Cleanup stm32f4 examples

* Remove dependency on stm32f4 pac crate
* Remove unused `ZeroClock`

1 files changed, 18 insertions, 21 deletions

diff --git a/examples/stm32f4/src/bin/button.rs b/examples/stm32f4/src/bin/button.rs
index c7160d219..901fce418 100644
--- a/examples/stm32f4/src/bin/button.rs
+++ b/examples/stm32f4/src/bin/button.rs
@@ -8,35 +8,32 @@
 
 #[path = "../example_common.rs"]
 mod example_common;
+use cortex_m_rt::entry;
 use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
+use embassy_stm32::pac;
 use embedded_hal::digital::v2::{InputPin, OutputPin};
 use example_common::*;
 
-use cortex_m_rt::entry;
-use stm32f4::stm32f429 as pac;
-
 #[entry]
 fn main() -> ! {
     info!("Hello World!");
 
-    let pp = pac::Peripherals::take().unwrap();
-
-    pp.DBGMCU.cr.modify(|_, w| {
-        w.dbg_sleep().set_bit();
-        w.dbg_standby().set_bit();
-        w.dbg_stop().set_bit()
-    });
-    pp.RCC.ahb1enr.modify(|_, w| w.dma1en().enabled());
-
-    pp.RCC.ahb1enr.modify(|_, w| {
-        w.gpioaen().enabled();
-        w.gpioben().enabled();
-        w.gpiocen().enabled();
-        w.gpioden().enabled();
-        w.gpioeen().enabled();
-        w.gpiofen().enabled();
-        w
-    });
+    unsafe {
+        pac::DBGMCU.cr().modify(|w| {
+            w.set_dbg_sleep(true);
+            w.set_dbg_standby(true);
+            w.set_dbg_stop(true);
+        });
+
+        pac::RCC.ahb1enr().modify(|w| {
+            w.set_gpioaen(true);
+            w.set_gpioben(true);
+            w.set_gpiocen(true);
+            w.set_gpioden(true);
+            w.set_gpioeen(true);
+            w.set_gpiofen(true);
+        });
+    }
 
     let p = embassy_stm32::init(Default::default());