[dependencies.mcp23017]
version = "<version>"

extern crate mcp23017;

match mcp23017::MCP23017::default(i2c) {
    Ok(mut u) => {
        u.init_hardware();
        u.pin_mode(1, mcp23017::PinMode::OUTPUT);   // for the first pin
        u.all_pin_mode(mcp23017::PinMode::OUTPUT);  // or for all pins

        let status = u.read_gpioab().unwrap();
        println!("all {:#?}", status).unwrap();

        let read_a = u.read_gpio(mcp23017::Port::GPIOA).unwrap();
        println!("port a {:#?}", read_a).unwrap();

        match u.write_gpioab(65503){
            Ok(_) => {
                println!("ok").unwrap();
            }
            _ => {
                println!("something wrong").unwrap();
            }
        }
    }
    Err(mcp23017::MCP23017::Error::BusError(error)) => {
        println!("{:#?}", error).unwrap();;
        panic!();
    }
    _ => {
        panic!();
    }
};