So something like:

```rust
let data = defmt::unwrap!(future::poll_fn(|cx| {
    buf = unsafe { buf_ptr.read() };
    if buf.is_empty() {
        // store the waker so when the interrupt occurs, it can wake us
        // also maybe enable the interrupt unless it is always enabled?
        resources.waker = Some(cx.waker());
        Poll::Pending
    } else {
        Poll::Ready(buf.dequeue())
    }
})
.await
```