Getting bad data on Gamecube controller

[GitMoDu]

Hi, I'm using just the Gamecube controller reader from your library, but I get bad data for every read. If I ignore the validation, I am able to I'm getting everything shifted by bit.

Is there any hardware requirement, like a pull-up resistor, I need to add to get it working properly?
I'm using a MapleMini clone (STM32F108).

EDIT: Ok, so I fiddled a bit with the timming constants and got it working.

halfBitReceiveCycles = cyclesPerUS * 1;