Async-SPI on ESP32: Unexpected behavior about esp-hal

[Dominaezzz]

That's probably because the SPI driver in DMA mode doesn't disable the write side when reading is being done.

This logic here should also be done for DMA mode.

esp-hal/esp-hal/src/spi/master.rs

Lines 2997 to 3000 in 237804e

	.usr_miso()
	.bit(!is_write && !no_mosi_miso)
	.usr_mosi()
	.bit(is_write && !no_mosi_miso)

Somewhere in here.

esp-hal/esp-hal/src/spi/master.rs

Lines 2104 to 2130 in 237804e

	unsafe fn start_read_bytes_dma(
	&mut self,
	chain: &mut DescriptorChain,
	ptr: *mut u8,
	len: usize,
	rx: &mut RX,
	) -> Result<(), Error> {
	let reg_block = self.register_block();
	self.configure_datalen(len as u32 * 8);
	rx.is_done();
	self.enable_dma();
	self.update();
	reset_dma_before_load_dma_dscr(reg_block);
	self.clear_dma_interrupts();
	chain.fill_for_rx(false, ptr, len)?;
	rx.prepare_transfer_without_start(self.dma_peripheral(), chain)
	.and_then(|_| rx.start_transfer())?;
	reset_dma_before_usr_cmd(reg_block);
	reg_block.cmd().modify(|_, w| w.usr().set_bit());
	Ok(())
	}