* Do you have an example API? I'm having a tough time understanding the application from the article.  I gather the distinction is `Pin control` is defined as configuration, while `GPIO` is a subset of high vs low state. Would this be an example of GPIO, and not pin control?:

```rust
impl StatusLed {
    fn port_pin(&self) -> (Port, u8) {
        match self {
            Self::Fix => (Port::B, 3),
            Self::GnssBroadcast => (Port::B, 13),
            Self::FusedPositBroadcast => (Port::B, 14),
            // ... etc
        }
    }

    pub fn turn_on(&self) {
        let (port, pin) = self.port_pin();
        gpio::set_high(port, pin);
    }
    pub fn turn_off(&self) {
        let (port, pin) = self.port_pin();
        gpio::set_low(port, pin);
    }
}
```