[stm32] Make flash config per-family

embassy-stm32/src/flash/f3.rs

@@ -99,3 +99,12 @@ pub(crate) unsafe fn blocking_wait_ready() -> Result<(), Error> {
         }
     }
 }
+
+// safety: must be called only once at startup
+pub(crate) unsafe fn init() {
+    crate::pac::FLASH.acr().modify(|w| {
+        w.set_dcen(true);
+        w.set_icen(true);
+        w.set_prften(true);
+    });
+}

embassy-stm32/src/flash/f4.rs

@@ -174,3 +174,12 @@ pub(crate) unsafe fn blocking_wait_ready() -> Result<(), Error> {
         }
     }
 }
+
+// safety: must be called only once at startup
+pub(crate) unsafe fn init() {
+    crate::pac::FLASH.acr().modify(|w| {
+        w.set_dcen(true);
+        w.set_icen(true);
+        w.set_prften(true);
+    });
+}

embassy-stm32/src/flash/f7.rs

@@ -133,3 +133,12 @@ pub(crate) unsafe fn blocking_wait_ready() -> Result<(), Error> {
         }
     }
 }
+
+// safety: must be called only once at startup
+pub(crate) unsafe fn init() {
+    crate::pac::FLASH.acr().modify(|w| {
+        w.set_dcen(true);
+        w.set_icen(true);
+        w.set_prften(true);
+    });
+}

embassy-stm32/src/flash/h7.rs

@@ -199,3 +199,6 @@ pub(crate) unsafe fn blocking_wait_ready(bank: pac::flash::Bank) -> Result<(), E
         }
     }
 }
+
+// safety: must be called only once at startup
+pub(crate) unsafe fn init() {}

embassy-stm32/src/flash/l.rs

@@ -185,3 +185,12 @@ pub(crate) unsafe fn blocking_wait_ready() -> Result<(), Error> {
         }
     }
 }
+
+// safety: must be called only once at startup
+pub(crate) unsafe fn init() {
+    crate::pac::FLASH.acr().modify(|w| {
+        w.set_dcen(true);
+        w.set_icen(true);
+        w.set_prften(true);
+    });
+}

embassy-stm32/src/flash/mod.rs

@@ -181,9 +181,5 @@ cfg_if::cfg_if! {
 
 // safety: must be called only once at startup
 pub(crate) unsafe fn init() {
-    crate::pac::FLASH.acr().modify(|w| {
+    family::init();
-        w.set_dcen(true);
-        w.set_icen(true);
-        w.set_prften(true);
-    });
 }