CH_10MHZ_APART
ch->control_ch_num -= CH_10MHZ_APART;
ch->control_ch_num += CH_10MHZ_APART;
ch->control_ch_num -= CH_10MHZ_APART;
ch->control_ch_num += CH_10MHZ_APART;
ch->control_ch_num -= CH_10MHZ_APART;
ch->control_ch_num += CH_10MHZ_APART;
ch->control_ch_num -= CH_10MHZ_APART;
ch->control_ch_num += CH_10MHZ_APART;
return channel > CH_10MHZ_APART ? (channel - CH_10MHZ_APART) : 0;
return (channel < (MAXCHANNEL - CH_10MHZ_APART)) ?
channel + CH_10MHZ_APART : 0;