diff --git a/src/apps/homescreen/layout_homescreen.py b/src/apps/homescreen/layout_homescreen.py
index 861a216f..d9576869 100644
--- a/src/apps/homescreen/layout_homescreen.py
+++ b/src/apps/homescreen/layout_homescreen.py
@@ -1,34 +1,29 @@
-import utime
-
 from trezor import ui
 from trezor import loop
-from trezor import layout
-from trezor import utils
+
 
 def layout_homescreen():
     print("Homescreen layout!")
 
+    # ui.display.bar(0, 0, 240, 240, ui.WHITE)
+
+    # f = open('apps/homescreen/trezor.toig', 'r')
+
+    # def func(foreground):
+    #     f.seek(0)
+    #     ui.display.icon(0, 0, f.read(), foreground, ui.BLACK)
+
+    # animation = ui.animate_pulse(func, ui.WHITE, ui.GREY, speed=400000)
+
+    timeout = loop.sleep(1000 * 1000)
+
+    yield loop.wait([timeout])
+    print('back to layout')
+
+    # try:
+    #     print(animation.throw(StopIteration()))
+    # except:
+    #     pass
+
     # from apps import playground
-    # loop.call_at(utime.ticks_us() + 5 * 1000000, layout.change(playground.layout_tap_to_confirm('1BitkeyP2nDd5oa64x7AjvBbbwST54W5Zmx2', 110.126967, 'BTC')))
-
-    ui.display.bar(0, 0, 240, 240, ui.WHITE)
-
-    f = open('apps/homescreen/trezor.toig', 'r')
-
-    def func(foreground):
-        f.seek(0)
-        ui.display.icon(0, 0, f.read(), foreground, ui.BLACK)
-
-    animation = ui.animate_pulse(func, ui.WHITE, ui.GREY, speed=400000)
-
-    timeout = loop.sleep(3 * 1000000)
-
-    yield from loop.wait([timeout, animation])
-
-    try:
-        print(animation.throw(StopIteration()))
-    except:
-        pass
-
-    from apps import playground
-    return playground.layout_tap_to_confirm('1BitkeyP2nDd5oa64x7AjvBbbwST54W5Zmx2', 110.126967, 'BTC')
+    # return playground.layout_tap_to_confirm('1BitkeyP2nDd5oa64x7AjvBbbwST54W5Zmx2', 110.126967, 'BTC')
diff --git a/src/trezor/layout.py b/src/trezor/layout.py
index a6bf9271..0d5c6c12 100644
--- a/src/trezor/layout.py
+++ b/src/trezor/layout.py
@@ -1,8 +1,8 @@
 import sys
 import utime
-from . import utils
 
 from . import log
+from . import utils
 
 _new_layout = None
 _current_layout = None
diff --git a/src/trezor/loop.py b/src/trezor/loop.py
index a8b93665..25a64a6f 100644
--- a/src/trezor/loop.py
+++ b/src/trezor/loop.py
@@ -11,10 +11,14 @@ EVT_TMOVE = const(-2)
 EVT_TEND = const(-3)
 EVT_MSG = const(-4)
 
-evt_handlers = { EVT_TSTART: None,
-                 EVT_TMOVE: None,
-                 EVT_TEND: None,
-                 EVT_MSG: None, }
+DO_NOTHING = const(-5)
+
+evt_handlers = {
+    EVT_TSTART: None,
+    EVT_TMOVE: None,
+    EVT_TEND: None,
+    EVT_MSG: None,
+}
 time_queue = []
 
 if __debug__:
@@ -32,30 +36,47 @@ def __call_at(time, gen):
         time = utime.ticks_us()
     heappush(time_queue, (time, gen))
 
-def __wait_gen(gen, cb):
-    if isinstance(gen, int):
-        ret = yield gen
 
-    else:
+def __wait_for_gen(gen, cb):
+    if isinstance(gen, type_gen):
         ret = yield from gen
+    else:
+        ret = yield gen
+    try:
+        cb.throw(StopIteration)
+    except Exception as e:
+        log.info(__name__, '__wait_gen throw raised %s', e)
 
-    cb.throw(StopIteration())
+    log.info(__name__, '__wait_gen returning %s', ret)
 
 
-def __wait_cb():
-    while True:
+class __Wait():
+    pass
+
+
+def __wait_callback(call_after):
+    # TODO: rewrite as instance of __Wait instead of generator
+    delegate = yield
+    received = 0
+    while received < call_after:
         try:
-            yield sleep(1000000)
+            yield
         except StopIteration:
-            break
+            received += 1
+    __call_at(None, delegate)
 
-def wait(gens):
-    cb = __wait_cb()
-    cb.send(None)
 
+def wait_for_first(gens):
+    cb = __wait_callback(1)
     for g in gens:
-        __call_at(None, __wait_gen(g, cb))
+        __call_at(None, __wait_for_gen(g, cb))
+    return cb
 
+
+def wait_for_all(gens):
+    cb = __wait_callback(len(gens))
+    for g in gens:
+        __call_at(None, __wait_for_gen(g, cb))
     return cb
 
 
@@ -99,9 +120,12 @@ def run_forever(start_gens):
 
         try:
             ret = gen.send(None)
+
         except StopIteration as e:
+            log.info(__name__, '%s ended', gen)
             # gen ended, forget it and go on
             continue
+
         except Exception as e:
             log.exception(__name__, e)
             continue
@@ -114,9 +138,14 @@ def run_forever(start_gens):
                 # wait for event
                 raise NotImplementedError()
 
+        elif isinstance(ret, type_gen):
+            log.info(__name__, 'Scheduling %s -> %s', gen, ret)
+            ret.send(None)
+            ret.send(gen)
+
         elif ret is None:
             # just call us asap
             __call_at(None, gen)
-        else:
 
-            raise Exception("Unhandled result %s" % gen)
+        else:
+            raise Exception("Unhandled result %s by %s" % (ret, gen))