Finalize i2c v2.

embassy-stm32/src/i2c/mod.rs

@@ -0,0 +1,58 @@
+#![macro_use]
+
+#[cfg_attr(feature = "_i2c_v2", path = "v2.rs")]
+mod _version;
+pub use _version::*;
+
+pub enum Error {
+    Bus,
+    Arbitration,
+    Nack,
+}
+
+pub(crate) mod sealed {
+    use super::*;
+    use crate::gpio::Pin;
+
+    pub trait Instance {
+        fn regs() -> &'static crate::pac::i2c::I2c;
+    }
+
+    pub trait SclPin<T: Instance>: Pin {
+        fn af_num(&self) -> u8;
+    }
+
+    pub trait SdaPin<T: Instance>: Pin {
+        fn af_num(&self) -> u8;
+    }
+}
+
+pub trait Instance: sealed::Instance + 'static {}
+
+pub trait SclPin<T: Instance>: sealed::SclPin<T> + 'static {}
+
+pub trait SdaPin<T: Instance>: sealed::SdaPin<T> + 'static {}
+
+macro_rules! impl_i2c {
+    ($inst:ident) => {
+        impl crate::i2c::sealed::Instance for peripherals::$inst {
+            fn regs() -> &'static crate::pac::i2c::I2c {
+                &crate::pac::$inst
+            }
+        }
+
+        impl crate::i2c::Instance for peripherals::$inst {}
+    };
+}
+
+macro_rules! impl_i2c_pin {
+    ($inst:ident, $pin_func:ident, $pin:ident, $af:expr) => {
+        impl crate::i2c::$pin_func<peripherals::$inst> for peripherals::$pin {}
+
+        impl crate::i2c::sealed::$pin_func<peripherals::$inst> for peripherals::$pin {
+            fn af_num(&self) -> u8 {
+                $af
+            }
+        }
+    };
+}