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docs: Update TMC_Drivers.md with note on SPI failures on TMC driver checks 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2021-03-16 14:41:58 -04:00
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@ -303,6 +303,15 @@ mid-print. This may be due to voltage or wiring issues.
driver has detected a low-voltage event and has disabled itself. This
may be due to wiring or power supply issues.
It's also possible that a **TMC reports error** shutdown occurs due to
SPI errors that prevent communication with the driver (on tmc2130,
tmc5160, or tmc2660). If this occurs, it's common for the reported
driver status to show `00000000` or `ffffffff` - for example: `TMC
reports error: DRV_STATUS: ffffffff ...` OR `TMC reports error:
READRSP@RDSEL2: 00000000 ...`. Such a failure may be due to an SPI
wiring problem or may be due to a self-reset or failure of the TMC
driver.
## How do I tune spreadcycle/coolstep/etc. mode on my drivers?
The [Trinamic website](https://www.trinamic.com/) has guides on