bd_init(&ballboard.roller.bd);
#define ROLLER_SPEED_THRES (ROLLER_SPEED * 0.75)
bd_set_speed_threshold(&ballboard.roller.bd, ROLLER_SPEED_THRES);
bd_init(&ballboard.roller.bd);
#define ROLLER_SPEED_THRES (ROLLER_SPEED * 0.75)
bd_set_speed_threshold(&ballboard.roller.bd, ROLLER_SPEED_THRES);