[AT90USB1286] Add secondary serial support (enhancement) about klipper

[KevinOConnor]

On Sun, Jun 04, 2017 at 04:48:44AM -0700, TunaLatte wrote: As the title suggests, specifically for platforms that emulate usb like at90usb1286.

I put a patch up on a new work-at90-serial-20170605 branch (git fetch ; get checkout work-at90-serial-20170605). Let me know if it works for you.

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-Kevin

Thanks that was very quick, will try ASAP and report.

So I have set the baud rate to 115200, im getting garbled data "?". Tried using default 250000 baud rate, same garbled data : ����������������������������������������������������

Thank you.

[KevinOConnor]

On Thu, Jun 08, 2017 at 02:48:31PM -0700, TunaLatte wrote: So I have set the baud rate to 115200, im getting garbled data "?". Tried using default 25000 baud rate, same garbled data.

Alas, there isn't much assistance I can provide sice I don't have access to the board in question. Do note, however, that the protocol between the micro-controller and the host is a binary protcol (as described in docs/Protocol.md) so what looks like "garbled data" may actually be okay. The klippy/console.py script (as in ```~/klippy-env/bin/python ~/klipper/klippy/console.py /dev/ttyACM0 250000```) can be used to issue and read low-level commands if desired.

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-Kevin

Noted.
For reference: What I get in /tmp/klippy.log
Timeout on serial connect Timeout on serial connect Timeout on serial connect Timeout on serial connect ....

Problem solved after closing this issue: #15. Horray!

(Just printed a wall cube, with transparent pla, im very impressed by the lack of vibrations being visible on each layer, making it more glass. Printing a circle now, more clear/transparent, and no sharp outer layer feel. The difference in motor noise between this and Marlin is significant, also this is the first time the printer is able to do Z travel speed at >30mm/s, even when all axis are moving at the same time like what curaengine slicer does at the beginning of a print, using modified bed printrbot jr here +using old router with internal serial connected to the mcu, 800mhz mips, Ill attempt to run klippy on it later (hopefully its not too slow), for now its just a wireless serial bridge, esp8266 is kinda unstable.)
Many thanks and great work, I'll try to help as long as I'm using it. (no reason I wont anytime soon tho :))

EDIT:Note for newcomers to save time, to use your marlin steps per millimeter, just divide 1 / yourstepspermillimter to obtain the value for printer.conf, also maximum number of digits is 7, else printer will fail to home.
My config for reference printrbotjr.txt

[KevinOConnor]

Thanks - I committed this change to the master branch ( b8094de ).