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Communication Problem with TMC2130

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fethiyeli

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Hello Everybody,

I am using TMC2130 stepper motor driver to use with my 3D printer. I'm trying to communicate over SPI but it does not work SOMETIMES. :bang: MOSI,MISO and Clock lines are working correctly but CS pin is hanging around 1V. MCU CS pin is connected via 100ohm to driver. MCU side working correctly. I checked the soldering and there is no problem. Does anyone have any suggestion ? My MCU is STM32F103 btw. Thanks for your helps !
 

CS (CSN) is an input in all modes of operation so to be driving a voltage out and 'fighting' the CPU there is either a short on your wiring or something is causing a latch-up situation. Does the MCU and TMC2130 share the same supply? Is it possible the MCU is powered up before the TMC2130 and it's input protection is latching?

Brian.
 

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