stm32/spi: check zero-length trasnfers.

2 files changed, 12 insertions, 0 deletions

diff --git a/tests/stm32/src/bin/spi.rs b/tests/stm32/src/bin/spi.rs
index 6151058b..b079472d 100644
--- a/tests/stm32/src/bin/spi.rs
+++ b/tests/stm32/src/bin/spi.rs
@@ -55,6 +55,12 @@ async fn main(_spawner: Spawner, p: Peripherals) {
     spi.blocking_transfer(&mut buf, &data).unwrap();
     assert_eq!(buf, data);
 
+    // Check zero-length operations, these should be noops.
+    spi.blocking_transfer::<u8>(&mut [], &[]).unwrap();
+    spi.blocking_transfer_in_place::<u8>(&mut []).unwrap();
+    spi.blocking_read::<u8>(&mut []).unwrap();
+    spi.blocking_write::<u8>(&[]).unwrap();
+
     info!("Test OK");
     cortex_m::asm::bkpt();
 }
diff --git a/tests/stm32/src/bin/spi_dma.rs b/tests/stm32/src/bin/spi_dma.rs
index 67785778..3e9521ae 100644
--- a/tests/stm32/src/bin/spi_dma.rs
+++ b/tests/stm32/src/bin/spi_dma.rs
@@ -62,6 +62,12 @@ async fn main(_spawner: Spawner, p: Peripherals) {
     spi.transfer(&mut buf, &data).await.unwrap();
     assert_eq!(buf, data);
 
+    // Check zero-length operations, these should be noops.
+    spi.transfer::<u8>(&mut [], &[]).await.unwrap();
+    spi.transfer_in_place::<u8>(&mut []).await.unwrap();
+    spi.read::<u8>(&mut []).await.unwrap();
+    spi.write::<u8>(&[]).await.unwrap();
+
     info!("Test OK");
     cortex_m::asm::bkpt();
 }