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Add note about #[interrupt] mut -> &mut transform

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Co-authored-by: Jan Niehusmann <github@gondor.com>
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9names 2022-02-16 22:48:52 +11:00 • committed by GitHub
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rp2040-hal/examples/gpio_irq_example.rs
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@ -157,6 +157,7 @@ fn main() -> ! {
#[interrupt]
fn IO_IRQ_BANK0() {
// The `#[interrupt]` attribute covertly converts this to `&'static mut Option<LedAndButton>`
static mut LED_AND_BUTTON: Option<LedAndButton> = None;
// This is one-time lazy initialisation. We steal the variables given to us