Hello all, can anyone confirm if stm32f1xx-hal is missing the spi implementation or if I'm doing something wrong?
I end up on the `todo!()` macros here https://github.com/stm32-rs/stm32f1xx-hal/blob/master/src/spi/hal_1.rs

My implementation
```rust
        let sck = gpioa.pa5;
        let miso = gpioa.pa6;
        let mosi = gpioa.pa7;
        let cs = gpioa.pa4.into_push_pull_output(&mut gpioa.crl);

        let spi1 = device.SPI1.spi(
            (Some(sck), Some(miso), Some(mosi)),
            SpiMode {
                polarity: Polarity::IdleHigh,
                phase: Phase::CaptureOnSecondTransition,
            },
            1.MHz(),
            &mut rcc,
        );

        let spi_device = ExclusiveDevice::new(spi1, cs, &mut delay).unwrap();
        let mut flash = W25x::new(spi_device);
        let id = flash.device_id().unwrap();
```