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

Make AVR Examples/Chapter19_EEPROM/vigenereCipher/vigenereCipher.h

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+
+#include <avr/io.h>
+#include <avr/eeprom.h>
+#include "USART.h"
+
+#define MAX_TEXT_LENGTH  256
+#define CODE_LEN         64
+
+// -------- Global Variables --------- //
+char EEMEM code0[CODE_LEN] = "ettubrute";
+char EEMEM code1[CODE_LEN] = "attackatdawn";
+char EEMEM code2[CODE_LEN] = "theraininspainfallsmainlyontheplain";
+char EEMEM code3[CODE_LEN] = "ablewasiereisawelba";
+char *codePointers[] = { code0, code1, code2, code3 };
+
+// Menu strings.  Why not store them in EEPROM?
+char EEMEM welcomeString[] = "\r\n--==  Vigenere Cipher  ==--\r\n";
+char EEMEM menuEncode[] = " [e] to encode text\r\n";
+char EEMEM menuDecode[] = " [d] to decode text\r\n\r\n";
+char EEMEM menuEnterText[] = " [n] to enter new text\r\n";
+char EEMEM menuCodeText[] = " [c] to select your code phrase\r\n";
+char EEMEM menuChangeCode[] = " [x] to modify code phrases\r\n";
+char EEMEM promptCode[] = "code: ";
+char EEMEM promptText[] = "\r\ntext: ";
+
+char EEMEM promptSelectCode[] = "Select codephrase:\r\n\r\n";
+char EEMEM promptTypeText[] = "Type your text: ";
+
+// Given the address of an EEPROM string, prints it out
+// Used for menu items
+void printFromEEPROM(char *eepromString);
+
+// Takes input from serial, stores it in the text array
+void enterText(char text[]);
+
+// Reads code phrases out of EEPROM and prints them.
+// Uses the codeBuffer for temporary storage
+void displayCodes(void);
+
+// Changes a code phrase, both in EEPROM and the current code
+void changeCode(char codeBuffer[]);
+
+// Pick a code phrase from EEPROM
+void selectCode(char code[]);
+
+// Encodes the passed text string, in place
+void encodeVigenere(char text[], char code[]);
+
+// Decodes the passed text string, in place
+void decodeVigenere(char text[], char code[]);