i mean, i know i've said this a few times already, but you should really look at the code you're using when it doesn't behave how you expect.
if you had, you might have seen this:

```rust
    /// Pull data from RX FIFO.
    pub fn pull(&mut self) -> u32 {
        PIO::PIO.rxf(SM).read()
    }

    /// Attempt pulling data from RX FIFO.
    pub fn try_pull(&mut self) -> Option<u32> {
        if self.empty() {
            return None;
        }
        Some(self.pull())
    }
```

which would have revealed that it just directly calls the pac