From e62be3b12d3c94d709a77d89f52c31f7c4ac475d Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 4 Dec 2021 22:22:47 -0800
Subject: Initial commit.

---
 arduino/Counter.cc | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100755 arduino/Counter.cc

(limited to 'arduino/Counter.cc')

diff --git a/arduino/Counter.cc b/arduino/Counter.cc
new file mode 100755
index 0000000..abf7c27
--- /dev/null
+++ b/arduino/Counter.cc
@@ -0,0 +1,98 @@
+#include "Counter.h"
+
+#include <Arduino.h>
+
+void Counter::init (unsigned long startDelay, unsigned long rpmCount, unsigned long signalsPerRPM)
+{
+    this->startDelay    = startDelay;
+    this->rpmCount      = rpmCount;
+    this->signalsPerRPM = signalsPerRPM;
+    reset();
+}
+
+void Counter::setStartDelay (unsigned long val)
+{
+    startDelay = val;
+}
+
+void Counter::setRPMCount (unsigned long val)
+{
+    rpmCount = val;
+}
+
+void Counter::setSignalsPerRPM (unsigned long val)
+{
+    signalsPerRPM = val;
+}
+
+void Counter::start (unsigned long startTime)
+{
+    if (state == READY)
+    {
+        this->startTime = startTime;
+        state = WAITING_FOR_TIMEOUT;
+    }
+}
+
+void Counter::reset ()
+{
+    state = READY;
+}
+
+void Counter::update (unsigned long t, int rpmSignal)
+{
+    switch (state)
+    {
+    case WAITING_FOR_TIMEOUT:
+    {
+        if (t - startTime >= startDelay)
+        {
+            startTime = t; // Update start time for counting state
+            signals = 0;
+            state = COUNTING;
+        }
+        break;
+    }
+    case COUNTING:
+    {
+        // Count signals in 1 second intervals
+        if (lastRpmSignal != rpmSignal && rpmSignal == HIGH)
+        {
+            signals++;
+        }
+        // 1 second interval reached
+        if (t - startTime >= 1000)
+        {
+            float rpm = ((float) signals / (float) signalsPerRPM) * 60.0f;
+            if (rpm <= rpmCount)
+            {
+                startTime = t; // Update start time for signaling state
+                state = SIGNALING;
+            }
+            else
+            {
+                // RPM threshold not reached.
+                // Count signals per second from scratch.
+                //Serial.print("rpm: \r\n"); Serial.print(rpm); Serial.print("\r\n");
+                startTime = t;
+                signals = 0;
+            }
+        }
+        break;
+    }
+    case SIGNALING:
+    {
+        if (t - startTime >= 3000)
+        {
+            state = READY;
+        }
+    }
+    default: break;
+    }
+    lastRpmSignal = rpmSignal;
+}
+
+Counter::State Counter::getState () const
+{
+    return state;
+}
-- 
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