Si5351.h and AtTiny3216

[WaynePauly]

The library does not seem to work with the new Microchip AtTiny's, at least with the AtTiny3216, but the Adafruit 5351 library does. I am using Arduino 1.8.15 and MegaTinyCore and the supplied example. The code compiles and runs but the chip does not respond. I have used the library many times before with Nano's and ESP8266's with great success and hoped to port our code to the tiny processors for our balloon trackers.

[SpenceKonde]

I maintain megaTinyCore, and if you have questions on what's going on once you've localized the problem I would be happy to advise.