Shift RegisterEnum definition#pub enum BitOrder{/*files omitted*/}CopyHelper enum for bit order of the value. LSBFIRST : Least significant bit first.MSBFIRST : Most significant bit first.Function Definition#shift_in#pub fn shift_in(datapin: u8, clockpin: u8, bit_order: BitOrder) -> u8 CopyUsage:#use rustduino::avr::shift::*;let data:u8 = 2;let clock:u8 = 3;let bit_order = BitOrder::MSBFIRST; let value:u8 = shift_in(data, clock, bit_order);CopyReturns the value stored in the shift register.shift_out#pub fn shift_out(datapin: u8, clockpin: u8, bit_order: BitOrder, mut value:u8)CopyUsage:#use rustduino::avr::shift::*;let data:u8 = 2;let clock:u8 = 3;let bit_order = BitOrder::MSBFIRST;let mut value:u8 = 0b11001010; let value:u8 = shift_out(data, clock, bit_order, value);CopyShifts out the 8 bits to the shift register.