// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Utility for converting frequencies into their related channel.
*/
import {ChannelBand, ChannelProperties} from './diagnostics_types.js';
/**
* Map of keyed on center frequency with values of related channel for 5GHz.
* Not all channels are used in all countries. Channels which are not used in
* any country have been excluded.
*/
const CHANNELS: Map<number, ChannelProperties> = new Map([
[2412, {channel: 1, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2417, {channel: 2, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2422, {channel: 3, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2427, {channel: 4, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2432, {channel: 5, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2437, {channel: 6, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2442, {channel: 7, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2447, {channel: 8, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2452, {channel: 9, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2457, {channel: 10, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2462, {channel: 11, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2467, {channel: 12, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2472, {channel: 13, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[2484, {channel: 14, band: ChannelBand.TWO_DOT_FOUR_GHZ}],
[5160, {channel: 32, band: ChannelBand.FIVE_GHZ}],
[5170, {channel: 34, band: ChannelBand.FIVE_GHZ}],
[5180, {channel: 36, band: ChannelBand.FIVE_GHZ}],
[5190, {channel: 38, band: ChannelBand.FIVE_GHZ}],
[5200, {channel: 40, band: ChannelBand.FIVE_GHZ}],
[5210, {channel: 42, band: ChannelBand.FIVE_GHZ}],
[5220, {channel: 44, band: ChannelBand.FIVE_GHZ}],
[5230, {channel: 46, band: ChannelBand.FIVE_GHZ}],
[5240, {channel: 48, band: ChannelBand.FIVE_GHZ}],
[5250, {channel: 50, band: ChannelBand.FIVE_GHZ}],
[5260, {channel: 52, band: ChannelBand.FIVE_GHZ}],
[5270, {channel: 54, band: ChannelBand.FIVE_GHZ}],
[5280, {channel: 56, band: ChannelBand.FIVE_GHZ}],
[5290, {channel: 58, band: ChannelBand.FIVE_GHZ}],
[5300, {channel: 60, band: ChannelBand.FIVE_GHZ}],
[5310, {channel: 62, band: ChannelBand.FIVE_GHZ}],
[5320, {channel: 64, band: ChannelBand.FIVE_GHZ}],
[5340, {channel: 68, band: ChannelBand.FIVE_GHZ}],
[5480, {channel: 96, band: ChannelBand.FIVE_GHZ}],
[5500, {channel: 100, band: ChannelBand.FIVE_GHZ}],
[5510, {channel: 102, band: ChannelBand.FIVE_GHZ}],
[5520, {channel: 104, band: ChannelBand.FIVE_GHZ}],
[5530, {channel: 106, band: ChannelBand.FIVE_GHZ}],
[5540, {channel: 108, band: ChannelBand.FIVE_GHZ}],
[5550, {channel: 110, band: ChannelBand.FIVE_GHZ}],
[5560, {channel: 112, band: ChannelBand.FIVE_GHZ}],
[5570, {channel: 114, band: ChannelBand.FIVE_GHZ}],
[5580, {channel: 116, band: ChannelBand.FIVE_GHZ}],
[5590, {channel: 118, band: ChannelBand.FIVE_GHZ}],
[5600, {channel: 120, band: ChannelBand.FIVE_GHZ}],
[5610, {channel: 122, band: ChannelBand.FIVE_GHZ}],
[5620, {channel: 124, band: ChannelBand.FIVE_GHZ}],
[5630, {channel: 126, band: ChannelBand.FIVE_GHZ}],
[5640, {channel: 128, band: ChannelBand.FIVE_GHZ}],
[5660, {channel: 132, band: ChannelBand.FIVE_GHZ}],
[5670, {channel: 134, band: ChannelBand.FIVE_GHZ}],
[5680, {channel: 136, band: ChannelBand.FIVE_GHZ}],
[5690, {channel: 138, band: ChannelBand.FIVE_GHZ}],
[5700, {channel: 140, band: ChannelBand.FIVE_GHZ}],
[5710, {channel: 142, band: ChannelBand.FIVE_GHZ}],
[5720, {channel: 144, band: ChannelBand.FIVE_GHZ}],
[5745, {channel: 149, band: ChannelBand.FIVE_GHZ}],
[5755, {channel: 151, band: ChannelBand.FIVE_GHZ}],
[5765, {channel: 153, band: ChannelBand.FIVE_GHZ}],
[5775, {channel: 155, band: ChannelBand.FIVE_GHZ}],
[5785, {channel: 157, band: ChannelBand.FIVE_GHZ}],
[5795, {channel: 159, band: ChannelBand.FIVE_GHZ}],
[5805, {channel: 161, band: ChannelBand.FIVE_GHZ}],
[5815, {channel: 163, band: ChannelBand.FIVE_GHZ}],
[5825, {channel: 165, band: ChannelBand.FIVE_GHZ}],
[5835, {channel: 167, band: ChannelBand.FIVE_GHZ}],
[5845, {channel: 169, band: ChannelBand.FIVE_GHZ}],
[5855, {channel: 171, band: ChannelBand.FIVE_GHZ}],
[5865, {channel: 173, band: ChannelBand.FIVE_GHZ}],
[5875, {channel: 175, band: ChannelBand.FIVE_GHZ}],
[5885, {channel: 177, band: ChannelBand.FIVE_GHZ}],
[5900, {channel: 180, band: ChannelBand.FIVE_GHZ}],
[5910, {channel: 182, band: ChannelBand.FIVE_GHZ}],
[5915, {channel: 183, band: ChannelBand.FIVE_GHZ}],
[5920, {channel: 184, band: ChannelBand.FIVE_GHZ}],
[5935, {channel: 187, band: ChannelBand.FIVE_GHZ}],
[5940, {channel: 188, band: ChannelBand.FIVE_GHZ}],
[5945, {channel: 189, band: ChannelBand.FIVE_GHZ}],
[5960, {channel: 192, band: ChannelBand.FIVE_GHZ}],
[5980, {channel: 196, band: ChannelBand.FIVE_GHZ}],
]);
/**
* Determines channel based on |frequency| which is expected to match the
* channel center frequency. In all other cases return null.
*/
export function convertFrequencyToChannel(frequency: number): number|null {
const channelProperties: ChannelProperties|undefined =
CHANNELS.get(frequency);
return channelProperties ? channelProperties.channel : null;
}
export function getFrequencyChannelBand(frequency: number): ChannelBand {
const channelProperties: ChannelProperties|undefined =
CHANNELS.get(frequency);
return channelProperties ? channelProperties.band : ChannelBand.UNKNOWN;
}
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