Merge pull request #680 from jannic/fix-build-errors

Fix build errors introduced by #621

Author: jannic

rp2040-hal/src/adc.rs

@@ -713,7 +713,9 @@ impl<'a> AdcFifo<'a, u8> {
 ///
 pub struct DmaReadTarget<Word>(u32, PhantomData<Word>);
 
-impl<Word> dma::ReadTarget for DmaReadTarget<Word> {
+/// Safety: rx_address_count points to a register which is always a valid
+/// read target.
+unsafe impl<Word> dma::ReadTarget for DmaReadTarget<Word> {
     type ReceivedWord = Word;
 
     fn rx_treq() -> Option<u8> {

rp2040-hal/src/pwm/mod.rs

@@ -938,7 +938,9 @@ impl Default for TopFormat {
 
 unsafe impl Word for TopFormat {}
 
-impl<S: SliceId, M: ValidSliceMode<S>> WriteTarget for SliceDmaWriteCc<S, M> {
+/// Safety: tx_address_count points to a register which is always a valid
+/// write target.
+unsafe impl<S: SliceId, M: ValidSliceMode<S>> WriteTarget for SliceDmaWriteCc<S, M> {
     type TransmittedWord = CcFormat;
 
     fn tx_treq() -> Option<u8> {
@@ -957,7 +959,9 @@ impl<S: SliceId, M: ValidSliceMode<S>> WriteTarget for SliceDmaWriteCc<S, M> {
     }
 }
 
-impl<S: SliceId, M: ValidSliceMode<S>> WriteTarget for SliceDmaWriteTop<S, M> {
+/// Safety: tx_address_count points to a register which is always a valid
+/// write target.
+unsafe impl<S: SliceId, M: ValidSliceMode<S>> WriteTarget for SliceDmaWriteTop<S, M> {
     type TransmittedWord = TopFormat;
 
     fn tx_treq() -> Option<u8> {