stm32: Add standard crate-wide macros for pin/dma traits, switch all drivers to use them.

embassy-stm32/src/traits.rs

@@ -0,0 +1,53 @@
+#![macro_use]
+
+macro_rules! pin_trait {
+    ($signal:ident, $instance:path) => {
+        pub trait $signal<T: $instance>: crate::gpio::Pin {
+            fn af_num(&self) -> u8;
+        }
+    };
+}
+
+macro_rules! pin_trait_impl {
+    ($signal:ident, $instance:ident, $pin:ident, $af:expr) => {
+        impl $signal<crate::peripherals::$instance> for crate::peripherals::$pin {
+            fn af_num(&self) -> u8 {
+                $af
+            }
+        }
+    };
+}
+
+// ====================
+
+macro_rules! dma_trait {
+    ($signal:ident, $instance:path) => {
+        pub trait $signal<T: $instance>: crate::dma::Channel {
+            fn request(&self) -> crate::dma::Request;
+        }
+    };
+}
+
+#[allow(unused)]
+macro_rules! dma_trait_impl {
+    // DMAMUX
+    ($signal:ident, $instance:ident, {dmamux: $dmamux:ident}, $request:expr) => {
+        impl<T> $signal<crate::peripherals::$instance> for T
+        where
+            T: crate::dma::MuxChannel<Mux = crate::dma::$dmamux>,
+        {
+            fn request(&self) -> crate::dma::Request {
+                $request
+            }
+        }
+    };
+
+    // No DMAMUX
+    ($signal:ident, $instance:ident, {channel: $channel:ident}, $request:expr) => {
+        impl $signal<crate::peripherals::$instance> for crate::peripherals::$channel {
+            fn request(&self) -> crate::dma::Request {
+                $request
+            }
+        }
+    };
+}