stm32: add USB driver.

embassy-stm32/src/lib.rs

@@ -63,6 +63,8 @@ pub mod sdmmc;
 pub mod spi;
 #[cfg(usart)]
 pub mod usart;
+#[cfg(usb)]
+pub mod usb;
 #[cfg(any(otgfs, otghs))]
 pub mod usb_otg;
 

embassy-stm32/src/usb/mod.rs

@@ -0,0 +1,36 @@
+use embassy::interrupt::Interrupt;
+
+use crate::rcc::RccPeripheral;
+
+#[cfg(feature = "nightly")]
+mod usb;
+#[cfg(feature = "nightly")]
+pub use usb::*;
+
+pub(crate) mod sealed {
+    pub trait Instance {
+        fn regs() -> crate::pac::usb::Usb;
+    }
+}
+
+pub trait Instance: sealed::Instance + RccPeripheral + 'static {
+    type Interrupt: Interrupt;
+}
+
+// Internal PHY pins
+pin_trait!(DpPin, Instance);
+pin_trait!(DmPin, Instance);
+
+foreach_interrupt!(
+    ($inst:ident, usb, $block:ident, LP, $irq:ident) => {
+        impl sealed::Instance for crate::peripherals::$inst {
+            fn regs() -> crate::pac::usb::Usb {
+                crate::pac::$inst
+            }
+        }
+
+        impl Instance for crate::peripherals::$inst {
+            type Interrupt = crate::interrupt::$irq;
+        }
+    };
+);