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docs: Note previous firmware state issue with TMC2209/TMC2209 in TMC_Drivers.md 

If a high UART frequency is used to communicate with TMC2208/TMC2209
drivers then it may not be possible for Klipper to communicate with
the drivers until they are reset.  Note this in the troubleshooting
document.

Reported by @matthewlloyd.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-06-12 14:13:53 -04:00
parent 07004a889d
commit a0c27571dd
1 changed files with 6 additions and 0 deletions
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6
docs/TMC_Drivers.md
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@ -381,6 +381,12 @@ Make sure that the motor power is enabled, as the stepper motor driver
generally needs motor power before it can communicate with the
micro-controller.
If this error occurs after flashing Klipper for the first time, then
the stepper driver may have been previously programmed in a state that
is not compatible with Klipper. To reset the state, remove all power
from the printer for several seconds (physically unplug both USB and
power plugs).
Otherwise, this error is typically the result of incorrect UART pin
wiring or an incorrect Klipper configuration of the UART pin settings.