fix(stm32): Fix write buffer lifetime for repeated writes

4 files changed, 8 insertions, 11 deletions

diff --git a/embassy-stm32/src/dma/bdma.rs b/embassy-stm32/src/dma/bdma.rs
index e6ce05b7b..7da22ec12 100644
--- a/embassy-stm32/src/dma/bdma.rs
+++ b/embassy-stm32/src/dma/bdma.rs
@@ -78,8 +78,7 @@ foreach_dma_channel! {
                 );
             }
 
-            unsafe fn start_write_repeated<W: Word>(&mut self, _request: Request, repeated: W, count: usize, reg_addr: *mut W, options: TransferOptions) {
-                let buf = [repeated];
+            unsafe fn start_write_repeated<W: Word>(&mut self, _request: Request, repeated: &[W; 1], count: usize, reg_addr: *mut W, options: TransferOptions) {
                 low_level_api::start_transfer(
                     pac::$dma_peri,
                     $channel_num,
@@ -87,7 +86,7 @@ foreach_dma_channel! {
                     _request,
                     vals::Dir::FROMMEMORY,
                     reg_addr as *const u32,
-                    buf.as_ptr() as *mut u32,
+                    repeated.as_ptr() as *mut u32,
                     count,
                     false,
                     vals::Size::from(W::bits()),
diff --git a/embassy-stm32/src/dma/dma.rs b/embassy-stm32/src/dma/dma.rs
index 97a3df088..45a38dda4 100644
--- a/embassy-stm32/src/dma/dma.rs
+++ b/embassy-stm32/src/dma/dma.rs
@@ -102,15 +102,14 @@ foreach_dma_channel! {
                 )
             }
 
-            unsafe fn start_write_repeated<W: Word>(&mut self, request: Request, repeated: W, count: usize, reg_addr: *mut W, options: TransferOptions) {
-                let buf = [repeated];
+            unsafe fn start_write_repeated<W: Word>(&mut self, request: Request, repeated: &[W; 1], count: usize, reg_addr: *mut W, options: TransferOptions) {
                 low_level_api::start_transfer(
                     pac::$dma_peri,
                     $channel_num,
                     request,
                     vals::Dir::MEMORYTOPERIPHERAL,
                     reg_addr as *const u32,
-                    buf.as_ptr() as *mut u32,
+                    repeated.as_ptr() as *mut u32,
                     count,
                     false,
                     vals::Size::from(W::bits()),
diff --git a/embassy-stm32/src/dma/gpdma.rs b/embassy-stm32/src/dma/gpdma.rs
index bde8c3ef3..46d8715b9 100644
--- a/embassy-stm32/src/dma/gpdma.rs
+++ b/embassy-stm32/src/dma/gpdma.rs
@@ -75,15 +75,14 @@ foreach_dma_channel! {
                 )
             }
 
-            unsafe fn start_write_repeated<W: Word>(&mut self, request: Request, repeated: W, count: usize, reg_addr: *mut W, options: TransferOptions) {
-                let buf = [repeated];
+            unsafe fn start_write_repeated<W: Word>(&mut self, request: Request, repeated: &[W; 1], count: usize, reg_addr: *mut W, options: TransferOptions) {
                 low_level_api::start_transfer(
                     pac::$dma_peri,
                     $channel_num,
                     request,
                     low_level_api::Dir::MemoryToPeripheral,
                     reg_addr as *const u32,
-                    buf.as_ptr() as *mut u32,
+                    repeated.as_ptr() as *mut u32,
                     count,
                     false,
                     W::bits(),
diff --git a/embassy-stm32/src/dma/mod.rs b/embassy-stm32/src/dma/mod.rs
index 74bce6aa9..31f55b868 100644
--- a/embassy-stm32/src/dma/mod.rs
+++ b/embassy-stm32/src/dma/mod.rs
@@ -59,7 +59,7 @@ pub(crate) mod sealed {
         unsafe fn start_write_repeated<W: super::Word>(
             &mut self,
             request: Request,
-            repeated: W,
+            repeated: &[W; 1],
             count: usize,
             reg_addr: *mut W,
             options: TransferOptions,
@@ -246,7 +246,7 @@ mod transfers {
     pub fn write_repeated<'a, W: Word>(
         channel: impl Peripheral<P = impl Channel> + 'a,
         request: Request,
-        repeated: W,
+        repeated: &[W; 1],
         count: usize,
         reg_addr: *mut W,
     ) -> impl Future<Output = ()> + 'a {