Has any one done it or successfully written code to control the Si5351?
Pete
Hi there,Pete, and Welcome.
Have a look a Jeffs work here, on it he has built several things with that part in mind.
HTH
GL 
PJ
I was successful in getting the Xiao to Control an Si5351 PLL for use in a ham radio project.
There is a short video on you tube. https://youtube.com/shorts/tGhtbbDg6iI
It is not a simple port over from Arduino code. But this was my 1st so maybe the next one will be easier/.
Pete N6QW
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Hi there,
73…
Nice work.
PJ