movement: store settings in BKUP to persist across resets

4 files changed, 9 insertions, 5 deletions

diff --git a/movement/movement.c b/movement/movement.c
index 1a31175a..128011b9 100644
--- a/movement/movement.c
+++ b/movement/movement.c
@@ -114,10 +114,12 @@ void app_init() {
 }
 
 void app_wake_from_backup() {
-    // This app does not support BACKUP mode.
+    movement_state.settings.reg = watch_get_backup_data(0);
 }
 
 void app_setup() {
+    watch_store_backup_data(movement_state.settings.reg, 0);
+
     static bool is_first_launch = true;
 
     if (is_first_launch) {
diff --git a/movement/movement.h b/movement/movement.h
index 4e791fca..0379fe7b 100644
--- a/movement/movement.h
+++ b/movement/movement.h
@@ -13,12 +13,12 @@
 //   stored in BKUP[1] and BKUP[2], respectively.
 // * The movement_reserved_t type is here as a placeholder, because I sense there's some other generally useful
 //   stuff we'll want to make available to all watch faces and stash in the BKUP[3] register.
-// Anyway: Eventually, if Movement supports the BACKUP sleep mode, this will allow these preferences to be stored
-// before entering BACKUP mode and and restored after waking from reset.
+// This allows these preferences to be stored before entering BACKUP mode and and restored after waking from reset.
 
 // movement_settings_t contains global settings that cover watch behavior, including preferences around clock and unit
-// display, time zones, buzzer behavior, LED color and low energy mode timeouts.
-// Eventually it will be stored in BKUP[0] when Movement enters BACKUP mode.
+// display, time zones, buzzer behavior, LED color and low energy mode timeouts. These settings are stored in BKUP[0].
+// If your watch face changes one of these settings, you should store your changes in either your loop or resign
+// function by calling `watch_store_backup_data(settings->reg, 0)`. Otherwise it may not persist after a reset event.
 typedef union {
     struct {
         bool button_should_sound : 1;       // if true, pressing a button emits a sound.
diff --git a/movement/watch_faces/settings/preferences_face.c b/movement/watch_faces/settings/preferences_face.c
index afe71034..03a58834 100644
--- a/movement/watch_faces/settings/preferences_face.c
+++ b/movement/watch_faces/settings/preferences_face.c
@@ -165,4 +165,5 @@ void preferences_face_resign(movement_settings_t *settings, void *context) {
     (void) context;
     watch_set_led_off();
     movement_request_tick_frequency(1);
+    watch_store_backup_data(settings->reg, 0);
 }
diff --git a/movement/watch_faces/settings/set_time_face.c b/movement/watch_faces/settings/set_time_face.c
index fd414279..0f5af312 100644
--- a/movement/watch_faces/settings/set_time_face.c
+++ b/movement/watch_faces/settings/set_time_face.c
@@ -123,4 +123,5 @@ void set_time_face_resign(movement_settings_t *settings, void *context) {
     (void) context;
     watch_set_led_off();
     movement_request_tick_frequency(1);
+    watch_store_backup_data(settings->reg, 0);
 }