Arduino Poor man's oscilloscope with verification generator

gistfile1.c

// The Arduino code.                                                            
                                                                                
#define ANALOG_IN 0                                                             
int outPin=13;                                                                  
int outPinState = LOW;                                                          
int count = 1;                                                                  
int every = 10000;                                                              
                                                                                
void setup() {                                                                  
  //Serial.begin(9600);                                                         
  Serial.begin(115200);                                                         
}                                                                               
                                                                                
void loop() {                                                                   
  int val = analogRead(ANALOG_IN);                                              
  Serial.write( 0xff );                                                         
  Serial.write( (val >> 8) & 0xff );                                            
  Serial.write( val & 0xff );                                                   
                                                                                
  /* Generate signal to test oscilloscope */                                    
  if ((count % every) == 0) {                                                   
    if (outPinState == LOW) {                                                   
      outPinState = HIGH;                                                       
    } else {                                                                    
      outPinState = LOW;                                                        
    }                                                                           
    digitalWrite(outPin, outPinState);                                          
    count = 0;                                                                  
  }                                                                             
  count++;                                                                      
}