initial avr projects (blink + interrupts)

LED Blink Input Output/main.c

@@ -0,0 +1,28 @@
+#include "delay.h"
+
+int main(void) {
+  // PC2 as output (LED), PC3 as input (button)
+  timer1_init();
+
+  DDRB |= (1<<PB2);
+  DDRB &= ~(1<<PB3);
+
+  // enable internal pull-up on PC3 (important)
+  PORTB |= (1<<PB3);
+
+  timer1_init();
+
+  while(1) {
+    // Button pressed -> pin reads LOW because of pull-up
+    if (PINB & (1<<PB3)) {
+      for (int i=0;i<=20;i++){
+      PORTB |= (1<<PB2);      // LED ON
+      delay_ms(200);
+      PORTB &= ~(1<<PB2);
+      delay_ms(200);
+     }
+    } else {
+      PORTB &= ~(1<<PB2);     // LED OFF
+    }
+  }
+}