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

Make AVR Examples/Chapter03_Digital-Output/povToy_invaders/invaders.c

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+/*
+  Space Invaders POV demo by Elliot Williams
+  This version stores the displays in arrays,
+  loops over their elements in a function.
+*/
+
+#include <avr/io.h>
+#include <util/delay.h>
+#define DELAYTIME 2                                              /* ms */
+
+#define LED_PORT                PORTB
+#define LED_DDR                 DDRB
+
+uint8_t invaderData1[] = {
+  0b01110000,
+  0b00011000,
+  0b11111101,
+  0b10110110,
+  0b00111100,
+  0b00111100,
+  0b00111100,
+  0b10110110,
+  0b11111101,
+  0b00011000,
+  0b01110000
+};
+
+uint8_t invaderData2[] = {
+  0b00001110,
+  0b00011000,
+  0b10111101,
+  0b01110110,
+  0b00111100,
+  0b00111100,
+  0b00111100,
+  0b01110110,
+  0b10111101,
+  0b00011000,
+  0b00001110
+};
+
+
+void pause(void){
+	uint8_t i;
+	for (i=0; i<5; i++){
+		_delay_ms(DELAYTIME);
+	}
+}
+
+void POVDisplay(uint8_t povData[], uint8_t numberRows) {
+  uint8_t i;
+  for (i = 0; i < numberRows; ++i) {
+    LED_PORT = povData[i];
+    _delay_ms(DELAYTIME);
+  }
+  pause();
+}
+
+int main(void) {
+
+  LED_DDR = 0xff;                            /* set all LEDs to output */ 
+
+  while (1) {                                              /* mainloop */
+
+      POVDisplay(invaderData1, sizeof(invaderData1));
+      POVDisplay(invaderData2, sizeof(invaderData2));
+
+  }                                                    /* end mainloop */
+  return 0;
+}