library for si4063 and sample gfsk code

[charlee120]

Hi everyone,

We're currently working on a project that uses the Si4063 RF transmitter IC (from the Silicon Labs EZRadioPRO family), and we're running into trouble finding a good library or even basic example code to get started.

We've gone through the official programming guide (AN633) and understand the general SPI-based command structure—using POWER_UP, SET_PROPERTY, etc.—but setting up the device and getting it to transmit reliably has been challenging.

If anyone has:

A working library or driver (C/C++)

Example code showing packet transmission with FSK/GFSK

Tips on handling CTS, NIRQ, and radio_config.h generation via WDS

We’d love to learn from your experience. Even a minimal working example would be a huge help!

Thanks in advance to anyone who can point us in the right direction. 🙏