litra.ps1

# Sources:
# - https://ultracrepidarian.phfactor.net/category/computer-science/
# - https://www.reddit.com/r/LogitechG/comments/sacz2x/comment/hyfx2xo/?utm_source=share&utm_medium=web2x&context=3

param (
    [Parameter(Mandatory = $true)]
    [ValidateSet('On', 'Off')]
    [String]$state,

    [ValidateRange(1, 100)]
    [Int]$brightness=50,

    [ValidateRange(2700, 6500)]
    [Int]$temperature=6500
)

function run {
    param ($bytes)
    &"$PSScriptRoot\hidapitester-windows-x86_64\hidapitester.exe" --quiet --vidpid 046D/C900 --usagePage FF43 --open --length 20 --send-output $bytes
}

Write-Host "State: $state, Brightness: $brightness, Temperature: $temperature"

switch ($state) {
    'On' { run('0x11,0xff,0x04,0x1c,0x01') }
    'Off' { run('0x11,0xff,0x04,0x1c,0x00') }
}

if ($state -eq 'On') {
    # Remap brightness from 1-100 to 20-250
    $adjustedBrightness = [Math]::Floor(($brightness - 1) / (100 - 1) * (250 - 20) + 20)
    run("0x11,0xff,0x04,0x4c,0x00,$adjustedBrightness")

    $temperatureAsBytes = [BitConverter]::GetBytes($temperature)
    run("0x11,0xff,0x04,0x9c,$($temperatureAsBytes[1]),$($temperatureAsBytes[0])")
}