test: continuous transfer is locking dma

Author: AstrickHarren

hil-test/tests/embassy_interrupt_spi_dma.rs

@@ -62,19 +62,19 @@ async fn interrupt_driven_task(i2s_tx: esp_hal::i2s::master::I2s<'static, Blocki
     use esp_hal::{dma::DmaTxStreamBuf, dma_buffers_chunk_size};
     let (_, _, tx_buffer, tx_descriptors) = dma_buffers_chunk_size!(128, 128, 128 / 3);
 
-    let i2s_tx = i2s_tx.into_async().i2s_tx.build();
-    let mut transfer = i2s_tx
-        .write(DmaTxStreamBuf::new(tx_descriptors, tx_buffer).unwrap())
-        .unwrap();
+    let mut i2s_tx = i2s_tx.into_async().i2s_tx.build();
+    let mut buf = DmaTxStreamBuf::new(tx_descriptors, tx_buffer).unwrap();
 
     loop {
         let mut buffer: [u8; 8] = [0; 8];
 
         INTERRUPT_TASK_WORKING.store(true, portable_atomic::Ordering::Relaxed);
+        let mut transfer = i2s_tx.write(buf).unwrap();
         while transfer.available_bytes() == 0 {
             transfer.wait_for_available().await.unwrap();
         }
         transfer.push(&mut buffer);
+        (i2s_tx, buf) = transfer.stop();
         INTERRUPT_TASK_WORKING.store(false, portable_atomic::Ordering::Relaxed);
 
         if STOP_INTERRUPT_TASK.load(portable_atomic::Ordering::Relaxed) {