tmc2240: add current formatters

[kdomanski]

Run current, hold current and current range will be shown in Amperes. Each 2240 driver now has a separate instance of FieldFormatters, since the current formatters need to access a few fields in order to calculate the current.

Output sample:

  // DRV_CONF: 00000001 current_range=1 (1.41A RMS)
  // GLOBALSCALER: 0000007f globalscaler=127
  // IHOLD_IRUN: 04061f1f ihold=31 (0.70A RMS) irun=31 (0.70A RMS) iholddelay=6 irundelay=4

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[kdomanski]

Self-review checklist

1. Is the submission free of defects and is it ready to be widely deployed?

• Yes, the submission passes regression tests
• it has been tested manually as well
• it doesn't add any logging or debugging code

2. Does the submission provide a "high impact" benefit to real-world users performing real-world tasks?

Yes, it prevents the necessity to manually calculate current values when debugging the behavior of TMC2240 drivers.

3. Is the copyright of the submission clear, non-gratuitous, and compatible?

Yes.

4. Does the submission follow guidelines specified in the Klipper documentation?

Yes.

5. Is the Klipper documentation updated to reflect new changes?

The completeness of field formatters is not documented nor does it need to be. Thus adding a few formatters requires no documentation change.

6. Are commits well formed, address a single topic per commit, and independent?

Yes.

[KevinOConnor]

Thanks. I'm not sure about this change, as there isn't a simple mapping between ihold/irun and amps. I fear it could be confusing to users that a dump of the IHOLD_IRUN register reports different descriptions for the same register content. It also makes the tmc2240 dump output different from all the other tmc drivers. A user can obtain the power settings via running the SET_TMC_CURRENT command (without arguments).

-Kevin

[KevinOConnor]

For what it is worth, perhaps an alternative would be for DUMP_TMC to report the power settings (as SET_TMC_CURRENT already does). Or perhaps the documentation could make it more clear that the information is available from SET_TMC_CURRENT.

Cheers,
-Kevin

[kdomanski]

Hey Kevin,
it definitely was a mistake on my part to miss def get_current(self) which was right there. -,-'
I'm happy to rework and simplify this, if you'd like.

I fear it could be confusing to users that a dump of the IHOLD_IRUN register reports different descriptions for the same register content.

By "different descriptions", do you mean both peak-to-peak and RMS? I can remove the first one, if you'd like.

It also makes the tmc2240 dump output different from all the other tmc drivers.

Is that really an issue? The output is already different, because drivers are all different and have different registers.
I know that you mean the specific part regarding current, however it sounds a bit like "either we implement this for all TMC drivers or none of them". Is that the idea? If so, I might need someone to collaborate with on this one, because I simply don't own every TMC driver supported. Right now, I could extend this to TMC2209, which I also have.

Or perhaps the documentation could make it more clear that the information is available from SET_TMC_CURRENT.

That would definitely help, however I cannot find a good spot to do it. I'm afraid that simply adding it in the reference docs for the SET_TMC_CURRENT command will not result in more people reading it and being aware. Maybe you or @Arksine have a better idea though.

[KevinOConnor]

By "different descriptions", do you mean both peak-to-peak and RMS?

I mean, for example, that the IRUN field may have a value of 5, but that may translate to a description of 0.6amp, 1amp, 2amp, etc. That is, it may be confusing to describe the IRUN field using settings that are external to the IRUN field.

-Kevin

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