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🩹 Software PWM requirements
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// Use software PWM to drive the fan, as for the heaters. This uses a very low frequency
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// which is not as annoying as with the hardware PWM. On the other hand, if this frequency
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// is too low, you should also increment SOFT_PWM_SCALE.
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//#define FAN_SOFT_PWM
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#define FAN_SOFT_PWM
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// Incrementing this by 1 will double the software PWM frequency,
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// affecting heaters, and the fan if FAN_SOFT_PWM is enabled.
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