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docs: Move upgrade instructions to the last item in the FAQ 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-12-10 13:39:49 -05:00
parent 080ee0b512
commit 205da598fd
1 changed files with 20 additions and 20 deletions
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docs/FAQ.md
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@ -20,8 +20,8 @@ Frequently asked questions
17. [Will the heaters be left on if the Raspberry Pi crashes?](#will-the-heaters-be-left-on-if-the-raspberry-pi-crashes)
18. [How do I convert a Marlin pin number to a Klipper pin name?](#how-do-i-convert-a-marlin-pin-number-to-a-klipper-pin-name)
19. [How do I cancel an M109/M190 "wait for temperature" request?](#how-do-i-cancel-an-m109m190-wait-for-temperature-request)
20. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
21. [Can I find out whether the printer has lost steps?](#can-i-find-out-whether-the-printer-has-lost-steps)
20. [Can I find out whether the printer has lost steps?](#can-i-find-out-whether-the-printer-has-lost-steps)
21. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
### How can I donate to the project?
@ -442,6 +442,24 @@ terminal tab and issue a FIRMWARE_RESTART command to clear the Klipper
error state. After completing this sequence, the previous heating
request will be canceled and a new print may be started.
### Can I find out whether the printer has lost steps?
In a way, yes. Home the printer, issue a `GET_POSITION` command, run
your print, home again and issue another `GET_POSITION`. Then compare
the values in the `mcu:` line.
This might be helpful to tune settings like stepper motor currents,
accelerations and speeds without needing to actually print something
and waste filament: just run some high-speed moves in between the
`GET_POSITION` commands.
Note that endstop switches themselves tend to trigger at slightly
different positions, so a difference of a couple of microsteps is
likely the result of endstop inaccuracies. A stepper motor itself can
only lose steps in increments of 4 full steps. (So, if one is using 16
microsteps, then a lost step on the stepper would result in the "mcu:"
step counter being off by a multiple of 64 microsteps.)
### How do I upgrade to the latest software?
The general way to upgrade is to ssh into the Raspberry Pi and run:
@ -484,21 +502,3 @@ needed for a software change to take effect.
When upgrading the software, be sure to check the
[config changes](Config_Changes.md) document for information on
software changes that may require updates to your printer.cfg file.
### Can I find out whether the printer has lost steps?
In a way, yes. Home the printer, issue a `GET_POSITION` command, run
your print, home again and issue another `GET_POSITION`. Then compare
the values in the `mcu:` line.
This might be helpful to tune settings like stepper motor currents,
accelerations and speeds without needing to actually print something
and waste filament: just run some high-speed moves in between the
`GET_POSITION` commands.
Note that endstop switches themselves tend to trigger at slightly
different positions, so a difference of a couple of microsteps is
likely the result of endstop inaccuracies. A stepper motor itself can
only lose steps in increments of 4 full steps. (So, if one is using 16
microsteps, then a lost step on the stepper would result in the "mcu:"
step counter being off by a multiple of 64 microsteps.)