STM32H743XX MCU Temperature

Features
1

I have a question how to add the stm32 temperature sensor in klipper?

2

Easy peasy, add the following statement to your printer.cfg:

[temperature_sensor mcu_temp]
sensor_type: temperature_mcu
min_temp: 0
max_temp: 100

I’ve defined the controller as “mcu”, as in:

[mcu]
serial: /dev/serial/by-id/usb-Klipper_stm32f407xx_##UNIQUE#USB#SERIAL#HERE##-if00
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3

Thank you but I tried this already. I have a BTT SKR3 and when i add the sensor it answers ADC_TEMPERATURE not found.

4

Please post your klippy.log

5

klippy.log (372.9 KB)

6

You have:

[temperature_sensor mcu_temp]
sensor_type = temperature_mcu
min_temp = 0
max_temp = 100

I believe it should be:

[temperature_sensor mcu_temp]
sensor_type: temperature_mcu
min_temp: 0
max_temp: 100

It looks like you’re using an equals sign (“=”) when you should be using a colon (“:”). It seems like you use equals everywhere - I think you need to go through your .cfg files and make sure you have the correct statement assignment character.

7

Thats strange when I look in my printer.cfg I have (“:“).

And that is the Klipper error:

Pin ‘ADC_TEMPERATURE’ is not a valid pin name on mcu ‘mcu’

Once the underlying issue is corrected, use the “RESTART”
command to reload the config and restart the host software.
Printer is halted

8

It seems that at some point the colons are replaced. Sorry about that.

Now, your rPi temperature_sensor looks funny. Mine is:

[temperature_sensor raspberry_pi]
sensor_type: temperature_host
min_temp: 10
max_temp: 100

Could that be the problem?

9

With deleting the RPI Sensor the problem is still the same. I dont now why the MCU Temp Sensor dont work but its not so important for me. Maybe a Klipper patch in future can fix it.

10

Function-wise both are treat equal. As “configuration policy” the colon is preferred

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11

WRT to the H7 MCU temperature, there seem to be some discussions in various pull requests, e.g.

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13

The solution is to change two files, wich @Sineos found on GitHub:

Here are the two files if anyone need it:
STM32H7_MCU_FIX.zip (4.7 KB)
One file is located in /home/pi/klipper/src/stm32 and the other one in /home/pi/klipper/klippy/extras.

Thanks for your help! :slight_smile:

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