@japaricious I'm having a lot of difficulty getting "new" cortex-m-rtfm and blue-pill working together. I think you've changed a lot :(

Patience. Stable versions and blog post should come out today.

Blog looked interesting. I've cloned blue-pill and am trying the loopback example, but it keeps stopping in a bkpt in default handler.

Is there a reasonably easy way to tell which interrupt got me there?