Ya que me pusiste tu codigo entero, lo he modificado y quedaria así, lo he probado y aparentemente funciona sin errores, espero que te sirva, un saludo.
#include <Tone.h>
#include <stdlib.h>
#include <avr/pgmspace.h>
Tone tone1;
#define OCTAVE_OFFSET 0
int notes[] = { 0,
NOTE_C4, NOTE_CS4, NOTE_D4, NOTE_DS4, NOTE_E4, NOTE_F4, NOTE_FS4, NOTE_G4, NOTE_GS4, NOTE_A4, NOTE_AS4, NOTE_B4,
NOTE_C5, NOTE_CS5, NOTE_D5, NOTE_DS5, NOTE_E5, NOTE_F5, NOTE_FS5, NOTE_G5, NOTE_GS5, NOTE_A5, NOTE_AS5, NOTE_B5,
NOTE_C6, NOTE_CS6, NOTE_D6, NOTE_DS6, NOTE_E6, NOTE_F6, NOTE_FS6, NOTE_G6, NOTE_GS6, NOTE_A6, NOTE_AS6, NOTE_B6,
NOTE_C7, NOTE_CS7, NOTE_D7, NOTE_DS7, NOTE_E7, NOTE_F7, NOTE_FS7, NOTE_G7, NOTE_GS7, NOTE_A7, NOTE_AS7, NOTE_B7
};
prog_char string_0[] PROGMEM = "The Simpsons:d=4,o=5,b=160:c.6,e6,f#6,8a6,g.6,e6,c6,8a,8f#,8f#,8f#,2g,8p,8p,8f#,8f#,8f#,8g,a#.,8c6,8c6,8c6,c6"; // "String 0" etc. son strings a guardar.
prog_char string_1[] PROGMEM = "Indiana:d=4,o=5,b=250:e,8p,8f,8g,8p,1c6,8p.,d,8p,8e,1f,p.,g,8p,8a,8b,8p,1f6,p,a,8p,8b,2c6,2d6,2e6,e,8p,8f,8g,8p,1c6,p,d6,8p,8e6,1f.6,g,8p,8g,e.6,8p,d6,8p,8g,e.6,8p,d6,8p,8g,f.6,8p,e6,8p,8d6,2c6";
prog_char string_2[] PROGMEM = "20thCenFox:d=16,o=5,b=140:b,8p,b,b,2b,p,c6,32p,b,32p,c6,32p,b,32p,c6,32p,b,8p,b,b,b,32p,b,32p,b,32p,b,32p,b,32p,b,32p,b,32p,g#,32p,a,32p,b,8p,b,b,2b,4p,8e,8g#,8b,1c#6,8f#,8a,8c#6,1e6,8a,8c#6,8e6,1e6,8b,8g#,8a,2b";
prog_char string_3[] PROGMEM = "Mario:d=16,o=6,b=100:32p,e,e,p,e,p,c,e,p,g,8p.,g5,8p.,c,8p,g5,8p,e5,8p,a5,p,b5,p,a#5,a5,p,g5,e,g,a,p,f,g,p,e,p,c,d,b5,4p,g,f#,f,d#,p,e,p,g#5,a5,c,p,a5,c,d,8p,8d#,p,d,8p,8c";
PROGMEM const char *string_table[] =
{
string_0,
string_1,
string_2,
string_3
};
char *p;
char song[700]; //del tamaño de la cadena mas grande
bool reproducir=false,nuevo=false;
byte default_dur = 4;
byte default_oct = 6;
int bpm = 63;
int num;
long wholenote;
long duration;
byte note;
byte scale;
#include <PS2Keyboard.h>
const int DataPin = 8;
const int IRQpin = 2;
String comando;
PS2Keyboard keyboard;
void setup(void)
{
Serial.begin(9600);
tone1.begin(6);
pinMode(13, OUTPUT);
keyboard.begin(DataPin, IRQpin);
}
#define isdigit(n) (n >= '0' && n <= '9')
void inicializar_tono()
{
while(*p != ':') p++; // ignore name
p++; // skip ':'
// get default duration
if(*p == 'd')
{
p++; p++; // skip "d="
num = 0;
while(isdigit(*p))
{
num = (num * 10) + (*p++ - '0');
}
if(num > 0) default_dur = num;
p++; // skip comma
}
Serial.print("ddur: "); Serial.println(default_dur, 10);
// get default octave
if(*p == 'o')
{
p++; p++; // skip "o="
num = *p++ - '0';
if(num >= 3 && num <=7) default_oct = num;
p++; // skip comma
}
Serial.print("doct: "); Serial.println(default_oct, 10);
// get BPM
if(*p == 'b')
{
p++; p++; // skip "b="
num = 0;
while(isdigit(*p))
{
num = (num * 10) + (*p++ - '0');
}
bpm = num;
p++; // skip colon
}
Serial.print("bpm: "); Serial.println(bpm, 10);
// BPM usually expresses the number of quarter notes per minute
wholenote = (60 * 1000L / bpm) * 4; // this is the time for whole note (in milliseconds)
Serial.print("wn: "); Serial.println(wholenote, 10);
}
void sonar(){
num = 0;
while(isdigit(*p))
{
num = (num * 10) + (*p++ - '0');
}
if(num) duration = wholenote / num;
else duration = wholenote / default_dur; // we will need to check if we are a dotted note after
// now get the note
note = 0;
switch(*p)
{
case 'c':
note = 1;
break;
case 'd':
note = 3;
break;
case 'e':
note = 5;
break;
case 'f':
note = 6;
break;
case 'g':
note = 8;
break;
case 'a':
note = 10;
break;
case 'b':
note = 12;
break;
case 'p':
default:
note = 0;
}
p++;
// now, get optional '#' sharp
if(*p == '#')
{
note++;
p++;
}
// now, get optional '.' dotted note
if(*p == '.')
{
duration += duration/2;
p++;
}
// now, get scale
if(isdigit(*p))
{
scale = *p - '0';
p++;
}
else
{
scale = default_oct;
}
scale += OCTAVE_OFFSET;
if(*p == ',')
p++; // skip comma for next note (or we may be at the end)
// now play the note
if(note)
{
Serial.print("Playing: ");
Serial.print(scale, 10); Serial.print(' ');
Serial.print(note, 10); Serial.print(" (");
Serial.print(notes[(scale - 4) * 12 + note], 10);
Serial.print(") ");
Serial.println(duration, 10);
tone1.play(notes[(scale - 4) * 12 + note]);
delay(duration);
tone1.stop();
}
else
{
Serial.print("Pausing: ");
Serial.println(duration, 10);
delay(duration);
}
}
void play_rtttl()
{
// Absolutely no error checking in here
// format: d=N,o=N,b=NNN:
// find the start (skip name, etc)
if (nuevo){
inicializar_tono();
nuevo=false;
}
// now begin note loop
if(*p)
{
// first, get note duration, if available
sonar();
}else{reproducir=false;}
}
void loop(void)
{
//
digitalWrite(13, HIGH);
if (reproducir){play_rtttl();}
if (keyboard.available()) {
// read the next key
char c = keyboard.read();
// check for some of the special keys
if (c == PS2_ENTER) {
Serial.println(comando);
char this_char[comando.length() + 1];
comando.toCharArray(this_char, sizeof(this_char));
switch (atoi(this_char)) {
case 1:{
strcpy_P(song, (char*)pgm_read_word(&(string_table[0])));
p=song;
break;}
case 2:{
strcpy_P(song, (char*)pgm_read_word(&(string_table[1])));
p= song;
break;}
case 3:{
strcpy_P(song, (char*)pgm_read_word(&(string_table[2])));
p=song;
break;}
case 4:{
strcpy_P(song, (char*)pgm_read_word(&(string_table[3])));
p=song;
break;}
}
//p=song[atoi(this_char)];
nuevo=true;
reproducir=true;
comando="";
} else if (c == PS2_TAB) {
Serial.print("[Tab]");
} else if (c == PS2_ESC) {
Serial.print("[ESC]");
} else if (c == PS2_PAGEDOWN) {
Serial.print("[PgDn]");
} else if (c == PS2_PAGEUP) {
Serial.print("[PgUp]");
} else if (c == PS2_LEFTARROW) {
Serial.print("[Left]");
} else if (c == PS2_RIGHTARROW) {
Serial.print("[Right]");
} else if (c == PS2_UPARROW) {
Serial.print("[Up]");
} else if (c == PS2_DOWNARROW) {
Serial.print("[Down]");
} else if (c == PS2_DELETE) {
Serial.print("[Del]");
} else {
// otherwise, just print all normal characters
Serial.print(c);
comando.concat(c);
}
}
digitalWrite(13, LOW);
//delay(500);
}
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