Some more changes.

src/include/timer.h

@@ -0,0 +1,3 @@
+void initCtcTimer0(void);
+void initOverflowTimer0(void);
+void initOverflowTimer1(void);

src/include/uart.h

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+void uart_init(unsigned int baud);
+void uart_sendByte(uint8_t byte);
+int uart_printf(char var, FILE *stream);

src/timer.c

@@ -0,0 +1,37 @@
+#include <avr/io.h>
+#include "include/timer.h"
+
+void initCtcTimer0(void)
+{
+	/* Initialize counter 0 */
+	TCNT0 = 0;
+
+	/* Enable Counter0 Compare Match A Interrupt */
+	TIMSK0 |= (1 << OCIE0A);
+	
+	/* Select clock. Prescaler of 1024 */
+	TCCR0B |= (1 << CS02) | (1 << CS00);
+	
+	/* Use CTC Mode */
+	TCCR0A |= (1 << WGM01);
+
+	/* 
+	 * OCR0A contains TOP value for counter:
+	 */
+	OCR0A = 78;
+}
+
+void initOverflowTimer0(void)
+{
+	/* Prescaler = 0 */
+	TCCR0B |= (1<<CS00);
+
+	/* Enable Timer Overflow Interrupt */
+	TIMSK0 |= (1<<TOIE0);
+}
+
+void initOverflowTimer1(void)
+{
+	TCCR1B |= (1<<CS11);
+	TIMSK1 |= (1<<TOIE1);
+}

src/uart.c

@@ -0,0 +1,38 @@
+#include <avr/io.h>
+
+#include "include/uart.h"
+
+static FILE stream = FDEV_SETUP_STREAM(uart_printf, NULL, _FDEV_SETUP_WRITE);
+
+void uart_init(unsigned int baud)
+{
+    stdout = &stream;
+    
+	/* Set baud rate */
+	UBRR1H = (unsigned char)(baud>>8);
+	UBRR1L = (unsigned char)baud;
+	
+	/* Enable receiver and transmitter */
+	UCSR1B = (1<<RXEN1)|(1<<TXEN1);
+
+	/* Set frame format */
+	UCSR1C |= (3<<UCSZ10); // 8 data bits
+	// UCSR1C &= ~(1<<USBS1); // 1 stop bit
+}
+
+void uart_sendByte(uint8_t byte)
+{
+	/* Wait for empty transmit buffer */
+	while (!(UCSR1A & (1<<UDRE1)))
+	{
+	}
+
+	/* Put data into buffer, sends the data */
+	UDR1 = byte;
+}
+
+int uart_printf(char var, FILE *stream)
+{
+	uart_sendByte(var);
+	return 0;
+}