urtw_rate2rtl
basic_rate = urtw_rate2rtl(48);
min_rr_rate = urtw_rate2rtl(12);
max_rr_rate = urtw_rate2rtl(48);
data->buf[2] |= (urtw_rate2rtl(2) << 3);
data->buf[3] = urtw_rate2rtl(ni->ni_rates.rs_rates[0]);
data->buf[3] = urtw_rate2rtl(ic->ic_fixed_rate);
uint16_t urtw_rate2rtl(int rate);