Initial support for RP2040

builder/frameworks/_bare.py

@@ -0,0 +1,66 @@
+# Copyright 2014-present PlatformIO <contact@platformio.org>
+#
+# 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.
+
+#
+# Default flags for bare-metal programming (without any framework layers)
+#
+
+from SCons.Script import DefaultEnvironment
+
+env = DefaultEnvironment()
+
+env.Append(
+    ASFLAGS=["-x", "assembler-with-cpp"],
+
+    CCFLAGS=[
+        "-Os",  # optimize for size
+        "-ffunction-sections",  # place each function in its own section
+        "-fdata-sections",
+        "-Wall",
+        "-mthumb",
+        "-nostdlib"
+    ],
+
+    CXXFLAGS=[
+        "-fno-rtti",
+        "-fno-exceptions"
+    ],
+
+    CPPDEFINES=[
+        ("F_CPU", "$BOARD_F_CPU")
+    ],
+
+    LINKFLAGS=[
+        "-Os",
+        "-Wl,--gc-sections,--relax",
+        "-mthumb",
+        "--specs=nano.specs",
+        "--specs=nosys.specs"
+    ],
+
+    LIBS=["c", "gcc", "m", "stdc++", "nosys"]
+)
+
+if "BOARD" in env:
+    env.Append(
+        CCFLAGS=[
+            "-mcpu=%s" % env.BoardConfig().get("build.cpu")
+        ],
+        LINKFLAGS=[
+            "-mcpu=%s" % env.BoardConfig().get("build.cpu")
+        ]
+    )
+
+# copy CCFLAGS to ASFLAGS (-x assembler-with-cpp mode)
+env.Append(ASFLAGS=env.get("CCFLAGS", [])[:])