finalized version

src/part1part2.cpp

@@ -0,0 +1,65 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <Arduino.h>
+
+#include "digital_in.h"
+#include "digital_out.h"
+
+class RotaryEncoderDriver {
+    int count{0};
+    bool last_lo{false};
+
+    Digital_out led{5};
+
+    Digital_in eA;
+    Digital_in eB;
+
+public:
+    RotaryEncoderDriver(unsigned short pin_a = 4, unsigned short pin_b = 5) : eA(pin_a), eB(pin_b) {
+        led.init();
+        eA.init();
+        eB.init();
+        last_lo = eA.is_lo();
+    }
+
+    int position() {
+        bool curr_hi = eA.is_hi();
+
+        if (last_lo && curr_hi) {
+            count += eB.is_hi() ? 1 : -1;
+            led.set_hi();
+        } else {
+            led.set_lo();
+        }
+
+        last_lo = !curr_hi;
+        return count;
+    } 
+
+};
+
+int main() {
+    uint8_t cycle{0};
+
+    RotaryEncoderDriver encoder;
+    Serial.begin(9600);
+
+    int prev_pos = encoder.position();
+    while (true) {
+        _delay_us(100);
+        int curr_pos = encoder.position();
+
+        if (cycle++ == 255) {
+            int delta = curr_pos - prev_pos;
+            float rpm = delta * 60.0f / (700.0f * 0.0256f);
+
+            Serial.print("Count: ");
+            Serial.print(delta);
+            Serial.print("\tRPM: ");
+            Serial.println(rpm);
+
+            prev_pos = curr_pos;
+        }
+    }
+    return 0;
+}