there's typo in SoftwareSerialM/HAL_softserial_STM32F1.cpp
#include "HAL_softSerial_STM32F1.h"
'Serial' should be changed to 'serial'
gouache does this affect compiling the firmware or the printer when printing?
trashman this bug makes build break for compiling cheetah.
What is this SoftwareSerialM good for?