Feature/lowpass filter (#210)

* #173: casual lowpass filter

* #173: finalized file location

* #173: Added a simple_ema.h file

* added void to function line

.pre-commit-config.yaml

@@ -1,10 +1,10 @@
-repos:
-    - repo: local
-      hooks:
-        - id: clang_restage
-          name: Restage formatted files
-          entry: clang_restage
-          language: system
-          pass_filenames: false
-          always_run: true
+repos:
+    - repo: local
+      hooks:
+        - id: clang_restage
+          name: Restage formatted files
+          entry: clang_restage
+          language: system
+          pass_filenames: false
+          always_run: true
           stages: [pre-commit]

middleware/simple_ema.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+#include "simple_ema.h"
+
+void ema_filter(float current_value, float *previous_ema, float alpha)
+{
+	*previous_ema =
+		(alpha * current_value) + ((1 - alpha) * (*previous_ema));
+}

middleware/simple_ema.h

@@ -0,0 +1,7 @@
+#ifndef SIMPLE_EMA
+#define SIMPLE_EMA
+
+// Exponential Moving Average Lowpass Filter
+void ema_filter(float current_value, float *previous_ema, float alpha);
+
+#endif /* SIMPLE_EMA */