void setup ()
{
  Serial.begin (2000000UL);
  Serial.println ();
}

//#define BUFF_LEN (RAMEND-RAMSTART+1)-500
#define BUFF_LEN 1024

int16_t data [BUFF_LEN];


const char hex[] = "01234567890ABCDEF";

void loop () {

  uint8_t *p;

  p = (uint8_t *)data;

  for (int i = 0; i < sizeof(data); i++ )
  {
    *p++ = i;//rand();
  }

  unsigned long us = micros();

  p = (uint8_t*)data;
  for (uint16_t i = 0; i < sizeof(data); i++ )
  {

    //Serial.write(*p);

    Serial.write(hex[*p >> 4]);
    Serial.write(hex[*p & 0x0F]);

    p++;

  }

  Serial.println ();

  us = micros() - us;

  Serial.print (F("Duration: "));
  Serial.print (us);
  Serial.println (F(" us"));

  Serial.print (F("Buffer size: "));
  Serial.print (sizeof(data));
  Serial.println (F(" bytes"));

  Serial.print (F("RAMSTART: "));
  Serial.println (RAMSTART);

  Serial.print (F("RAMEND: "));
  Serial.println (RAMEND);

  Serial.print (F("Total: "));
  Serial.println (RAMEND - RAMSTART + 1);


  delay(1000);
}