CDR_MAX_SPEED
error = cdsetspeed(periph, *(u_int32_t *)addr, CDR_MAX_SPEED);
error = cdsetspeed(periph, CDR_MAX_SPEED, *(u_int32_t *)addr);
error = acd_set_speed(dev, speed, CDR_MAX_SPEED);
error = acd_set_speed(dev, CDR_MAX_SPEED, speed);
speed = CDR_MAX_SPEED;
speed = CDR_MAX_SPEED;