unleashed-firmware/applications/main/nfc/scenes/nfc_scene_emulate.c

#include "../helpers/protocol_support/nfc_protocol_support.h"

#include "nfc_app_i.h"

#define NFC_EMULATION_TIME_MAX_MS (5 * 60 * 1000)

FuriTimer* timer;

void nfc_scene_emulate_timer_callback(void* context) {
    NfcApp* instance = context;

    view_dispatcher_send_custom_event(
        instance->view_dispatcher, NfcCustomEventEmulationTimeExpired);
}

void nfc_scene_emulate_on_enter(void* context) {
    NfcApp* instance = context;

    nfc_protocol_support_on_enter(NfcProtocolSupportSceneEmulate, context);

    timer = furi_timer_alloc(nfc_scene_emulate_timer_callback, FuriTimerTypeOnce, instance);
    furi_timer_start(timer, NFC_EMULATION_TIME_MAX_MS);
}

bool nfc_scene_emulate_on_event(void* context, SceneManagerEvent event) {
    NfcApp* instance = context;

    if(event.type == SceneManagerEventTypeCustom) {
        if(event.event == NfcCustomEventEmulationTimeExpired) {
            if(!scene_manager_previous_scene(instance->scene_manager)) {
                scene_manager_stop(instance->scene_manager);
                view_dispatcher_stop(instance->view_dispatcher);
            } else {
                scene_manager_previous_scene(instance->scene_manager);
            }
            return true;
        }
    }
    return nfc_protocol_support_on_event(NfcProtocolSupportSceneEmulate, context, event);
}

void nfc_scene_emulate_on_exit(void* context) {
    furi_timer_free(timer);
    nfc_protocol_support_on_exit(NfcProtocolSupportSceneEmulate, context);
}