first commit

buildroot/share/PlatformIO/scripts/common-cxxflags.py

@@ -0,0 +1,34 @@
+#
+# common-cxxflags.py
+# Convenience script to apply customizations to CPP flags
+#
+Import("env")
+env.Append(CXXFLAGS=[
+  "-Wno-register"
+  #"-Wno-incompatible-pointer-types",
+  #"-Wno-unused-const-variable",
+  #"-Wno-maybe-uninitialized",
+  #"-Wno-sign-compare"
+])
+
+#
+# Add CPU frequency as a compile time constant instead of a runtime variable
+#
+def add_cpu_freq():
+	if 'BOARD_F_CPU' in env:
+		env['BUILD_FLAGS'].append('-DBOARD_F_CPU=' + env['BOARD_F_CPU'])
+
+# Useful for JTAG debugging
+#
+# It will separate release and debug build folders.
+# It useful to keep two live versions: a debug version for debugging and another for
+# release, for flashing when upload is not done automatically by jlink/stlink.
+# Without this, PIO needs to recompile everything twice for any small change.
+if env.GetBuildType() == "debug" and env.get('UPLOAD_PROTOCOL') not in ['jlink', 'stlink']:
+	env['BUILD_DIR'] = '$PROJECT_BUILD_DIR/$PIOENV/debug'
+
+# On some platform, F_CPU is a runtime variable. Since it's used to convert from ns
+# to CPU cycles, this adds overhead preventing small delay (in the order of less than
+# 30 cycles) to be generated correctly. By using a compile time constant instead
+# the compiler will perform the computation and this overhead will be avoided
+add_cpu_freq()