#include "stdlib.h"
#include "avr/io.h"
#include "util/delay.h"

void serial();

static int rpos=0;

int main()
{
   DDRA &= ~(0b00000101); // for the USI input clk nd di
   DDRA |= 0b00000010;

   while(1)
   {
      serial();
   }

return 0;
}


void serial()
{
   USICR = 0b00011000;
   USIPP = 0x01;
   USIDR = 0b10101010;

//wait for 16 edges and counter overflow flag to be set
   while(!(USISR & (1<<USIOIF)));

   rpos=USIBR;
}