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Make F_CPU a compile-time constant (#21051)

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This commit is contained in:
X-Ryl669
2021-02-27 00:59:28 +01:00
committed by GitHub
parent f384f81253
commit 56462cf082
3 changed files with 25 additions and 0 deletions
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13
buildroot/share/PlatformIO/scripts/common-cxxflags.py
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@ -11,6 +11,13 @@ env.Append(CXXFLAGS=[
#"-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 separe release and debug build folders.
@ -20,3 +27,9 @@ env.Append(CXXFLAGS=[
#
if env.GetBuildType() == "debug":
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()