Beacon reference design

Hi,
I want to use a Sensor with I2C interface along with the beacon. I am working with Beacon reference design as my starting point. Although whenever i try to configure pins for i2c bus the beacon stops advertising for unknown reasons. The only change that i have made in the Beacon Reference design is in the periph_setup.c in the function set_pad where peripheral pins are assigned for beacon reference design. The changes made are:
//Code Snippet start
void set_pad_functions(void) // set gpio port function mode
{