Duet sometimes really slow? - I2C error or?

deckingman

@kazolar said in Duet sometimes really slow? - I2C error or?:

I am almost positive at this point these issues have to do with end stop wires having interference on them from the stepper wiring. ....................................

That might be true in your case but for me, I didn't have any I2C issues from when I installed the board in December 2016 until July(ish) 2018. As far as I can recall, I didn't make any hardware or wiring changes at that time. Also, there are no other threads related to I2C errors which pre-date July 2018 and that date is coincidental with the introduction of RTOS 2.0 firmware.

kazolar

Yes, I didn't have these problems with the 1.x versions, there was an i2c rewrite in 2.0, I couldn't go back to a 2.0 version which predates the rewrite easily as I have some custom changes I need to apply and I need to compile the firmware myself. What appears to happen is the i2c rewrite brought those hardware issues to the surface, because i can't blame the code if replacing the end stop wire fixes a problem. Just because it homed fine before the code change, simply says to me that there was hardware (wiring issue) and the new code is just exposing it. I'd rather shake out the wiring bugs now than have them bite me during a 100 hour print.

deckingman

@dc42 said in Duet sometimes really slow? - I2C error or?:

Ian, you can test the status of the endstops on the DueX by creating additional axes and making them visible. If you create 3 axes then the third one will use the E2 endstop input on the Due X. When that axis is visible, the state of the E2 endstop will show up in the Machine Properties page of the old DWC, and in the M119 response.

Yes I thought about that but maybe you don't remember the problems I had when I tried it before - this thread https://forum.duet3d.com/topic/6677/corexyuvwa-3rd-gantry-homing-solved/. I could only get it to work with the introduction of 2.03 beta2 when you introduced mapping of end stops to axes which is not possible in this RC candidate.

I'll see if a can cobble together some sort of configuration that'll make the end stops visible but as I said before, I won't be able to run the exact same sequence that was proven to provoke the problem unless I can map those additional end stops to the XY axes.

Just out of curiosity, why was that facility withdrawn and can you confirm that it'll be available in 3.0?

Cheers

dc42

@deckingman said in Duet sometimes really slow? - I2C error or?:

Just out of curiosity, why was that facility withdrawn and can you confirm that it'll be available in 3.0?

It messed up the M585 command, which is needed by CNC users, and there was no easy fix. Endstop inputs can be mapped in firmware 3.0, see https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview.

deckingman

@dc42

David,

I just ran "the sequence" as far as I am able (everything apart from homing the upper gantry with mapped endstops). After which I changed (lowered) the temperature threshold for one of the thermostatic fans connected to the Duex5, to force the fan to come on which it did. Then I toggled the E2 end stop whilst observing the status on the machine properties page and that all worked as normal. After which I ran M122 and noted the following:

I2C nak errors 0, send timeouts 1, receive timeouts 0, finishTimeouts 1, resets 0

Is that what you would expect to see?

Cheers

dc42

@deckingman said in Duet sometimes really slow? - I2C error or?:

@dc42

David,

I just ran "the sequence" as far as I am able (everything apart from homing the upper gantry with mapped endstops). After which I changed (lowered) the temperature threshold for one of the thermostatic fans connected to the Duex5, to force the fan to come on which it did. Then I toggled the E2 end stop whilst observing the status on the machine properties page and that all worked as normal. After which I ran M122 and noted the following:

I2C nak errors 0, send timeouts 1, receive timeouts 0, finishTimeouts 1, resets 0

Is that what you would expect to see?

Cheers

Thanks for testing. I was expecting to see 1 reset as well, because it evidently had one I2C transaction error that it recovered from. I will check the code that counts resets.

EDIT: I omitted to increment the reset count at the proper place. I will fix this in the next RC or final release..

deckingman

@dc42 Cool. Do you want to carry on testing?

kazolar

It appears I triggered a condition, and it appears to recover.
M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 2.03RC2-YG2 running on Duet Ethernet 1.02 or later + DueX5
Board ID: 08DGM-9T6BU-FG3S0-7JTD4-3S06K-1A4ZD
Used output buffers: 3 of 24 (18 max)
=== RTOS ===
Static ram: 25676
Dynamic ram: 96832 of which 0 recycled
Exception stack ram used: 396
Never used ram: 8168
Tasks: NETWORK(ready,648) HEAT(blocked,1232) DUEX(suspended,164) MAIN(running,1688) IDLE(ready,156)
Owned mutexes:
=== Platform ===
Last reset 00:32:18 ago, cause: power up
Last software reset time unknown, reason: User, spinning module GCodes, available RAM 8196 bytes (slot 0)
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0441f000 BFAR 0xe000ed38 SP 0xffffffff Task 0x4e49414d
Error status: 8
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 0.0ms, max retries 0
MCU temperature: min 26.6, current 26.7, max 27.7
Supply voltage: min 24.3, current 24.6, max 24.7, under voltage events: 0, over voltage events: 0, power good: yes
Driver 0: standstill, SG min/max 0/93
Driver 1: standstill, SG min/max not available
Driver 2: standstill, SG min/max not available
Driver 3: standstill, SG min/max 0/242
Driver 4: standstill, SG min/max not available
Driver 5: standstill, SG min/max not available
Driver 6: standstill, SG min/max 83/432
Driver 7: standstill, SG min/max 39/449
Driver 8: standstill, SG min/max 0/413
Driver 9: standstill, SG min/max 29/422
Date/time: 2019-05-18 16:08:09
Cache data hit count 4294967295
Slowest loop: 30.12ms; fastest: 0.08ms
I2C nak errors 1, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Move ===
Hiccups: 0, FreeDm: 169, MinFreeDm: 163, MaxWait: 70775ms
Bed compensation in use: none
Bed probe heights: -0.004 0.002 -0.006 0.002 -0.044
=== DDARing ===
Scheduled moves: 434, completed moves: 434, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
Heater 0 is on, I-accum = 0.2
=== GCodes ===
Segments left: 0
Stack records: 2 allocated, 0 in use
Movement lock held by null
http is idle in state(s) 0
telnet is idle in state(s) 0
file is idle in state(s) 0
serial is idle in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 6.51ms; fastest: 0.03ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
HTTP sessions: 1 of 8
Interface state 5, link 100Mbps full duplex

kazolar

@dc42 it recovered, thought not right away -- I have similar commands for each tpostx1.g

;M116 P1
G90
G1 S2 V611.7 F8000
G1 S2 V641.7 F8000
G1 S2 V611.7 F8000
G1 S2 V641.7 F8000
G1 S2 V611.7 F8000
G1 S2 V641.7 F8000
G1 S2 V611.7 F8000
G1 S2 V641.7 F8000
G1 S2 V611.7 F8000
M106 R2

it does a wipe of a the nozzle across a brush, and this operation appeared to start operating in slow motion -- that is, there was a delay between each movement of the wipe, then after the tool change completed, the rest was fine and even the nak error count reset to 0 after another 30 minutes of configuration.

kazolar

@dc42 back to slow motion.

M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 2.03RC2-YG2 running on Duet Ethernet 1.02 or later + DueX5
Board ID: 08DGM-9T6BU-FG3S0-7JTD4-3S06K-1A4ZD
Used output buffers: 1 of 24 (16 max)
=== RTOS ===
Static ram: 25676
Dynamic ram: 96832 of which 0 recycled
Exception stack ram used: 412
Never used ram: 8152
Tasks: NETWORK(ready,520) HEAT(blocked,1232) DUEX(suspended,164) MAIN(running,1688) IDLE(ready,156)
Owned mutexes:
=== Platform ===
Last reset 00:24:42 ago, cause: software
Last software reset at 2019-05-19 11:57, reason: User, spinning module GCodes, available RAM 8152 bytes (slot 3)
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0441f000 BFAR 0xe000ed38 SP 0xffffffff Task 0x4e49414d
Error status: 8
Free file entries: 9
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 75.7ms, max retries 0
MCU temperature: min 24.7, current 25.2, max 26.6
Supply voltage: min 24.2, current 24.5, max 24.7, under voltage events: 0, over voltage events: 0, power good: yes
Driver 0: standstill, SG min/max 0/109
Driver 1: standstill, SG min/max not available
Driver 2: standstill, SG min/max not available
Driver 3: standstill, SG min/max 0/225
Driver 4: standstill, SG min/max not available
Driver 5: standstill, SG min/max not available
Driver 6: standstill, SG min/max 89/428
Driver 7: standstill, SG min/max 9/440
Driver 8: standstill, SG min/max 0/415
Driver 9: standstill, SG min/max 12/433
Date/time: 2019-05-19 12:22:03
Cache data hit count 3661079197
Slowest loop: 121.00ms; fastest: 0.08ms
I2C nak errors 0, send timeouts 24138, receive timeouts 0, finishTimeouts 24138, resets 0
=== Move ===
Hiccups: 0, FreeDm: 169, MinFreeDm: 163, MaxWait: 315729ms
Bed compensation in use: none
Bed probe heights: -0.153 -0.198 0.104 0.111 0.058
=== DDARing ===
Scheduled moves: 359, completed moves: 359, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
Heater 0 is on, I-accum = 0.4
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 0
Stack records: 2 allocated, 1 in use
Movement lock held by aux
http is idle in state(s) 0
telnet is idle in state(s) 0
file is idle in state(s) 0
serial is idle in state(s) 0
aux is idle in state(s) 42 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 124.37ms; fastest: 0.02ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
HTTP sessions: 2 of 8
Interface state 5, link 100Mbps full duplex

kazolar

Stopped being able to sense duex5 end stops entirely, removed the extra resistors, back to testing again.

dc42

@kazolar said in Duet sometimes really slow? - I2C error or?:

RepRapFirmware for Duet 2 WiFi/Ethernet version 2.03RC2-YG2 running on Duet Ethernet 1.02 or later + DueX5

I presume the -YG2 means you are using your own build of RRF. Are you certain that you have taken all of the 2.03RC2 changes into your build, in particular the changes to the CoreNG project?

kazolar

Positive. It wouldn't compile otherwise. For whatever it's worth. Been running fine since I removed the resistors.

deckingman

Thanks to @wilriker, I now have a version of firmware that incorporates the I2C changes but also restores end stop mapping so that I can use the exact same sequence of events that were proven to consistently provoke the errors. I tried it earlier today with no issues but that was not from an overnight shutdown. I'll try it again first thing tomorrow morning.

deckingman

@dc42 David,

For info, I ran "the sequence" again today after an over night shutdown, with @wilriker 's firmware 2.03RC3-M574C (2019-05-28b1) (based on your firmware but with end stop mapping enabled). No problems encountered with movement, no I2C errors reported, and no I2C resets.

Looking good so far........

dc42

@deckingman said in Duet sometimes really slow? - I2C error or?:

@dc42 David,

For info, I ran "the sequence" again today after an over night shutdown, with @wilriker 's firmware 2.03RC3-M574C (2019-05-28b1) (based on your firmware but with end stop mapping enabled). No problems encountered with movement, no I2C errors reported, and no I2C resets.

Looking good so far........

Ian, thanks for the feedback. To be honest, I think you were just lucky that you had no I2C errors on this occasion. However, given the reports of behaviour when you and others tested the 2.03 releases, I am confident that the changes I made to the I2C driver have completely or at least partially solved the original issue. These changes (as well as all the other improvements in the 2.03RC) releases are already in the 3.0beta source code.

deckingman

@dc42 OK. I'll keep testing but only report back if something amiss happens. So no news will be good news.

Errrrr, just had a thought. Since last time when I could provoke errors consistently, I've changed my motor mounts. So when you said, I was just lucky I started to wonder....

These new mounts are aluminium and the old ones were plastic. So the "XYUVWA" motors will now be earthed through the mount and frame whereas before, they were insulated from the frame by the plastic mounts (which was one of the reasons fort changing them). Might it be possible that the reason why I didn't see I2C errors is not luck but more to do with the fact that I've earthed some of the steppers?

I'm not doubting that the firmware changes have fixed the issues but wondering if the root cause was stepper noise, which can be mitigated by earthing the steppers. Thoughts?

I guess it would be interesting to hear from other users if their stepper motors are earthed or not.

deckingman

@dc42

Ignore comments above above about my changing the motor mounts. Having run "the sequence" again today, subsequent M122 report shows:

I2C nak errors 0, send timeouts 1, receive timeouts 0, finishTimeouts 1, resets 1

My take on that is I2C errors occurred but the firmware caught and fixed any problem. So earthing the motors through the mounts didn't affect behaviour.

DocTrucker

@deckingman talking of earths have you got the earth spade near the ethernet connection grounded? Doubt this will effect your issue bit worth doing.

dc42

@deckingman said in Duet sometimes really slow? - I2C error or?:

I'm not doubting that the firmware changes have fixed the issues but wondering if the root cause was stepper noise, which can be mitigated by earthing the steppers. Thoughts?

Un-earthed stepper motors driving rubber belts can build up static charge (think Van de Graaff generator). If the stepper motors are well-insulated from the printer frame via plastic mounts, then the shortest path for the static charge to arc to ground may be to the stepper motor wires. That will in turn cause a ground transient on the Duet or the Duex (whichever one the stepper motor is connected to), and this will affect any I2C transaction that is in progress. So yes, using metal stepper motor mounts may have fixed the root cause.

But I see from your more recent post that you have had another I2C error.