added button handling via interrupts

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/main.cpp

@@ -3,10 +3,12 @@ extern void init();
 extern void loop();
 
 //#include "blink/blink.h"
-#include "button_poll/button.h"
+//#include "button_poll/button.h"
+#include "button_interupt/button.h"
 
 //#define BLINK
-#define BUTTON_POLL
+//#define BUTTON_POLL
+#define BUTTON_INTERRUPT
 
 int main() {
     init();