Issues with M106 and naming of Fan with C option

garlicbread

Hi,
I recently updated the firmware from 2.01 to 2.02
on a Duet wifi 1.04 board

Firmware: 2.02(RTOS) (2018-12-24b1)
WiFi Server Version: 1.21
Web Interface Version: 1.22.6

I noticed that my hotend fan wasn't running
it turns out there may be a bug when using the C option to name a fan with the M106 command

It used to be like this in the config

M106 P0 S0 I0 F31 H-1 B1 CPartFan1                             ; Used to cool the part
M106 P2 S0 I0 F31 H1 L1 T60 CHotendFan1                          ; Used to cool the hotend

However I noticed when running this at the console I'd get spurious errors like this
Error: M106: Logical pin H0 is not available to use for fan 2
It was almost as if the name of the fan couldn't exceed 7 characters for fan 2, or 1 character for fan 0

Removing the Fan naming fixed the problem

M106 P0 S0 I0 F31 H-1 B1                             ; Used to cool the part
M106 P2 S0 I0 F31 H1 L1 T60                          ; Used to cool the hotend

Sorry for raising this on github originally btw (I should have read the Readme).

aidar

I belive the format for name is C"name", so you should try : M106 P0 S0 I0 F31 H-1 B1 C"PartFan1"

dc42

@aidar said in Issues with M106 and naming of Fan with C option:

I belive the format for name is C"name", so you should try : M106 P0 S0 I0 F31 H-1 B1 C"PartFan1"

That's correct. In general, string parameters in GCode commands must always be quoted, except for a few older commands that accept filename parameters, where the quotation marks are optional.