toggle PA3

main.c

@@ -1,13 +1,18 @@
-#define F_CPU 5000000UL // 5 MHz
 #include <avr/io.h>
 #include <util/delay.h>
 
-int main(void) {
+#define PA3_SET_MASK 0x08
-    // Configure PA3 as output (Pin 7 on ATTINY202-SSN)
-    VPORTA.DIR |= 8;
 
-    while (1) {
+int main(void)
-        VPORTA.OUT ^= 8;  // toggle PA3
+{
+    VPORTA.DIR = 0x0;
+
+    // Configure PA3 as output (Pin 7 on ATTINY202-SSN)
+    VPORTA.DIR |= PA3_SET_MASK;
+
+    while (1)
+    {
+        VPORTA.OUT ^= PA3_SET_MASK; // toggle PA3
         _delay_ms(500);
     }
 }