@echo off
setlocal

set PROJ=%~dp0STM32F407-Demo.uvprojx
set LOG=%~dp0download_log.txt
set TARGET=STM32F407-Demo

:: UV4 location: env var DTU_KEIL_UV4 = full path of UV4.exe (same contract
:: as build.bat; required, no machine-default fallback).
if defined DTU_KEIL_UV4 goto uv4_set
echo DOWNLOAD_FAIL: environment variable DTU_KEIL_UV4 is not set
echo Set it to the full path of UV4.exe, e.g.:
echo   [Environment]::SetEnvironmentVariable('DTU_KEIL_UV4', 'D:\Tools\Keil\UV4\UV4.exe', 'User')
exit /b 2

:uv4_set
if exist "%DTU_KEIL_UV4%" goto uv4_ok
echo ENV_ERROR: DTU_KEIL_UV4 is set but does not exist: "%DTU_KEIL_UV4%"
echo Fix the variable value. No fallback to another UV4 install is attempted.
exit /b 2

:uv4_ok
set UV4=%DTU_KEIL_UV4%

:: Remove stale log first: UV4 -o writes the log only when a download actually
:: runs. A leftover log would otherwise be misreported as this download's
:: result (same guard as build.bat).
if exist "%LOG%" del "%LOG%"

"%UV4%" -f "%PROJ%" -t%TARGET% -j0 -o "%LOG%"

if not exist "%LOG%" (
    echo DOWNLOAD_FAIL: no download log produced - UV4 did not run or hung
    exit /b 1
)

findstr /C:"Application running" "%LOG%" >nul
if %ERRORLEVEL% equ 0 (
    echo DOWNLOAD_OK: flashed and running
    exit /b 0
)

echo DOWNLOAD_FAIL: no application-running marker in log
type "%LOG%"
exit /b 1