From 50ecb7d42b74d6bd0af91310d6d02c1a4a6531dd Mon Sep 17 00:00:00 2001
From: xoviat <xoviat@gmail.com>
Date: Mon, 29 Mar 2021 08:57:40 -0500
Subject: [PATCH] cleanup and consolidate peripherals macro

---
 embassy-extras/src/macros.rs | 39 ++++++++++++++++++++++++++++++++++++
 embassy-stm32/src/lib.rs     | 35 ++------------------------------
 2 files changed, 41 insertions(+), 33 deletions(-)

diff --git a/embassy-extras/src/macros.rs b/embassy-extras/src/macros.rs
index 9110f225..e57b89ec 100644
--- a/embassy-extras/src/macros.rs
+++ b/embassy-extras/src/macros.rs
@@ -105,3 +105,42 @@ macro_rules! impl_unborrow {
         }
     };
 }
+
+#[macro_export]
+macro_rules! std_peripherals {
+    ($($(#[$cfg:meta])? $name:ident),*$(,)?) => {
+        #[doc = r"All the peripherals"]
+        #[allow(non_snake_case)]
+        pub struct Peripherals {
+            $(
+                $(#[$cfg])?
+                pub $name: pac::$name,
+            )+
+        }
+
+        static mut GLOBAL_CLOCKS: Option<Clocks> = None;
+
+        impl Peripherals {
+            pub fn take() -> Option<(Peripherals, Clocks)> {
+                match unsafe {GLOBAL_CLOCKS} {
+                    Some(clocks) => {
+                        let dp = unsafe { pac::Peripherals::steal() };
+                        let peripherals = Peripherals {
+                            $(
+                                $(#[$cfg])?
+                                $name: dp.$name,
+                            )+
+                        };
+
+                        Some((peripherals, clocks))
+                    },
+                    None => None,
+                }
+            }
+
+            pub unsafe fn set_peripherals(clocks: Clocks) {
+                GLOBAL_CLOCKS.replace(clocks);
+            }
+        }
+    };
+}
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index 40e6093d..3cef287c 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -100,39 +100,8 @@ use core::option::Option;
 use hal::prelude::*;
 use hal::rcc::Clocks;
 
-macro_rules! peripherals {
-    ($($PER:ident,)+) => {
-        #[doc = r"All the peripherals"]
-        #[allow(non_snake_case)]
-        pub struct Peripherals {
-            $(
-                pub $PER: pac::$PER,
-            )+
-        }
-
-        static mut GLOBAL_PERIPHERALS: Option<(Peripherals, Clocks)> = None;
-
-        impl Peripherals {
-            pub fn take() -> Option<(Peripherals, Clocks)> {
-                unsafe { GLOBAL_PERIPHERALS.take() }
-            }
-
-            pub unsafe fn set_peripherals(clocks: Clocks) {
-                let dp = pac::Peripherals::steal();
-                let peripherals = Peripherals {
-                    $(
-                        $PER: dp.$PER,
-                    )+
-                };
-
-                GLOBAL_PERIPHERALS.replace((peripherals, clocks));
-            }
-        }
-    };
-}
-
 #[cfg(feature = "stm32f446")]
-peripherals! {
+embassy_extras::std_peripherals! {
     DCMI,
     FMC,
     DBGMCU,
@@ -211,7 +180,7 @@ peripherals! {
 }
 
 #[cfg(feature = "stm32f405")]
-peripherals! {
+embassy_extras::std_peripherals! {
     RNG,
     DCMI,
     FSMC,