motioncontroller: Add functions for analysis

These are functions for converting acceleration due to gravity to angles
in degrees, and some statistical analysis including the mean and
variance.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/utility/Math.h b/src/utility/Math.h
new file mode 100644
index 00000000..e8d190c7
--- /dev/null
+++ b/src/utility/Math.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <cstdint>
+
+namespace Pinetime {
+  namespace Utility {
+    // returns the arcsin of `arg`. asin(-32767) = -90, asin(32767) = 90
+    int16_t Asin(int16_t arg);
+  }
+}