fix: transfer options

embassy-stm32/src/dma/gpdma/mod.rs

@@ -283,6 +283,9 @@ impl AnyChannel {
         state.lli_state.transfer_count.store(0, Ordering::Relaxed)
     }
 
+    /// Configure a linked-list transfer.
+    ///
+    /// Transfer options apply only to the base register transfer, not the linked-list items.
     unsafe fn configure_linked_list<const ITEM_COUNT: usize>(
         &self,
         table: &Table<ITEM_COUNT>,

embassy-stm32/src/dma/gpdma/ringbuffered.rs

@@ -69,6 +69,8 @@ pub struct ReadableRingBuffer<'a, W: Word> {
 
 impl<'a, W: Word> ReadableRingBuffer<'a, W> {
     /// Create a new ring buffer.
+    ///
+    /// Transfer options are applied to the individual linked list items.
     pub unsafe fn new(
         channel: impl Peripheral<P = impl Channel> + 'a,
         request: Request,
@@ -220,6 +222,8 @@ pub struct WritableRingBuffer<'a, W: Word> {
 
 impl<'a, W: Word> WritableRingBuffer<'a, W> {
     /// Create a new ring buffer.
+    ///
+    /// Transfer options are applied to the individual linked list items.
     pub unsafe fn new(
         channel: impl Peripheral<P = impl Channel> + 'a,
         request: Request,
@@ -279,7 +283,7 @@ impl<'a, W: Word> WritableRingBuffer<'a, W> {
             self.channel.configure_linked_list(
                 &self.table,
                 TransferOptions {
-                    half_transfer_ir: true,
+                    half_transfer_ir: false,
                     complete_transfer_ir: true,
                     ..Default::default()
                 },