Possible bug. Stallguard not functioning without pwm_autoscale on tmc2209

[wakass]

Stallguard does not function properly (or as expected?) on a 2209 driver. The following line is relevant, and setting autoscale to true recovers proper stallguard behaviour on my system:

Trinamic-library/tmc2209hal.c

Line 162 in 9eae92b

driver->pwmconf.reg.pwm_autoscale = false;

I'm not sure how this works in other driver modules, but I can't find any reference on stallguard requiring disabling pwm_autoscaling. Just tcoolthrs < tstep < tpwmthres

[troth530]

@wakass I tend to agree, in fact it seems the drivers will operate in open loop with velocity based current scaling (requiring motor specific settings) with pwm_autoscale set to false. In this context the motors will stall during jogging regardless of stallguard threshold. On the other hand when pwm_autoscale is set to true stalling is only occurring during homing with reasonable stallguard threshold settings that work with my motors.

[philletourneau]

👀 I've been trying to get stallguard working for days! I'll give this a try too.

Otherwise I'm having trouble with are setting the tCoolThrs and TPWMThrs to any value other than 0, and the driver status is always reporting stealth as 0 (meaning spreadcycle and not stealthchop)

[WheeSci]

It looks like this boolean is set to true in the version of grblHAL I downloaded in Dec 2024. Thanks!

[troth530]

It looks like this boolean is set to true in the version of grblHAL I downloaded in Dec 2024. Thanks!

It was fixed a year ago.