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

Make AVR Examples/Chapter03_Digital-Output/povToy_cylonEyes/cylonEyes_POV.c

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+/*
+
+Cylon eyes actually turns out to be a decent POV routine.
+The only change here is in DELAYTIME.
+
+ */
+
+
+#include <avr/io.h>                        /* Defines pins, ports, etc */
+#include <util/delay.h>                     /* Functions to waste time */
+
+#define DELAYTIME 2                                    /* milliseconds */
+
+int main(void) {
+  uint8_t i=0;
+  DDRB = 0b11111111;              /* Data Direction Register B: all on */
+
+  while (1) {
+
+    while (i < 7) {
+      PORTB = (1 << i);                    /* illuminate only i'th pin */
+      _delay_ms(DELAYTIME);                                    /* wait */
+      i = i + 1;                               /* move to the next LED */
+    }
+
+    while (i > 0) {
+      PORTB = (1 << i);                    /* illuminate only i'th pin */
+      _delay_ms(DELAYTIME);                                    /* wait */
+      i = i - 1;                           /* move to the previous LED */
+    }
+  }
+
+  return 0;
+}