stm32 adc read_async: add asserts for buf len

2 files changed, 13 insertions, 6 deletions

diff --git a/embassy-stm32/src/adc/v3.rs b/embassy-stm32/src/adc/v3.rs
index 559751555..afdfc4e4c 100644
--- a/embassy-stm32/src/adc/v3.rs
+++ b/embassy-stm32/src/adc/v3.rs
@@ -262,10 +262,13 @@ impl<'d, T: Instance> Adc<'d, T> {
         &mut self,
         rx_dma: &mut impl RxDma<T>,
         sequence: impl ExactSizeIterator<Item = (&mut AnyAdcChannel<T>, SampleTime)>,
-        data: &mut [u16],
+        readings: &mut [u16],
     ) {
         assert!(sequence.len() != 0, "Asynchronous read sequence cannot be empty");
-
+        assert!(
+            sequence.len() == readings.len(),
+            "Sequence length must be equal to readings length"
+        );
         assert!(
             sequence.len() <= 16,
             "Asynchronous read sequence cannot be more than 16 in length"
@@ -357,7 +360,7 @@ impl<'d, T: Instance> Adc<'d, T> {
                 rx_dma,
                 request,
                 T::regs().dr().as_ptr() as *mut u16,
-                data,
+                readings,
                 Default::default(),
             )
         };
@@ -431,6 +434,7 @@ impl<'d, T: Instance> Adc<'d, T> {
     fn set_channel_sample_time(_ch: u8, sample_time: SampleTime) {
         cfg_if! {
             if #[cfg(any(adc_g0, adc_u0))] {
+                // On G0 and U6 all channels use the same sampling time.
                 T::regs().smpr().modify(|reg| reg.set_smp1(sample_time.into()));
             } else if #[cfg(adc_h5)] {
                 match _ch {
diff --git a/embassy-stm32/src/adc/v4.rs b/embassy-stm32/src/adc/v4.rs
index f4b62d80e..4261b9b14 100644
--- a/embassy-stm32/src/adc/v4.rs
+++ b/embassy-stm32/src/adc/v4.rs
@@ -290,10 +290,13 @@ impl<'d, T: Instance> Adc<'d, T> {
         &mut self,
         rx_dma: &mut impl RxDma<T>,
         sequence: impl ExactSizeIterator<Item = (&mut AnyAdcChannel<T>, SampleTime)>,
-        data: &mut [u16],
+        readings: &mut [u16],
     ) {
         assert!(sequence.len() != 0, "Asynchronous read sequence cannot be empty");
-
+        assert!(
+            sequence.len() == readings.len(),
+            "Sequence length must be equal to readings length"
+        );
         assert!(
             sequence.len() <= 16,
             "Asynchronous read sequence cannot be more than 16 in length"
@@ -352,7 +355,7 @@ impl<'d, T: Instance> Adc<'d, T> {
                 rx_dma,
                 request,
                 T::regs().dr().as_ptr() as *mut u16,
-                data,
+                readings,
                 Default::default(),
             )
         };