Long story short, I trusted the datasheet (big mistake) where it says an external crystal is optional. In previous builds, I had an external crystal onboard anyway, so this issue never arose, but now I don't want an external crystal, but it turns out the "optional" marking in the datasheet really means "there's no easy way to do this, oh ya, and no clear guide either".
1. I have no external crystal oscillator, how can I use USB as an HID device still?
2. Can I still use BLE reliably without the external crystal? I'm depending on 7.5ms intervals, 16 Kb/s throughput.
Please don't paste minute code snippets without telling me where to paste them. Thank you!
