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