Started following some tutorial on att85 usi. Downloaded example code from make avr book.

Make AVR Examples/Chapter11_Driving-Servo-Motors/servoSundial/servoSundial.h

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+                           /* Quasi-realtime-clock with servo sundial. */
+
+// ------- Includes -------- //
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include <avr/power.h>
+#include "pinDefines.h"
+#include "USART.h"
+
+// Global variables that take care of clock
+extern volatile uint16_t ticks;
+extern volatile uint8_t hours;                 /* arbitrary default time */
+extern volatile uint8_t minutes;
+extern volatile uint8_t seconds;
+
+// ------- Defines -------- //
+#define PULSE_MIN         1000         /* experiment with these values */
+#define PULSE_MAX         2000              /* to match your own servo */
+#define PULSE_RANGE       (PULSE_MAX - PULSE_MIN)
+#define PULSE_OVER        3000        /* Must be larger than PULSE_MAX */
+
+#define START_TIME        10                                  /* 10 am */
+#define STOP_TIME     22                                      /* 10 pm */
+#define HOURS_RANGE        (STOP_TIME - START_TIME - 1)
+
+#define LASER             PB2
+#define LASER_PORT        PORTB
+#define LASER_DDR         DDRB
+
+#define SERVO             PB1
+#define SERVO_PORT        PORTB
+#define SERVO_DDR         DDRB
+
+#define OVERFLOWS_PER_SECOND   31250      /* nominal, should calibrate */
+
+
+// Serial input and output functions
+void pollSerial(void);
+void printTime(uint8_t hours, uint8_t minutes, uint8_t seconds);
+
+// Servo setup and utility functions
+void initTimer1_Servo(void);
+void enableServo(void);
+void disableServo(void);
+void setServoPosition(void);
+
+// Realtime-clock handling functions
+// Use the globals ticks, hours, minutes, seconds
+void initTimer0_Clock(void);
+void everyHour(void);
+void everyMinute(void);
+void everySecond(void);