//global flags
int power = 1;   //0 is off, 1 is on, set to 1 initially to get control of cd player
int play_pause = 0;   //0 is pause, 1 is play, set intially to pause so that we can play the first track
int t = 4.1;   //initalize to length of tracks, MUST ADJUST THIS VALUE

void initialize_cd_player()
{
    int i;
    
    for (i=0; i<=4; i++)
      {
        set_digital_out(i);
    }
    
    //get control of cd player
    sleep (1.0);
    power_off();
    
    //turn cd play on
    sleep(3.0);   //wait for shutdown to complete
    power_on();
    
    printf ("Initialization done\n");
}

void init_CD()
{
    //set digital outputs 0-4 = 1
    initialize_cd_player();
    
    //DO STUFF HERE -- remember to put some sleeps in to accomodate for physical speed
}

/* Here's what the 5 pins do
0: white = power
1: grey = stop
2: purple = fast forwards
3: blue = play/pause
4: green = backwards

In order to do an operation we must first clear then set */

void power_on()
{
    if (power == 0)
      {
        //like pressing on button
        clear_digital_out(0);
        sleep(0.5);
        set_digital_out(0);
        
        power = 1;
    }
}

void power_off()
{
    if (power == 1)
      {
        clear_digital_out(0);
        sleep(0.5);
        set_digital_out(0);
        
        power = 0;
    }
}

void cd_stop()
{
    clear_digital_out(1);
    sleep(0.5);
    set_digital_out(1);
}

void play()
{
    if (play_pause == 0)   //we know it was paused or the code is just starting up
      {
        clear_digital_out(3);
        sleep(0.5);
        set_digital_out(3);
        
        play_pause = 1;    //set flag to play
    }
}

void pause()
{
    if (play_pause == 1)
      {
        clear_digital_out(3);
        sleep(0.5);
        set_digital_out(3);
        
        play_pause = 0;   //set flag to pause
    }
}

//sleep fastforwards to length of time; will use this to get to appropriate tracks
void fast_forward(int track_number)
{
    int i;
    
    for (i=0; i<= track_number; i++)
      {
        clear_digital_out(2);
        sleep(t);
        set_digital_out(2);
    }
}

//sleep backwards to length of time; could use this to get to appropriate tracks
//-- will probably only use fastforwards
void backwards(int track_number)
{
    int i;
    
    for (i=0; i<= track_number; i++)
      {
        clear_digital_out(4);
        sleep(t);
        set_digital_out(4);
    }
}