Fix SPI DMA write/read for ESP32, ESP32-S2

[bjoernQ]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
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Pull Request Details 📖

Description

On ESP32 and ESP32-S2 something like this didn't work

        embedded_hal_async::spi::SpiBus::write(&mut spi, &send_buffer)
            .await
            .unwrap();

        embedded_hal_async::spi::SpiBus::read(&mut spi, &mut buffer)
            .await
            .unwrap();

As already found in #2059 ESP32 needs some special handling to make it work.
For ESP32-S2 the solution was found by "trial and error" (also the problem there was a bit different: on S2 the first iteration worked but then it stopped working)

Testing

I added tests and you can modify embassy_spi.rs example to perform write and read in the loop like above

[plaes]

Yes, this fixes at least my issue on regular ESP32 and I can now send and receive full LoRa P2P packets..

[bugadani]

Is there a chance the new test can be merged into one of the existing ones?

[bjoernQ]

Is there a chance the new test can be merged into one of the existing ones?

Unfortunately, we need a different init - not sure embedded-test supports multiple test modules (which probably would be flashed as a separate executable anyways). There are two which in theory might be useable but then the names of the tests are awkward and misleading .... that's why I went with a separate test. Not too happy with that but the other options don't feel great

[bugadani]

Suggested change

	let _gpio = Output::new(gpio.degrade(), Level::High);
	let _gpio = Output::new(gpio, Level::High);

[JurajSadel]

Thanks!