Fix STM32 flush of TX (used by UBL) (#16197)
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@ -75,7 +75,7 @@ extern uint8_t marlin_debug_flags;
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#define SERIAL_PRINTF(V...) SERIAL_OUT(printf, V)
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#define SERIAL_PRINTF(V...) SERIAL_OUT(printf, V)
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#define SERIAL_FLUSH() SERIAL_OUT(flush)
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#define SERIAL_FLUSH() SERIAL_OUT(flush)
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#ifdef __STM32F1__
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#ifdef ARDUINO_ARCH_STM32
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#define SERIAL_FLUSHTX() SERIAL_OUT(flush)
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#define SERIAL_FLUSHTX() SERIAL_OUT(flush)
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#elif TX_BUFFER_SIZE > 0
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#elif TX_BUFFER_SIZE > 0
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#define SERIAL_FLUSHTX() SERIAL_OUT(flushTX)
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#define SERIAL_FLUSHTX() SERIAL_OUT(flushTX)
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