clock: Reduce the update rate of the battery meter

In addition to the fix (which is simple) we also modify the button handling
of the simulator because, rather by acident, it relies on the bugs in the
battery meter redraw to ensure the simulator stays active.

wasp/boards/simulator/watch.py

@@ -9,6 +9,8 @@ from machine import SPI
 from drivers.st7789 import ST7789_SPI
 from drivers.vibrator import Vibrator
 
+button = Pin('BUTTON', Pin.IN, quiet=True)
+
 class Backlight(object):
     def __init__(self, level=1):
         self.set(level)
@@ -16,6 +18,8 @@ class Backlight(object):
     def set(self, level):
         print(f'BACKLIGHT: {level}')
 
+        button.value(bool(level))
+
 class Display(ST7789_SPI):
     def __init__(self):
         spi = SPI(0)
@@ -45,10 +49,10 @@ class Battery(object):
 
     def voltage_mv(self):
         if self.voltage > 4:
-            self.step = -0.005
+            self.step = -0.01
             self.powered = False
         elif self.voltage < 3.4:
-            self.step = 0.01
+            self.step = 0.04
             self.powered = True
         self.voltage += self.step
 
@@ -89,5 +93,4 @@ backlight = Backlight()
 battery = Battery()
 rtc = RTC()
 vibrator = Vibrator(Pin('MOTOR', Pin.OUT, value=0), active_low=True)
-button = Pin('BUTTON', Pin.IN, quiet=True)
 

wasp/clock.py

@@ -36,8 +36,9 @@ class ClockApp(object):
     def update(self, watch):
         now = watch.rtc.get_localtime()
         if now[3] == self.on_screen[3] and now[4] == self.on_screen[4]:
-            if now[5] % 2 == 0:
+            if now[5] != self.on_screen[5]:
                 self.meter.update()
+                self.on_screen = now
             return False
 
         display = watch.display