Finally i got it  
I found this good example how to create an Arduino Miner:
https://github.com/joric/arduino-bitcoin-miner

It is mining at 45 H/s so i think it is the more useless and slower miner ever   ... but i like it  

It is emulating an Icarus FPGA but i don't know why my BFGMiner is saying it is mining at 360MH/s  
Do you have any idea?
This is a screenshot of BFGMiner
https://imgur.com/a/NuaXQa0

thank you sidehack...
my problem is how to create a "driver" to use my device with cfgminer 

Hi all,
i already know that bitcoin mining is remunerative (maybe) only with ASIC hardware but... i like to develop hardware and firmware so, just for fun, i'd like to create an USB powered device that use microcontroller to "emulate" actual ASIC.
My target is to realize a useless Mh/s device (other than a GPU miner) 
I know they use USB/UART converter to comunicate and this is easy, but where i can find protocol and commands it has to respond to?

Thank you