Now I am browsing other forums to see how other guys a playing with TMC2130. I found many questions have no reply. Here is an example: stackoverflow.com/questions/67856624/….

The question is to set the stepper motor's speed, which is proportional to the step rate.I guess I might try this using my TMC2130 testing rig.

Other tm2130 hobbyists seem not quite understand the relationship between step rate and motor speed, so I am thinking of using a square wave signal generator to explain how we can dreive the motor speed from step rate.

For the standalone mode testing I am doing now, I will be using a sig gen to send the step signals to the tmc2130 driver. In other words, no Pico software now. It is the next step I will be using Pico generated stop pulses to replace the external, manually adjusted frequency sig gen.

Reference of the step/sig gen:

I forgot to mention that this cheapy PWM sig gen is only US$2.

Now I am staring at the tmc2130, and thinking of how to select:

(a) manual hardware pin config mode, or

(b) software UART config mode.

@john Ha, it is only now that I have a chance to look at the real thing then I understand why you said why you could not find the "SPI jumper". The reason is that the photo we are looking at does not match the real thing we are looking at. I need to find if it is a version difference.

The tmc2310 I just received is version 1.1. What is your version?

Ah, locking down afternoon tea time. See you later.

I used a multimeter to verify that the SPI jumper is actually sort of "SPI Enalbe/Disable" jumper. If this jumper shorted by the SMD 002 resistor, or just a solder blob, then the TMC23010's SPI pin is shorted to ground, thus disabling the SPI function.

@john So if your board's SPI jumper is open, it means SPI signal is disabled. To set SPI mode, you need to remove the resistor/solder blob.

Now my board's SPI jumper is shorted, so I can now ready do standalone mode of configuration, using the config pins CFG/MF pins, but still need to use the Step/Dir pins to move and set direction of the motor. Later if I wish to do SPI configuation, I would remove the 0 Ohm resistor (SMD marked 0 or 002) or the solder blob.

So I am wiring the tmc2130, but found a big problem. As uploaded above the pinout on the power/coil side is like this:

VM, GND, 2B, 1B, 1A, 1A, Vcc, GND

What should I do now?

Bed time anyway, so I should go to bed. :)