Update CCS12 peripheral firmware and documentation

Doc/build.bat

@@ -0,0 +1,64 @@
+@echo off
+rem Builds the local HTML overview and Doxygen API reference in Doc\build.
+rem Prefers the pinned Doc\.tools Doxygen, then falls back to a system install.
+rem If Doxygen is unavailable, installs the explanatory API placeholder instead.
+setlocal EnableExtensions
+
+set "DOC_DIR=%~dp0"
+set "SOURCE=%DOC_DIR%index.html"
+set "BUILD_DIR=%DOC_DIR%build"
+set "OVERVIEW=%BUILD_DIR%\index.html"
+set "DOXYGEN_EXE=%DOC_DIR%.tools\doxygen-1.18.0\doxygen.exe"
+
+echo [BALSAM 167] Building HTML documentation...
+
+if not exist "%SOURCE%" (
+    echo [ERROR] Source HTML not found:
+    echo         %SOURCE%
+    exit /b 1
+)
+
+if not exist "%BUILD_DIR%" mkdir "%BUILD_DIR%"
+if errorlevel 1 (
+    echo [ERROR] Cannot create build directory:
+    echo         %BUILD_DIR%
+    exit /b 2
+)
+
+copy /Y "%SOURCE%" "%OVERVIEW%" >nul
+if errorlevel 1 (
+    echo [ERROR] Cannot build overview HTML.
+    exit /b 3
+)
+
+if not exist "%DOXYGEN_EXE%" (
+    where doxygen >nul 2>nul
+    if not errorlevel 1 set "DOXYGEN_EXE=doxygen"
+)
+
+if not exist "%DOXYGEN_EXE%" if /I not "%DOXYGEN_EXE%"=="doxygen" (
+    if not exist "%BUILD_DIR%\api\html" mkdir "%BUILD_DIR%\api\html"
+    copy /Y "%DOC_DIR%api-unavailable.html" "%BUILD_DIR%\api\html\index.html" >nul
+    echo [WARN] Doxygen is not installed; API reference was not regenerated.
+    echo [OK]   Overview: %OVERVIEW%
+    exit /b 0
+)
+
+pushd "%DOC_DIR%"
+"%DOXYGEN_EXE%" Doxyfile
+set "DOXYGEN_RESULT=%ERRORLEVEL%"
+popd
+
+if not "%DOXYGEN_RESULT%"=="0" (
+    echo [ERROR] Doxygen failed with code %DOXYGEN_RESULT%.
+    exit /b %DOXYGEN_RESULT%
+)
+
+if not exist "%BUILD_DIR%\api\html\index.html" (
+    echo [ERROR] Doxygen did not create the expected API index.
+    exit /b 4
+)
+
+echo [OK] Overview: %OVERVIEW%
+echo [OK] API:      %BUILD_DIR%\api\html\index.html
+exit /b 0