rtc: Undo the once-per-second wake up

So... waking up once per second turns out to be a dumb idea because it
regresses the stop watch and HRS tools (which now also only wake up once
per second).

Undo this change but sprinkle a few more micropython.native decorations
on methods used on the wakeup path to minimise power.

Fixes: fb18705b9b ("manager/rtc: Experimental power saving technique")
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

wasp/drivers/battery.py

@@ -4,6 +4,7 @@
 """Generic lithium ion battery driver
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 """
+import micropython
 from machine import Pin, ADC
 
 class Battery(object):
@@ -26,6 +27,7 @@ class Battery(object):
         self._charging = charging
         self._power = power
 
+    @micropython.native
     def charging(self):
         """Get the charging state of the battery.
 

wasp/drivers/nrf_rtc.py

@@ -62,11 +62,11 @@ class RTC(object):
         self.lastcount += split
         self.lastcount &= (1 << 24) - 1   
         uptime = self._uptime
-        self._uptime += split
-        machine.mem32[0x200039c8] = self._uptime * 125
+        uptime += split
+        machine.mem32[0x200039c8] = uptime * 125
+        self._uptime = uptime
 
-        # Has the seconds count changed
-        return bool((self._uptime ^ uptime) & 0x08)
+        return True
 
     def set_localtime(self, t):
         """Set the current wall time.
@@ -117,6 +117,7 @@ class RTC(object):
         """Provide the current uptime in seconds."""
         return self._uptime // 8
 
+    @micropython.native
     def get_uptime_ms(self):
         """Return the current uptime in milliseconds."""
         return self._uptime * 125

wasp/drivers/touch.py

@@ -6,6 +6,7 @@
 """
 
 import array
+import micropython
 import time
 from machine import Pin
 from watch import rtc
@@ -45,6 +46,7 @@ class TouchButton:
         if self.schedule:
             self.schedule(self)
 
+    @micropython.native
     def get_event(self):
         """Receive a touch event.