How to stop a circular DMA transfers in I2S?

[Mirkopoj]

I have some code that records sound from an I2S microphone and looks like this:

    let (rx_buffer, rx_descriptors, _, tx_descriptors) = dma_buffers!(16 * 4096, 0);

    let i2s = I2s::new(
        peripherals.I2S0,
        Standard::Philips,
        FORMAT,
        SAMPLE_RATE.Hz(),
        peripherals.DMA_CH1,
        rx_descriptors,
        tx_descriptors,
    )
    .with_mclk(peripherals.GPIO4)
    .into_async();

    let i2s_rx = i2s
        .i2s_rx
        .with_ws(peripherals.GPIO3)
        .with_din(peripherals.GPIO2)
        .build();

    let mut transfer = i2s_rx
        .read_dma_circular_async(rx_buffer)
        .expect("No dma read");

It then it pop data in a loop, it works great.

But now I want to stop my recording, and restart it later. I can't drop the transfer and create a new one, as it took ownership of i2s_rx. The same issue boils upwards as every step takes ownership of something else and nothing is just disposable.

I guess I could just let it run and ignore it, I not sure what pop does when it returns DmaError::Late, does it clean the buffer?

Anyways that solution wouldn't be desirable as this is a battery powered device and I would like both the mcu and the microphone to sleep and stop all I2S communication when I'm not recording.

After reading the docs I cant find what I'm missing.

Thanks in advance, and congratulations on this great protect!

[Dominaezzz]

I encountered this recently too, it appears to be an oversight. Feel free to open an issue

[Mirkopoj]

Should I write it as a bug or a feature request?

[Dominaezzz]

Feature request