param(
    [string]$Port = "COM18",
    [int]$Baud = 115200
)

$ErrorActionPreference = "Stop"
$here = Split-Path -Parent $MyInvocation.MyCommand.Path
$bin = Join-Path $here "build\hub75_80x40.bin"

if (-not (Test-Path $bin)) {
    throw "Firmware not found: $bin`nRun make in stm32f103zet6 first."
}

python -m pip show stm32loader *> $null
if ($LASTEXITCODE -ne 0) {
    python -m pip install stm32loader
}

Write-Host "Flashing $bin to $Port"
Write-Host "BOOT0 must be at 3.3V, then press RESET before this script."
python -m stm32loader -p $Port -b $Baud -e -w -v $bin -g 0x08000000
if ($LASTEXITCODE -ne 0) {
    throw "Flash failed. Set BOOT0 to 3.3V, press RESET, and confirm $Port is the CH340."
}

Write-Host "Flash done. Move BOOT0 back to GND and press RESET."