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

Make AVR Examples/Chapter05_Serial-IO/serialLoopback/serialLoopback.c

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+/*
+A simple test of serial-port functionality.
+Takes in a character at a time and sends it right back out,
+ displaying the ASCII value on the LEDs.
+*/
+
+// ------- Preamble -------- //
+#include <avr/io.h>
+#include <util/delay.h>
+#include "pinDefines.h"
+#include "USART.h"
+
+int main(void) {
+  char serialCharacter;
+
+  // -------- Inits --------- //
+  LED_DDR = 0xff;                            /* set up LEDs for output */
+  initUSART();
+  printString("Hello World!\r\n");                          /* to test */
+
+  // ------ Event loop ------ //
+  while (1) {
+
+    serialCharacter = receiveByte();
+    transmitByte(serialCharacter);
+    LED_PORT = serialCharacter;
+                           /* display ascii/numeric value of character */
+
+  }                                                  /* End event loop */
+  return 0;
+}