for fairness:
```rust
    let config = {
        let rcc = {
            use hal::rcc::*;
            let mut rcc = Config::default();
            rcc.hsi = false;
            rcc.hse = Some(Hse {
                freq: mhz(8),
                mode: HseMode::Oscillator,
            });
            rcc.sys = Sysclk::PLL1_P;
            rcc.pll = Some(Pll {
                src: PllSource::HSE,
                prediv: PllPreDiv::DIV1,
                mul: PllMul::MUL9,
            });
            rcc.ahb_pre = AHBPrescaler::DIV1;
            rcc.apb1_pre = APBPrescaler::DIV2;
            rcc.apb2_pre = APBPrescaler::DIV1;
            rcc.adc_pre = ADCPrescaler::DIV6;
            // rcc.ls = todo!();
            rcc
        };

        let mut config = hal::Config::default();
        config.rcc = rcc;
        config.enable_debug_during_sleep = true;
        config
    };
```