datainflash.ino

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// HOW TO SAVE DATA IN FLASH
#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";
 
const unsigned char mydata[11][10] PROGMEM =
{
        {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09},
        {0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,0x13},
        {0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D},
        {0x1E,0x1F,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27},
        {0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,0x31},
        {0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B},
        {0x3C,0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,0x45},
        {0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F},
        {0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59},
        {0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,0x60,0x61,0x62,0x63},
        {0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D}
};
 
 
// Then set up a table to refer to your strings.
 
 const char * PROGMEM string_table[] =     // change "string_table" name to suit
{   
  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);
}
 
 
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 );
  }
}