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teemuatlut / TMCStepper

MIT License
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2130 stallguard questions #84

Open i-make-robots opened 5 years ago

i-make-robots commented 5 years ago

Hi! Thanks for your great work on these libraries.

I'm extra slow today. I have TMCStepper library working with the StallGuard demo on a Mega2560 and Ramps 1.4 I'm using hardware SPI and CS pins 53/49 for two motors. I've added a wire to listen to diag1 on pin 42/44. Regardless of motor speed or STALL_VALUE I don't get a stall warning or lost_steps > 0. Any idea what I'm missing? sketch_oct21a.ino.txt

teemuatlut commented 5 years ago

The stall status isn't automatically directed to a diag output. You need to use the diag0_stall or diag1_stall methods to enable that. See p25 GCONF and p72 DIAG Outputs for more information.

i-make-robots commented 5 years ago

I guess I'm not understanding how to set the rms_current correctly. the equation on p56 makes my eyes crossed. i have a nema17 with peak 300mA. how would I get the right rms_current? rn i'm just guessing numbers and that's going to cause an accident.

teemuatlut commented 5 years ago

rms_current handles the calculation automatically so you don't need to worry about the equation.

i-make-robots commented 5 years ago

so i don't need to call rms_current? I tried 300/1.4 (~214) and up to 250, it generates many false positives. I tried 300 up to 300*1.4 and it never drops to zero. At each value I tried a variety of STALL_VALUEs. I'm sorry I'm so slow to grok this.

cstevens-mettest commented 5 years ago

I'm also having a similar issue. I'm currently trying to use a TMC 2130 to drive a stepper motor on an MKS Gen L board. I plan on using the TMCStepper library with the AccelStepper library to create a closed loop system that can account for lost steps. Do I need to use diag1_stall or can I use diag1_steps_skipped() to find the amount of steps skipped? How do I ensure that I'm listening to Diag1 (Pin 6)? I've attached my modified stallguard example below. StallGuardTest.txt