svd: add a CLI with utility scripts

Add a CLI intended for various utility scripts.
For now there is a single command that can be used to generate
register content descriptions.

Signed-off-by: Jonathan Nilsen <[email protected]>

pyproject.toml

@@ -17,6 +17,10 @@ dependencies = [
   "numpy~=2.1",
   "typing_extensions>=4.4.0",
 ]
+optional-dependencies = { cli = ["intelhex", "tomlkit"] }
+
+[project.scripts]
+svada = "svd.__main__:cli"
 
 [project.urls]
 homepage = "https://github.com/nordicsemiconductor/svada"

src/svd/__main__.py

@@ -0,0 +1,295 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+from __future__ import annotations
+
+import argparse
+import dataclasses
+import enum
+import importlib.util
+import json
+import sys
+from pathlib import Path
+from textwrap import dedent
+
+import svd
+from svd.util import BuildSelector, DeviceBuilder
+
+_HAS_INTELHEX = importlib.util.find_spec("intelhex") is not None
+_HAS_TOMLKIT = importlib.util.find_spec("tomlkit") is not None
+
+
+class Format(enum.Enum):
+    JSON = enum.auto()
+    BIN = enum.auto()
+    IHEX = enum.auto()
+    TOML = enum.auto()
+
+
+def cli() -> None:
+    top = argparse.ArgumentParser(
+        description=dedent(
+            """\
+            Collection of utility scripts for working with System View Description (SVD) files.
+
+            Use the --help option with each command to see more information about
+            them and their individual options/arguments.
+            """
+        ),
+        allow_abbrev=False,
+        add_help=False,  # To override -h
+    )
+    _add_help_option(top)
+
+    sub = top.add_subparsers(title="subcommands")
+
+    gen = sub.add_parser(
+        "content-gen",
+        help="Encode and decode device content to and from various formats.",
+        description=dedent(
+            """\
+            Encode device content from one of the supported formats and output it to another
+            supported format.
+            """
+        ),
+        allow_abbrev=False,
+        add_help=False,
+    )
+    gen.set_defaults(_command="content-gen")
+    _add_help_option(gen)
+
+    gen_in = gen.add_argument_group("input options")
+    gen_in_mutex = gen_in.add_mutually_exclusive_group(required=True)
+    gen_in_mutex.add_argument(
+        "-j", "--in-json", action="store_true", help="Input is in JSON format."
+    )
+    if _HAS_INTELHEX:
+        gen_in_mutex.add_argument(
+            "-h",
+            "--in-hex",
+            action="store_true",
+            help="Input is in Intel HEX format.",
+        )
+    if _HAS_TOMLKIT:
+        gen_in_mutex.add_argument(
+            "-t",
+            "--in-toml",
+            action="store_true",
+            help="Input is in TOML format.",
+        )
+    gen_in.add_argument(
+        "-i",
+        "--input-file",
+        type=Path,
+        help="File to read the input from. If not given, stdin is used.",
+    )
+
+    gen_svd = gen.add_argument_group("SVD options")
+    gen_svd.add_argument(
+        "-s",
+        "--svd-file",
+        required=True,
+        type=Path,
+        help="Path to the device SVD file.",
+    )
+    gen_svd.add_argument(
+        "-n",
+        "--no-strict",
+        action="store_true",
+        help="Don't enforce constraints on register and field values based on the SVD file.",
+    )
+    gen_svd.add_argument(
+        "--svd-parse-options",
+        type=json.loads,
+        help=(
+            "JSON object used to override fields in the Options object to customize svada parsing "
+            "behavior. Mainly intended for advanced use cases such as working around "
+            "difficult SVD files. "
+        ),
+    )
+
+    gen_sel = gen.add_argument_group("selection options")
+    gen_sel.add_argument(
+        "-p",
+        "--peripheral",
+        metavar="NAME",
+        dest="peripherals",
+        action="append",
+        help="Limit output content to the given peripheral. May be given multiple times.",
+    )
+    gen_sel.add_argument(
+        "-a",
+        "--address-range",
+        metavar=("START", "END"),
+        nargs=2,
+        type=_parse_address_range,
+        help="Limit output to a specific address range. Addresses can be given as hex or decimal.",
+    )
+    gen_sel.add_argument(
+        "-c",
+        "--content-status",
+        choices=[c.value for c in BuildSelector.ContentStatus.__members__.values()],
+        help="Limit output based on the status of the register content.",
+    )
+
+    gen_out = gen.add_argument_group("output options")
+    gen_out_mutex = gen_out.add_mutually_exclusive_group(required=True)
+    gen_out_mutex.add_argument(
+        "-J",
+        "--out-json",
+        action="store_true",
+        help="Output in JSON format.",
+    )
+    gen_out_mutex.add_argument(
+        "-B",
+        "--out-bin",
+        action="store_true",
+        help="Output in binary format.",
+    )
+    if _HAS_INTELHEX:
+        gen_out_mutex.add_argument(
+            "-H",
+            "--out-hex",
+            action="store_true",
+            help="Output in Intel HEX format.",
+        )
+    if _HAS_TOMLKIT:
+        gen_out_mutex.add_argument(
+            "-T",
+            "--out-toml",
+            action="store_true",
+            help="Output in TOML format.",
+        )
+    gen_out.add_argument(
+        "-o",
+        "--output-file",
+        type=Path,
+        help="File to write the output to. If not given, output is written to stdout.",
+    )
+
+    args = top.parse_args()
+    if not hasattr(args, "_command"):
+        top.print_usage()
+        sys.exit(2)
+
+    if args._command == "content-gen":
+        cmd_content_gen(args)
+    else:
+        top.print_usage()
+        sys.exit(2)
+
+    sys.exit(0)
+
+
+def cmd_content_gen(args: argparse.Namespace) -> None:
+    input_format = None
+    input_mode = None
+    if args.in_json:
+        input_format = Format.JSON
+        input_mode = "rb"
+    elif _HAS_INTELHEX and getattr(args, "in_hex", False):
+        input_format = Format.IHEX
+        input_mode = "r"
+    elif _HAS_TOMLKIT and getattr(args, "in_toml", False):
+        input_format = Format.TOML
+        input_mode = "rb"
+
+    assert input_format is not None
+    assert input_mode is not None
+
+    if args.input_file:
+        # TODO: encoding
+        input_file = open(args.input_file, input_mode)
+    else:
+        input_file = sys.stdin.buffer if "b" in input_mode else sys.stdin
+
+    options = svd.Options(
+        parent_relative_cluster_address=True,
+    )
+    if args.svd_parse_options:
+        options = dataclasses.replace(options, **args.svd_parse_options)
+
+    device = svd.parse(args.svd_file, options=options)
+    device_builder = DeviceBuilder(device, enforce_svd_constraints=not args.no_strict)
+
+    if input_format == Format.JSON:
+        input_dict = json.load(input_file)
+        device_builder.apply_dict(input_dict)
+    elif input_format == Format.IHEX:
+        from intelhex import IntelHex
+
+        ihex = IntelHex(input_file)
+        ihex_memory = {a: ihex[a] for a in ihex.addresses()}
+        device_builder.apply_memory(ihex_memory)
+    elif input_format == Format.TOML:
+        import tomlkit
+
+        input_dict = tomlkit.load(input_file)
+        device_builder.apply_dict(input_dict)
+
+    selector = BuildSelector(
+        peripherals=args.peripherals if args.peripherals else None,
+        address_range=args.address_range if args.address_range is not None else None,
+        content_status=(
+            BuildSelector.ContentStatus[args.content_status]
+            if args.content_status
+            else BuildSelector.ContentStatus.ANY
+        ),
+    )
+
+    output_format = None
+    output_mode = None
+    if args.out_json:
+        output_format = Format.JSON
+        output_mode = "w"
+    if args.out_bin:
+        output_format = Format.BIN
+        output_mode = "wb"
+    elif _HAS_INTELHEX and getattr(args, "out_hex", False):
+        output_format = Format.IHEX
+        output_mode = "w"
+    elif _HAS_TOMLKIT and getattr(args, "out_toml", False):
+        output_format = Format.TOML
+        output_mode = "w"
+
+    assert output_format is not None
+    assert output_mode is not None
+
+    if args.output_file:
+        output_file = open(args.output_file, output_mode, encoding="utf-8")
+    else:
+        output_file = sys.stdout.buffer if "b" in output_mode else sys.stdout
+
+    if output_format == Format.JSON:
+        output_dict = device_builder.build_dict(selector)
+        json.dump(output_dict, output_file)
+    elif output_format == Format.BIN:
+        output_bin = device_builder.build_bytes(selector)
+        output_file.write(output_bin)
+    elif output_format == Format.IHEX:
+        from intelhex import IntelHex
+
+        output_ihex = IntelHex(device_builder.build_memory(selector))
+        output_ihex.write_hex_file(output_file)
+    elif output_format == Format.TOML:
+        import tomlkit
+
+        output_dict = device_builder.build_dict(selector)
+        tomlkit.dump(output_dict, output_file)
+
+
+def _add_help_option(parser: argparse.ArgumentParser) -> None:
+    parser.add_argument("--help", action="help", help="Print help message")
+
+
+def _parse_address_range(addr_range: str) -> tuple[int, int]:
+    start, end = [int(a.strip(), 0) for a in addr_range.split()]
+    return start, end
+
+
+# Entry point when running with python -m svd
+if __name__ == "__main__":
+    cli()