<code c>
volatile uint8_t* const REG_GPIO = (uint8_t*)0x20000018;

#define P0  (REG_GPIO[0])
#define P1  (REG_GPIO[1])
#define P2  (REG_GPIO[2])
#define P3  (REG_GPIO[3])

int kkk[1*1024]={999, 1000, 10001, 1898, 8888};

void setup() {
  // put your setup code here, to run once:
   Serial.print(" ===================="); 
   P3 = 0xAA;
   delay (1000);
 
}

int t = 0;

uint32_t i = 0;
uint8_t led_position = 0;

void loop() {
 
 Serial.print (i);
 i = (i + 1) %(1024);
 Serial.print(" ===================="); 
 kkk [i] = kkk [i] + i;
 Serial.print (kkk[i]);
 Serial.println (" ");
 delay (600);
 led_position = (led_position + 1) % 8;

 P3 = ~(1 << led_position);
}
</code>