stm32/i2c: use one static per instance instead of an array.

embassy-stm32/src/i2c/mod.rs

@@ -21,9 +21,10 @@ pub enum Error {
 }
 
 pub(crate) mod sealed {
+    use super::*;
     pub trait Instance: crate::rcc::RccPeripheral {
         fn regs() -> crate::pac::i2c::I2c;
-        fn state_number() -> usize;
+        fn state() -> &'static State;
     }
 }
 
@@ -36,24 +37,6 @@ pin_trait!(SdaPin, Instance);
 dma_trait!(RxDma, Instance);
 dma_trait!(TxDma, Instance);
 
-macro_rules! i2c_state {
-    (I2C1) => {
-        0
-    };
-    (I2C2) => {
-        1
-    };
-    (I2C3) => {
-        2
-    };
-    (I2C4) => {
-        3
-    };
-    (I2C5) => {
-        4
-    };
-}
-
 crate::pac::interrupts!(
     ($inst:ident, i2c, $block:ident, EV, $irq:ident) => {
         impl sealed::Instance for peripherals::$inst {
@@ -61,8 +44,9 @@ crate::pac::interrupts!(
                 crate::pac::$inst
             }
 
-            fn state_number() -> usize {
-                i2c_state!($inst)
+            fn state() -> &'static State {
+                static STATE: State = State::new();
+                &STATE
             }
         }