accel: Stop polling

Use freefall interrupts instead. This drop the fancy horizon/shake detection
algorithms, but it works surprisingly well and is way more energy-efficient.

Shake detection is a little too sensitive imo and horizon detection needs some
tweaking too.

1 files changed, 2 insertions, 4 deletions

diff --git a/accel.h b/accel.h
index edb2540..fcaaafd 100644
--- a/accel.h
+++ b/accel.h
@@ -13,11 +13,9 @@ typedef uint8_t horizon;
 void accelInit ();
 void accelStart ();
 void accelProcess ();
-int8_t accelGetZ ();
-int8_t accelGetNormalizedZ ();
-uint8_t accelGetShakeCount ();
+horizon accelGetHorizon (bool * const);
 void accelResetShakeCount ();
-horizon accelGetHorizon ();
+uint8_t accelGetShakeCount ();
 
 #endif /* ACCEL_H */