stm32: add USB driver.

embassy-stm32/Cargo.toml

@@ -37,6 +37,7 @@ embassy = { version = "0.1.0", path = "../embassy" }
 embassy-macros = { version = "0.1.0", path = "../embassy-macros", features = ["stm32"] }
 embassy-hal-common = {version = "0.1.0", path = "../embassy-hal-common" }
 embassy-net = { version = "0.1.0", path = "../embassy-net", optional = true }
+embassy-usb = {version = "0.1.0", path = "../embassy-usb", optional = true }
 
 embedded-hal-02 = { package = "embedded-hal", version = "0.2.6", features = ["unproven"] }
 embedded-hal-1 = { package = "embedded-hal", version = "1.0.0-alpha.8", optional = true}
@@ -71,7 +72,7 @@ quote = "1.0.15"
 stm32-metapac = { version = "0.1.0", path = "../stm32-metapac", default-features = false, features = ["metadata"]}
 
 [features]
-defmt = ["dep:defmt", "embassy/defmt", "embedded-io?/defmt" ]
+defmt = ["dep:defmt", "embassy/defmt", "embedded-io?/defmt", "embassy-usb?/defmt"]
 sdmmc-rs = ["embedded-sdmmc"]
 net = ["embassy-net" ]
 memory-x = ["stm32-metapac/memory-x"]
@@ -90,7 +91,7 @@ time-driver-tim12 = ["_time-driver"]
 time-driver-tim15 = ["_time-driver"]
 
 # Enable nightly-only features
-nightly = ["embassy/nightly", "embedded-hal-1", "embedded-hal-async", "embedded-storage-async", "dep:embedded-io"]
+nightly = ["embassy/nightly", "embedded-hal-1", "embedded-hal-async", "embedded-storage-async", "dep:embedded-io", "dep:embassy-usb"]
 
 # Reexport stm32-metapac at `embassy_stm32::pac`.
 # This is unstable because semver-minor (non-breaking) releases of embassy-stm32 may major-bump (breaking) the stm32-metapac version.

embassy-stm32/build.rs

@@ -279,6 +279,8 @@ fn main() {
         (("dcmi", "HSYNC"), quote!(crate::dcmi::HSyncPin)),
         (("dcmi", "VSYNC"), quote!(crate::dcmi::VSyncPin)),
         (("dcmi", "PIXCLK"), quote!(crate::dcmi::PixClkPin)),
+        (("usb", "DP"), quote!(crate::usb::DpPin)),
+        (("usb", "DM"), quote!(crate::usb::DmPin)),
         (("otgfs", "DP"), quote!(crate::usb_otg::DpPin)),
         (("otgfs", "DM"), quote!(crate::usb_otg::DmPin)),
         (("otghs", "DP"), quote!(crate::usb_otg::DpPin)),

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;
+        }
+    };
+);