stm32-metapac: change af from string to u8

stm32-metapac-gen/src/assets/metadata.rs

@@ -76,7 +76,7 @@ pub struct PeripheralRccRegister {
 pub struct PeripheralPin {
     pub pin: &'static str,
     pub signal: &'static str,
-    pub af: Option<&'static str>,
+    pub af: Option<u8>,
 }
 
 #[derive(Debug, Eq, PartialEq, Clone)]

stm32-metapac-gen/src/data.rs

@@ -87,7 +87,7 @@ pub struct PeripheralRccRegister {
 pub struct PeripheralPin {
     pub pin: String,
     pub signal: String,
-    pub af: Option<String>,
+    pub af: Option<u8>,
 }
 
 #[derive(Debug, Eq, PartialEq, Clone, Deserialize)]

stm32-metapac-gen/src/lib.rs

@@ -182,7 +182,7 @@ pub fn gen_chip(
                 row.push(pin.pin.clone());
                 row.push(pin.signal.clone());
                 if let Some(ref af) = pin.af {
-                    row.push(af.clone());
+                    row.push(format!("{}", af));
                 }
                 peripheral_pins_table.push(row);
             }