add dma is_running change doc

1 files changed, 1 insertions, 3 deletions

diff --git a/embassy-stm32/src/dma/dma.rs b/embassy-stm32/src/dma/dma.rs
index 0b7b60789..9c03599eb 100644
--- a/embassy-stm32/src/dma/dma.rs
+++ b/embassy-stm32/src/dma/dma.rs
@@ -404,11 +404,9 @@ impl<'a, C: Channel> Transfer<'a, C> {
     }
 
     pub fn is_running(&mut self) -> bool {
-        //let ch = self.channel.regs().st(self.channel.num());
-        //ch.cr().read().en()
-
         let ch = self.channel.regs().st(self.channel.num());
         let en = ch.cr().read().en();
+        // Check if circular mode is enabled, if so it will still be running even if tcif == 1
         let circular = ch.cr().read().circ() == vals::Circ::ENABLED;
         let tcif = STATE.complete_count[self.channel.index()].load(Ordering::Acquire) != 0;
         en && (circular || !tcif)