added example for controlling a traffic light

.gitignore

@@ -0,0 +1 @@
+.pio

platformio.ini

@@ -0,0 +1,14 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:nanoatmega328]
+platform = atmelavr
+board = nanoatmega328
+framework = arduino

src/button_interupt/button.cpp

@@ -0,0 +1,47 @@
+//
+// Created by servostar on 27.10.23.
+//
+
+#include "button.h"
+
+#ifdef BUTTON_INTERRUPT
+
+ISR(INT0_vect)
+{
+    PORTB = 0;
+}
+
+ISR(INT1_vect)
+{
+    PORTB = 0xff;
+}
+
+void init() {
+    // set B as output
+    DDRB = 0xff;
+    PORTB = 0x00;
+
+    // set Port D to input (bit 2/3, remember bit 0/1 are for UART)
+    SET_INPUT(DDRD, DDD2);
+    SET_INPUT(DDRD, DDD3);
+    // put 5V on input (make it pull up resistor)
+    SET_BIT(PORTD, DDD2);
+    SET_BIT(PORTD, DDD3);
+
+    // configure interrupt mode
+    SET_INTERRUPT_MODE(0, FALLING);
+    SET_INTERRUPT_MODE(1, FALLING);
+
+    // enable interrupt 0 and 1
+    ENABLE_INTERRUPT(0);
+    ENABLE_INTERRUPT(1);
+
+    // enable interrupts globally
+    sei();
+}
+
+void loop() {
+
+}
+
+#endif

src/button_interupt/button.h

@@ -0,0 +1,13 @@
+//
+// Created by servostar on 27.10.23.
+//
+
+#ifndef ARDUINO_BUTTON_H
+#define ARDUINO_BUTTON_H
+
+#include "prelude.h"
+
+void init();
+void loop();
+
+#endif //ARDUINO_BUTTON_H

src/button_poll/button.cpp

@@ -0,0 +1,47 @@
+//
+// Created by servostar on 27.10.23.
+//
+
+#include "button.h"
+
+// ---------------------------------------
+//
+// DDR set bit of port to either input or output
+// PORTx set bit of port value
+// PINx read voltage of bit of port D
+
+#ifdef BUTTON_POLL
+
+void init() {
+    // ---------------------------------------
+    // set Port B to output
+    // we will write through B5
+    SET_OUTPUT(DDRB, DDB5);
+    CLR_BIT(PORTB, DDB5);
+
+    // ---------------------------------------
+    // setup input port
+    // we will read through D2/D3
+
+    // set Port D to input (bit 2/3, remember bit 0/1 are for UART)
+    SET_INPUT(DDRD, DDD2);
+    SET_INPUT(DDRD, DDD3);
+    // put 5V on input (make it pull up resistor)
+    SET_BIT(PORTD, DDD2);
+    SET_BIT(PORTD, DDD3);
+}
+
+void loop() {
+
+    // poll voltage of pin 2 of port D
+    if (!GET_BIT(PIND, PIND2)) {
+        SET_BIT(PORTB, DDB5);
+    }
+
+    // poll voltage of pin 3 of port D
+    if (!GET_BIT(PIND, PIND3)) {
+        CLR_BIT(PORTB, DDB5);
+    }
+}
+
+#endif

src/button_poll/button.h

@@ -0,0 +1,13 @@
+//
+// Created by servostar on 27.10.23.
+//
+
+#ifndef ARDUINO_BUTTON_H
+#define ARDUINO_BUTTON_H
+
+#include "prelude.h"
+
+void init();
+void loop();
+
+#endif //ARDUINO_BUTTON_H

src/main.cpp

@@ -2,9 +2,15 @@
 extern void init();
 extern void loop();
 
-#include "blink/blink.h"
+//#include "blink/blink.h"
+//#include "button_poll/button.h"
+//#include "button_interupt/button.h"
+#include "trafficlight/trafficlight.h"
 
-#define BLINK
+//#define BLINK
+//#define BUTTON_POLL
+//#define BUTTON_INTERRUPT
+#define TRAFFIC_LIGHT
 
 int main() {
     init();

src/trafficlight/trafficlight.cpp

@@ -0,0 +1,34 @@
+//
+// Created by servostar on 27.10.23.
+//
+
+#include "trafficlight.h"
+
+#ifdef TRAFFIC_LIGHT
+
+void init() {
+    // set Port B bit 0,1,2 to output mode
+    DDRB = 0b00000111;
+
+    // set port B bit 2 (red) to one
+    PORTB = 0b00000100;
+}
+
+void loop() {
+    _delay_ms(200);
+    // set red orange
+    PORTB ^= 0b00000010;
+    _delay_ms(200);
+
+    // set green
+    PORTB ^= 0b00000111;
+    _delay_ms(500);
+
+    // set orange
+    PORTB ^= 0b00000011;
+    _delay_ms(500);
+
+    // set to red
+    PORTB ^= 0b00000110;
+}
+#endif

src/trafficlight/trafficlight.h

@@ -0,0 +1,13 @@
+//
+// Created by servostar on 27.10.23.
+//
+
+#ifndef ARDUINO_TRAFFICLIGHT_H
+#define ARDUINO_TRAFFICLIGHT_H
+
+#include "prelude.h"
+
+void init();
+void loop();
+
+#endif //ARDUINO_TRAFFICLIGHT_H