Add init fn. Initializes hw and returns Peripherals.

embassy-extras/src/macros.rs

@@ -46,18 +46,17 @@ macro_rules! peripherals {
         impl Peripherals {
             ///Returns all the peripherals *once*
             #[inline]
-            pub fn take() -> Option<Self> {
+            pub(crate) fn take() -> Self {
 
                 #[no_mangle]
                 static mut _EMBASSY_DEVICE_PERIPHERALS: bool = false;
 
-                critical_section::with(|_| {
-                    if unsafe { _EMBASSY_DEVICE_PERIPHERALS } {
-                        None
-                    } else {
-                        unsafe { _EMBASSY_DEVICE_PERIPHERALS = true };
-                        Some(unsafe { <Self as embassy::util::Steal>::steal() })
+                critical_section::with(|_| unsafe {
+                    if _EMBASSY_DEVICE_PERIPHERALS {
+                        panic!("init called more than once!")
                     }
+                    _EMBASSY_DEVICE_PERIPHERALS = true;
+                    <Self as embassy::util::Steal>::steal()
                 })
             }
         }