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

Make AVR Examples/Chapter18_Using-Flash-Program-Memory/progmemDemo5/progmemDemo5.c

@@ -0,0 +1,68 @@
+                              /* Fourth step into using program memory */
+                           /* Passing data array pointers to functions */
+
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/pgmspace.h>
+#include "USART.h"
+
+const uint16_t myData[] PROGMEM =
+    { 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 10000 };
+
+const char string1[] PROGMEM = "Hey, string one!\r\n";
+const char string2[] PROGMEM = "Oh my, string two!\r\n";
+const char *const stringIndex[] PROGMEM = { string1, string2 };
+
+
+void printData_Progmem(const uint16_t * dataPointer, uint8_t length) {
+  while (length) {
+    printWord((uint16_t) dataPointer);            /* print out address */
+    printString(":  ");
+    printWord(pgm_read_word(dataPointer));           /* print out data */
+    printString("\r\n");
+    dataPointer++;                                /* move to next byte */
+    length--;                                   /* one less byte to go */
+    _delay_ms(100);
+  }
+}
+void printString_Progmem(const char *stringP) {
+  char oneLetter;
+  while ((oneLetter = pgm_read_byte(stringP))) {
+    transmitByte(oneLetter);
+    stringP++;
+  }
+}
+
+int main(void) {
+  initUSART();
+
+  uint8_t myArray[] = { 10, 11, 12 };
+  uint8_t *p;
+  uint8_t i;
+  p = &myArray[0];
+  for (i = 0; i < sizeof(myArray); i++) {
+    printByte(*(p + i));
+    printString("\r\n");
+    _delay_ms(1000);
+  }
+
+
+                                                       /* To use them: */
+  char *stringPointer;
+                /* Get the pointer to the string you want from PROGMEM */
+
+  stringPointer = (char *) pgm_read_word(&stringIndex[0]);
+  printString_Progmem(stringPointer);
+                                                                 /* or */
+  stringPointer = (char *) pgm_read_word(&stringIndex[1]);
+  printString_Progmem(&stringPointer[0]);
+                                                                 /* or */
+  printString_Progmem(PSTR("And this string got inlined.\r\n"));
+
+  while (1) {
+    printData_Progmem(myData, sizeof(myData) / sizeof(myData[0]));
+    printString("\r\n");
+    _delay_ms(1000);
+  }                                                  /* End event loop */
+  return 0;                            /* This line is never reached */
+}