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teemuatlut / TMC2130Stepper

Arduino library for Trinamic TMC2130 Stepper driver
MIT License
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TMC write is OK, but read doesn't work. the data always be 1111111111111111 or 0xFFFFFF #74

Closed ziyangwang007 closed 5 years ago

ziyangwang007 commented 5 years ago

Hi!

Thanks for creating this excellent and detailed library for TMC2130.

It saves lots of time for us.

I only have one problem when I use this library, my code or test other people's code.

For me, write and sending data works well, I can easily test and control my motor, but when I try to read the data and status from the register by SPI.

The results always be 11111111111111111111111111111111 or 0xFFFFFFFF(it is same). and 8 bit SPI Status always be 0.

Do you have any ideas?

does it means some registers should be configured? or some other problems need be fixed?

Thanks!

teemuatlut commented 5 years ago

It's quite possible for the MISO line to have issues while MOSI works just fine. It's a bit broad advice but check the wiring, grimps and soldering. Also make sure the driver has VMOT power from the start.

ziyangwang007 commented 5 years ago

I appreciate your quick and professional reply!

Yes, I connect the SilentStepStick and Arduino Mega board with new wires and breadboard. It works now. I can read and write data to the registers.

In further, I realized when I use "Serial.print" function to read status, the motor may stop working for print. After the end of print, the motor start to work again.

And also, the status and data I read from motor never change. For example, DRVSTATUS always be 111000101000000001010000000000, even when I put mechanical load.

Do you have any idea for that? thank you again for your time!

teemuatlut commented 5 years ago

Move the step pin write calls to an interrupt routine so that the stepping takes priority over the rest of the program. When normally running a motor at a constant speed (driver doesn't go into hold current), the only value that is likely to change is SG_RESULT. However, this only applies when using spreadCycle and also needs tuning to get a sensible value.