diff --git a/.gitignore b/.gitignore
index 97e2ef4..0cdf3cb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 working/
-reports/
\ No newline at end of file
+reports/
+*__pycache__*
+*.venv
+.doit.db
diff --git a/dodo.py b/dodo.py
new file mode 100644
index 0000000..ae3feb5
--- /dev/null
+++ b/dodo.py
@@ -0,0 +1,78 @@
+from pathlib import Path
+from tasks.generate_prj import generate_prj
+from tasks.generate_scr import generate_scr
+from tools.config import parse_project_cfg
+from tools.defaults import with_defaults
+import subprocess
+import os
+from pathlib import Path
+
+HERE = Path(__file__).parent.resolve()  # Verzeichnis, in dem dodo.py liegt
+CFG_PATH = HERE.parent / "project.cfg"
+TOML_PATH = HERE.parent / "vhdl_ls.toml"
+
+
+def _get_project_name(cfg_path: Path) -> str:
+    return with_defaults(parse_project_cfg(cfg_path))["PROJECT"]
+
+
+def task_generate_prj():
+    cfg_path = Path(CFG_PATH)
+    toml_path = Path(TOML_PATH)
+    project = _get_project_name(cfg_path)
+    prj_path = Path("working") / f"{project}.prj"
+
+    return {
+        "actions": [(generate_prj, [prj_path, cfg_path, toml_path])],
+        "file_dep": [cfg_path, toml_path],
+        "targets": [prj_path],
+        "verbosity": 2,
+    }
+
+
+def task_generate_scr():
+    cfg_path = Path(CFG_PATH)
+    project = _get_project_name(cfg_path)
+    scr_path = Path("working") / f"{project}.scr"
+
+    return {
+        "actions": [(generate_scr, [scr_path, cfg_path])],
+        "file_dep": [cfg_path],
+        "targets": [scr_path],
+        "verbosity": 2,
+    }
+
+
+def task_xst():
+    """Run XST synthesizer"""
+    cfg_path = Path(CFG_PATH)
+    cfg = with_defaults(parse_project_cfg(cfg_path))
+
+    build_dir = Path(cfg["BUILD_DIR"])
+    project = cfg["PROJECT"]
+    scr_file = f"{project}.scr"
+    scr_path = build_dir / scr_file
+    prj_path = build_dir / f"{project}.prj"
+    xilinx_path = Path(cfg["XILINX"])
+    xilinx_platform = "lin64"  # TODO: dynamisch ermitteln, falls nötig
+
+    xst_exe = xilinx_path / "bin" / xilinx_platform / "xst"
+    common_opts = cfg.get("COMMON_OPTS", "")
+
+    def action():
+        print(f"============ Running XST ============")
+        print(f"> {xst_exe} {common_opts} -ifn {scr_file}")
+        subprocess.run(
+            [str(xst_exe), "-ifn", scr_file],
+            cwd=build_dir,
+            check=True
+        )
+
+
+    return {
+        "actions": [action],
+        "file_dep": [scr_path, prj_path],  # <== beides!
+        "targets": [Path(cfg["REPORT_DIR"]) / f"{project}.SynthesisReport"],
+        "verbosity": 2,
+        "task_dep": ["generate_scr", "generate_prj"],
+    }
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..20c407f
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+toml
+pytest
+doit
diff --git a/tasks/generate_prj.py b/tasks/generate_prj.py
new file mode 100644
index 0000000..9c42734
--- /dev/null
+++ b/tasks/generate_prj.py
@@ -0,0 +1,14 @@
+import os
+from tools.config import get_vhdl_sources_and_tests
+from tools.paths import REL_FROM_WORKING_TO_ROOT as REL_ROOT, ROOT, WORKING
+from pathlib import Path
+
+def generate_prj(prj_path: Path, *_):
+    sources, _ = get_vhdl_sources_and_tests()
+    prj_path.parent.mkdir(parents=True, exist_ok=True)
+
+    with prj_path.open("w", encoding="utf-8") as f:
+        for libname, files in sources.items():
+            for file in files:
+                rel_path = os.path.relpath(ROOT / file, WORKING)
+                f.write(f"vhdl {libname} {rel_path}\n")
diff --git a/tasks/generate_scr.py b/tasks/generate_scr.py
new file mode 100644
index 0000000..46067eb
--- /dev/null
+++ b/tasks/generate_scr.py
@@ -0,0 +1,33 @@
+from tools.config import parse_project_cfg
+from pathlib import Path
+
+
+def generate_scr(scr_path: Path, cfg_path: Path):
+    cfg = parse_project_cfg(cfg_path)
+
+    project = cfg["PROJECT"]
+    top = cfg.get("TOPLEVEL", project)
+    target_part = cfg["TARGET_PART"]
+    xst_opts = cfg.get("XST_OPTS", "")
+
+    # SCR-Datei vollständig in einer Zeile, wie im Makefile
+    scr_parts = [
+        "run",
+        f"-ifn {project}.prj",
+        f"-ofn {project}.ngc",
+        "-ifmt mixed",
+    ]
+
+    # Optional: Optionen aus XST_OPTS hinzufügen
+    if xst_opts.strip():
+        scr_parts += xst_opts.strip().split()
+
+    scr_parts += [
+        f"-top {top}",
+        "-ofmt NGC",
+        f"-p {target_part}",
+    ]
+
+    scr_line = " ".join(scr_parts).replace("\n", " ").replace("\r", " ")
+    scr_path.parent.mkdir(parents=True, exist_ok=True)
+    scr_path.write_text(scr_line, encoding="utf-8")
diff --git a/tasks/run_xst.py b/tasks/run_xst.py
new file mode 100644
index 0000000..a81242e
--- /dev/null
+++ b/tasks/run_xst.py
@@ -0,0 +1,32 @@
+import subprocess
+from tools.paths import WORKING, REPORTS, PROJECT_CFG
+from tools.config import parse_project_cfg
+from tools.defaults import with_defaults
+from pathlib import Path
+
+
+def run_xst():
+    cfg = with_defaults(parse_project_cfg(PROJECT_CFG))
+
+    project = cfg["PROJECT"]
+    scr_file = f"{project}.scr"
+    scr_path = WORKING / scr_file
+    xilinx_path = Path(cfg["XILINX"])
+    xilinx_platform = "lin64"  # TODO: Optional dynamisch machen
+    xst_exe = xilinx_path / "bin" / xilinx_platform / "xst"
+    common_opts = cfg.get("COMMON_OPTS", "")
+
+    if not xst_exe.exists():
+        raise FileNotFoundError(f"xst executable not found at {xst_exe}")
+
+    if not scr_path.exists():
+        raise FileNotFoundError(f"SCR file not found: {scr_path}")
+
+    print(f"\n============ Running XST ============\n")
+    print(f"> {xst_exe} {common_opts} -ifn {scr_file}\n")
+
+    subprocess.run(
+        [str(xst_exe), *common_opts.split(), "-ifn", scr_file],
+        cwd=WORKING,
+        check=True
+    )
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..30645a1
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,72 @@
+from tools.config import parse_vhdl_ls_toml
+from pathlib import Path
+import tempfile
+import textwrap
+import pytest
+
+
+def test_parsing_skips_third_party_libs():
+    content = textwrap.dedent("""
+        [libraries.lib]
+        files = ["src/main.vhd"]
+
+        [libraries.XILINX]
+        files = ["/opt/Xilinx/abc.vhd"]
+        is_third_party = true
+    """)
+    with tempfile.NamedTemporaryFile("w+", suffix=".toml", delete=False) as f:
+        f.write(content)
+        f.flush()
+        result = parse_vhdl_ls_toml(Path(f.name))
+
+    assert "work" in result
+    assert "XILINX" not in result
+    assert result["work"] == [Path("src/main.vhd")]
+
+
+def test_parsing_multiple_libraries():
+    content = textwrap.dedent("""
+        [libraries.lib]
+        files = ["src/foo.vhd", "src/bar.vhd"]
+
+        [libraries.myip]
+        files = ["ipcore/top.vhd"]
+    """)
+    with tempfile.NamedTemporaryFile("w+", suffix=".toml", delete=False) as f:
+        f.write(content)
+        f.flush()
+        result = parse_vhdl_ls_toml(Path(f.name))
+
+    assert "work" in result
+    assert "myip" in result
+    assert result["work"] == [Path("src/foo.vhd"), Path("src/bar.vhd")]
+    assert result["myip"] == [Path("ipcore/top.vhd")]
+
+
+def test_empty_toml_file():
+    with tempfile.NamedTemporaryFile("w+", suffix=".toml", delete=False) as f:
+        f.write("")  # Empty file
+        f.flush()
+        result = parse_vhdl_ls_toml(Path(f.name))
+
+    assert result == {}
+
+
+def test_missing_file_raises_error():
+    with pytest.raises(FileNotFoundError):
+        parse_vhdl_ls_toml(Path("nonexistent.toml"))
+
+
+def test_libname_translation_to_work():
+    content = textwrap.dedent("""
+        [libraries.lib]
+        files = ["src/xyz.vhd"]
+    """)
+    with tempfile.NamedTemporaryFile("w+", suffix=".toml", delete=False) as f:
+        f.write(content)
+        f.flush()
+        result = parse_vhdl_ls_toml(Path(f.name))
+
+    assert "work" in result
+    assert "lib" not in result
+    assert result["work"] == [Path("src/xyz.vhd")]
diff --git a/tests/test_generate_prj.py b/tests/test_generate_prj.py
new file mode 100644
index 0000000..1c93189
--- /dev/null
+++ b/tests/test_generate_prj.py
@@ -0,0 +1,47 @@
+import tempfile
+from pathlib import Path
+from tasks.generate_prj import generate_prj
+
+
+def write_file(path: Path, content: str):
+    path.write_text(content.strip(), encoding="utf-8")
+
+
+def test_generate_prj_single_lib(tmp_path):
+    cfg_path = tmp_path / "project.cfg"
+    toml_path = tmp_path / "vhdl_ls.toml"
+    prj_path = tmp_path / "working" / "MyProject.prj"
+
+    write_file(cfg_path, "PROJECT = MyProject\nTARGET_PART = dummy\nXILINX = /some/path")
+    write_file(toml_path, """
+        [libraries.lib]
+        files = ["src/main.vhd"]
+    """)
+
+    generate_prj(prj_path, cfg_path, toml_path)
+
+    assert prj_path.exists()
+    content = prj_path.read_text()
+    assert "vhdl work ../src/main.vhd" in content
+
+
+def test_generate_prj_multiple_libs(tmp_path):
+    cfg_path = tmp_path / "project.cfg"
+    toml_path = tmp_path / "vhdl_ls.toml"
+    prj_path = tmp_path / "working" / "MyProject.prj"
+
+    write_file(cfg_path, "PROJECT = MyProject\nTARGET_PART = dummy\nXILINX = /some/path")
+    write_file(toml_path, """
+        [libraries.lib]
+        files = ["src/A.vhd", "src/B.vhd"]
+
+        [libraries.otherlib]
+        files = ["src/C.vhd"]
+    """)
+
+    generate_prj(prj_path, cfg_path, toml_path)
+
+    content = prj_path.read_text()
+    assert "vhdl work ../src/A.vhd" in content
+    assert "vhdl work ../src/B.vhd" in content
+    assert "vhdl otherlib ../src/C.vhd" in content
diff --git a/tests/test_generate_scr.py b/tests/test_generate_scr.py
new file mode 100644
index 0000000..d61a1be
--- /dev/null
+++ b/tests/test_generate_scr.py
@@ -0,0 +1,44 @@
+from pathlib import Path
+from tasks.generate_scr import generate_scr
+
+
+def write_file(path: Path, content: str):
+    path.write_text(content.strip(), encoding="utf-8")
+
+
+def test_generate_scr_basic(tmp_path):
+    cfg_path = tmp_path / "project.cfg"
+    scr_path = tmp_path / "working" / "MyProject.scr"
+
+    write_file(cfg_path, """
+        PROJECT = MyProject
+        TARGET_PART = xc3s50-4-pq208
+        XILINX = /some/path
+    """)
+
+    generate_scr(scr_path, cfg_path)
+
+    content = scr_path.read_text()
+    assert "-ifn MyProject.prj" in content
+    assert "-ofn MyProject.ngc" in content
+    assert "-top MyProject" in content
+    assert "-p xc3s50-4-pq208" in content
+
+
+def test_generate_scr_with_top_and_opts(tmp_path):
+    cfg_path = tmp_path / "project.cfg"
+    scr_path = tmp_path / "working" / "MyProject.scr"
+
+    write_file(cfg_path, """
+        PROJECT = MyProject
+        TARGET_PART = xc3s200-5-ft256
+        TOPLEVEL = TopModule
+        XST_OPTS = -opt_mode Speed -opt_level 2
+        XILINX = /some/path
+    """)
+
+    generate_scr(scr_path, cfg_path)
+
+    content = scr_path.read_text()
+    assert "-top TopModule" in content
+    assert "-opt_mode Speed -opt_level 2" in content
diff --git a/tests/test_project_cfg.py b/tests/test_project_cfg.py
new file mode 100644
index 0000000..75836f1
--- /dev/null
+++ b/tests/test_project_cfg.py
@@ -0,0 +1,51 @@
+from build.tools.config import parse_project_cfg
+from pathlib import Path
+import tempfile
+import textwrap
+
+
+def test_parse_complex_project_cfg_correctly():
+    cfg = textwrap.dedent("""
+        ## Main settings.. ##
+        PROJECT = SpriteChannel
+        TARGET_PART = xc3s1200e-4-fg320
+        XILINX = /opt/Xilinx/14.7/ISE_DS/ISE
+        TOPLEVEL = SpriteChannel
+        CONSTRAINTS = src/SpriteChannel.ucf
+
+        # Sources (should be ignored)
+        VHDSOURCE += src/GenericCounter.vhd
+        VSOURCE += src/something.v
+        VHDTEST += test/SpriteChannel_tb.vhd
+
+        # Options
+        XST_OPTS += -opt_mode Speed
+        XST_OPTS += -opt_level 2
+        MAP_OPTS = -detail -timing -ol high
+        PAR_OPTS = -ol high
+        BITGEN_OPTS = -g StartupClk:JtagClk
+
+        # Programmer
+        PROGRAMMER = digilent
+    """)
+
+    with tempfile.NamedTemporaryFile("w+", suffix=".cfg", delete=False) as f:
+        f.write(cfg)
+        f.flush()
+        result = parse_project_cfg(Path(f.name))
+
+    assert result["PROJECT"] == "SpriteChannel"
+    assert result["TARGET_PART"] == "xc3s1200e-4-fg320"
+    assert result["XILINX"] == "/opt/Xilinx/14.7/ISE_DS/ISE"
+    assert result["TOPLEVEL"] == "SpriteChannel"
+    assert result["CONSTRAINTS"] == "src/SpriteChannel.ucf"
+    assert result["XST_OPTS"] == "-opt_mode Speed -opt_level 2"
+    assert result["MAP_OPTS"] == "-detail -timing -ol high"
+    assert result["PAR_OPTS"] == "-ol high"
+    assert result["BITGEN_OPTS"] == "-g StartupClk:JtagClk"
+    assert result["PROGRAMMER"] == "digilent"
+
+    # Sicherstellen, dass SOURCE-Felder ignoriert wurden
+    assert "VHDSOURCE" not in result
+    assert "VSOURCE" not in result
+    assert "VHDTEST" not in result
diff --git a/tools/__init__.py b/tools/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tools/config.py b/tools/config.py
new file mode 100644
index 0000000..95d920b
--- /dev/null
+++ b/tools/config.py
@@ -0,0 +1,88 @@
+from tools.paths import ROOT, PROJECT_CFG, VHDL_LS_TOML
+from pathlib import Path
+from typing import Dict, List, Optional
+import toml
+import re
+from typing import Tuple
+from tools.defaults import with_defaults
+
+def parse_vhdl_ls_toml(toml_path: Optional[Path] = None) -> Dict[str, List[Path]]:
+    if toml_path is None:
+        toml_path = VHDL_LS_TOML
+
+    if not toml_path.exists():
+        raise FileNotFoundError(f"{toml_path} not found.")
+
+    with open(toml_path, "r", encoding="utf-8") as f:
+        raw = toml.load(f)
+
+    libraries = raw.get("libraries", {})
+    parsed: Dict[str, List[Path]] = {}
+
+    for libname, content in libraries.items():
+        if content.get("is_third_party", False):
+            continue
+        files = content.get("files", [])
+        actual_libname = "work" if libname == "lib" else libname
+        parsed[actual_libname] = [Path(f) for f in files]
+
+    return parsed
+
+
+def parse_project_cfg(cfg_path: Optional[Path] = None) -> Dict[str, str]:
+    cfg_path = cfg_path or PROJECT_CFG
+
+    if not cfg_path.exists():
+        raise FileNotFoundError(f"{cfg_path} not found.")
+
+    result: Dict[str, str] = {}
+    ignored_keys = {"VHDSOURCE", "VSOURCE", "VHDTEST", "VTEST"}
+
+    with cfg_path.open("r", encoding="utf-8") as f:
+        for line in f:
+            line = line.strip()
+
+            # Kommentare und Leerzeilen überspringen
+            if not line or line.startswith("#"):
+                continue
+
+            if "+=" in line:
+                key, value = map(str.strip, line.split("+=", 1))
+                if key in ignored_keys:
+                    continue
+                if key in result:
+                    result[key] += f" {value}"
+                else:
+                    result[key] = value
+            elif "=" in line:
+                key, value = map(str.strip, line.split("=", 1))
+                if key in ignored_keys:
+                    continue
+                result[key] = value
+
+    return result
+
+def get_vhdl_sources_and_tests() -> Tuple[Dict[str, List[Path]], Dict[str, List[Path]]]:
+    cfg = with_defaults(parse_project_cfg())
+    test_filter = cfg.get("TEST_FILTER", r"^tests/|_tb\.vhd$")  # Default-Fallback
+
+    try:
+        pattern = re.compile(test_filter)
+    except re.error as e:
+        raise ValueError(f"Invalid TEST_FILTER regex: {e}")
+
+    all_sources = parse_vhdl_ls_toml()
+
+    normal_sources: Dict[str, List[Path]] = {}
+    test_sources: Dict[str, List[Path]] = {}
+
+    for lib, files in all_sources.items():
+        for file in files:
+            # relative Pfade als Strings prüfen
+            rel_path = str(file)
+            if pattern.search(rel_path):
+                test_sources.setdefault(lib, []).append(file)
+            else:
+                normal_sources.setdefault(lib, []).append(file)
+
+    return normal_sources, test_sources
\ No newline at end of file
diff --git a/tools/defaults.py b/tools/defaults.py
new file mode 100644
index 0000000..da65fbc
--- /dev/null
+++ b/tools/defaults.py
@@ -0,0 +1,43 @@
+# tools/defaults.py
+from typing import Dict
+
+def get_default_config() -> Dict[str, str]:
+    return {
+        "TOPLEVEL": "",  # wird dynamisch ersetzt
+        "CONSTRAINTS": "",
+        "BUILD_DIR": "working",
+        "REPORT_DIR": "reports",
+        "COMMON_OPTS": "-intstyle xflow",
+        "XST_OPTS": "",
+        "NGDBUILD_OPTS": "",
+        "MAP_OPTS": "-detail",
+        "PAR_OPTS": "",
+        "BITGEN_OPTS": "",
+        "TRACE_OPTS": "-v 3 -n 3",
+        "FUSE_OPTS": "-incremental",
+        "ISIM_OPTS": "-gui",
+        "ISIM_CMD": "",
+        "PROGRAMMER": "none",
+        "PROGRAMMER_PRE": "",
+        "IMPACT_OPTS": "-batch impact.cmd",
+        "DJTG_EXE": "djtgcfg",
+        "DJTG_DEVICE": "DJTG_DEVICE-NOT-SET",
+        "DJTG_INDEX": "0",
+        "DJTG_FLASH_INDEX": "1",
+        "XC3SPROG_EXE": "xc3sprog",
+        "XC3SPROG_CABLE": "none",
+        "XC3SPROG_OPTS": "",
+    }
+
+def with_defaults(project_cfg: Dict[str, str]) -> Dict[str, str]:
+    merged = get_default_config()
+    merged.update(project_cfg)
+
+    # Fallbacks sicherstellen (kein leerer oder None-Wert bleibt erhalten)
+    if not merged.get("TOPLEVEL"):
+        merged["TOPLEVEL"] = merged.get("PROJECT", "")
+    if not merged.get("CONSTRAINTS"):
+        merged["CONSTRAINTS"] = f"{merged.get('PROJECT', '')}.ucf"
+
+    # Alle Felder final auf gültigen string casten (zur Sicherheit)
+    return {k: (v if isinstance(v, str) else str(v)) for k, v in merged.items()}
diff --git a/tools/paths.py b/tools/paths.py
new file mode 100644
index 0000000..a571964
--- /dev/null
+++ b/tools/paths.py
@@ -0,0 +1,21 @@
+import os
+from pathlib import Path
+import sys
+
+# Ermittle absoluten Pfad dieser Datei
+HERE = Path(__file__).resolve()
+
+# Gehe zurück von tools/ → build/ → Projekt-Root
+ROOT = HERE.parent.parent.parent
+
+# Abgeleitete Pfade
+BUILD = ROOT / "build"
+WORKING = BUILD / "working"
+REPORTS = BUILD / "reports"
+
+# Relativer Pfad von WORKING zurück zur Projektwurzel
+REL_FROM_WORKING_TO_ROOT = Path(os.path.relpath(ROOT, WORKING))
+
+# Standard-Konfigurationsdateien
+PROJECT_CFG = ROOT / "project.cfg"
+VHDL_LS_TOML = ROOT / "vhdl_ls.toml"