Marlin 2.0 for Flying Bear 4S/5
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#
# stm32_serialbuffer.py
#
import pioutil
if pioutil.is_pio_build():
Import("env")
# Get a build flag's value or None
def getBuildFlagValue(name):
for flag in build_flags:
if isinstance(flag, list) and flag[0] == name:
return flag[1]
return None
# Get an overriding buffer size for RX or TX from the build flags
def getInternalSize(side):
return getBuildFlagValue(f"MF_{side}_BUFFER_SIZE") or \
getBuildFlagValue(f"SERIAL_{side}_BUFFER_SIZE") or \
getBuildFlagValue(f"USART_{side}_BUF_SIZE")
# Get the largest defined buffer size for RX or TX
def getBufferSize(side, default):
# Get a build flag value or fall back to the given default
internal = int(getInternalSize(side) or default)
flag = side + "_BUFFER_SIZE"
# Return the largest value
return max(int(mf[flag]), internal) if flag in mf else internal
# Add a build flag if it's not already defined
def tryAddFlag(name, value):
if getBuildFlagValue(name) is None:
env.Append(BUILD_FLAGS=[f"-D{name}={value}"])
# Marlin uses the `RX_BUFFER_SIZE` \ `TX_BUFFER_SIZE` options to
# configure buffer sizes for receiving \ transmitting serial data.
# Stm32duino uses another set of defines for the same purpose, so this
# script gets the values from the configuration and uses them to define
# `SERIAL_RX_BUFFER_SIZE` and `SERIAL_TX_BUFFER_SIZE` as global build
# flags so they are available for use by the platform.
#
# The script will set the value as the default one (64 bytes)
# or the user-configured one, whichever is higher.
#
# Marlin's default buffer sizes are 128 for RX and 32 for TX.
# The highest value is taken (128/64).
#
# If MF_*_BUFFER_SIZE, SERIAL_*_BUFFER_SIZE, USART_*_BUF_SIZE, are
# defined, the first of these values will be used as the minimum.
build_flags = env.ParseFlags(env.get('BUILD_FLAGS'))["CPPDEFINES"]
mf = env["MARLIN_FEATURES"]
# Get the largest defined buffer sizes for RX or TX, using defaults for undefined
rxBuf = getBufferSize("RX", 128)
txBuf = getBufferSize("TX", 64)
# Provide serial buffer sizes to the stm32duino platform
tryAddFlag("SERIAL_RX_BUFFER_SIZE", rxBuf)
tryAddFlag("SERIAL_TX_BUFFER_SIZE", txBuf)
tryAddFlag("USART_RX_BUF_SIZE", rxBuf)
tryAddFlag("USART_TX_BUF_SIZE", txBuf)