/*
 * DON'T use the MOSI/MISO pins. They're for ISP programming only!
 * Read the datasheet.
 */
DDRB |= _BV(PB4); // as output (latch)
DDRB |= _BV(PB6); // as output (DO) - data out
DDRB |= _BV(PB7); // as output (USISCK) - clock
DDRB &= ~_BV(PB5); // as input (DI) - data in
PORTB |= _BV(PB5); // pullup on (DI)