Enabing fans on SKR Pro v1.2

[6XoCtujg2C0gne]

I've added: -D FANS_ENABLE=1
to the [env:btt_skr_pro_1_1] section of my platformio.ini in order to enable a fan. The code compiles just fine.
Upon boot I get a code 10 error.

GrblHAL 1.1f ['$' or '$HELP' for help]
Alarm:10 -
[VER:1.1f.20250611:]
[OPT:VNM0SL,100,1024,3,0]
[AXS:3:XYZ]
[NEWOPT:ENUMS,RT+,PROBES=1,ES,SED]
[FIRMWARE:grblHAL]
[SIGNALS:HSEP]
[NVS STORAGE:*FLASH]
[FREE MEMORY:88K]
[DRIVER:STM32F407]
[DRIVER VERSION:250609]
[BOARD:BTT SKR PRO v1.1]
[AUX IO:1,0,0,0]
[PLUGIN:Bootloader Entry v0.03]
[PLUGIN:Fans v0.17]
[FANS:0]
[G54:0.000,0.000,0.000]
[G55:0.000,0.000,0.000]
[G56:0.000,0.000,0.000]
[G57:0.000,0.000,0.000]
[G58:0.000,0.000,0.000]
[G59:0.000,0.000,0.000]
[G59.1:0.000,0.000,0.000]
[G59.2:0.000,0.000,0.000]
[G59.3:0.000,0.000,0.000]
[G28:0.000,0.000,0.000]
[G30:0.000,0.000,0.000]
[G92:0.000,0.000,0.000]
[TLO:0.000,0.000,0.000]
[PRB:0.000,0.000,0.000:0]
[SPINDLE:0|0|0|*DLIRV|PWM|0.0,1000.0]

$pins
[PIN:PD11,Feed hold]
[PIN:PG2,Cycle start]
[PIN:PG6,Emergency stop]
[PIN:PA1,Probe]
[PIN:PB10,X limit min]
[PIN:PE12,Y limit min]
[PIN:PG8,Z limit min]
[PIN:PG4,Aux in 0,P0]
[PIN:PE9,X step]
[PIN:PE11,Y step]
[PIN:PE13,Z step]
[PIN:PF1,X dir]
[PIN:PE8,Y dir]
[PIN:PC2,Z dir]
[PIN:PF2,X enable]
[PIN:PD7,Y enable]
[PIN:PC0,Z enable]
[PIN:PE5,Spindle on]
[PIN:PE6,Spindle direction]
[PIN:PA8,Spindle PWM]
[PIN:PD14,Mist]
[PIN:PB1,Flood]
[PIN:PA10,RX,UART1]
[PIN:PA9,TX,UART1]
[PIN:PD9,RX,UART2]
[PIN:PD8,TX,UART2]
[PIN:PC7,RX,UART3]
[PIN:PC6,TX,UART3]

Any ideas why this error?

[terjeio]

See this.

[6XoCtujg2C0gne]

I was actually referring to the FANS issue. I didn't see anything in reference to fans on that page.

[terjeio]

You reported this:

Upon boot I get a code 10 error.
GrblHAL 1.1f ['$' or '$HELP' for help]
Alarm:10 -
...

which my reply was adressing.

A bit odd that ioSender is exiting - that could be due to the alarm, so get that out of the way first.
BTW from the $pins report I see that there are no aux. outputs available so the fans plugin cannot be used unless you either modify the map or free up a pin - e.g the spindle direction pin if that is unsed.

[6XoCtujg2C0gne]

In the boards file the pins are already specified as the correct ones. PE6 or 5 comes to mind which are the correct ones for FAN1 and FAN2 but FAN0 is being used as spindle PWM. Jun 15, 2025 2:26:43 PM Terje Io ***@***.***>:

…

You reported this: Upon boot I get a code 10 error. GrblHAL 1.1f ['$' or '$HELP' for help] Alarm:10 - ... which my reply was adressing. A bit odd that ioSender is exiting - that could be due to the alarm, so get that out of the way first. BTW from the *$pins* report I see that there are no aux. outputs available so the fans plugin cannot be used unless you either modify the map or free up a pin - e.g the spindle direction pin if that is unsed. — Reply to this email directly, view it on GitHub[#237 (comment)], or unsubscribe[https://github.com/notifications/unsubscribe-auth/ABFIKPMEUCVAJ7752SCIBU33DXCHFAVCNFSM6AAAAAB7LNCNT2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGNBXGYZDQMQ]. You are receiving this because you authored the thread. [Tracking image][https://github.com/notifications/beacon/ABFIKPMF25JLDOHL3DNNEAD3DXCHFA5CNFSM6AAAAAB7LNCNT2WGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAZWQ3U.gif]

[dresco]

Yes, but all aux outputs are in use already, hence nothing for the fans plugin to claim..

From the standard map file, there are the 5 aux outputs defined here. And you can see from just below that (and from your $pins output), that 3 are being used for spindle control, and 2 for coolant.

As Terje says, you will need to free up one of these, or add another aux output..

[6XoCtujg2C0gne]

Hi Jon, Thanks for your reply! Are there any examples for adding an AUX output port? From: Jon Escombe ***@***.***> Sent: Monday, June 16, 2025 3:43 AM To: grblHAL/STM32F4xx ***@***.***> Cc: Andy (gardenweazel) Lewis ***@***.***>; Author ***@***.***> Subject: Re: [grblHAL/STM32F4xx] Enabing fans on SKR Pro v1.2 (Discussion #237) Yes, but all aux outputs are in use already, hence nothing for the fans plugin to claim.. From the standard map file, there are the 5 aux outputs defined here <https://github.com/grblHAL/STM32F4xx/blob/d44d3ff2799a1887a9f52dc0aab4f1946599a9cc/boards/btt_skr_pro_v1_1_map.h#L121-L130> . And you can see from just below that (and from your $pins output), that 3 are being used for spindle control, and 2 for coolant. As Terje says, you will need to free up one of these, or add another aux output.. — Reply to this email directly, view it on GitHub <#237 (reply in thread)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABFIKPKGZONTB4AVIPTMY2L3DZ7R5AVCNFSM6AAAAAB7LNCNT2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGNBYGA3TGNA> . You are receiving this because you authored the thread. <https://github.com/notifications/beacon/ABFIKPP3XD6NL6HLRI6UEKD3DZ7R5A5CNFSM6AAAAAB7LNCNT2WGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAZWZR4.gif> Message ID: ***@***.*** ***@***.***> >

[terjeio]

If you are not using spindle direction add
-D SPINDLE0_ENABLE=12
to platformio.ini - this will free up the spindle direction output.

[6XoCtujg2C0gne]

It’s a no-go: GrblHAL 1.1f ['$' or '$HELP' for help] [VER:1.1f.20250611:] [OPT:VNM0SL2,100,1024,4,0] [AXS:4:XYZA] [NEWOPT:ENUMS,RT+,PROBES=1,ES,SED] [FIRMWARE:grblHAL] [SIGNALS:HSEP] [NVS STORAGE:*FLASH] [FREE MEMORY:86K] [DRIVER:STM32F407] [DRIVER VERSION:250609] [BOARD:BTT SKR PRO v1.1] [AUX IO:1,0,0,0] [PLUGIN:Bootloader Entry v0.03] [PLUGIN:Trinamic v0.30] [G54:0.000,0.000,0.000,0.000] [G55:0.000,0.000,0.000,0.000] [G56:0.000,0.000,0.000,0.000] [G57:0.000,0.000,0.000,0.000] [G58:0.000,0.000,0.000,0.000] [G59:0.000,0.000,0.000,0.000] [G59.1:0.000,0.000,0.000,0.000] [G59.2:0.000,0.000,0.000,0.000] [G59.3:0.000,0.000,0.000,0.000] [G28:0.000,0.000,0.000,0.000] [G30:0.000,0.000,0.000,0.000] [G92:0.000,0.000,0.000,0.000] [TLO:0.000,0.000,0.000,0.000] [PRB:0.000,0.000,0.000,0.000:0] [SPINDLE:0|0|0|*DLIRV|PWM|0.0,1000.0] $pins [PIN:PD11,Feed hold] [PIN:PG2,Cycle start] [PIN:PG6,Emergency stop] [PIN:PA1,Probe] [PIN:PB10,X limit min] [PIN:PE12,Y limit min] [PIN:PG5,Y limit min 2] [PIN:PG8,Z limit min] [PIN:PE15,A limit min] [PIN:PG4,Aux in 0,P0] [PIN:PE9,X step] [PIN:PE11,Y step] [PIN:PD15,Y2 step] [PIN:PE13,Z step] [PIN:PE14,A step] [PIN:PF1,X dir] [PIN:PE8,Y dir] [PIN:PE7,Y2 dir] [PIN:PC2,Z dir] [PIN:PA0,A dir] [PIN:PF2,X enable] [PIN:PD7,Y enable] [PIN:PA3,Y enable] [PIN:PC0,Z enable] [PIN:PC3,A enable] [PIN:PE5,Spindle on] [PIN:PE6,Spindle direction] [PIN:PA8,Spindle PWM] [PIN:PD14,Mist] [PIN:PB1,Flood] [PIN:PC13,UART X] [PIN:PE3,UART Y] [PIN:PE1,UART Z] [PIN:PD4,UART M3] [PIN:PD1,UART M4] [PIN:PA10,RX,UART1] [PIN:PA9,TX,UART1] [PIN:PD9,RX,UART2] [PIN:PD8,TX,UART2] [PIN:PC7,RX,UART3] [PIN:PC6,TX,UART3] M106 P0 error:20 - Unsupported or invalid g-code command found in block. M106 P1 error:20 - Unsupported or invalid g-code command found in block. M106 P2 error:20 - Unsupported or invalid g-code command found in block. From: Terje Io ***@***.***> Sent: Monday, June 16, 2025 12:13 PM To: grblHAL/STM32F4xx ***@***.***> Cc: Andy (gardenweazel) Lewis ***@***.***>; Author ***@***.***> Subject: Re: [grblHAL/STM32F4xx] Enabing fans on SKR Pro v1.2 (Discussion #237) If you are not using spindle direction add -D SPINDLE0_ENABLE=12 to platformio.ini - this will free up the spindle direction output. <https://github.com/grblHAL/core/blob/596576763e88f2bcd288b5f3d729d0b1cb1e85af/spindle_control.h#L41> — Reply to this email directly, view it on GitHub <#237 (reply in thread)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABFIKPOUSL75DFEDPXGRLD33D33INAVCNFSM6AAAAAB7LNCNT2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGNBYGY3TSMI> . You are receiving this because you authored the thread. <https://github.com/notifications/beacon/ABFIKPJG6MTKD5WD5PNWNWT3D33INA5CNFSM6AAAAAB7LNCNT2WGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAZXFMO.gif> Message ID: ***@***.*** ***@***.***> >

[6XoCtujg2C0gne]

Actually I did a clean and recompiled and have a good image now. I’m still getting the M106 error. Note that pin PE6 is FAN2. GrblHAL 1.1f ['$' or '$HELP' for help] [VER:1.1f.20250611:] [OPT:VNMD0SL2,100,1024,4,0] [AXS:4:XYZA] [NEWOPT:ENUMS,RT+,PROBES=1,ES,SED] [FIRMWARE:grblHAL] [SIGNALS:HSEP] [NVS STORAGE:*FLASH] [FREE MEMORY:86K] [DRIVER:STM32F407] [DRIVER VERSION:250609] [BOARD:BTT SKR PRO v1.1] [AUX IO:0,1,0,0] [PLUGIN:Bootloader Entry v0.03] [PLUGIN:Trinamic v0.30] [PLUGIN:Laser coolant v0.08] [PLUGIN:Fans v0.17] [FANS:0] [G54:0.000,0.000,0.000,0.000] [G55:0.000,0.000,0.000,0.000] [G56:0.000,0.000,0.000,0.000] [G57:0.000,0.000,0.000,0.000] [G58:0.000,0.000,0.000,0.000] [G59:0.000,0.000,0.000,0.000] [G59.1:0.000,0.000,0.000,0.000] [G59.2:0.000,0.000,0.000,0.000] [G59.3:0.000,0.000,0.000,0.000] [G28:0.000,0.000,0.000,0.000] [G30:0.000,0.000,0.000,0.000] [G92:0.000,0.000,0.000,0.000] [TLO:0.000,0.000,0.000,0.000] [PRB:0.000,0.000,0.000,0.000:0] [SPINDLE:0|0|0|*LIRV|PWM|0.0,1000.0] $pins [PIN:PD11,Feed hold] [PIN:PG2,Cycle start] [PIN:PG6,Emergency stop] [PIN:PA1,Probe] [PIN:PB10,X limit min] [PIN:PE12,Y limit min] [PIN:PG5,Y limit min 2] [PIN:PG8,Z limit min] [PIN:PE15,A limit min] [PIN:PG4,Aux in 0,Coolant ok] [PIN:PE9,X step] [PIN:PE11,Y step] [PIN:PD15,Y2 step] [PIN:PE13,Z step] [PIN:PE14,A step] [PIN:PF1,X dir] [PIN:PE8,Y dir] [PIN:PE7,Y2 dir] [PIN:PC2,Z dir] [PIN:PA0,A dir] [PIN:PF2,X enable] [PIN:PD7,Y enable] [PIN:PA3,Y enable] [PIN:PC0,Z enable] [PIN:PC3,A enable] [PIN:PE5,Spindle on] [PIN:PA8,Spindle PWM] [PIN:PD14,Mist] [PIN:PB1,Flood] [PIN:PE6,Aux out 1,P0] [PIN:PC13,UART X] [PIN:PE3,UART Y] [PIN:PE1,UART Z] [PIN:PD4,UART M3] [PIN:PD1,UART M4] [PIN:PA10,RX,UART1] [PIN:PA9,TX,UART1] [PIN:PD9,RX,UART2] [PIN:PD8,TX,UART2] [PIN:PC7,RX,UART3] [PIN:PC6,TX,UART3] M106 error:20 - Unsupported or invalid g-code command found in block. From: Terje Io ***@***.***> Sent: Monday, June 16, 2025 12:13 PM To: grblHAL/STM32F4xx ***@***.***> Cc: Andy (gardenweazel) Lewis ***@***.***>; Author ***@***.***> Subject: Re: [grblHAL/STM32F4xx] Enabing fans on SKR Pro v1.2 (Discussion #237) If you are not using spindle direction add -D SPINDLE0_ENABLE=12 to platformio.ini - this will free up the spindle direction output. <https://github.com/grblHAL/core/blob/596576763e88f2bcd288b5f3d729d0b1cb1e85af/spindle_control.h#L41> — Reply to this email directly, view it on GitHub <#237 (reply in thread)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABFIKPOUSL75DFEDPXGRLD33D33INAVCNFSM6AAAAAB7LNCNT2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGNBYGY3TSMI> . You are receiving this because you authored the thread. <https://github.com/notifications/beacon/ABFIKPJG6MTKD5WD5PNWNWT3D33INA5CNFSM6AAAAAB7LNCNT2WGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAZXFMO.gif> Message ID: ***@***.*** ***@***.***> >

[dresco]

What is your $386 setting? It should be set to 1 for Aux out 1

You will need to restart the controller after setting, the assignment should then show up in the $pins report..

Example output from a dev board, with $386=1

$pins
...
[PIN:PB11,Aux out 0,P0]
[PIN:PE2,Aux out 1,Fan 0]
[PIN:PF0,Aux out 2,P1]
[PIN:PE5,Aux analog out 0,E0]
[PIN:PE6,Aux analog out 1,E1]
...

[6XoCtujg2C0gne]

ioSender doesn’t allow me to save $386=1 GrblHAL 1.1f ['$' or '$HELP' for help] [VER:1.1f.20250611:] [OPT:VNMD0SL2,100,1024,4,0] [AXS:4:XYZA] [NEWOPT:ENUMS,RT+,PROBES=1,ES,SED] [FIRMWARE:grblHAL] [SIGNALS:HSEP] [NVS STORAGE:*FLASH] [FREE MEMORY:86K] [DRIVER:STM32F407] [DRIVER VERSION:250609] [BOARD:BTT SKR PRO v1.1] [AUX IO:0,1,0,0] [PLUGIN:Bootloader Entry v0.03] [PLUGIN:Trinamic v0.30] [PLUGIN:Laser coolant v0.08] [PLUGIN:Fans v0.17] [FANS:0] ok $0=10.0 $1=25 $2=0 $3=1 $4=11 $5=0 $6=0 $8=0 $9=3 $10=511 $11=0.010 $12=0.002 $13=0 $14=70 $15=0 $16=0 $17=0 $18=0 $19=0 $20=0 $21=0 $22=0 $23=3 $24=25.0 $25=500.0 $26=250 $27=4.000 $28=0.000 $29=0.0 $30=1000.000 $31=0.000 $32=1 $33=5000.0 $34=0.0 $35=0.0 $36=100.0 $37=0 $39=1 $40=0 $43=1 $44=1 $45=2 $46=0 $47=0 $62=0 $63=0 $64=0 $65=0 $100=200.00000 $101=200.00000 $102=0.00000 $103=200.00000 $110=2000.000 $111=2000.000 $112=0.000 $113=2000.000 $120=30.000 $121=30.000 $122=0.000 $123=30.000 $130=666.000 $131=714.000 $132=0.000 $133=200.000 $140=700 $141=700 $142=500 $143=700 $150=16 $151=16 $152=16 $153=16 $170=0.000 $171=0.000 $172=0.000 $173=0.000 $200=22.0 $201=22.0 $202=22.0 $203=22.0 $210=50 $211=50 $212=50 $213=50 $220=22.0 $221=22.0 $222=22.0 $223=22.0 $338=15 $339=0 $341=0 $342=30.0 $343=25.0 $344=200.0 $345=200.0 $346=1 $347=5.0 $348=2.500 $349=25.000 $370=0 $372=0 $376=1 $378=0.0 $379=0.0 $384=0 $386=0.0 $391=0.0 $394=0.0 $398=100 $480=0.0 $481=0 $483=1 $484=1 $486=0 $538=0 $539=0.0 $673=0.0 $676=3 $680=0 ok [GC:G0 G54 G17 G21 G90 G94 G49 G98 G50 M5 M9 T0 F0 S0.] ok [G54:0.000,0.000,0.000,0.000] [G55:0.000,0.000,0.000,0.000] [G56:0.000,0.000,0.000,0.000] [G57:0.000,0.000,0.000,0.000] [G58:0.000,0.000,0.000,0.000] [G59:0.000,0.000,0.000,0.000] [G59.1:0.000,0.000,0.000,0.000] [G59.2:0.000,0.000,0.000,0.000] [G59.3:0.000,0.000,0.000,0.000] [G28:0.000,0.000,0.000,0.000] [G30:0.000,0.000,0.000,0.000] [G92:0.000,0.000,0.000,0.000] [TLO:0.000,0.000,0.000,0.000] [PRB:0.000,0.000,0.000,0.000:0] ok $pins [PIN:PD11,Feed hold] [PIN:PG2,Cycle start] [PIN:PG6,Emergency stop] [PIN:PA1,Probe] [PIN:PB10,X limit min] [PIN:PE12,Y limit min] [PIN:PG5,Y limit min 2] [PIN:PG8,Z limit min] [PIN:PE15,A limit min] [PIN:PG4,Aux in 0,Coolant ok] [PIN:PE9,X step] [PIN:PE11,Y step] [PIN:PD15,Y2 step] [PIN:PE13,Z step] [PIN:PE14,A step] [PIN:PF1,X dir] [PIN:PE8,Y dir] [PIN:PE7,Y2 dir] [PIN:PC2,Z dir] [PIN:PA0,A dir] [PIN:PF2,X enable] [PIN:PD7,Y enable] [PIN:PA3,Y enable] [PIN:PC0,Z enable] [PIN:PC3,A enable] [PIN:PE5,Spindle on] [PIN:PA8,Spindle PWM] [PIN:PD14,Mist] [PIN:PB1,Flood] [PIN:PE6,Aux out 1,P0] [PIN:PC13,UART X] [PIN:PE3,UART Y] [PIN:PE1,UART Z] [PIN:PD4,UART M3] [PIN:PD1,UART M4] [PIN:PA10,RX,UART1] [PIN:PA9,TX,UART1] [PIN:PD9,RX,UART2] [PIN:PD8,TX,UART2] [PIN:PC7,RX,UART3] [PIN:PC6,TX,UART3] ok From: Jon Escombe ***@***.***> Sent: Tuesday, June 17, 2025 4:15 AM To: grblHAL/STM32F4xx ***@***.***> Cc: Andy (gardenweazel) Lewis ***@***.***>; Author ***@***.***> Subject: Re: [grblHAL/STM32F4xx] Enabing fans on SKR Pro v1.2 (Discussion #237) What is your $386 setting <https://github.com/grblHAL/Plugin_fans> ? It should be set to 1 for Aux out 1 You will need to restart the controller after setting, the assignment should then show up in the $pins report.. Example output from a dev board, with $386=1 $pins ... [PIN:PB11,Aux out 0,P0] [PIN:PE2,Aux out 1,Fan 0] [PIN:PF0,Aux out 2,P1] [PIN:PE5,Aux analog out 0,E0] [PIN:PE6,Aux analog out 1,E1] ... — Reply to this email directly, view it on GitHub <#237 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABFIKPPCDT5BMB4EELDIV2D3D7MC7AVCNFSM6AAAAAB7LNCNT2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGNBZGQZDGNQ> . You are receiving this because you authored the thread. <https://github.com/notifications/beacon/ABFIKPNFT36FEMRPQEDLSWL3D7MC7A5CNFSM6AAAAAB7LNCNT2WGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAZXT5Y.gif> Message ID: ***@***.*** ***@***.***> >

[6XoCtujg2C0gne]

Something isn't stacking up here. Note the areas that I have highlighted.

GrblHAL 1.1f ['$' or '$HELP' for help]
[VER:1.1f.20250611:]
[OPT:VNMD0SL2,100,1024,4,0]
[AXS:4:XYZA]
[NEWOPT:ENUMS,RT+,PROBES=1,ES,SED]
[FIRMWARE:grblHAL]
[SIGNALS:HSEP]
[NVS STORAGE:*FLASH]
[FREE MEMORY:86K]
[DRIVER:STM32F407]
[DRIVER VERSION:250609]
[BOARD:BTT SKR PRO v1.1]
[AUX IO:0,1,0,0]
[PLUGIN:Bootloader Entry v0.03]
[PLUGIN:Trinamic v0.30]
[PLUGIN:Laser coolant v0.08]
[PLUGIN:Fans v0.17]
[FANS:0]
[G54:0.000,0.000,0.000,0.000]
[G55:0.000,0.000,0.000,0.000]
[G56:0.000,0.000,0.000,0.000]
[G57:0.000,0.000,0.000,0.000]
[G58:0.000,0.000,0.000,0.000]
[G59:0.000,0.000,0.000,0.000]
[G59.1:0.000,0.000,0.000,0.000]
[G59.2:0.000,0.000,0.000,0.000]
[G59.3:0.000,0.000,0.000,0.000]
[G28:0.000,0.000,0.000,0.000]
[G30:0.000,0.000,0.000,0.000]
[G92:0.000,0.000,0.000,0.000]
[TLO:0.000,0.000,0.000,0.000]
[PRB:0.000,0.000,0.000,0.000:0]
[SPINDLE:0|0|0|*LIRV|PWM|0.0,1000.0]
$pins
[PIN:PD11,Feed hold]
[PIN:PG2,Cycle start]
[PIN:PG6,Emergency stop]
[PIN:PA1,Probe]
[PIN:PB10,X limit min]
[PIN:PE12,Y limit min]
[PIN:PG5,Y limit min 2]
[PIN:PG8,Z limit min]
[PIN:PE15,A limit min]
[PIN:PG4,Aux in 0,Coolant ok]
[PIN:PE9,X step]
[PIN:PE11,Y step]
[PIN:PD15,Y2 step]
[PIN:PE13,Z step]
[PIN:PE14,A step]
[PIN:PF1,X dir]
[PIN:PE8,Y dir]
[PIN:PE7,Y2 dir]
[PIN:PC2,Z dir]
[PIN:PA0,A dir]
[PIN:PF2,X enable]
[PIN:PD7,Y enable]
[PIN:PA3,Y enable]
[PIN:PC0,Z enable]
[PIN:PC3,A enable]
[PIN:PE5,Spindle on]
[PIN:PA8,Spindle PWM]
[PIN:PD14,Mist]
[PIN:PB1,Flood]
[PIN:PE6,Aux out 1,P0]
[PIN:PC13,UART X]
[PIN:PE3,UART Y]
[PIN:PE1,UART Z]
[PIN:PD4,UART M3]
[PIN:PD1,UART M4]
[PIN:PA10,RX,UART1]
[PIN:PA9,TX,UART1]
[PIN:PD9,RX,UART2]
[PIN:PD8,TX,UART2]
[PIN:PC7,RX,UART3]
[PIN:PC6,TX,UART3]
M106
error:20 - Unsupported or invalid g-code command found in block.

Finally here's my platformio.ini relevant section:

board = genericSTM32F407VGT6
board_build.ldscript = STM32F407VGTX_BL32K_FLASH.ld
build_flags = ${common.build_flags}
  # See Inc/my_machine.h for options
  -D BOARD_BTT_SKR_PRO_1_1=1
  -D TRINAMIC_ENABLE=2209
  -D ESTOP_ENABLE=1
  # 8MHz crystal
  -D HSE_VALUE=8000000
  -D Y_AUTO_SQUARE=1
  -D HAS_BOOTLOADER=1
  -D USB_SERIAL_CDC=1
  -D **SPINDLE0_ENABLE=12**
  # -D SDCARD_ENABLE=1
  -D LASER_COOLANT_ENABLE=1
  **-D FANS_ENABLE=1**

[terjeio]

There was some bugs in the code that caused port claiming to fail in some circumstances. Fixes committed.

[6XoCtujg2C0gne]

Thanks for that commit! I was successful in compiling. However I did get this warning:

Compiling .pio\build\btt_skr_pro_1_1\lib32c\grbl\spindle_control.o
grbl\settings.c: In function 'settings_init':
grbl\settings.c:3381:41: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
         grbl.tool_table.get_tool_by_idx = settings_get_tool_data;
                                         ^
Compiling .pio\build\btt_skr_pro_1_1\lib32c\grbl\state_machine.o

I've not tried running it and will report back once confirmed.

[6XoCtujg2C0gne]

I'm still getting an error: 2 from the console when I start ioSender XL. It sounds as if its an issue with the g-code initialization. When I enter a M106 I still get an error as follows:

M106 P0
error:20 - Unsupported or invalid g-code command found in block.

[terjeio]

After setting $386=1 you have to power cycle the controller before M106/M107 will work.
Check that the pins command output show the pin assigned to the fan:
[PIN:PE6,Aux out 1,Fan 0]

ioSender will display a button for the fan when enabled:

[6XoCtujg2C0gne]

I can't change $386 period. Tried from GrblHal settings and from command line.

[terjeio]

You did not update the submodules? Latest fans plugin is v0.18.

[6XoCtujg2C0gne]

You are absolutely correct! That was the first file that I merged and suspect I was distracted.

In any case is working now and I thank your for your continued support.