mirror of
https://github.com/meshtastic/Meshtastic-Android.git
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104 lines
3.5 KiB
Kotlin
104 lines
3.5 KiB
Kotlin
package com.geeksville.mesh.model
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import com.geeksville.mesh.ConfigProtos.Config.LoRaConfig
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import com.geeksville.mesh.ConfigProtos.Config.LoRaConfig.ModemPreset
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import com.geeksville.mesh.ConfigProtos.Config.LoRaConfig.RegionCode
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import com.geeksville.mesh.R
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/**
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* hash a string into an integer using the djb2 algorithm by Dan Bernstein
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* http://www.cse.yorku.ca/~oz/hash.html
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*/
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private fun hash(name: String): UInt { // using UInt instead of Long to match RadioInterface.cpp results
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var hash: UInt = 5381u
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for (c in name) {
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hash += (hash shl 5) + c.code.toUInt()
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}
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return hash
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}
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private val ModemPreset.bandwidth: Float
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get() {
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for (option in ChannelOption.entries) {
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if (option.modemPreset == this) return option.bandwidth
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}
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return 0f
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}
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private fun LoRaConfig.bandwidth() = if (usePreset) {
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val wideLora = region == RegionCode.LORA_24
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modemPreset.bandwidth * if (wideLora) 3.25f else 1f
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} else when (bandwidth) {
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31 -> .03125f
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62 -> .0625f
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200 -> .203125f
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400 -> .40625f
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800 -> .8125f
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1600 -> 1.6250f
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else -> bandwidth / 1000f
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}
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val LoRaConfig.numChannels: Int get() {
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for (option in RegionInfo.entries) {
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if (option.regionCode == region)
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return ((option.freqEnd - option.freqStart) / bandwidth()).toInt()
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}
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return 0
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}
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internal fun LoRaConfig.channelNum(primaryName: String): Int {
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return if (channelNum != 0) channelNum
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else (hash(primaryName) % numChannels.toUInt()).toInt() + 1
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}
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internal fun LoRaConfig.radioFreq(channelNum: Int): Float {
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if (overrideFrequency != 0f) return overrideFrequency + frequencyOffset
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for (option in RegionInfo.entries) {
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if (option.regionCode == region)
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return (option.freqStart + bandwidth() / 2) + (channelNum - 1) * bandwidth()
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}
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return 0f
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}
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enum class RegionInfo(
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val regionCode: RegionCode,
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val freqStart: Float,
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val freqEnd: Float,
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) {
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US(RegionCode.US, 902.0f, 928.0f),
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EU_433(RegionCode.EU_433, 433.0f, 434.0f),
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EU_868(RegionCode.EU_868, 869.4f, 869.65f),
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CN(RegionCode.CN, 470.0f, 510.0f),
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JP(RegionCode.JP, 920.8f, 927.8f),
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ANZ(RegionCode.ANZ, 915.0f, 928.0f),
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RU(RegionCode.RU, 868.7f, 869.2f),
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KR(RegionCode.KR, 920.0f, 923.0f),
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TW(RegionCode.TW, 920.0f, 925.0f),
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IN(RegionCode.IN, 865.0f, 867.0f),
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NZ_865(RegionCode.NZ_865, 864.0f, 868.0f),
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TH(RegionCode.TH, 920.0f, 925.0f),
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UA_433(RegionCode.UA_433, 433.0f, 434.7f),
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UA_868(RegionCode.UA_868, 868.0f, 868.6f),
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MY_433(RegionCode.MY_433, 433.0f, 435.0f),
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MY_919(RegionCode.MY_919, 919.0f, 924.0f),
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SG_923(RegionCode.SG_923, 917.0f, 925.0f),
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LORA_24(RegionCode.LORA_24, 2400.0f, 2483.5f),
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UNSET(RegionCode.UNSET, 902.0f, 928.0f),
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;
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}
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enum class ChannelOption(
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val modemPreset: ModemPreset,
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val configRes: Int,
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val bandwidth: Float,
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) {
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SHORT_FAST(ModemPreset.SHORT_FAST, R.string.modem_config_short, .250f),
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SHORT_SLOW(ModemPreset.SHORT_SLOW, R.string.modem_config_slow_short, .250f),
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MEDIUM_FAST(ModemPreset.MEDIUM_FAST, R.string.modem_config_medium, .250f),
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MEDIUM_SLOW(ModemPreset.MEDIUM_SLOW, R.string.modem_config_slow_medium, .250f),
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LONG_FAST(ModemPreset.LONG_FAST, R.string.modem_config_long, .250f),
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LONG_MODERATE(ModemPreset.LONG_MODERATE, R.string.modem_config_mod_long, .125f),
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LONG_SLOW(ModemPreset.LONG_SLOW, R.string.modem_config_slow_long, .125f),
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VERY_LONG_SLOW(ModemPreset.VERY_LONG_SLOW, R.string.modem_config_very_long, .0625f),
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;
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}
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