* Hi all, how important is this particular clock speed? See the 100Mhz setting in the blinky example below.  I'm wondering if this is causing some instability (see https://forum.arduino.cc/t/flashing-bin-file-for-blinky-demo-for-blue-led-gets-stuck-on-first-power-cycle/1218080)

#\[entry\]
fn main() -> ! {
let cp = cortex\_m::Peripherals::take().unwrap();
let dp = pac::Peripherals::take().unwrap();

```
// Constrain and Freeze power
info!("Setup PWR...                  ");
let pwr = dp.PWR.constrain();
let mut pwrcfg = pwr.freeze();

// Take the backup power domain
let backup = pwrcfg.backup().unwrap();

// Constrain and Freeze clock
info!("Setup RCC...                  ");
let rcc = dp.RCC.constrain();
let ccdr = rcc.sys_ck(100.MHz()).freeze(pwrcfg, &dp.SYSCFG);

info!("");
info!("stm32h7xx-hal example - Blinky");
info!("");

let gpioe = dp.GPIOE.split(ccdr.peripheral.GPIOE);

// Configure PE3     as output.
let mut led = gpioe.pe3.into_push_pull_output();

// Get the delay provider.
let mut delay = cp.SYST.delay(ccdr.clocks);a

loop {
    led.set_high();
    delay.delay_ms(1000_u16);

    led.set_low();
    delay.delay_ms(1000_u16);
}
```

}