Adding Project 1 rotary encoder implementations

Project_1_Rotary_Encoder/Part_2_UART/src/digital_in.cpp

@@ -0,0 +1,26 @@
+#include <digital_in.h>
+#include <avr/io.h>
+
+Digital_in::Digital_in(int pin)
+{
+    pinMask = static_cast<uint8_t>(1U << pin);
+}
+
+void Digital_in::init()
+{
+    // Configure pin as input
+    DDRB &= static_cast<uint8_t>(~pinMask);
+
+    // Enable internal pull-up resistor
+    PORTB |= pinMask;
+}
+
+bool Digital_in::is_hi()
+{
+    return (PINB & pinMask) != 0;
+}
+
+bool Digital_in::is_lo()
+{
+    return (PINB & pinMask) == 0;
+}

Project_1_Rotary_Encoder/Part_2_UART/src/digital_out.cpp

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+#include <digital_out.h>
+#include <avr/io.h>
+
+Digital_out::Digital_out(int pin)
+{
+    pinMask = static_cast<uint8_t>(1U << pin);
+}
+
+void Digital_out::init()
+{
+    DDRB |= pinMask;
+}
+
+void Digital_out::set_hi()
+{
+    PORTB |= pinMask;
+}
+
+void Digital_out::set_lo()
+{
+    PORTB &= static_cast<uint8_t>(~pinMask);
+}
+
+void Digital_out::toggle()
+{
+    PORTB ^= pinMask;
+}

Project_1_Rotary_Encoder/Part_2_UART/src/encoder.cpp

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+#include <encoder.h>
+
+Encoder::Encoder(int c1Pin, int c2Pin, int ledPin)
+    : c1(c1Pin), c2(c2Pin), led(ledPin),
+      previousC1(false), count(0)
+{
+}
+
+void Encoder::init()
+{
+    c1.init();
+    c2.init();
+    led.init();
+
+    led.set_lo();
+
+    previousC1 = c1.is_hi();
+    count = 0;
+}
+
+void Encoder::update()
+{
+    led.set_lo();
+
+    bool currentC1 = c1.is_hi();
+
+    if (currentC1 != previousC1)
+    {
+        bool currentC2 = c2.is_hi();
+
+        if (currentC1 == currentC2)
+        {
+            count++;
+        }
+        else
+        {
+            count--;
+        }
+
+        previousC1 = currentC1;
+        led.set_hi();
+    }
+}
+
+int Encoder::position()
+{
+    return count;
+}

Project_1_Rotary_Encoder/Part_2_UART/src/main.cpp

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+#include <Arduino.h>
+#include <encoder.h>
+
+int main()
+{
+    init();
+
+    Encoder encoder(0, 1, 5);
+
+    encoder.init();
+
+    Serial.begin(9600);
+
+    while (1)
+    {
+        encoder.update();
+
+        Serial.println(encoder.position());
+    }
+
+    return 0;
+}