use Pca9554::{Pca9554, Address, Port};

// Obtain an i2c bus using embedded-hal
// let mut i2c = ...;

// Note that the handle does *not* capture the i2c bus
// object and that the i2c bus object must be supplied for each method call.
// This slight inconvenience allows sharing the i2c bus between peripherals.
let gpio = Pca9554::new(&i2c, Address::ADDR_0x20);

// Set all outputs low
gpio.clear_outputs(&mut i2c)?;

// Set port P01 and P05 as inputs and the rest as outputs.
gpio.write_config(&mut i2c, Port::P01 | Port::P05)?;

// Read pin input logic levels
let inputs = gpio.read_inputs(&mut i2c)?;

// Do something if port P01 is high:
if inputs & Port::P01 {
    // ...
}