Romeo sample code problem

greetings,

i new , purchased dfrduino romeo v1.1.
i have 2 motors hook m1 , m2.
with default code come romeo
the romeo able turn 2 motors when turned on romeo.

then, come across link
http://www.dfrobot.com/wiki/index.php/dfrduino_romeo-all_in_one_controller_v1.1%28sku:dfr0004%29
and decide give sample codes below try.  after compiled , uploaded romeo.
the motor stop working , green light stop blinking well.

no quite sure go there , how start sample codes test out m1 , m2.

would guys provide guidance on how start here.
where can download orginal codes?
what need modify in sample codes these 2 motor working again?

thank much,
t

******************************************************************
//standard pwm dc control
int e1 = 5;     //m1 speed control
int e2 = 6;     //m2 speed control
int m1 = 4;    //m1 direction control
int m2 = 7;    //m1 direction control

///for previous romeo, please use these pins.
//int e1 = 6;     //m1 speed control
//int e2 = 9;     //m2 speed control
//int m1 = 7;    //m1 direction control
//int m2 = 8;    //m1 direction control


void stop(void)                    //stop
{
  digitalwrite(e1,low); 
  digitalwrite(e2,low);     
} 
void advance(char a,char b)          //move forward
{
  analogwrite (e1,a);      //pwm speed control
  digitalwrite(m1,high);   
  analogwrite (e2,b);   
  digitalwrite(m2,high);
}
void back_off (char a,char b)          //move backward
{
  analogwrite (e1,a);
  digitalwrite(m1,low); 
  analogwrite (e2,b);   
  digitalwrite(m2,low);
}
void turn_l (char a,char b)             //turn left
{
  analogwrite (e1,a);
  digitalwrite(m1,low);   
  analogwrite (e2,b);   
  digitalwrite(m2,high);
}
void turn_r (char a,char b)             //turn right
{
  analogwrite (e1,a);
  digitalwrite(m1,high);   
  analogwrite (e2,b);   
  digitalwrite(m2,low);
}
void setup(void)
{
  int i;
  for(i=4;i<=7;i++)
    pinmode(i, output);
  serial.begin(19200);      //set baud rate
  serial.println("run keyboard control");
}
void loop(void)
{
  if(serial.available()){
    char val = serial.read();
    if(val != -1)
    {
      switch(val)
      {
      case 'w'://move forward
        advance (255,255);   //move forward in max speed
        break;
      case 's'://move backward
        back_off (255,255);   //move in max speed
        break;
      case 'a'://turn left
        turn_l (100,100);
        break;     
      case 'd'://turn right
        turn_r (100,100);
        break;
      case 'z':
        serial.println("hello");
        break;
      case 'x':
        stop();
        break;
      }
    }
    else stop();
  }
}
*****************************************************************

thank everyone.  studied sample codes , understand now. 

thanks again.
t

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