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

Make AVR Examples/Chapter04_Bit-Twiddling/cylonEyes/cylonEyes.c

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+                                                         /* Cylon Eyes */
+
+// ------- Preamble -------- //
+#include <avr/io.h>                        /* Defines pins, ports, etc */
+#include <util/delay.h>                     /* Functions to waste time */
+
+#define DELAYTIME 85                                   /* milliseconds */
+#define LED_PORT                PORTB
+#define LED_PIN                 PINB
+#define LED_DDR                 DDRB
+
+int main(void) {
+
+  // -------- Inits --------- //
+  uint8_t i=0;
+  LED_DDR = 0xff;               /* Data Direction Register B:
+                                   all set up for output */
+
+  // ------ Event loop ------ //
+  while (1) {
+
+    while (i < 7) {
+      LED_PORT = (1 << i);                 /* illuminate only i'th pin */
+      _delay_ms(DELAYTIME);                                    /* wait */
+      i = i + 1;                               /* move to the next LED */
+    }
+
+    while (i > 0) {
+      LED_PORT = (1 << i);                 /* illuminate only i'th pin */
+      _delay_ms(DELAYTIME);                                    /* wait */
+      i = i - 1;                           /* move to the previous LED */
+    }
+
+  }                                                  /* End event loop */
+  return 0;
+}