#include"header.h"

void setup() {
  // put your setup code here, to run once:
  port_init();
}

void loop() {
  // put your main code here, to run repeatedly:
  char x;
  x = 0b10000001;   // we can "change" x value
  output(x);
}

// x= 1,0x01,129,0b10000001 ...