bwn_phy_g_chan2freq
static uint16_t bwn_phy_g_chan2freq(uint8_t);
BWN_WRITE_2(mac, BWN_CHANNEL, bwn_phy_g_chan2freq(channel));
bwn_phy_g_chan2freq(channel + 4) : bwn_phy_g_chan2freq(1));
BWN_WRITE_2(mac, BWN_CHANNEL, bwn_phy_g_chan2freq(channel));