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Draft: Support PWM phase shifts on ESP8266 #4165

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Draft: Support PWM phase shifts on ESP8266 #4165

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Commits on Sep 29, 2024

  1. Support PWM phase shifts on ESP8266 

    Use the phase-locked soft PWM from the Arduino core to implement the
same PWM phase management as ESP32s are using.  The soft PWM code is
vendored in, as it was previously, to add the NMI workaround from Aircoookie#4035.

Completes Aircoookie#4034
    @willmmiles
    willmmiles committed Sep 29, 2024
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  2. Slightly reduce PWM jankiness

    @willmmiles
    willmmiles committed Sep 29, 2024
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  3. Save a little RAM

    @willmmiles
    willmmiles committed Sep 29, 2024
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  4. Improve PWM on ESP8266 

    - Better phase updates without dropping samples
- Make second pin duty cycle always after first, even inverted
    @willmmiles
    willmmiles committed Sep 29, 2024
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  5. PWM: Revert always apply dead time

    @willmmiles
    willmmiles committed Sep 29, 2024
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