After long time with Atmel AVR MCU i decide to try SiLabs.
More resources with less size! Only need developer tools - and if with no problem with software then hardware need money.
General tools - USB Debug Adapter ($60) or ToolStick Base Adapter ($37) + ToolStick Debug Adapter ($21) with delivery time 2-3 weeks.
 

I use other way to start with Silabs.
Design ToolStick BA + DA pin compatible board with C8051F342 chip (with PCB USB connector).
 

ToolStick Debug Adapter firmware available from Silabs site (as part of USB Debug Adapter Firmware Reset.exe).
Original use C8051F321 chip - but no problem with port to F342 chip.
Only one problem - How to program first adapter ?
I use Arduino compatible board (handmake pcb with single ATmeage168P chip).
Create AVR program for control C2 bus.

Also C# frontend
  

Download Blink sample to adapter and see results.

Next step - test Debug Adapter firmware on F342 chip.