3.5.0-B4+ 1LC Stack Overflow causing reset

engikeneer

@gloomyandy no T0 and T1 are the same (it's an e3D TC with hemeras, 0.4mm v6 etc). Only difference I can think is that T0 has a hotend grounding resistor wired in, which T1 doesn't, but that has not been an issue in the past...

dc42

@engikeneer I think what may be happening is that a debug message is being generated, and owing to a change in the way that debug messages are processed the Heat task stack is now too small when this happens. Please try the new tool board firmware at https://www.dropbox.com/scl/fo/sj9kuloenbp6e70asnxue/h?rlkey=upykfuquc574l61deqwo94xr3&dl=0.

engikeneer

@dc42 Thanks for providing this. I have tested and it does solve the crashing issue, and explains why there was an issue with the heat task stack... I was getting a heater fault occurring on T1. It may have also not helped that I didn't have a heater-fault.g file. Now I just need to work out why the fault was happening...

dc42

@engikeneer thanks. A debug message was being generated for some types of heater fault. In previous builds they were suppressed if the build configuration didn't specify a serial debug port, but now they are relayed over CAN to the main board instead.

The amount of free RAM will have decreased because of the increased stack size, so please monitor "Never used RAM" in the M122 report for the tool board.

engikeneer

@dc42 Good news is that I don't seem to be having any RAM issues Never used RAM seems to be steady at 2728:

M122 B22
Diagnostics for board 22:
Duet TOOL1LC rev 1.1 or later firmware version 3.5.0-beta.4+ (2023-07-26 12:19:38)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
All averaging filters OK
Never used RAM 2728, free system stack 88 words
Tasks: Move(3,nWait,0.0%,71) HEAT(2,nWait,0.3%,87) CanAsync(5,nWait,0.0%,54) CanRecv(3,nWait,0.1%,75) CanClock(5,nWait,0.0%,66) ACCEL(3,nWait,0.0%,53) TMC(2,delaying,3.0%,57) MAIN(1,running,91.8%,324) IDLE(0,ready,0.0%,27) AIN(2,delaying,4.8%,114), total 100.0%
Last reset 00:45:46 ago, cause: power up
Last software reset at 2023-07-21 22:45, reason: StackOverflow, available RAM 3864, slot 2
Software reset code 0x0100 ICSR 0x0000000e SP 0x20007f44 Task HEAT Freestk 3644 bad marker
Stack: 200045f8 2000462c 0001c55b 00000000 43520000 000000ab 0001b701 20003bc4 fffffffd f6bd5ddf 00000000 00000002 00000000 00000002 0001c1af 00000000 200019b4 20001958 20001a80 000226ec 20001958 200019b4 00000032 20001ad4 00005f95 00000001 20001b30
Driver 0: pos 0, 410.0 steps/mm, ok, SG min 0, read errors 0, write errors 0, ifcnt 25, reads 61617, writes 25, timeouts 4, DMA errors 0, CC errors 0, failedOp 0x6a, steps req 0 done 205224
Moves scheduled 2427, completed 2427, in progress 0, hiccups 45, segs 41, step errors 0, maxPrep 1361, maxOverdue 60251, maxInc 13299, mcErrs 0, gcmErrs 0, ebfmin -0.72 max 1.00
Peak sync jitter -5/8, peak Rx sync delay 300, resyncs 0/0, no timer interrupt scheduled
VIN voltage: min 24.3, current 24.3, max 24.5
MCU temperature: min 23.2C, current 46.6C, max 46.6C
Last sensors broadcast 0x00000008 found 1 241 ticks ago, 0 ordering errs, loop time 1
CAN messages queued 55026, send timeouts 0, received 60157, lost 0, free buffers 18, min 17, error reg 0
dup 0, oos 0/0/0/0, bm 0, wbm 0, rxMotionDelay 483, adv 35679/74655
Accelerometer: LIS3DH, status: 00
Inductive sensor: not found
I2C bus errors 0, naks 6, other errors 0

One thing I have noticed with the 3.5.0-B4+ build you provided is that I get a false error appearing when homing my printer during a print. I think this was present in the previous B4+ build you provided but can't be sure.

Error: Failed to home axes

I created a print file with only G28 in it, and I get that error (despite all axes homing fine). If I run a G28 normally, then I get no error.
This isn't causing any particular issue, it's just annoying getting the false error messages. My homing files below - happy to provide the sub-macros if needed
Thanks

homeall

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Sat May 29 2021 21:13:21 GMT+0100 (British Summer Time)

M98 P"homec.g"			; Home C (ToolHead)

M98 P"homea.g"			; Home A (Pebble Wiper)

M98 P"homey.g"			; Home Y

M98 P"homex.g"			; Home X

M98 P"homez.g"			; Home Z

homec

; homec.g
; called to home the C axis
;

;from old

G92 C260
M913 C40			; C MOTOR TO 40% CURRENT
G1 C-260 F2400  ; drive the C-axis to the stop
M913 C100			; C MOTOR TO 100% CURRENT
G1 C1 F50000
G92 C0

;Open Coupler
M98 P"/macros/Tool - Unlock"

homea

;called to home axis A

G91               ; relative positioning
G1 H1 A50 F1500 ; move quickly to A axis endstop and stop there (first pass)
G1 A-2 F2000       ; go back a few mm
G1 H1 A50 F360  ; move slowly to A axis endstop once more (second pass)
G90               ; absolute positioning

homex

; homex.g
; called to home the X axis
;
G91 			; use relative positioning
M98 P"/macros/Set Machine Limits"

M400 			; make sure everything has stopped before we make changes
M569 P0.0 D3 V10 
M569 P0.1 D3 V10 
G4 P100			; wait 100ms
M17 X Y						    ; Energize Motors X Y
M913 X50 Y50 		; drop motor currents to 50%
M915 H200 X Y S0 R0 F0 	; set X and Y to sensitivity 0, do nothing when stall, unfiltered
G4 P100
G1 H2 Z3 F5000		; lift Z 3mm
G1 H2 X1 Y1 F3000		; energise to avoid false triggers during sensorless homing
M400
G4 P100	
G1 H1 X-400 F6000 	; move left 400mm, stopping at the endstop
G1 H1 X2 F2000 		; move away from endstop
G1 H2 Z-3 F1200		; lower Z

G90 			; back to absolute positioning
M400 			; make sure everything has stopped before we reset the motor currents
M913 X100 Y100 		; motor currents back to 100%
M569 P0.0 D2
M569 P0.1 D2

homey

; homey.g
; called to home the Y axis
;

G91 			; use relative positioning
M98 P"/macros/Set Machine Limits"
M400 			; make sure everything has stopped before we make changes
M569 P0.0 D3 V10 
M569 P0.1 D3 V10 
G4 P100			; wait 100ms
M17 X Y						    ; Energize Motors X Y
M913 X50 Y50 		; drop motor currents to 50%
M915 H200 X Y S0 R0 F0 	; set X and Y to sensitivity 0, do nothing when stall, unfiltered
G4 P100
G1 H2 Z3 F5000		; lift Z 3mm
G1 H2 X1 Y1 F3000		; energise to avoid false triggers during sensorless homing
M400
G4 P100		
G1 H1 Y-400 F6000 	; move left 400mm, stopping at the endstop
G1 H1 Y2 F2000 		; move away from end
G1 H2 Z-3 F1200		; lower Z

G90 			; back to absolute positioning
M400 			; make sure everything has stopped before we reset the motor currents
M913 X100 Y100 		; motor currents back to 100%
M569 P0.0 D2
M569 P0.1 D2

homez

; homez.g
; called to home the Z axis

T-1       				;just in case there is a tool coupled, go try to drop it at the dock
M116 H0 S1				; Wait for bed to reach temp;
G29 S2 					; Disable mesh compensation
G91 					; Relative mode
G1 H2 Z5 F5000			; Lower the bed
G90						; back to absolute positioning
G1 X150 Y100 F50000		; Position the endstop above the bed centre
G91 					; Relative mode
G4 P1000				; wait 1000msec
G30 					; probe
G1 Z20 F5000			; Drop the Bed
G90						; Back to absolute positioning

gloomyandy

@engikeneer I think it would help if you try manually homing each axis in turn to identify which one is producing that error message.

engikeneer

@gloomyandy good thinking - I can confirm it is the Z homing that causes the issue. I homed all axes then one-by-one ran print jobs with just G28 X, G28 Y etc in and it was G28 Z that triggered it. I also ran it with commenting out a few lines in my homez and I think the one causing the issue is the M116:

; homez.g
; called to home the Z axis

T-1       			;just in case there is a tool coupled, go try to drop it at the dock
M116 H0 S1			; Wait for bed to reach temp;  <<<< THIS ONE
G29 S2 				; Disable mesh compensation
G91 				; Relative mode
G1 H2 Z5 F5000			; Lower the bed
G90				; back to absolute positioning
G1 X150 Y100 F50000		; Position the endstop above the bed centre
G91 				; Relative mode
G4 P1000			; wait 1000msec
G30 				; probe
G1 Z20 F5000			; Drop the Bed
G90				; Back to absolute positioning

dc42

@engikeneer when you get that error message, is the bed heating up?

Do you also get that error message if you command the bed to heat manually and then command Z homing manually?

engikeneer

@dc42 I get the error message whether the bed is off, heating up, or already at temp. I also changed it to a simple M116 (i.e. no H0 S1) and same result.

If I do any of this not in a print (i.e. just manually by hitting homez in DWC, or putting G28 Z in the console), I do not get the error.

dc42

@engikeneer I believe this is fixed in 3.5.0-rc.1.