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bigtreetech / Octopus-Max-EZ

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[BUG] Pin PA4 (FAN2) does not support PWM? #21

Closed sargonphin closed 8 months ago

sargonphin commented 8 months ago

Hello,

Following this issue : https://github.com/MarlinFirmware/Marlin/issues/26625

The fan port FAN2 is only ON/OFF and no PWM is supported.

The board seems to have no hardware support for PWM. Is that just misconfiguration or is it missing from the board datasheet?

See linked issue for details. Any help is appreciated ^_^

ellensp commented 8 months ago

"The board seems to have no hardware support for PWM"

No just just pin PA4, the the rest of the fan pins all have hardware PWM

This is a limitation of the controller used the STM32H723ZE

sargonphin commented 8 months ago

yes sorry lol I wrote this a bit too fast

sargonphin commented 8 months ago

Fan header has no hardware PWM output. Must use software PWM. Closing the issue

Hello, we apologize for the inconvenience. 
PA4 does not have hardware PWM function and needs to be set to software simulation pwm. 
Marlin needs to open FAN_SOFT_PWM in configuration.h.

Best regards

BIQU