Mindboards

I create a pure c application to test my mindsensor psp controller
https://gist.github.com/topikachu/7319065

It only works after set correct DEVCON, and dcm pin mode must be 'F'

If I skip any step or set another pin mode, I only get garbage data from IIC

Does anybody know what the 'F' mode is?

Hi,
As I test, to enable my mindsensor PS2 controller interface IIC sensor, I need to setup the pin mode to 'F'.
And there are a lot of 'F'(0x46) in the ev3 device list http://python-ev3.org/types.html

I'd like to know what this 'F' means.

Thanks