movement: first crack at background tasks API

1 files changed, 25 insertions, 6 deletions

diff --git a/movement/movement.c b/movement/movement.c
index e1ab322f..5622f17f 100644
--- a/movement/movement.c
+++ b/movement/movement.c
@@ -23,6 +23,18 @@ static inline void _movement_reset_inactivity_countdown() {
     movement_state.timeout_ticks = movement_timeout_inactivity_deadlines[movement_state.settings.bit.to_interval];
 }
 
+void _movement_handle_background_tasks() {
+    for(uint8_t i = 0; i < MOVEMENT_NUM_FACES; i++) {
+        // For each face, if the watch face wants a background task...
+        if (watch_faces[i].wants_background_task != NULL && watch_faces[i].wants_background_task(&movement_state.settings, watch_face_contexts[i])) {
+            // ...we give it one. pretty straightforward!
+            movement_event_t background_event = { EVENT_BACKGROUND_TASK, 0 };
+            watch_faces[i].loop(background_event, &movement_state.settings, watch_face_contexts[i]);
+        }
+    }
+    movement_state.needs_background_tasks_handled = false;
+}
+
 void movement_request_tick_frequency(uint8_t freq) {
     watch_rtc_disable_all_periodic_callbacks();
     movement_state.subsecond = 0;
@@ -68,10 +80,15 @@ void app_setup() {
             watch_face_contexts[i] = NULL;
             is_first_launch = false;
         }
+
+        // set up the 1 minute alarm (for background tasks and low power updates)
+        watch_date_time alarm_time;
+        alarm_time.reg = 0;
+        alarm_time.unit.second = 59; // after a match, the alarm fires at the next rising edge of CLK_RTC_CNT, so 59 seconds lets us update at :00
+        watch_rtc_register_alarm_callback(cb_alarm_fired, alarm_time, ALARM_MATCH_SS);
     }
     if (movement_state.le_mode_ticks != -1) {
         watch_disable_extwake_interrupt(BTN_ALARM);
-        watch_rtc_disable_alarm_callback();
 
         watch_enable_external_interrupts();
         watch_register_interrupt_callback(BTN_MODE, cb_mode_btn_interrupt, INTERRUPT_TRIGGER_BOTH);
@@ -131,13 +148,12 @@ bool app_loop() {
         event.event_type = EVENT_TIMEOUT;
     }
 
+    // handle background tasks, if the alarm handler told us we need to
+    if (movement_state.needs_background_tasks_handled) _movement_handle_background_tasks();
+
     // if we have timed out of our low energy mode countdown, enter low energy mode.
     if (movement_state.le_mode_ticks == 0) {
         movement_state.le_mode_ticks = -1;
-        watch_date_time alarm_time;
-        alarm_time.reg = 0;
-        alarm_time.unit.second = 59; // after a match, the alarm fires at the next rising edge of CLK_RTC_CNT, so 59 seconds lets us update at :00
-        watch_rtc_register_alarm_callback(cb_alarm_fired, alarm_time, ALARM_MATCH_SS);
         watch_register_extwake_callback(BTN_ALARM, cb_alarm_btn_extwake, true);
         event.event_type = EVENT_NONE;
         event.subsecond = 0;
@@ -145,6 +161,9 @@ bool app_loop() {
         // this is a little mini-runloop.
         // as long as le_mode_ticks is -1 (i.e. we are in low energy mode), we wake up here, update the screen, and go right back to sleep.
         while (movement_state.le_mode_ticks == -1) {
+            // we also have to handle background tasks here in the mini-runloop
+            if (movement_state.needs_background_tasks_handled) _movement_handle_background_tasks();
+
             event.event_type = EVENT_LOW_ENERGY_UPDATE;
             watch_faces[movement_state.current_watch_face].loop(event, &movement_state.settings, watch_face_contexts[movement_state.current_watch_face]);
             watch_enter_sleep_mode();
@@ -202,7 +221,7 @@ void cb_alarm_btn_extwake() {
 }
 
 void cb_alarm_fired() {
-    event.event_type = EVENT_LOW_ENERGY_UPDATE;
+    movement_state.needs_background_tasks_handled = true;
 }
 
 void cb_tick() {