diff --git a/examples/stm32f4/src/bin/usart_dma.rs b/examples/stm32f4/src/bin/usart_dma.rs
index fae05b607..66ca6242b 100644
--- a/examples/stm32f4/src/bin/usart_dma.rs
+++ b/examples/stm32f4/src/bin/usart_dma.rs
@@ -23,14 +23,14 @@ async fn main_task() {
     let mut p = embassy_stm32::init(Default::default());
 
     let config = Config::default();
-    let mut usart = Uart::new(p.USART3, p.PD9, p.PD8, config, 16_000_000);
+    let mut usart = Uart::new(p.USART3, p.PD9, p.PD8, config);
 
     for n in 0u32.. {
         let mut s: String<128> = String::new();
         core::write!(&mut s, "Hello DMA World {}!\r\n", n).unwrap();
 
         usart
-            .write_dma(&mut p.DMA1_CH3, s.as_bytes())
+            .write_dma(&mut p.DMA1_3, s.as_bytes())
             .await
             .unwrap();
         info!("wrote DMA");
diff --git a/stm32-metapac/gen/src/lib.rs b/stm32-metapac/gen/src/lib.rs
index 00e122e90..1f969b3cd 100644
--- a/stm32-metapac/gen/src/lib.rs
+++ b/stm32-metapac/gen/src/lib.rs
@@ -431,13 +431,13 @@ pub fn gen(options: Options) {
                                 ]);
                             }
                             (None, Some(_)) => {
-                                println!("Unable to find enable register for {}", name)
+                                panic!("Unable to find enable register for {}", name)
                             }
                             (Some(_), None) => {
-                                println!("Unable to find reset register for {}", name)
+                                panic!("Unable to find reset register for {}", name)
                             }
                             (None, None) => {
-                                println!("Unable to find enable and reset register for {}", name)
+                                panic!("Unable to find enable and reset register for {}", name)
                             }
                         }
                     }