From 27d300f2273821dad2705c72a540b910f975786a Mon Sep 17 00:00:00 2001
From: Martin Brodbeck <martin@brodbeck-online.de>
Date: Wed, 6 Mar 2024 10:53:16 +0100
Subject: [PATCH] smoothing calcWPM

---
 src/utils.cpp | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/utils.cpp b/src/utils.cpp
index 617b7ba..cd1a112 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -8,9 +8,23 @@
 
 uint8_t calcWPM(float percent, uint8_t wpmMin, uint8_t wpmMax)
 {
+    static float lastPercent {0};
+    static float lastResult {0};
+
     auto wpm = (percent * (wpmMax - wpmMin) / 100) + wpmMin;
     uint8_t result = static_cast<uint8_t>(std::round(wpm));
-    return result;
+
+    float amountChanged = std::abs(percent - lastPercent);
+
+    // Only change WPM if poti value change was big enough
+    // (Preventing rapid WPM jumps back and forth.)
+    if (amountChanged > 0.6) {
+        lastPercent = percent;
+        lastResult = result;
+        return result;
+    } else {
+        return lastResult;
+    };
 }
 
 float potiRead()