tmc: Add `overvoltage_threshold` and `overtemperature_warning_threshold` for TMC2240

[yunline]

This PR adds overvoltage_threshold and overtemperature_warning_threshold to the config of tmc2240 driver.

overvoltage_threshold

Accroding to tmc2240 datasheet:

A stepper motor application can generate significant overvoltage, especially when the motor becomes quickly decelerated from a high velocity, or when the motor stalls To protect the driver as well as connected circuitry, the TMC2240 has an overvoltage detection and protection mechanism. The OV output allows attaching an NPN or MOSFET with a power resistor (brake resistor) to dump the excess energy into the resistor. The transistor chops with approximately 3kHz to 4kHz (depending on the clock frequency) to keep the supply within the limits.

By setting the overvoltage_threshold in config, we can determine the the threshold of the overvoltage detection of tmc2240 to adapt different supply voltage.

overtemperature_warning_threshold

This config sets the threshold of overtemperature warning. When the temperature of tmc2240 reaches this threshold, a overtemperature warning will be reported.

Example config

[tmc2240 stepper_x]
...
overvoltage_threshold: 13.0 
# 13V overvoltage threshold for a 12V system.

overtemperature_warning_threshold: 100
# When temperature reaches 100℃, a warning will be reported.
...

[JamesH1978]

Thank you for submitting a PR, please provide a signed off by line as outlined in https://github.com/Klipper3d/klipper/blob/master/docs/CONTRIBUTING.md

Thanks

James

[yunline]

Thank you for submitting a PR, please provide a signed off by line as outlined in https://github.com/Klipper3d/klipper/blob/master/docs/CONTRIBUTING.md

Updated

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[yunline]

I didn't find a significant quality improvement with overvoltage_threshold set to 13v (my power supply is 12v) or 30v. That could because the printer is running at a low speed (200mm/s 10000mm/s^2), or because the design of circuit of the driver module is not good. Or maybe, changing overvoltage_threshold doesn't really matter to the print quality?

Anyway, before this PR, there is no way to access field overtempprewarning_vth and overvoltage_vth. This is the importances of this PR.