stm32/usart_v1: implement tx

embassy-stm32/src/usart/mod.rs

@@ -0,0 +1,75 @@
+#![macro_use]
+
+#[cfg_attr(feature = "_usart_v1", path = "usart_v1.rs")]
+#[cfg_attr(feature = "_usart_v2", path = "usart_v2.rs")]
+mod usart;
+
+pub use usart::*;
+
+use crate::gpio::Pin;
+use crate::pac::usart::Usart;
+
+/// Serial error
+#[derive(Debug, Eq, PartialEq, Copy, Clone)]
+#[non_exhaustive]
+pub enum Error {
+    /// Framing error
+    Framing,
+    /// Noise error
+    Noise,
+    /// RX buffer overrun
+    Overrun,
+    /// Parity check error
+    Parity,
+}
+
+pub(crate) mod sealed {
+    use super::*;
+
+    pub trait Instance {
+        fn regs(&self) -> Usart;
+    }
+    pub trait RxPin<T: Instance>: Pin {
+        fn af_num(&self) -> u8;
+    }
+    pub trait TxPin<T: Instance>: Pin {
+        fn af_num(&self) -> u8;
+    }
+    pub trait CtsPin<T: Instance>: Pin {
+        fn af_num(&self) -> u8;
+    }
+    pub trait RtsPin<T: Instance>: Pin {
+        fn af_num(&self) -> u8;
+    }
+    pub trait CkPin<T: Instance>: Pin {
+        fn af_num(&self) -> u8;
+    }
+}
+pub trait Instance: sealed::Instance {}
+pub trait RxPin<T: Instance>: sealed::RxPin<T> {}
+pub trait TxPin<T: Instance>: sealed::TxPin<T> {}
+pub trait CtsPin<T: Instance>: sealed::CtsPin<T> {}
+pub trait RtsPin<T: Instance>: sealed::RtsPin<T> {}
+pub trait CkPin<T: Instance>: sealed::CkPin<T> {}
+
+macro_rules! impl_usart {
+    ($inst:ident) => {
+        impl crate::usart::sealed::Instance for peripherals::$inst {
+            fn regs(&self) -> crate::pac::usart::Usart {
+                crate::pac::$inst
+            }
+        }
+        impl crate::usart::Instance for peripherals::$inst {}
+    };
+}
+
+macro_rules! impl_usart_pin {
+    ($inst:ident, $func:ident, $pin:ident, $af:expr) => {
+        impl crate::usart::sealed::$func<peripherals::$inst> for peripherals::$pin {
+            fn af_num(&self) -> u8 {
+                $af
+            }
+        }
+        impl crate::usart::$func<peripherals::$inst> for peripherals::$pin {}
+    };
+}