//Program: Pico_LLP_02a.ino ///////////////
int myShift;
//pointers for GPIO Registers
//uint32_t *gpioOUT     = (uint32_t *)(0xD0000010);
uint32_t *gpioOUT_SET = (uint32_t *)(0xD0000014);
uint32_t *gpioOUT_CLR = (uint32_t *)(0xD0000018);
//uint32_t *gpioOUT_XOR = (uint32_t *)(0xD000001C);

void setup() {
  Serial1.begin(1152000);
  Serial1.println("Start Pi Pico....");
  for(int i = 0; i < 4; i++){
      pinMode(i, OUTPUT);
  }
}

void loop() {
  myShift =0b0001; //initial myShift
  for(int a =0;a < 4; a++){
    *gpioOUT_SET = myShift; //set BIT
    delay(1000);
    *gpioOUT_CLR = myShift; //clear BIT
    myShift = myShift << 1;
  }
} //END program //