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Provide a better example which shows the usage of singleton! #385

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Provide a better example which shows the usage of singleton! #385

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11 changes: 9 additions & 2 deletions src/peripherals/singletons.md
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Original file line number Diff line number Diff line change
Expand Up @@ -65,8 +65,15 @@ use cortex_m::singleton;

fn main() {
// OK if `main` is executed only once
let x: &'static mut bool =
singleton!(: bool = false).unwrap();
let peripherals: &'static mut Peripherals =
singleton!(: Peripherals = Peripherals {
serial: Some(SerialPort),
})
.expect("Peripherals already taken!");

let serial_1 = peripherals.take_serial();
// This panics!
// let serial_2 = peripherals.take_serial();
}
```

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