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

Make AVR Examples/Chapter04_Bit-Twiddling/cylonEyes_quasiRandomToggle/quasiRandomToggle.c

@@ -0,0 +1,30 @@
+                                                         /* Cylon Eyes */
+
+// ------- Preamble -------- //
+#include <avr/io.h>                        /* Defines pins, ports, etc */
+#include <util/delay.h>                     /* Functions to waste time */
+
+#define DELAYTIME 45                                   /* milliseconds */
+#define LED_PORT                PORTB
+#define LED_PIN                 PINB
+#define LED_DDR                 DDRB
+
+int main(void) {
+
+  // -------- Inits --------- //
+  uint16_t x = 0x1234;
+  uint8_t y;
+  LED_DDR = 0xff;               /* Data Direction Register B:
+                                   all set up for output */
+
+  // ------ Event loop ------ //
+  while (1) {
+
+    x = 2053 * x + 13849;                 /* "random" number generator */
+    y = (x >> 8) & 0b00000111;       /* pick three bits from high byte */
+    LED_PORT ^= (1 << y);                            /* toggle one bit */
+    _delay_ms(100);
+
+  }                                                  /* End event loop */
+  return 0;
+}