Kai Ren / microbit-dal

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Dependencies:   BLE_API mbed-dev-bin nRF51822

Fork of microbit-dal by Lancaster University

Diff: source/drivers/MicroBitAccelerometer.cpp

Revision:
40:948486a56c9d
Parent:
39:112df23f039f
Child:
41:da05ec75cd5d
--- a/source/drivers/MicroBitAccelerometer.cpp	Wed Jul 13 12:18:18 2016 +0100
+++ b/source/drivers/MicroBitAccelerometer.cpp	Wed Jul 13 12:18:20 2016 +0100
@@ -197,6 +197,7 @@
     this->shake.z = 0;
     this->shake.count = 0;
     this->shake.timer = 0;
+    this->shake.freefall = 1;
     this->shake.impulse_3 = 1;
     this->shake.impulse_6 = 1;
     this->shake.impulse_8 = 1;
@@ -421,11 +422,18 @@
         impulseSigma = 0;
     }
 
+    if (force < MICROBIT_ACCELEROMETER_FREEFALL_THRESHOLD && !shake.freefall)
+    {
+        MicroBitEvent e(MICROBIT_ID_GESTURE, MICROBIT_ACCELEROMETER_EVT_FREEFALL);
+        shake.freefall = 1;
+        impulseSigma = 0;
+    }
+
     // Reset the impulse event onve the acceleration has subsided.
     if (impulseSigma < MICROBIT_ACCELEROMETER_GESTURE_DAMPING)
         impulseSigma++;
     else
-        shake.impulse_3 = shake.impulse_6 = shake.impulse_8 = 0;
+        shake.impulse_3 = shake.impulse_6 = shake.impulse_8 = shake.freefall = 0;
 
 
     // Determine what it looks like we're doing based on the latest sample...