Sampling Arduino Pins Quickly

sketch_mar17a.pde

/*
Sampling with the Arduino
  based on examples from 
  http://sites.goggle.com/site/MeasuringStuff
*/
#define FASTADC 1
// defines for setting and clearing register bits
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif

// the famous LED on digital pin 13
byte ledPin =  13; 
// our array size
int i=0; 
int size=64; 
unsigned long time[64]; 
unsigned long time2[32]; 
unsigned int rawdata[32]; 
unsigned int rawdata2[64]; 

void setup() {
  // initialize both serial ports:
  Serial.begin(9600);
  // signal ready to start by turning on LED 13
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);
  #if FASTADC
    // set prescale to 16
    cbi(ADCSRA,ADPS2) ;
    sbi(ADCSRA,ADPS1) ;
    sbi(ADCSRA,ADPS0) ;
  #endif
}

void loop() {
  for (i=0 ;i<size;i++){
  time[i]=micros();
//  rawdata[i]=analogRead(0);
//  time2[i]=micros();  
  rawdata2[i]=analogRead(2); 
  Serial.print(micros());
  Serial.print(" , "); 
  Serial.print(analogRead(2)); 
  Serial.println(""); 
  }
//  for (i=0;i<size;i++) {
//    Serial.print(time[i]);
//    Serial.print(" , ");
//    Serial.print(rawdata[i]);
//    Serial.print(" , ");
//    Serial.print(time2[i]);
//    Serial.print(" , ");
//    Serial.println(rawdata2[i]);
//  }
  
  Serial.println("");
  delay(5000);
}