/* * Control channel position: * For legacy set bit means upper channel, otherwise lower. * For VHT - bit-2 marks if the control is lower/upper relative to center-freq * bits-1:0 mark the distance from the center freq. for 20Mhz, offset is 0. * center_freq * | * 40Mhz |_______|_______| * 80Mhz |_______|_______|_______|_______| * 160Mhz |_______|_______|_______|_______|_______|_______|_______|_______| * code 011 010 001 000 | 100 101 110 111 */