Just #undef USEUSB in grbl.h after #ifdef STM32F103C8 or delete "USEUSB" in project properties -> C/C++ General -> Path and Symbols -> Symbols. If you want to use UART and more then 4 axis, you can ...
This code is free to use at your own discretion. I have struggled with MAX31855 and MAX6675 to work with raspberry pi zero 2w Make sure you turn on SPI in config. I moved my MAX6675 to SPI1 because I ...
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