fixed it... but... why

Author: AdinAck

examples/serial_echo_irq.rs

@@ -80,20 +80,21 @@ macro_rules! setup_uart {
 
 #[entry]
 fn main() -> ! {
-    let dp = pac::Peripherals::take().unwrap(); // might as well panic if this doesn't work
-    let cp = cortex_m::peripheral::Peripherals::take().unwrap();
-    let mut flash = dp.FLASH;
-    let mut rcc = dp.RCC.configure().sysclk(48.mhz()).freeze(&mut flash);
+    let mut delay = cortex_m::interrupt::free(|cs| {
+        let dp = pac::Peripherals::take().unwrap(); // might as well panic if this doesn't work
+        let cp = cortex_m::peripheral::Peripherals::take().unwrap();
+        let mut flash = dp.FLASH;
+        let mut rcc = dp.RCC.configure().sysclk(48.mhz()).freeze(&mut flash);
 
-    let gpioa = dp.GPIOA.split(&mut rcc);
-    let gpiob = dp.GPIOB.split(&mut rcc);
+        let gpioa = dp.GPIOA.split(&mut rcc);
+        let gpiob = dp.GPIOB.split(&mut rcc);
 
-    let mut delay = Delay::new(cp.SYST, &rcc);
-
-    cortex_m::interrupt::free(|cs| {
+        let delay = Delay::new(cp.SYST, &rcc);
         setup_uart!(cs, dp, rcc, gpioa);
 
         init_global!(cs, LED, gpiob.pb3.into_push_pull_output(cs));
+
+        delay
     });
 
     #[allow(unsafe_code)] // just this once ;)