create ex02

module00/ex02/main.c

@@ -0,0 +1,41 @@
+#include <avr/io.h>
+
+#define SET(REGISTER, BIT)		REGISTER |= 1 << BIT
+#define CLEAR(REGISTER, BIT)	REGISTER &= ~(1 << BIT)
+#define TEST(REGISTER, BIT)		REGISTER & 1 << BIT
+#define TOGGLE(REGISTER, BIT)	REGISTER ^= 1 << BIT
+
+#define D1 0
+#define D2 1
+#define D3 2
+#define D4 4
+
+int main()
+{
+    // DDRx : select direction of the pin
+    //      - 1 = output (pull-up off)
+    //      - 0 = input
+    // PORTx :
+    //      if DDRx = 1 (output mode) :
+    //      - 1 = HIGH (5V)
+    //      - 0 = LOW (0V)
+    //      if DDRx = 0 (input mode) : 
+    //      - 1 = pull-up on
+    //      - 0 = pull-up off
+    // PINx : 
+
+
+    SET(DDRB, D1);		// make PB0 as OUTPUT (pullup is off)
+    CLEAR(PORTB, D1);	// make PB0 as HIGH (LED turns ON)
+
+    // SET(DDRB, D2);		// make PB1 as OUTPUT (pullup is off)
+    // CLEAR(PORTB, D2);	// make PB1 as LOW (LED turns OFF)
+
+    // CLEAR(DDRB, D3);		// make PB2 as INPUT
+    // SET(PORTB, D3);		// make PB2 pullup on
+
+    // CLEAR(DDRB, D4);		// make PB4 as INPUT
+    // CLEAR(PORTB, D4);	// make PB4 pullup off
+
+    return 0;
+}