编写chrome扩展来控制串口

I want to write a chrome extension (not chrome app) to control serial port but chrome extension doesnt provide any api to access it. Because chrome doesnt give permission to direct access the port, I thought I can write C code that control the serial port and then I use this C code in the extension. I found several method to use C codes in the chrome extension. These are;I want to write a chrome extension (not chrome