fix(core): fix usb disconnected warning in new homescreen

[no changelog]

core/embed/rust/build.rs

@@ -329,7 +329,9 @@ fn generate_trezorhal_bindings() {
         .allowlist_function("buffers_get_line_buffer_4bpp")
         .allowlist_function("buffers_get_text_buffer")
         .allowlist_var("text_buffer_height")
-        .allowlist_var("buffer_width");
+        .allowlist_var("buffer_width")
+        //usb
+        .allowlist_function("usb_configured");
     // Write the bindings to a file in the OUR_DIR.
     bindings
         .generate()

core/embed/rust/src/trezorhal/mod.rs

@@ -13,6 +13,7 @@ pub mod random;
 pub mod rgb_led;
 pub mod slip39;
 pub mod storage;
+pub mod usb;
 pub mod uzlib;
 
 pub mod buffers;

core/embed/rust/src/trezorhal/usb.rs

@@ -0,0 +1,5 @@
+use super::ffi;
+
+pub fn usb_configured() -> bool {
+    unsafe { ffi::usb_configured() == ffi::sectrue }
+}

core/embed/rust/src/ui/model_tt/component/homescreen.rs

@@ -1,5 +1,6 @@
 use crate::{
     time::{Duration, Instant},
+    trezorhal::usb::usb_configured,
     ui::{
         component::{Component, Empty, Event, EventCtx, Pad, TimerToken},
         display::{self, Color, Font},
@@ -45,7 +46,6 @@ where
             label,
             notification,
             hold_to_lock,
-            usb_connected: true,
             loader: Loader::new().with_durations(LOADER_DURATION, LOADER_DURATION / 3),
             pad: Pad::with_background(theme::BG),
             delay: None,
@@ -61,7 +61,7 @@ where
     }
 
     fn paint_notification(&self) {
-        if !self.usb_connected {
+        if !usb_configured() {
             let (color, icon) = Self::level_to_style(0);
             NotificationFrame::<Empty, T>::paint_notification(
                 AREA,
@@ -91,12 +91,13 @@ where
         self.loader.paint()
     }
 
+    pub fn set_paint_notification(&mut self) {
+        self.paint_notification_only = true;
+    }
+
     fn event_usb(&mut self, ctx: &mut EventCtx, event: Event) {
-        if let Event::USB(USBEvent::Connected(is_connected)) = event {
+        if let Event::USB(USBEvent::Connected(_)) = event {
-            if self.usb_connected != is_connected {
+            ctx.request_paint();
-                self.usb_connected = is_connected;
-                ctx.request_paint();
-            }
         }
     }
 
@@ -122,6 +123,7 @@ where
             Event::Timer(token) if Some(token) == self.delay => {
                 self.delay = None;
                 self.pad.clear();
+                self.paint_notification_only = false;
                 self.loader.start_growing(ctx, Instant::now());
             }
             _ => {}

core/embed/rust/trezorhal.h

@@ -9,6 +9,7 @@
 #include "rgb_led.h"
 #include "secbool.h"
 #include "storage.h"
+#include "usb.h"
 
 #include "bip39.h"
 #include "rand.h"

core/src/trezor/ui/layouts/tt_v2/homescreen.py

@@ -17,33 +17,16 @@ class HomescreenBase(RustLayout):
 
     def __init__(self, layout: Any) -> None:
         super().__init__(layout=layout)
-        self.is_connected = True
 
-    async def __iter__(self) -> Any:
+    def _paint(self) -> None:
-        # We need to catch the ui.Cancelled exception that kills us, because that means
+        self.layout.paint()
-        # that we will need to draw on screen again after restart.
-        try:
-            return await super().__iter__()
-        except ui.Cancelled:
-            storage_cache.homescreen_shown = None
-            raise
 
     def _first_paint(self) -> None:
-        from trezor import utils
-
         if storage_cache.homescreen_shown is not self.RENDER_INDICATOR:
             super()._first_paint()
             storage_cache.homescreen_shown = self.RENDER_INDICATOR
-
+        else:
-        # - RENDER_INDICATOR is set -> USB warning is not displayed
-        # - RENDER_INDICATOR is not set -> initially homescreen does not display warning
-        # - usb_checker_task only handles state changes
-        # Here we need to handle the case when homescreen is started with USB disconnected.
-        if not utils.usb_data_connected():
-            msg = self.layout.usb_event(False)
             self._paint()
-            if msg is not None:
-                raise ui.Result(msg)
 
     # In __debug__ mode, ignore {confirm,swipe,input}_signal.
     def create_tasks(self) -> tuple[loop.AwaitableTask, ...]:
@@ -85,11 +68,8 @@ class Homescreen(HomescreenBase):
         usbcheck = loop.wait(io.USB_CHECK)
         while True:
             is_connected = await usbcheck
-            if is_connected != self.is_connected:
+            self.layout.usb_event(is_connected)
-                self.is_connected = is_connected
+            self.layout.paint()
-                self.layout.usb_event(is_connected)
-                self.layout.paint()
-                storage_cache.homescreen_shown = None
 
     def create_tasks(self) -> Tuple[loop.AwaitableTask, ...]:
         return super().create_tasks() + (self.usb_checker_task(),)