From 5c2cc7ebf8caaefb362f23564e110af8f49bc79a Mon Sep 17 00:00:00 2001
From: Phil Howard <phil@gadgetoid.com>
Date: Fri, 25 Mar 2022 14:55:56 +0000
Subject: [PATCH] Badger2040: Improve launcher.

---
 micropython/examples/badger2040/badger_os.py |  2 ++
 micropython/examples/badger2040/image.py     |  2 +-
 micropython/examples/badger2040/launcher.py  | 16 ++++++++--------
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/micropython/examples/badger2040/badger_os.py b/micropython/examples/badger2040/badger_os.py
index ef2a1e20..928cfa8e 100644
--- a/micropython/examples/badger2040/badger_os.py
+++ b/micropython/examples/badger2040/badger_os.py
@@ -54,7 +54,9 @@ def state_running():
 
 
 def state_clear_running():
+    running = state_running()
     state_modify("launcher", {"running": "launcher"})
+    return running != "launcher"
 
 
 def state_set_running(app):
diff --git a/micropython/examples/badger2040/image.py b/micropython/examples/badger2040/image.py
index ccaf01e5..db31fc15 100644
--- a/micropython/examples/badger2040/image.py
+++ b/micropython/examples/badger2040/image.py
@@ -94,7 +94,7 @@ if TOTAL_IMAGES == 0:
 
 badger_os.state_load("image", state)
 
-changed = not display.woken()
+changed = not badger2040.woken_by_button()
 
 
 while True:
diff --git a/micropython/examples/badger2040/launcher.py b/micropython/examples/badger2040/launcher.py
index 5c33b892..14b94593 100644
--- a/micropython/examples/badger2040/launcher.py
+++ b/micropython/examples/badger2040/launcher.py
@@ -10,9 +10,13 @@ import badger_os
 # Reduce clock speed to 48MHz, that's fast enough!
 machine.freq(48000000)
 
+changed = False
+exited_to_launcher = False
+woken_by_button = badger2040.woken_by_button()  # Must be done before we clear_pressed_to_wake
+
 if badger2040.pressed_to_wake(badger2040.BUTTON_A) and badger2040.pressed_to_wake(badger2040.BUTTON_C):
     # Pressing A and C together at start quits app
-    badger_os.state_clear_running()
+    exited_to_launcher = badger_os.state_clear_running()
     badger2040.clear_pressed_to_wake()
 else:
     # Otherwise restore previously running app
@@ -33,7 +37,8 @@ state = {
 }
 
 badger_os.state_load("launcher", state)
-changed = state["running"] != "launcher"
+
+display.invert(state["inverted"])
 
 icons = bytearray(launchericons.data())
 icons_width = 576
@@ -206,16 +211,11 @@ def button(pin):
             render()
 
 
-if changed:
-    # Wait for any wakeup button to be released
-    while display.pressed(badger2040.BUTTON_A) or display.pressed(badger2040.BUTTON_B) or display.pressed(badger2040.BUTTON_C) or display.pressed(badger2040.BUTTON_UP) or display.pressed(badger2040.BUTTON_DOWN):
-        time.sleep(0.01)
+if exited_to_launcher or not woken_by_button:
     display.update_speed(badger2040.UPDATE_MEDIUM)
     render()
 
 display.update_speed(badger2040.UPDATE_FAST)
-if not changed and not display.woken():
-    render()
 
 while True:
     if display.pressed(badger2040.BUTTON_A):