mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "internal/platform/wifi_utils.h"
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namespace location {
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namespace nearby {
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// Utility function to convert channel number to frequency in MHz
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// @param channel to convert
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// @return center frequency in Mhz of the channel, return "kUnspecified" if no
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// match
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// Add band support later
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int WifiUtils::ConvertChannelToFrequencyMhz(int channel, WifiBandType band) {
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if (band == WifiBandType::kUnknown || band == WifiBandType::kBand24Ghz ||
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band == WifiBandType::kBand5Ghz) {
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if (channel == 14) {
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return 2484;
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} else if (channel >= kBand24GhzFirstChNum &&
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channel <= kBand24GhzLastChNum) {
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return ((channel - kBand24GhzFirstChNum) * 5) + kBand24GhzStartFreqMhz;
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} else if (channel >= kBand5GhzFirstChNum &&
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channel <= kBand5GhzLastChNum) {
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return ((channel - kBand5GhzFirstChNum) * 5) + kBand5GhzStartFreqMhz;
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} else {
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return kUnspecified;
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}
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}
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if (band == WifiBandType::kBand6Ghz) {
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if (channel >= kBand6GhzFirstChNum &&
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channel <= kBand6GhzLastChNum) {
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if (channel == 2) {
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return kBand6GhzOpClass136Ch2FreqMhz;
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}
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return ((channel - kBand6GhzFirstChNum) * 5) +
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kBand6GhzStartFreqMhz;
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} else {
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return kUnspecified;
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}
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}
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if (band == WifiBandType::kBand60Ghz) {
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if (channel >= kBand60GhzFirstChNum &&
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channel <= kBand60GhzLastChNum) {
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return ((channel - kBand60GhzFirstChNum) * 2160) +
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kBand60GhzStartFreqMhz;
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} else {
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return kUnspecified;
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}
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}
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return kUnspecified;
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}
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// Utility function to convert frequency in MHz to channel number
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// @param freqMhz frequency in MHz
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// @return channel number associated with given frequency, return "kUnspecified"
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// if no match
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int WifiUtils::ConvertFrequencyMhzToChannel(int freq_mhz) {
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// Special case
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if (freq_mhz == kBand24GhzEndFreqMhz) {
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return 14;
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} else if (freq_mhz >= kBand24GhzStartFreqMhz &&
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freq_mhz <= kBand24GhzEndFreqMhz) {
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return (freq_mhz - kBand24GhzStartFreqMhz) / 5 + kBand24GhzFirstChNum;
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} else if (freq_mhz >= kBand5GhzStartFreqMhz &&
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freq_mhz <= kBand5GhzEndFreqMhz) {
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return (freq_mhz - kBand5GhzStartFreqMhz) / 5 + kBand5GhzFirstChNum;
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} else if (freq_mhz >= kBand6GhzStartFreqMhz &&
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freq_mhz <= kBand6GhzEndFreqMhz) {
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if (freq_mhz == kBand6GhzOpClass136Ch2FreqMhz) {
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return 2;
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}
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return (freq_mhz - kBand6GhzStartFreqMhz) / 5 + kBand6GhzFirstChNum;
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} else if (freq_mhz >= kBand60GhzStartFreqMhz &&
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freq_mhz <= kBand60GhzEndFreqMhz) {
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return (freq_mhz - kBand60GhzStartFreqMhz) / 2160 + kBand60GhzFirstChNum;
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}
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return kUnspecified;
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}
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} // namespace nearby
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} // namespace location
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