/*

  PROGMEM string demo

  How to store a table of strings in program memory (flash),

  and retrieve them.

​

  Information summarized from:

  http://www.nongnu.org/avr-libc/user-manual/pgmspace.html

​

  Setting up a table (array) of strings in program memory is slightly complicated, but

  here is a good template to follow.

​

  Setting up the strings is a two-step process. First, define the strings.

*/

​

#include <avr/pgmspace.h>

const char string_0[] PROGMEM = "String 0"; // "String 0" etc are strings to store - change to suit.

const char string_1[] PROGMEM = "String 1";

const char string_2[] PROGMEM = "String 2";

const char string_3[] PROGMEM = "String 3";

const char string_4[] PROGMEM = "String 4";

const char string_5[] PROGMEM = "String 5";

​

​

// Then set up a table to refer to your strings.

​

const char *const string_table[] PROGMEM = {string_0, string_1, string_2, string_3, string_4, string_5};

​

char buffer[30];  // make sure this is large enough for the largest string it must hold

​

void setup() {

  Serial.begin(9600);

  while (!Serial);  // wait for serial port to connect. Needed for native USB

  Serial.println("OK");

}

​

​

void loop() {

  /* Using the string table in program memory requires the use of special functions to retrieve the data.

     The strcpy_P function copies a string from program space to a string in RAM ("buffer").

     Make sure your receiving string in RAM is large enough to hold whatever

     you are retrieving from program space. */

​

​

  for (int i = 0; i < 6; i++) {

    strcpy_P(buffer, (char *)pgm_read_word(&(string_table[i])));  // Necessary casts and dereferencing, just copy.

    Serial.println(buffer);

    delay(500);

  }

}

const char sm00[] PROGMEM = "Write it on your heart that every day is the best day in the year.";

const char sm01[] PROGMEM = "Perfection is not attainable, but if we chase perfection we can catch excellence.";

const char sm02[] PROGMEM = "Everything you've ever wanted is on the other side of fear.";

const char sm03[] PROGMEM = "Nothing is impossible, the word itself says 'I'm possible.'";

const char sm04[] PROGMEM = "Failure is the condiment that gives success its flavor.";

const char sm05[] PROGMEM = "It is never too late to be what you might have been.";

const char sm06[] PROGMEM = "The roots of education are bitter, but the fruit is sweet.";

const char sm07[] PROGMEM = "To be the best, you must be able to handle the worst.";

const char sm08[] PROGMEM = "The key to immortality is first living a life worth remembering.";

const char sm09[] PROGMEM = "You must be the change you wish to see in the world.";

const char sm10[] PROGMEM = "Mastering others is strength. Mastering yourself is true power.";

const char sm11[] PROGMEM = "Knowing is not enough, We must apply.";

const char sm12[] PROGMEM = "We will either find a way or make one.";

const char sm13[] PROGMEM = "Man doesn't know what he is capable of until he is asked.";

const char sm14[] PROGMEM = "Be sure what you want and be sure about yourself.";

const char sm15[] PROGMEM = "With our thoughts, we make the world.";

const char sm16[] PROGMEM = "Change your life today.";

const char sm17[] PROGMEM = "Opportunities don't happen, you create them.";

​

const char * const msgs[] PROGMEM = { sm00, sm01, sm02, sm03, sm04, sm05, sm06, sm07, sm08,

                                      sm09, sm10, sm11, sm12, sm13, sm14, sm15, sm16, sm17

                                    };

void setup() {

  Serial.begin(250000);

  for (byte quote = 0; quote < sizeof(msgs) / sizeof(msgs[0]); quote++) {

    Serial.print(F("quote "));

    if (quote < 10) {

      Serial.write('0');

    }

    Serial.print(quote);

    Serial.print(F(" \""));

    Serial.print((__FlashStringHelper*)pgm_read_word(&msgs[quote]));

    Serial.println(F("\""));

  }

}

void loop() {}