fix: unneeded mutability

1 files changed, 1 insertions, 1 deletions

diff --git a/embassy-stm32/src/i2s.rs b/embassy-stm32/src/i2s.rs
index 518371af8..ce166d718 100644
--- a/embassy-stm32/src/i2s.rs
+++ b/embassy-stm32/src/i2s.rs
@@ -458,7 +458,7 @@ impl<'d, W: Word> I2S<'d, W> {
 
     /// Write data directly to the raw I2S ringbuffer.
     /// This can be used to fill the buffer before starting the DMA transfer.
-    pub async fn write_immediate(&mut self, data: &mut [W]) -> Result<(usize, usize), Error> {
+    pub async fn write_immediate(&mut self, data: &[W]) -> Result<(usize, usize), Error> {
         match &mut self.tx_ring_buffer {
             Some(ring) => Ok(ring.write_immediate(data)?),
             _ => return Err(Error::NotATransmitter),