#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/spi.h"
#include "hardware/gpio.h"
#include "hardware/timer.h"

int main() {
  stdio_init_all();//I still have no clue what this function does
  spi_init(spi0, 9600);//initiallizing SPI since I do not want to bit-bang
  gpio_init(4);//latch pin
  gpio_set_function(2,1);
  gpio_set_function(3,1);
  gpio_set_dir(4,1);//dir out
  int n1 = 0b11111111; //default all out
  int n2 = 0b10101010;
  int n3 = 0b01010101;
  int n = 1;
  while (1){
    gpio_put(4,0);
    if (n%2 == 0) { //testing the parity of n
      spi_write_blocking(spi0, &n2, 1); //lights on
    } else {
      spi_write_blocking(spi0, &n3, 1); //lights on
    }
    gpio_put(4,1);
    n += 1;
    sleep_ms(1000);    
  }
  return 0;
}