File content as of revision 0:ace18d31cd7e:

#include "mbed.h"

//DigitalOut myled(LED1);

//int main() {
//    while(1) {
//        myled = 1;
//        wait(0.2);
//        myled = 0;
//        wait(0.2);
//    }
//}

void setup();
void loop();
void flash_eyes();
int read_accel();
void beep(DigitalOut speakerPin, int frequency, long duration);
void play(DigitalOut speakerPin, const char *note, long duration);
void play_tune();

//DigitalOut ledPin = 13;        // LED is connected to digital pin 13
DigitalOut speakerPin(p8);     // speaker connected to p8
DigitalOut catseye1(LED1);      // cat's eye no1
DigitalOut catseye2(LED2);      // cat's eye no2
//DigitalOut moveSensor = 3;     // analogue input for accelerometer
//DigitalOut buttonPin = 11;     // button input

// A note in one octave is twice the frequency of the same note in the octave
// below.  We define here the frequencies of the notes in octave 8.  To get
// notes in lower octaves, we just divide by two however many times.

#define NOTE_C8         4186
#define NOTE_CSHARP8    4434
#define NOTE_D8         4698
#define NOTE_DSHARP8    4978
#define NOTE_E8         5274
#define NOTE_F8         5587
#define NOTE_FSHARP8    5919
#define NOTE_G8         6271
#define NOTE_GSHARP8    6644
#define NOTE_A8         7040
#define NOTE_ASHARP8    7458
#define NOTE_B8         7902

// This is an array of note frequencies.  Index the array essentially by note
// letter multiplied by two (A = 0, B = 2, C = 4, etc.).  Add one to index for
// "sharp" note.  Where no sharp note exists, the natural note is just
// duplicated to make this indexing work.  The play() function below does all
// of this for you :)

int octave_notes[14] = {
	NOTE_A8, NOTE_ASHARP8,
	NOTE_B8, NOTE_B8,
	NOTE_C8, NOTE_CSHARP8,
	NOTE_D8, NOTE_DSHARP8,
	NOTE_E8, NOTE_E8,
	NOTE_F8, NOTE_FSHARP8,
	NOTE_G8, NOTE_GSHARP8,
};

// This variable tracks the current state of the eye LEDs.
int eyes = 0;

// Arduino runs this bit of code first, then repeatedly calls loop() below.  So
// all initialisation of variables and setting of initial pin modes (input or
// output) can be done here.

void setup() {
	//pinMode(ledPin, OUTPUT);        // sets the ledPin to be an output
	//pinMode(speakerPin, OUTPUT);    // sets the speakerPin to be an output
	//eyes = LOW;                     // initial state of cats eyes is LOW
	//pinMode(catseye1, OUTPUT);      // sets the cats eye1 to be an output
	//pinMode(catseye2, OUTPUT);      // sets the cats eye2 to be an output
	//pinMode(buttonPin, INPUT);      // sets the cats eye2 to be an output
//        Serial.begin(9600);
}

// Arduino will run this over and over again once setup() is done.

void loop()
{
    //read_accel();
	play_tune();    // call the play_tune() function
	wait(1.0);    // delay for 1 second
}

// -------------------------------------------------------------------------

// A function to toggle the cat's eyes on and off.
void flash_eyes()
{
	// Invert the desired state of the cat's eyes:
    eyes = !eyes;
//	if (eyes == LOW) {
//		eyes = HIGH;
//	} else {
//		eyes = LOW;
//	}

    catseye1 = eyes;
    catseye2 = eyes;
	// Write the new value to all the LED pins:
	//digitalWrite(ledPin, eyes);
	//digitalWrite(catseye1, eyes);
	//digitalWrite(catseye2, eyes);
}

// -------------------------------------------------------------------------

// Read accelerometer
int read_accel()
{
//  static int last_accel = 0;
//  int in = analogRead(moveSensor);
//  int diff = last_accel - in;
//  last_accel = in;
//  if (diff < -5 || diff > 5) {
//    return diff;
//  }
  return 0;
}

// To produce a tone, this function toggles the speaker output pin at the
// desired frequency (in Hz).  It calculates how many times to do this to
// produce a note of the desired length (in milliseconds).

void beep(DigitalOut speakerPin, int frequency, long duration)
{

	int i;
	long delayAmount = (long)(1000000/frequency);
	long loopTime = (long)((duration*1000)/(delayAmount*2));

        //int accel_diff = 0;
//        int button_in = digitalRead(buttonPin);
	for (i = 0; i < loopTime; i++) {
  		speakerPin = 1;
		wait_us(delayAmount);
        speakerPin = 0;
		wait_us(delayAmount);
	}
}

void play(DigitalOut speakerPin, const char *note, long duration)
{
        int octave_number = 4;  // default to octave 4
	int i = 0;

	// Check for valid note letter
	if (note[i] >= 'A' && note[i] <= 'G') {
		// Calculate index into octave_notes[]
		int note_index = (note[i] - 'A') * 2;
		i++;
		// Check for sharp sign
		if (note[i] == '#') {
			note_index++;
			i++;
		}
		// Check for an octave number
		if (note[i] >= '0' && note[i] <= '8') {
			octave_number = note[i] - '0';
			i++;
		}
		// Fetch the note frequency from the octave_notes[] table
		int frequency = octave_notes[note_index];

		// That will be the frequency for the note in octave 8, so we
		// need to divide it by two for each octave lower that we
		// actually want.

		// The '>>' operator is a useful shorthand that (for integers
		// >= 0) basically translates to "divide by two this many
		// times", so we will use that:

		frequency = frequency >> (8 - octave_number);

		// Actually play the note!
		beep(speakerPin, frequency, duration);
	}
}

void play_tune()
{
	flash_eyes(); play(speakerPin, "C6", 500);	// twin-
	flash_eyes(); play(speakerPin, "C6", 500);	// -kle
	flash_eyes(); play(speakerPin, "G6", 500);	// twin-
	flash_eyes(); play(speakerPin, "G6", 500);	// -kle
	flash_eyes(); play(speakerPin, "A6", 500);	// lit-
	flash_eyes(); play(speakerPin, "A6", 500);	// -tle
	flash_eyes(); play(speakerPin, "G6", 1000);	// star
	flash_eyes(); play(speakerPin, "F6", 500);	// how
	flash_eyes(); play(speakerPin, "F6", 500);	// i
	flash_eyes(); play(speakerPin, "E6", 500);	// won-
	flash_eyes(); play(speakerPin, "E6", 500);	// -der
	flash_eyes(); play(speakerPin, "D6", 500);	// what
	flash_eyes(); play(speakerPin, "D6", 500);	// you
	flash_eyes(); play(speakerPin, "C6", 1000);	// are

	flash_eyes(); play(speakerPin, "G6", 500);	// up
	flash_eyes(); play(speakerPin, "G6", 500);	// a-
	flash_eyes(); play(speakerPin, "F6", 500);	// -bove
	flash_eyes(); play(speakerPin, "F6", 500);	// the
	flash_eyes(); play(speakerPin, "E6", 500);	// world
	flash_eyes(); play(speakerPin, "E6", 500);	// so
	flash_eyes(); play(speakerPin, "D6", 1000);	// high
	flash_eyes(); play(speakerPin, "G6", 500);	// like
	flash_eyes(); play(speakerPin, "G6", 500);	// a
	flash_eyes(); play(speakerPin, "F6", 500);	// dia-
	flash_eyes(); play(speakerPin, "F6", 500);	// -mond
	flash_eyes(); play(speakerPin, "E6", 500);	// in
	flash_eyes(); play(speakerPin, "E6", 500);	// the
	flash_eyes(); play(speakerPin, "D6", 1000);	// sky

	flash_eyes(); play(speakerPin, "C6", 500);	// twin-
	flash_eyes(); play(speakerPin, "C6", 500);	// -kle
	flash_eyes(); play(speakerPin, "G6", 500);	// twin-
	flash_eyes(); play(speakerPin, "G6", 500);	// -kle
	flash_eyes(); play(speakerPin, "A6", 500);	// lit-
	flash_eyes(); play(speakerPin, "A6", 500);	// -tle
	flash_eyes(); play(speakerPin, "G6", 1000);	// star
	flash_eyes(); play(speakerPin, "F6", 500);	// how
	flash_eyes(); play(speakerPin, "F6", 500);	// i
	flash_eyes(); play(speakerPin, "E6", 500);	// won-
	flash_eyes(); play(speakerPin, "E6", 500);	// -der
	flash_eyes(); play(speakerPin, "D6", 500);	// what
	flash_eyes(); play(speakerPin, "D6", 500);	// you
	flash_eyes(); play(speakerPin, "C6", 1000);	// are

}

int main(void)
{
	//init();

	setup();
    
	while (1) {
		loop();
	}
        
	return 0;
}