Merge exti macros into one and use simpler recursion

embassy-stm32/gen.py

@@ -242,7 +242,6 @@ for chip in chips.values():
                     use super::*;
 
                     impl_exti_irq!({','.join(exti_interrupts)});
-                    impl_exti_init!({','.join(exti_interrupts)});
                 }}
             }}
             mod interrupt_vector {{

embassy-stm32/src/exti.rs

@@ -215,29 +215,19 @@ impl_exti!(EXTI14, 14);
 impl_exti!(EXTI15, 15);
 
 macro_rules! impl_exti_irq {
-    ($e:ident) => {
+    ($($e:ident),+) => {
+        /// safety: must be called only once
+        pub(crate) unsafe fn init() {
+            $(
+                crate::interrupt::$e::steal().enable();
+            )+
+        }
+
+        $(
             #[interrupt]
             unsafe fn $e() {
                 crate::exti::on_irq()
             }
-    };
-
-    ($e:ident, $($es:ident),+) => {
-        impl_exti_irq! { $e }
-        impl_exti_irq! { $($es),+ }
-    };
-}
-
-macro_rules! impl_exti_init {
-    ($e:ident) => {
-        crate::interrupt::$e::steal().enable();
-    };
-
-    ($e:ident, $($es:ident),+) => {
-        /// safety: must be called only once
-        pub(crate) unsafe fn init() {
-            impl_exti_init! { $e }
-            impl_exti_init! { $($es),+ }
-        }
+        )+
     };
 }