119 lines
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4.183kb
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// |
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// UMProtocol.swift |
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// USB Meter |
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// |
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// Created by Codex on 23/03/2026. |
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// |
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import Foundation |
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struct UMDataGroupTotals {
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let ah: Double |
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let wh: Double |
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} |
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struct UMSnapshot {
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let modelNumber: UInt16 |
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let voltage: Double |
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let current: Double |
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let power: Double |
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let temperatureCelsius: Double |
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let temperatureFahrenheit: Double |
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let selectedDataGroup: UInt8 |
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let dataGroupRecords: [Int: UMDataGroupTotals] |
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let usbPlusVoltage: Double |
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let usbMinusVoltage: Double |
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let chargerTypeIndex: UInt16 |
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let recordedAH: Double |
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let recordedWH: Double |
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let recordingThreshold: Double |
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let recordingDuration: UInt32 |
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let recording: Bool |
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let screenTimeout: Int |
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let screenBrightness: Int |
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let loadResistance: Double |
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let currentScreen: UInt16 |
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} |
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enum UMProtocolError: Error {
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case invalidPayloadLength(Int) |
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} |
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enum UMProtocol {
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static let minimumSnapshotLength = 128 |
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static let snapshotRequest = Data([0xF0]) |
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static let nextScreen = Data([0xF1]) |
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static let rotateScreen = Data([0xF2]) |
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static let previousScreen = Data([0xF3]) |
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static let clearCurrentGroup = Data([0xF4]) |
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static func selectDataGroup(_ id: UInt8) -> Data {
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Data([0xA0 | id]) |
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} |
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static func setScreenBrightness(_ value: UInt8) -> Data {
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Data([0xD0 | value]) |
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} |
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static func setScreenSaverTimeout(_ value: UInt8) -> Data {
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Data([0xE0 | value]) |
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} |
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static func setRecordingThreshold(_ value: UInt8) -> Data {
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Data([0xB0 + value]) |
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} |
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static func parseSnapshot(from buffer: Data, model: Model) throws -> UMSnapshot {
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guard buffer.count >= minimumSnapshotLength else {
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throw UMProtocolError.invalidPayloadLength(buffer.count) |
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} |
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let modelNumber = UInt16(bigEndian: buffer.value(from: 0)) |
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let voltageScale: Double |
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let currentScale: Double |
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switch model {
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case .UM25C: |
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voltageScale = 1000 |
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currentScale = 10000 |
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case .UM34C: |
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voltageScale = 100 |
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currentScale = 1000 |
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case .TC66C: |
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voltageScale = 1 |
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currentScale = 1 |
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} |
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var dataGroupRecords: [Int: UMDataGroupTotals] = [:] |
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for index in stride(from: 0, through: 9, by: 1) {
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let offset = 16 + index * 8 |
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dataGroupRecords[index] = UMDataGroupTotals( |
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ah: Double(UInt32(bigEndian: buffer.value(from: offset))) / 1000, |
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wh: Double(UInt32(bigEndian: buffer.value(from: offset + 4))) / 1000 |
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) |
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} |
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return UMSnapshot( |
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modelNumber: modelNumber, |
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voltage: Double(UInt16(bigEndian: buffer.value(from: 2))) / voltageScale, |
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current: Double(UInt16(bigEndian: buffer.value(from: 4))) / currentScale, |
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power: Double(UInt32(bigEndian: buffer.value(from: 6))) / 1000, |
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temperatureCelsius: Double(UInt16(bigEndian: buffer.value(from: 10))), |
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temperatureFahrenheit: Double(UInt16(bigEndian: buffer.value(from: 12))), |
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selectedDataGroup: UInt8(UInt16(bigEndian: buffer.value(from: 14))), |
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dataGroupRecords: dataGroupRecords, |
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usbPlusVoltage: Double(UInt16(bigEndian: buffer.value(from: 96))) / 100, |
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usbMinusVoltage: Double(UInt16(bigEndian: buffer.value(from: 98))) / 100, |
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chargerTypeIndex: UInt16(bigEndian: buffer.value(from: 100)), |
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recordedAH: Double(UInt32(bigEndian: buffer.value(from: 102))) / 1000, |
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recordedWH: Double(UInt32(bigEndian: buffer.value(from: 106))) / 1000, |
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recordingThreshold: Double(UInt16(bigEndian: buffer.value(from: 110))) / 100, |
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recordingDuration: UInt32(bigEndian: buffer.value(from: 112)), |
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recording: UInt16(bigEndian: buffer.value(from: 116)) == 1, |
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screenTimeout: Int(UInt16(bigEndian: buffer.value(from: 118))), |
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screenBrightness: Int(UInt16(bigEndian: buffer.value(from: 120))), |
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loadResistance: Double(UInt32(bigEndian: buffer.value(from: 122))) / 10, |
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currentScreen: UInt16(bigEndian: buffer.value(from: 126)) |
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) |
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} |
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} |