wasp: manager: Start refining the application interface

This is the first step in starting to formalize the seperation of
applications from the system manager.

1 files changed, 34 insertions, 4 deletions

diff --git a/wasp/manager.py b/wasp/manager.py
index 2c9ab8c..879c3f2 100644
--- a/wasp/manager.py
+++ b/wasp/manager.py
@@ -2,21 +2,51 @@ import clock
 import gc
 import machine
 
+EVENT_TICK = 0x100
+EVENT_KEYMASK = 0xff
+
 class Manager(object):
     def __init__(self, watch):
         self.watch = watch
+
+        self.app = None
         self.switch(clock.ClockApp())
         self.sleep_at = watch.rtc.uptime + 90
         self.charging = True
 
     def switch(self, app):
+        if self.app:
+            self.app.background(self)
+
+        # Clear out any configuration from the old application
+        self.tick_period_ms = 0
+        self.tick_expiry = None
+
         self.app = app
-        app.draw(self.watch)
+        app.foreground(self)
+
+    def request_tick(self, period_ms=None):
+        """Request (and subscribe to) a periodic tick event.
+
+        Note: With the current simplistic timer implementation sub-second
+        tick intervals are not possible.
+        """
+        self.tick_period_ms = period_ms
+        self.tick_expiry = self.watch.rtc.get_uptime_ms() + period_ms
 
     def tick(self):
+        rtc = self.watch.rtc
+
         if self.sleep_at:
-            if self.watch.rtc.update():
-                self.app.update(self.watch)
+            if rtc.update() and self.tick_expiry:
+                now = rtc.get_uptime_ms()
+
+                if self.tick_expiry <= now:
+                    ticks = 0
+                    while self.tick_expiry <= now:
+                        self.tick_expiry += self.tick_period_ms
+                        ticks += 1
+                    self.app.tick(ticks)
 
             if self.watch.button.value():
                 self.sleep_at = self.watch.rtc.uptime + 15
@@ -34,7 +64,7 @@ class Manager(object):
             charging = self.watch.battery.charging()
             if self.watch.button.value() or self.charging != charging:
                 self.watch.display.poweron()
-                self.app.update(self.watch)
+                self.app.tick(None)
                 self.watch.backlight.set(2)
 
                 self.sleep_at = self.watch.rtc.uptime + 15