Thermocouple Error : "String too long" with RRF 3.3 stable

Philippe71

Using a Duet 6HC motherboard + Duet 3HC daughter-board, 2 thermocouples connected to the thermocouple board V1.1 on the 3HC
Firmware Version: 3.3 stable June 16

Configuration of Thermocouples :

M308 S1 P"1.spi.cs1" Y"thermocouple-max31856" K"k" ; configure sensor 1 as thermocouple on pin sp1.cs1  expansion board 1
M950 H1 C"1.out0" T1                               ; create nozzle heater output on 1.out0 and map it to sensor 1
M143 H1 S498                                       ; set temperature limit for heater 1 to 498C
M307 H1 B0 S1.00                                   ; disable bang-bang mode for the nozzle heater and set PWM limit

M308 S2 P"1.spi.cs0" Y"thermocouple-max31856" K"K" ; configure sensor 0 as thermocouple on pin sp1.cs0  expansion board 1
M950 H2 C"1.out1" T2                               ; create nozzle heater output on 1.out1 and map it to sensor 2
M143 H2 S498                                       ; set temperature limit for heater 2 to 498C
M307 H2 B0 S1.00                                   ; disable bang-bang mode for the nozzle heater and set PWM limit

It worked fine with RRF3.2.2

I switch to RRF 3.3, I get the error message :

M308 S1 P"1.spi.cs1" Y"thermocouple-max31856"
Error: M308: string too long

The heaters switch to error status

Tried with RFF 3.4.0 Beta 4, same error.

Switch back to RRF3.2.2, everything is OK...

What am I doing wrong?

T3P3Tony

@philippe71 thanks, this bug should be fixed in 3.4b5 in the mean time can you try removing the "-" , e.g:

M308 S2 P"1.spi.cs0" Y"thermocouplemax31856" K"K"

This may work.

Philippe71

Thank you Tony.
It works with RRF3.4.0 B5 with the "-" removed...

T3P3Tony

@philippe71 said in Thermocouple Error : "String too long" with RRF 3.3 stable:

Thank you Tony.
It works with RRF3.4.0 B5 with the "-" removed...

Does it work with the - remaining in b5

Philippe71

With RRF3.4.0 B5
thermocouplemax31856 > Works
thermocouple-max31856 > does not work

dc42

@philippe71 please check which firmware version you have on the EXP3HC board, by sending M115 B1. That is where the bug was.

Philippe71

M115 B1
Duet EXP3HC firmware version 3.4.0beta5 (2021-10-12 13:58:36)

dc42

@philippe71 thanks, I marked this to be re-visited for the next 3.4 beta or RC.

EDIT: I found and fixed the other bug that was causing this.