PlatformIO support

package.json

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+{
+    "description": "Arduino Core for CH32V003 RISC-V microcontroller",
+    "name": "framework-arduinoch32v003",
+    "system": "all",
+    "url": "https://github.com/AlexanderMandera/arduino-wch32v003",
+    "version": "0.0.0"
+}

tools/platformio-build.py

@@ -0,0 +1,150 @@
+# Copyright 2023-present Maximilian Gerhardt <[email protected]>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Arduino
+
+Arduino Wiring-based Framework allows writing cross-platform software to
+control devices attached to a wide range of Arduino boards to create all
+kinds of creative coding, interactive objects, spaces or physical experiences.
+
+http://arduino.cc/en/Reference/HomePage
+"""
+
+from os.path import isdir, join
+
+from SCons.Script import DefaultEnvironment
+
+env = DefaultEnvironment()
+platform = env.PioPlatform()
+board = env.BoardConfig()
+
+FRAMEWORK_DIR = platform.get_package_dir("framework-arduinoch32v003")
+assert isdir(FRAMEWORK_DIR)
+
+machine_flags = [
+    "-march=%s" % board.get("build.march"),
+    "-mabi=%s" % board.get("build.mabi"),
+]
+
+# the compiler we're using in PlatformIO does not have "-misa-spec=2.2", so it's not included.
+
+env.Append(
+    ASFLAGS=machine_flags,
+    ASPPFLAGS=[
+        "-x", "assembler-with-cpp"
+    ],
+
+    CFLAGS=[
+        "-std=gnu11"
+    ],
+
+    CCFLAGS=machine_flags + [
+        "-Os",
+        "-Wall",
+        "-ffunction-sections",
+        "-fdata-sections",
+        #"-flto",
+        #"-ffat-lto-objects",
+        #"-fuse-linker-plugin",
+        "-static-libgcc",
+    ],
+
+    CXXFLAGS=[
+        "-fno-exceptions",
+        "-fno-rtti",
+        "-fpermissive",
+        "-std=gnu++17"
+    ],
+
+    LINKFLAGS=machine_flags + [
+        "-Os",
+        "-Wl,--gc-sections",
+        #"-flto",
+        #"-fuse-linker-plugin",
+        "-nostdlib",
+        #"-fwhole-program",
+        '-Wl,-Map="%s"' % join("${BUILD_DIR}", "${PROGNAME}.map")
+    ],
+    # no actual GCC preprocessing needed since no macros are used
+    LDSCRIPT_PATH=join(FRAMEWORK_DIR, "ch32v003fun", "ch32v003fun", "ch32v003fun.ld"),
+
+    CPPDEFINES= [
+        "TINYVECTOR",
+        "CPLUSPLUS",
+        "ARDUINO_ARCH_WCH",
+        ("ARDUINO", 10808)
+    ],
+
+    LIBS=[
+        #File(join(FRAMEWORK_DIR, "misc", "libgcc.a"))
+        "gcc"
+    ],
+
+    LIBSOURCE_DIRS=[
+        join(FRAMEWORK_DIR, "libraries")
+    ],
+
+    CPPPATH=[
+        join(FRAMEWORK_DIR, "cores", "arduino"),
+        # we excplicitly cannot include the API folder here because "String.h" (Arduino)
+        # conflicts with "string.h" (GCC toolchain standard header) on case-insensitive
+        # filesystems (Windows)
+        #join(FRAMEWORK_DIR, "cores", "arduino", "api"),
+        join(FRAMEWORK_DIR, "cores", "arduino", "api", "deprecated"),
+        join(FRAMEWORK_DIR, "cores", "arduino", "api", "deprecated-avr-comp"),
+        join(FRAMEWORK_DIR, "ch32v003fun", "ch32v003fun"),
+        join(FRAMEWORK_DIR, "cores", "arduino", "hal"),
+    ]
+)
+
+#
+# Target: Build Core Library
+#
+
+libs = []
+
+if "build.variant" in board:
+    variants_dir = join(
+        "$PROJECT_DIR", board.get("build.variants_dir")) if board.get(
+            "build.variants_dir", "") else join(FRAMEWORK_DIR, "variants")
+
+    env.Append(
+        CPPPATH=[
+            join(variants_dir, board.get("build.variant"))
+        ]
+    )
+    env.BuildSources(
+        join("$BUILD_DIR", "FrameworkArduinoVariant"),
+        join(variants_dir, board.get("build.variant"))
+    )
+
+# We have build this as sources and not as library
+# to get linking to work properly (??? not sure why yet)
+env.BuildSources(
+    join("$BUILD_DIR", "FrameworkArduino"),
+    join(FRAMEWORK_DIR, "cores", "arduino"),
+    # Hack: including IPAddress.cpp in the build, although unused,
+    # blows up firmware size. Neither gc-sections nor LTO can
+    # get rid of this :(
+    "+<*> -<api/IPAddress.cpp>"
+)
+# The "Released" package copies these files into core/arduino, but we use git version
+# so we have to build those manually.
+env.BuildSources(
+    join("$BUILD_DIR", "ch32v003fun"),
+    join(FRAMEWORK_DIR, "ch32v003fun", "ch32v003fun"),
+)
+
+env.Prepend(LIBS=libs)