Symmetric PWM pins and dead time

[gds3k3]

Thank you for this fantastic library. Is there any way to set up a PWM audio sink that uses two symmetric pins, and maybe introduce some dead-time between them, to drive a discrete Class D amplifier? Thanks in advance.

[pschatzmann]

I don't quite understand what you mean with symmetric pins and dead time: please elaborate...

Did you try the PWMAudioOutput class ?
For what microcontroller ?

[gds3k3]

Thank you for the quick response! The PWMAudioOutput class generates PWM on a single pin, but I'm trying to drive a discrete Class D amplifier using an H-bridge configuration. This requires two complementary PWM signals with dead time - a short period where both PWM outputs are LOW simultaneously during transitions to prevent shoot-through (both sides conducting at the same time).
Would it be possible to extend the library to support this dual-pin PWM mode with configurable dead time? This would be incredibly useful for discrete Class D amplifier designs.
Thanks again for this excellent library!

[pschatzmann]

I assume you are using an ESP32: I have added a DRAFT implementation for PWMComplementaryDriverESP32. You can use it as follows:

#include "AudioTools.h"
#include "AudioTools/CoreAudio/AudioPWM/PWMComplementaryDriverESP32.h"

PWMComplementaryDriverESP32 driver;
PWMAudioOutput out(driver);

Feel free to submit corrections if this is not working....

[gds3k3]

Wow, this is absolutely fantastic, thank you so much for this draft. The speed at which you implemented this is truly impressive. I'll report back after testing.