Async SPI broken for ESP32

[bjoernQ]

Since 4ef91c5 Async-SPI is broken for ESP32

Steps to reproduce:

• connect GPIO 2 and 4
• run cargo xtask run-example examples esp32 embassy_spi

Expected:
It works as before

Actual:
transfer never returns

[bjoernQ]

(Still works for ESP32-S2)

[Dominaezzz]

I reckon this is due to the interrupts being cleared after the DMA transfer starts, I'll have time to investigate this evening and I'll add a hil test for async spi

[plaes]

Another testcase which hangs on esp32 even before commit 4ef91c5:

    let mut write_buf = &[0xaa];
    //let mut payload = &[0xd1, 0xd2, 0xd3, 0xd4];
    // Works with 1..4 bytes
    // Hangs when payload is > 4 bytes??
    let mut payload = &[0xd1, 0xd2, 0xd3, 0xd5, 0xd5];

    defmt::info!("TX... ");
    let mut ops = [Operation::Write(write_buf), Operation::Write(payload)];
    let _ = spi_dev.transaction(&mut ops).await;
    defmt::info!("...done");

[Dominaezzz]

Ah, unfortunately the HIL tests don't run on the ESP32... oh well, we'll have to settle for the example then.