static int get_center_freq_ht40(unsigned int freq, bool upper) {
unsigned int center = 0;
/*
* For HT40 we have a channel offset of 20 MHz, and the
* center frequency is in the middle: +/- 10 MHz, depending
* on HT40+ or HT40- and whether the channel exists
*/
if (upper && channel_find_index_from_freq(freq + 20) != -1)
center = freq + 10;
else if (!upper && channel_find_index_from_freq(freq - 20) != -1)
center = freq - 10;
return center;
}
bool
channel_init(void) {
/* get available channels */
ifctrl_iwget_freqlist(conf.if_phy, &channels);
conf.channel_initialized = 1;
printf("Got %d Bands, %d Channels:\n", channels.num_bands, channels.num_channels);
for (int i = 0; i < channels.num_channels && i < MAX_CHANNELS; i++)
printf("%s\n", channel_get_string(i));
if (conf.channel_set_num > 0) {
/* configured values */
int ini_idx = channel_find_index_from_chan(conf.channel_set_num);
if (!channel_change(ini_idx, conf.channel_set_width, conf.channel_set_ht40plus))
return false;
} else {
conf.channel_idx = channel_find_index_from_freq(conf.if_freq);
conf.channel_set_num = channel_get_chan(conf.channel_idx);
if (conf.channel_idx < 0)
return true; // not failure
/* try to set max width */
struct band_info b = channel_get_band_from_idx(conf.channel_idx);
if (conf.channel_width != b.max_chan_width) {
printlog("Try to set max channel width %s",
channel_width_string(b.max_chan_width, -1));
// try both HT40+ and HT40- if necessary
if (!channel_change(conf.channel_idx, b.max_chan_width, true) &&
!channel_change(conf.channel_idx, b.max_chan_width, false))
return false;
}
}
return true;
}
bool
channel_init(void) {
/* get available channels */
ifctrl_iwget_freqlist(conf.if_phy, channels);
conf.channel_idx = channel_find_index_from_freq(conf.if_freq);
if (conf.channel_num_initial > 0) {
if (!channel_change(channel_find_index_from_chan(conf.channel_num_initial)))
return false;
} else {
conf.channel_num_initial = channel_get_chan_from_idx(conf.channel_idx);
}
conf.channel_initialized = 1;
return true;
}
