I don't know if the following is an issue specific to the implementation in this HAL, or that it is a limitation in the chip, so please let me know if this issue is in the wrong place.

For a project in which I am sending 38 kHz NEC messages on a CH32V003F4P6 dev board, I am using SimplePWM to generate a 38 kHz PWM signal and then modulate this by calling pwm.enable and pwm.disable, as follows:

    let mut pwm = SimplePwm::new(
        p.TIM1,
        None,
        None,
        None,
        Some(pin),
        Hertz::khz(38),
        CountingMode::default(),
    );
    let ch = hal::timer::Channel::Ch4;

    // Futher, in the loop to send bits:
    pwm.enable(ch);
    Delay.delay_us(563);
    pwm.disable(ch);
    if bit == 0 {
        Delay.delay_us(563);
    } else {
        Delay.delay_us(1688);
    }

When looking at an oscilloscope connected to the output pin, it looks as follows:

Is this a limitation of the CH32V003? That seems unlikely to me, given that the clock of a CH32V003 is about 1000 times higher than the signal frequency? Did I configure the PWM wrong?

I see that in the WS2811 example the signal is bitbanged in code as well, was that done for the same reason?

If any additional information is needed, please let me know :) And thanks for the great work on this project!