+
+    T5577WriterApp* app = t5577_writer_app_alloc();
+
+    view_dispatcher_run(app->view_dispatcher);
+
+    t5577_writer_app_free(app);
+    return 0;
+}

t5577_writer.h

@@ -0,0 +1,3 @@
+#define T5577_WRITER_APPS_DATA_FOLDER EXT_PATH("apps_data")
+#define T5577_WRITER_FILE_FOLDER      EXT_PATH("apps_data/t5577_writer")
+#define T5577_WRITER_FILE_EXTENSION ".t5577"