gistfile1.rs

enum GPIO {
    GPIO0,
    GPIO1,
}

static GPIO0_ADDR: *mut Regs = 0xDEADBEEF as *mut Regs;
static GPIO1_ADDR: *mut Regs = 0xBEEFDEAD as *mut Regs;

impl GPIO {
    fn get_addr(self) -> *mut Regs {
        match self {
            GPIO0 => GPIO0_ADDR,
            GPIO1 => GPIO1_ADDR,
        }
    }

    fn FIODIR(self) -> u32 { (*self.get_addr()).FIODIR() }
}

//usage
fn main(){
    GPIO0.FIODIR();
}