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

Make AVR Examples/AVR-Programming-Library/USART.h

@@ -0,0 +1,45 @@
+/* Functions to initialize, send, receive over USART
+
+   initUSART requires BAUD to be defined in order to calculate
+     the bit-rate multiplier.
+ */
+
+#ifndef BAUD                          /* if not defined in Makefile... */
+#define BAUD  9600                     /* set a safe default baud rate */
+#endif
+
+                                  /* These are defined for convenience */
+#define   USART_HAS_DATA   bit_is_set(UCSR0A, RXC0)
+#define   USART_READY      bit_is_set(UCSR0A, UDRE0)
+
+/* Takes the defined BAUD and F_CPU,
+   calculates the bit-clock multiplier,
+   and configures the hardware USART                   */
+void initUSART(void);
+
+/* Blocking transmit and receive functions.
+   When you call receiveByte() your program will hang until
+   data comes through.  We'll improve on this later. */
+void transmitByte(uint8_t data);
+uint8_t receiveByte(void);
+
+void printString(const char myString[]);
+             /* Utility function to transmit an entire string from RAM */
+void readString(char myString[], uint8_t maxLength);
+/* Define a string variable, pass it to this function
+   The string will contain whatever you typed over serial */
+
+void printByte(uint8_t byte);
+                  /* Prints a byte out as its 3-digit ascii equivalent */
+void printWord(uint16_t word);
+        /* Prints a word (16-bits) out as its 5-digit ascii equivalent */
+
+void printBinaryByte(uint8_t byte);
+                                     /* Prints a byte out in 1s and 0s */
+char nibbleToHex(uint8_t nibble);
+char nibbleToHexCharacter(uint8_t nibble);
+void printHexByte(uint8_t byte);
+                                   /* Prints a byte out in hexadecimal */
+uint8_t getNumber(void);
+/* takes in up to three ascii digits,
+ converts them to a byte when press enter */